text: /*
     +----------------------------------------------------------------------+
     | Copyright (c) The PHP Group                                          |
     +----------------------------------------------------------------------+
     | This source file is subject to version 3.01 of the PHP license,      |
     | that is bundled with this package in the file LICENSE, and is        |
     | available through the world-wide-web at the following url:           |
     | http://www.php.net/license/3_01.txt                                  |
     | If you did not receive a copy of the PHP license and are unable to   |
     | obtain it through the world-wide-web, please send a note to          |
     | license@php.net so we can mail you a copy immediately.               |
     +----------------------------------------------------------------------+
     | Authors: Frank Denis <jedisct1@php.net>                              |
     +----------------------------------------------------------------------+
  */
  
  #ifdef HAVE_CONFIG_H
  # include "config.h"
  #endif
  
  #include "php.h"
  #include "php_ini.h"
  #include "ext/standard/info.h"
  #include "php_libsodium.h"
  #include "zend_exceptions.h"
  
  #include <sodium.h>
  #include <stdint.h>
  #include <string.h>
  
  #define PHP_SODIUM_ZSTR_TRUNCATE(zs, len) do { ZSTR_LEN(zs) = (len); } while(0)
  
  static zend_class_entry *sodium_exception_ce;
  
  ZEND_BEGIN_ARG_INFO_EX(AI_None, 0, 0, 0)
  ZEND_END_ARG_INFO()
  
  ZEND_BEGIN_ARG_INFO_EX(AI_FirstArgByReference, 0, 0, 1)
  	ZEND_ARG_INFO(1, reference)
  ZEND_END_ARG_INFO()
  
  ZEND_BEGIN_ARG_INFO_EX(AI_String, 0, 0, 1)
  	ZEND_ARG_INFO(0, string)
  ZEND_END_ARG_INFO()
  
  ZEND_BEGIN_ARG_INFO_EX(AI_StringRef, 0, 0, 1)
  	ZEND_ARG_INFO(1, string)
  ZEND_END_ARG_INFO()
  
  ZEND_BEGIN_ARG_INFO_EX(AI_TwoStrings, 0, 0, 2)
  	ZEND_ARG_INFO(0, string_1)
  	ZEND_ARG_INFO(0, string_2)
  ZEND_END_ARG_INFO()
  
  ZEND_BEGIN_ARG_INFO_EX(AI_StringAndMaybeString, 0, 0, 1)
  	ZEND_ARG_INFO(0, string_1)
  	/* optional */
  	ZEND_ARG_INFO(0, string_2)
  ZEND_END_ARG_INFO()
  
  ZEND_BEGIN_ARG_INFO_EX(AI_StringAndIdAndMaybeString, 0, 0, 2)
  	ZEND_ARG_INFO(0, string_1)
  	ZEND_ARG_INFO(0, id)
  	/* optional */
  	ZEND_ARG_INFO(0, string_2)
  ZEND_END_ARG_INFO()
  
  ZEND_BEGIN_ARG_INFO_EX(AI_StringRefAndString, 0, 0, 2)
  	ZEND_ARG_INFO(1, string_1)
  	ZEND_ARG_INFO(0, string_2)
  ZEND_END_ARG_INFO()
  
  ZEND_BEGIN_ARG_INFO_EX(AI_StringAndKey, 0, 0, 2)
  	ZEND_ARG_INFO(0, string)
  	ZEND_ARG_INFO(0, key)
  ZEND_END_ARG_INFO()
  
  ZEND_BEGIN_ARG_INFO_EX(AI_StringAndLength, 0, 0, 2)
  	ZEND_ARG_INFO(0, string)
  	ZEND_ARG_INFO(0, length)
  ZEND_END_ARG_INFO()
  
  ZEND_BEGIN_ARG_INFO_EX(AI_StringAndId, 0, 0, 2)
  	ZEND_ARG_INFO(0, string)
  	ZEND_ARG_INFO(0, id)
  ZEND_END_ARG_INFO()
  
  ZEND_BEGIN_ARG_INFO_EX(AI_StringAndKeyPair, 0, 0, 2)
  	ZEND_ARG_INFO(0, string)
  	ZEND_ARG_INFO(0, keypair)
  ZEND_END_ARG_INFO()
  
  ZEND_BEGIN_ARG_INFO_EX(AI_SignatureAndStringAndKey, 0, 0, 3)
  	ZEND_ARG_INFO(0, signature)
  	ZEND_ARG_INFO(0, string)
  	ZEND_ARG_INFO(0, key)
  ZEND_END_ARG_INFO()
  
  ZEND_BEGIN_ARG_INFO_EX(AI_Key, 0, 0, 1)
  	ZEND_ARG_INFO(0, key)
  ZEND_END_ARG_INFO()
  
  ZEND_BEGIN_ARG_INFO_EX(AI_SecretKeyAndPublicKey, 0, 0, 2)
  	ZEND_ARG_INFO(0, secret_key)
  	ZEND_ARG_INFO(0, public_key)
  ZEND_END_ARG_INFO()
  
  ZEND_BEGIN_ARG_INFO_EX(AI_LengthAndNonceAndKey, 0, 0, 3)
  	ZEND_ARG_INFO(0, length)
  	ZEND_ARG_INFO(0, nonce)
  	ZEND_ARG_INFO(0, key)
  ZEND_END_ARG_INFO()
  
  ZEND_BEGIN_ARG_INFO_EX(AI_StringAndNonceAndKey, 0, 0, 3)
  	ZEND_ARG_INFO(0, string)
  	ZEND_ARG_INFO(0, nonce)
  	ZEND_ARG_INFO(0, key)
  ZEND_END_ARG_INFO()
  
  ZEND_BEGIN_ARG_INFO_EX(AI_StringAndNonceAndKeyPair, 0, 0, 3)
  	ZEND_ARG_INFO(0, string)
  	ZEND_ARG_INFO(0, nonce)
  	ZEND_ARG_INFO(0, key)
  ZEND_END_ARG_INFO()
  
  ZEND_BEGIN_ARG_INFO_EX(AI_StringAndMaybeKeyAndLength, 0, 0, 1)
  	ZEND_ARG_INFO(0, string)
  	/* optional */
  	ZEND_ARG_INFO(0, key)
  	ZEND_ARG_INFO(0, length)
  ZEND_END_ARG_INFO()
  
  ZEND_BEGIN_ARG_INFO_EX(AI_LengthAndPasswordAndSaltAndOpsLimitAndMemLimit, 0, 0, 5)
  	ZEND_ARG_INFO(0, length)
  	ZEND_ARG_INFO(0, password)
  	ZEND_ARG_INFO(0, salt)
  	ZEND_ARG_INFO(0, opslimit)
  	ZEND_ARG_INFO(0, memlimit)
  	/* optional */
  	ZEND_ARG_INFO(0, alg)
  ZEND_END_ARG_INFO()
  
  ZEND_BEGIN_ARG_INFO_EX(AI_PasswordAndOpsLimitAndMemLimit, 0, 0, 3)
  	ZEND_ARG_INFO(0, password)
  	ZEND_ARG_INFO(0, opslimit)
  	ZEND_ARG_INFO(0, memlimit)
  ZEND_END_ARG_INFO()
  
  ZEND_BEGIN_ARG_INFO_EX(AI_HashAndPassword, 0, 0, 2)
  	ZEND_ARG_INFO(0, hash)
  	ZEND_ARG_INFO(0, password)
  ZEND_END_ARG_INFO()
  
  ZEND_BEGIN_ARG_INFO_EX(AI_StringAndADAndNonceAndKey, 0, 0, 4)
  	ZEND_ARG_INFO(0, string)
  	ZEND_ARG_INFO(0, ad)
  	ZEND_ARG_INFO(0, nonce)
  	ZEND_ARG_INFO(0, key)
  ZEND_END_ARG_INFO()
  
  ZEND_BEGIN_ARG_INFO_EX(AI_StateByReference, 0, 0, 1)
  	ZEND_ARG_INFO(1, state)
  ZEND_END_ARG_INFO()
  
  ZEND_BEGIN_ARG_INFO_EX(AI_StateByReferenceAndStringAndMaybeStringAndLong, 0, 0, 2)
  	ZEND_ARG_INFO(1, state)
  	ZEND_ARG_INFO(0, string)
  	/* optional */
  	ZEND_ARG_INFO(0, string)
  	ZEND_ARG_INFO(0, long)
  ZEND_END_ARG_INFO()
  
  ZEND_BEGIN_ARG_INFO_EX(AI_StateByReferenceAndStringAndMaybeString, 0, 0, 2)
  	ZEND_ARG_INFO(1, state)
  	ZEND_ARG_INFO(0, string)
  	/* optional */
  	ZEND_ARG_INFO(0, string)
  ZEND_END_ARG_INFO()
  
  ZEND_BEGIN_ARG_INFO_EX(AI_StateByReferenceAndMaybeLength, 0, 0, 1)
  	ZEND_ARG_INFO(1, state)
  	/* optional */
  	ZEND_ARG_INFO(0, length)
  ZEND_END_ARG_INFO()
  
  ZEND_BEGIN_ARG_INFO_EX(AI_StateByReferenceAndString, 0, 0, 2)
  	ZEND_ARG_INFO(1, state)
  	ZEND_ARG_INFO(0, string)
  ZEND_END_ARG_INFO()
  
  ZEND_BEGIN_ARG_INFO_EX(AI_MaybeKeyAndLength, 0, 0, 0)
  	/* optional */
  	ZEND_ARG_INFO(0, key)
  	ZEND_ARG_INFO(0, length)
  ZEND_END_ARG_INFO()
  
  ZEND_BEGIN_ARG_INFO_EX(AI_KXClientSession, 0, 0, 2)
  	ZEND_ARG_INFO(0, client_keypair)
  	ZEND_ARG_INFO(0, server_key)
  ZEND_END_ARG_INFO()
  
  ZEND_BEGIN_ARG_INFO_EX(AI_KXServerSession, 0, 0, 2)
  	ZEND_ARG_INFO(0, server_keypair)
  	ZEND_ARG_INFO(0, client_key)
  ZEND_END_ARG_INFO()
  
  ZEND_BEGIN_ARG_INFO_EX(AI_KDF, 0, 0, 4)
  	ZEND_ARG_INFO(0, subkey_len)
  	ZEND_ARG_INFO(0, subkey_id)
  	ZEND_ARG_INFO(0, context)
  	ZEND_ARG_INFO(0, key)
  ZEND_END_ARG_INFO()
  
  #if (defined(__amd64) || defined(__amd64__) || defined(__x86_64__) || defined(__i386__) || \
  	 defined(_M_AMD64) || defined(_M_IX86))
  # define HAVE_AESGCM 1
  #endif
  
  #ifndef crypto_aead_chacha20poly1305_IETF_KEYBYTES
  # define crypto_aead_chacha20poly1305_IETF_KEYBYTES crypto_aead_chacha20poly1305_KEYBYTES
  #endif
  #ifndef crypto_aead_chacha20poly1305_IETF_NSECBYTES
  # define crypto_aead_chacha20poly1305_IETF_NSECBYTES crypto_aead_chacha20poly1305_NSECBYTES
  #endif
  #ifndef crypto_aead_chacha20poly1305_IETF_ABYTES
  # define crypto_aead_chacha20poly1305_IETF_ABYTES crypto_aead_chacha20poly1305_ABYTES
  #endif
  
  #if defined(crypto_secretstream_xchacha20poly1305_ABYTES) && SODIUM_LIBRARY_VERSION_MAJOR < 10
  # undef crypto_secretstream_xchacha20poly1305_ABYTES
  #endif
  
  #ifndef crypto_pwhash_OPSLIMIT_MIN
  # define crypto_pwhash_OPSLIMIT_MIN crypto_pwhash_OPSLIMIT_INTERACTIVE
  #endif
  #ifndef crypto_pwhash_MEMLIMIT_MIN
  # define crypto_pwhash_MEMLIMIT_MIN crypto_pwhash_MEMLIMIT_INTERACTIVE
  #endif
  #ifndef crypto_pwhash_scryptsalsa208sha256_OPSLIMIT_MIN
  # define crypto_pwhash_scryptsalsa208sha256_OPSLIMIT_MIN crypto_pwhash_scryptsalsa208sha256_OPSLIMIT_INTERACTIVE
  #endif
  #ifndef crypto_pwhash_scryptsalsa208sha256_MEMLIMIT_MIN
  # define crypto_pwhash_scryptsalsa208sha256_MEMLIMIT_MIN crypto_pwhash_scryptsalsa208sha256_MEMLIMIT_INTERACTIVE
  #endif
  
  static const zend_function_entry sodium_functions[] = {
  	PHP_FE(sodium_crypto_aead_aes256gcm_is_available, AI_None)
  #ifdef HAVE_AESGCM
  	PHP_FE(sodium_crypto_aead_aes256gcm_decrypt, AI_StringAndADAndNonceAndKey)
  	PHP_FE(sodium_crypto_aead_aes256gcm_encrypt, AI_StringAndADAndNonceAndKey)
  	PHP_FE(sodium_crypto_aead_aes256gcm_keygen, AI_None)
  #endif
  	PHP_FE(sodium_crypto_aead_chacha20poly1305_decrypt, AI_StringAndADAndNonceAndKey)
  	PHP_FE(sodium_crypto_aead_chacha20poly1305_encrypt, AI_StringAndADAndNonceAndKey)
  	PHP_FE(sodium_crypto_aead_chacha20poly1305_keygen, AI_None)
  	PHP_FE(sodium_crypto_aead_chacha20poly1305_ietf_decrypt, AI_StringAndADAndNonceAndKey)
  	PHP_FE(sodium_crypto_aead_chacha20poly1305_ietf_encrypt, AI_StringAndADAndNonceAndKey)
  	PHP_FE(sodium_crypto_aead_chacha20poly1305_ietf_keygen, AI_None)
  #ifdef crypto_aead_xchacha20poly1305_IETF_NPUBBYTES
  	PHP_FE(sodium_crypto_aead_xchacha20poly1305_ietf_decrypt, AI_StringAndADAndNonceAndKey)
  	PHP_FE(sodium_crypto_aead_xchacha20poly1305_ietf_keygen, AI_None)
  	PHP_FE(sodium_crypto_aead_xchacha20poly1305_ietf_encrypt, AI_StringAndADAndNonceAndKey)
  #endif
  	PHP_FE(sodium_crypto_auth, AI_StringAndKey)
  	PHP_FE(sodium_crypto_auth_keygen, AI_None)
  	PHP_FE(sodium_crypto_auth_verify, AI_SignatureAndStringAndKey)
  	PHP_FE(sodium_crypto_box, AI_StringAndNonceAndKeyPair)
  	PHP_FE(sodium_crypto_box_keypair, AI_None)
  	PHP_FE(sodium_crypto_box_seed_keypair, AI_Key)
  	PHP_FE(sodium_crypto_box_keypair_from_secretkey_and_publickey, AI_SecretKeyAndPublicKey)
  	PHP_FE(sodium_crypto_box_open, AI_StringAndNonceAndKey)
  	PHP_FE(sodium_crypto_box_publickey, AI_Key)
  	PHP_FE(sodium_crypto_box_publickey_from_secretkey, AI_Key)
  	PHP_FE(sodium_crypto_box_seal, AI_StringAndKey)
  	PHP_FE(sodium_crypto_box_seal_open, AI_StringAndKey)
  	PHP_FE(sodium_crypto_box_secretkey, AI_Key)
  	PHP_FE(sodium_crypto_kx_keypair, AI_None)
  	PHP_FE(sodium_crypto_kx_publickey, AI_Key)
  	PHP_FE(sodium_crypto_kx_secretkey, AI_Key)
  	PHP_FE(sodium_crypto_kx_seed_keypair, AI_String)
  	PHP_FE(sodium_crypto_kx_client_session_keys, AI_KXClientSession)
  	PHP_FE(sodium_crypto_kx_server_session_keys, AI_KXServerSession)
  	PHP_FE(sodium_crypto_generichash, AI_StringAndMaybeKeyAndLength)
  	PHP_FE(sodium_crypto_generichash_keygen, AI_None)
  	PHP_FE(sodium_crypto_generichash_init, AI_MaybeKeyAndLength)
  	PHP_FE(sodium_crypto_generichash_update, AI_StateByReferenceAndString)
  	PHP_FE(sodium_crypto_generichash_final, AI_StateByReferenceAndMaybeLength)
  	PHP_FE(sodium_crypto_kdf_derive_from_key, AI_KDF)
  	PHP_FE(sodium_crypto_kdf_keygen, AI_None)
  #ifdef crypto_pwhash_SALTBYTES
  	PHP_FE(sodium_crypto_pwhash, AI_LengthAndPasswordAndSaltAndOpsLimitAndMemLimit)
  	PHP_FE(sodium_crypto_pwhash_str, AI_PasswordAndOpsLimitAndMemLimit)
  	PHP_FE(sodium_crypto_pwhash_str_verify, AI_HashAndPassword)
  #endif
  #if SODIUM_LIBRARY_VERSION_MAJOR > 9 || (SODIUM_LIBRARY_VERSION_MAJOR == 9 && SODIUM_LIBRARY_VERSION_MINOR >= 6)
  	PHP_FE(sodium_crypto_pwhash_str_needs_rehash, AI_PasswordAndOpsLimitAndMemLimit)
  #endif
  #ifdef crypto_pwhash_scryptsalsa208sha256_SALTBYTES
  	PHP_FE(sodium_crypto_pwhash_scryptsalsa208sha256, AI_LengthAndPasswordAndSaltAndOpsLimitAndMemLimit)
  	PHP_FE(sodium_crypto_pwhash_scryptsalsa208sha256_str, AI_PasswordAndOpsLimitAndMemLimit)
  	PHP_FE(sodium_crypto_pwhash_scryptsalsa208sha256_str_verify, AI_HashAndPassword)
  #endif
  	PHP_FE(sodium_crypto_scalarmult, AI_TwoStrings)
  	PHP_FE(sodium_crypto_secretbox, AI_StringAndNonceAndKey)
  	PHP_FE(sodium_crypto_secretbox_keygen, AI_None)
  	PHP_FE(sodium_crypto_secretbox_open, AI_StringAndNonceAndKey)
  #ifdef crypto_secretstream_xchacha20poly1305_ABYTES
  	PHP_FE(sodium_crypto_secretstream_xchacha20poly1305_keygen, AI_None)
  	PHP_FE(sodium_crypto_secretstream_xchacha20poly1305_init_push, AI_Key)
  	PHP_FE(sodium_crypto_secretstream_xchacha20poly1305_push, AI_StateByReferenceAndStringAndMaybeStringAndLong)
  	PHP_FE(sodium_crypto_secretstream_xchacha20poly1305_init_pull, AI_StringAndKey)
  	PHP_FE(sodium_crypto_secretstream_xchacha20poly1305_pull, AI_StateByReferenceAndStringAndMaybeString)
  	PHP_FE(sodium_crypto_secretstream_xchacha20poly1305_rekey, AI_StateByReference)
  #endif
  	PHP_FE(sodium_crypto_shorthash, AI_StringAndKey)
  	PHP_FE(sodium_crypto_shorthash_keygen, AI_None)
  	PHP_FE(sodium_crypto_sign, AI_StringAndKeyPair)
  	PHP_FE(sodium_crypto_sign_detached, AI_StringAndKeyPair)
  	PHP_FE(sodium_crypto_sign_ed25519_pk_to_curve25519, AI_Key)
  	PHP_FE(sodium_crypto_sign_ed25519_sk_to_curve25519, AI_Key)
  	PHP_FE(sodium_crypto_sign_keypair, AI_None)
  	PHP_FE(sodium_crypto_sign_keypair_from_secretkey_and_publickey, AI_SecretKeyAndPublicKey)
  	PHP_FE(sodium_crypto_sign_open, AI_StringAndKeyPair)
  	PHP_FE(sodium_crypto_sign_publickey, AI_Key)
  	PHP_FE(sodium_crypto_sign_secretkey, AI_Key)
  	PHP_FE(sodium_crypto_sign_publickey_from_secretkey, AI_Key)
  	PHP_FE(sodium_crypto_sign_seed_keypair, AI_Key)
  	PHP_FE(sodium_crypto_sign_verify_detached, AI_SignatureAndStringAndKey)
  	PHP_FE(sodium_crypto_stream, AI_LengthAndNonceAndKey)
  	PHP_FE(sodium_crypto_stream_keygen, AI_None)
  	PHP_FE(sodium_crypto_stream_xor, AI_StringAndNonceAndKey)
  
  	/* helpers */
  
  	PHP_FE(sodium_add, AI_StringRefAndString)
  	PHP_FE(sodium_compare, AI_TwoStrings)
  	PHP_FE(sodium_increment, AI_StringRef)
  	PHP_FE(sodium_memcmp, AI_TwoStrings)
  	PHP_FE(sodium_memzero, AI_FirstArgByReference)
  	PHP_FE(sodium_pad, AI_StringAndLength)
  	PHP_FE(sodium_unpad, AI_StringAndLength)
  
  	/* codecs */
  
  	PHP_FE(sodium_bin2hex, AI_String)
  	PHP_FE(sodium_hex2bin, AI_StringAndMaybeString)
  #ifdef sodium_base64_VARIANT_ORIGINAL
  	PHP_FE(sodium_bin2base64, AI_StringAndId)
  	PHP_FE(sodium_base642bin, AI_StringAndIdAndMaybeString)
  #endif
  
  	/* aliases */
  
  	PHP_FALIAS(sodium_crypto_scalarmult_base, sodium_crypto_box_publickey_from_secretkey, AI_TwoStrings)
  
  	PHP_FE_END
  };
  
  /* Load after the "standard" module in order to give it
   * priority in registering argon2i/argon2id password hashers.
   */
  static const zend_module_dep sodium_deps[] = {
  	ZEND_MOD_REQUIRED("standard")
  	ZEND_MOD_END
  };
  
  zend_module_entry sodium_module_entry = {
  	STANDARD_MODULE_HEADER_EX,
  	NULL,
  	sodium_deps,
  	"sodium",
  	sodium_functions,
  	PHP_MINIT(sodium),
  	PHP_MSHUTDOWN(sodium),
  	NULL,
  	NULL,
  	PHP_MINFO(sodium),
  	PHP_SODIUM_VERSION,
  	STANDARD_MODULE_PROPERTIES
  };
  /* }}} */
  
  #ifdef COMPILE_DL_SODIUM
  ZEND_GET_MODULE(sodium)
  #endif
  
  /* Remove argument information from backtrace to prevent information leaks */
  static void sodium_remove_param_values_from_backtrace(zend_object *obj) {
  	zval obj_zv, rv, *trace;
  
  	ZVAL_OBJ(&obj_zv, obj);
  	trace = zend_read_property(zend_get_exception_base(&obj_zv), &obj_zv, "trace", sizeof("trace")-1, 0, &rv);
  	if (trace && Z_TYPE_P(trace) == IS_ARRAY) {
  		zval *frame;
  		ZEND_HASH_FOREACH_VAL(Z_ARRVAL_P(trace), frame) {
  			if (Z_TYPE_P(frame) == IS_ARRAY) {
  				zval *args = zend_hash_str_find(Z_ARRVAL_P(frame), "args", sizeof("args")-1);
  				if (args) {
  					zval_ptr_dtor(args);
  					ZVAL_EMPTY_ARRAY(args);
  				}
  			}
  		} ZEND_HASH_FOREACH_END();
  	}
  }
  
  static zend_object *sodium_exception_create_object(zend_class_entry *ce) {
  	zend_object *obj = zend_ce_exception->create_object(ce);
  	sodium_remove_param_values_from_backtrace(obj);
  	return obj;
  }
  
  static void sodium_separate_string(zval *zv) {
  	ZEND_ASSERT(Z_TYPE_P(zv) == IS_STRING);
  	if (!Z_REFCOUNTED_P(zv) || Z_REFCOUNT_P(zv) > 1) {
  		zend_string *copy = zend_string_init(Z_STRVAL_P(zv), Z_STRLEN_P(zv), 0);
  		Z_TRY_DELREF_P(zv);
  		ZVAL_STR(zv, copy);
  	}
  }
  
  PHP_MINIT_FUNCTION(sodium)
  {
  	zend_class_entry ce;
  
  	if (sodium_init() < 0) {
  		zend_error(E_ERROR, "sodium_init()");
  	}
  
  	INIT_CLASS_ENTRY(ce, "SodiumException", NULL);
  	sodium_exception_ce = zend_register_internal_class_ex(&ce, zend_ce_exception);
  	sodium_exception_ce->create_object = sodium_exception_create_object;
  
  	REGISTER_STRING_CONSTANT("SODIUM_LIBRARY_VERSION",
  							 (char *) (void *) sodium_version_string(), CONST_CS | CONST_PERSISTENT);
  	REGISTER_LONG_CONSTANT("SODIUM_LIBRARY_MAJOR_VERSION",
  						   sodium_library_version_major(), CONST_CS | CONST_PERSISTENT);
  	REGISTER_LONG_CONSTANT("SODIUM_LIBRARY_MINOR_VERSION",
  						   sodium_library_version_minor(), CONST_CS | CONST_PERSISTENT);
  #ifdef HAVE_AESGCM
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_AEAD_AES256GCM_KEYBYTES",
  						   crypto_aead_aes256gcm_KEYBYTES, CONST_CS | CONST_PERSISTENT);
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_AEAD_AES256GCM_NSECBYTES",
  						   crypto_aead_aes256gcm_NSECBYTES, CONST_CS | CONST_PERSISTENT);
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_AEAD_AES256GCM_NPUBBYTES",
  						   crypto_aead_aes256gcm_NPUBBYTES, CONST_CS | CONST_PERSISTENT);
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_AEAD_AES256GCM_ABYTES",
  						   crypto_aead_aes256gcm_ABYTES, CONST_CS | CONST_PERSISTENT);
  #endif
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_AEAD_CHACHA20POLY1305_KEYBYTES",
  						   crypto_aead_chacha20poly1305_KEYBYTES, CONST_CS | CONST_PERSISTENT);
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_AEAD_CHACHA20POLY1305_NSECBYTES",
  						   crypto_aead_chacha20poly1305_NSECBYTES, CONST_CS | CONST_PERSISTENT);
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_AEAD_CHACHA20POLY1305_NPUBBYTES",
  						   crypto_aead_chacha20poly1305_NPUBBYTES, CONST_CS | CONST_PERSISTENT);
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_AEAD_CHACHA20POLY1305_ABYTES",
  						   crypto_aead_chacha20poly1305_ABYTES, CONST_CS | CONST_PERSISTENT);
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_AEAD_CHACHA20POLY1305_IETF_KEYBYTES",
  						   crypto_aead_chacha20poly1305_IETF_KEYBYTES, CONST_CS | CONST_PERSISTENT);
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_AEAD_CHACHA20POLY1305_IETF_NSECBYTES",
  						   crypto_aead_chacha20poly1305_IETF_NSECBYTES, CONST_CS | CONST_PERSISTENT);
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_AEAD_CHACHA20POLY1305_IETF_NPUBBYTES",
  						   crypto_aead_chacha20poly1305_IETF_NPUBBYTES, CONST_CS | CONST_PERSISTENT);
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_AEAD_CHACHA20POLY1305_IETF_ABYTES",
  						   crypto_aead_chacha20poly1305_IETF_ABYTES, CONST_CS | CONST_PERSISTENT);
  #ifdef crypto_aead_xchacha20poly1305_IETF_NPUBBYTES
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_AEAD_XCHACHA20POLY1305_IETF_KEYBYTES",
  						   crypto_aead_xchacha20poly1305_IETF_KEYBYTES, CONST_CS | CONST_PERSISTENT);
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_AEAD_XCHACHA20POLY1305_IETF_NSECBYTES",
  						   crypto_aead_xchacha20poly1305_IETF_NSECBYTES, CONST_CS | CONST_PERSISTENT);
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_AEAD_XCHACHA20POLY1305_IETF_NPUBBYTES",
  						   crypto_aead_xchacha20poly1305_IETF_NPUBBYTES, CONST_CS | CONST_PERSISTENT);
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_AEAD_XCHACHA20POLY1305_IETF_ABYTES",
  						   crypto_aead_xchacha20poly1305_IETF_ABYTES, CONST_CS | CONST_PERSISTENT);
  #endif
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_AUTH_BYTES",
  						   crypto_auth_BYTES, CONST_CS | CONST_PERSISTENT);
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_AUTH_KEYBYTES",
  						   crypto_auth_KEYBYTES, CONST_CS | CONST_PERSISTENT);
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_BOX_SEALBYTES",
  						   crypto_box_SEALBYTES, CONST_CS | CONST_PERSISTENT);
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_BOX_SECRETKEYBYTES",
  						   crypto_box_SECRETKEYBYTES, CONST_CS | CONST_PERSISTENT);
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_BOX_PUBLICKEYBYTES",
  						   crypto_box_PUBLICKEYBYTES, CONST_CS | CONST_PERSISTENT);
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_BOX_KEYPAIRBYTES",
  						   crypto_box_SECRETKEYBYTES + crypto_box_PUBLICKEYBYTES,
  						   CONST_CS | CONST_PERSISTENT);
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_BOX_MACBYTES",
  						   crypto_box_MACBYTES, CONST_CS | CONST_PERSISTENT);
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_BOX_NONCEBYTES",
  						   crypto_box_NONCEBYTES, CONST_CS | CONST_PERSISTENT);
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_BOX_SEEDBYTES",
  						   crypto_box_SEEDBYTES, CONST_CS | CONST_PERSISTENT);
  #ifndef crypto_kdf_BYTES_MIN
  # define crypto_kdf_BYTES_MIN 16
  # define crypto_kdf_BYTES_MAX 64
  # define crypto_kdf_CONTEXTBYTES 8
  # define crypto_kdf_KEYBYTES 32
  #endif
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_KDF_BYTES_MIN",
  						   crypto_kdf_BYTES_MIN, CONST_CS | CONST_PERSISTENT);
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_KDF_BYTES_MAX",
  						   crypto_kdf_BYTES_MAX, CONST_CS | CONST_PERSISTENT);
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_KDF_CONTEXTBYTES",
  						   crypto_kdf_CONTEXTBYTES, CONST_CS | CONST_PERSISTENT);
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_KDF_KEYBYTES",
  						   crypto_kdf_KEYBYTES, CONST_CS | CONST_PERSISTENT);
  #ifndef crypto_kx_SEEDBYTES
  # define crypto_kx_SEEDBYTES 32
  # define crypto_kx_SESSIONKEYBYTES 32
  # define crypto_kx_PUBLICKEYBYTES 32
  # define crypto_kx_SECRETKEYBYTES 32
  #endif
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_KX_SEEDBYTES",
  						   crypto_kx_SEEDBYTES, CONST_CS | CONST_PERSISTENT);
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_KX_SESSIONKEYBYTES",
  						   crypto_kx_SESSIONKEYBYTES, CONST_CS | CONST_PERSISTENT);
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_KX_PUBLICKEYBYTES",
  						   crypto_kx_PUBLICKEYBYTES, CONST_CS | CONST_PERSISTENT);
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_KX_SECRETKEYBYTES",
  						   crypto_kx_SECRETKEYBYTES, CONST_CS | CONST_PERSISTENT);
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_KX_KEYPAIRBYTES",
  						   crypto_kx_SECRETKEYBYTES + crypto_kx_PUBLICKEYBYTES,
  						   CONST_CS | CONST_PERSISTENT);
  #ifdef crypto_secretstream_xchacha20poly1305_ABYTES
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_ABYTES",
  						   crypto_secretstream_xchacha20poly1305_ABYTES,
  						   CONST_CS | CONST_PERSISTENT);
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_HEADERBYTES",
  						   crypto_secretstream_xchacha20poly1305_HEADERBYTES,
  						   CONST_CS | CONST_PERSISTENT);
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_KEYBYTES",
  						   crypto_secretstream_xchacha20poly1305_KEYBYTES,
  						   CONST_CS | CONST_PERSISTENT);
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_MESSAGEBYTES_MAX",
  						   crypto_secretstream_xchacha20poly1305_MESSAGEBYTES_MAX,
  						   CONST_CS | CONST_PERSISTENT);
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_TAG_MESSAGE",
  						   crypto_secretstream_xchacha20poly1305_TAG_MESSAGE,
  						   CONST_CS | CONST_PERSISTENT);
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_TAG_PUSH",
  						   crypto_secretstream_xchacha20poly1305_TAG_PUSH,
  						   CONST_CS | CONST_PERSISTENT);
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_TAG_REKEY",
  						   crypto_secretstream_xchacha20poly1305_TAG_REKEY,
  						   CONST_CS | CONST_PERSISTENT);
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_TAG_FINAL",
  						   crypto_secretstream_xchacha20poly1305_TAG_FINAL,
  						   CONST_CS | CONST_PERSISTENT);
  #endif
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_GENERICHASH_BYTES",
  						   crypto_generichash_BYTES, CONST_CS | CONST_PERSISTENT);
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_GENERICHASH_BYTES_MIN",
  						   crypto_generichash_BYTES_MIN, CONST_CS | CONST_PERSISTENT);
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_GENERICHASH_BYTES_MAX",
  						   crypto_generichash_BYTES_MAX, CONST_CS | CONST_PERSISTENT);
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_GENERICHASH_KEYBYTES",
  						   crypto_generichash_KEYBYTES, CONST_CS | CONST_PERSISTENT);
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_GENERICHASH_KEYBYTES_MIN",
  						   crypto_generichash_KEYBYTES_MIN, CONST_CS | CONST_PERSISTENT);
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_GENERICHASH_KEYBYTES_MAX",
  						   crypto_generichash_KEYBYTES_MAX, CONST_CS | CONST_PERSISTENT);
  #ifdef crypto_pwhash_SALTBYTES
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_PWHASH_ALG_ARGON2I13",
  						   crypto_pwhash_ALG_ARGON2I13, CONST_CS | CONST_PERSISTENT);
  # ifdef crypto_pwhash_ALG_ARGON2ID13
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_PWHASH_ALG_ARGON2ID13",
  						   crypto_pwhash_ALG_ARGON2ID13, CONST_CS | CONST_PERSISTENT);
  # endif
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_PWHASH_ALG_DEFAULT",
  						   crypto_pwhash_ALG_DEFAULT, CONST_CS | CONST_PERSISTENT);
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_PWHASH_SALTBYTES",
  						   crypto_pwhash_SALTBYTES, CONST_CS | CONST_PERSISTENT);
  	REGISTER_STRING_CONSTANT("SODIUM_CRYPTO_PWHASH_STRPREFIX",
  							 crypto_pwhash_STRPREFIX, CONST_CS | CONST_PERSISTENT);
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_PWHASH_OPSLIMIT_INTERACTIVE",
  						   crypto_pwhash_opslimit_interactive(), CONST_CS | CONST_PERSISTENT);
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_PWHASH_MEMLIMIT_INTERACTIVE",
  						   crypto_pwhash_memlimit_interactive(), CONST_CS | CONST_PERSISTENT);
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_PWHASH_OPSLIMIT_MODERATE",
  						   crypto_pwhash_opslimit_moderate(), CONST_CS | CONST_PERSISTENT);
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_PWHASH_MEMLIMIT_MODERATE",
  						   crypto_pwhash_memlimit_moderate(), CONST_CS | CONST_PERSISTENT);
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_PWHASH_OPSLIMIT_SENSITIVE",
  						   crypto_pwhash_opslimit_sensitive(), CONST_CS | CONST_PERSISTENT);
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_PWHASH_MEMLIMIT_SENSITIVE",
  						   crypto_pwhash_memlimit_sensitive(), CONST_CS | CONST_PERSISTENT);
  #endif
  #ifdef crypto_pwhash_scryptsalsa208sha256_SALTBYTES
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_PWHASH_SCRYPTSALSA208SHA256_SALTBYTES",
  						   crypto_pwhash_scryptsalsa208sha256_SALTBYTES, CONST_CS | CONST_PERSISTENT);
  	REGISTER_STRING_CONSTANT("SODIUM_CRYPTO_PWHASH_SCRYPTSALSA208SHA256_STRPREFIX",
  							 crypto_pwhash_scryptsalsa208sha256_STRPREFIX, CONST_CS | CONST_PERSISTENT);
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_PWHASH_SCRYPTSALSA208SHA256_OPSLIMIT_INTERACTIVE",
  						   crypto_pwhash_scryptsalsa208sha256_opslimit_interactive(), CONST_CS | CONST_PERSISTENT);
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_PWHASH_SCRYPTSALSA208SHA256_MEMLIMIT_INTERACTIVE",
  						   crypto_pwhash_scryptsalsa208sha256_memlimit_interactive(), CONST_CS | CONST_PERSISTENT);
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_PWHASH_SCRYPTSALSA208SHA256_OPSLIMIT_SENSITIVE",
  						   crypto_pwhash_scryptsalsa208sha256_opslimit_sensitive(), CONST_CS | CONST_PERSISTENT);
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_PWHASH_SCRYPTSALSA208SHA256_MEMLIMIT_SENSITIVE",
  						   crypto_pwhash_scryptsalsa208sha256_memlimit_sensitive(), CONST_CS | CONST_PERSISTENT);
  #endif
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_SCALARMULT_BYTES",
  						   crypto_scalarmult_BYTES, CONST_CS | CONST_PERSISTENT);
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_SCALARMULT_SCALARBYTES",
  						   crypto_scalarmult_SCALARBYTES, CONST_CS | CONST_PERSISTENT);
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_SHORTHASH_BYTES",
  						   crypto_shorthash_BYTES, CONST_CS | CONST_PERSISTENT);
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_SHORTHASH_KEYBYTES",
  						   crypto_shorthash_KEYBYTES, CONST_CS | CONST_PERSISTENT);
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_SECRETBOX_KEYBYTES",
  						   crypto_secretbox_KEYBYTES, CONST_CS | CONST_PERSISTENT);
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_SECRETBOX_MACBYTES",
  						   crypto_secretbox_MACBYTES, CONST_CS | CONST_PERSISTENT);
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_SECRETBOX_NONCEBYTES",
  						   crypto_secretbox_NONCEBYTES, CONST_CS | CONST_PERSISTENT);
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_SIGN_BYTES",
  						   crypto_sign_BYTES, CONST_CS | CONST_PERSISTENT);
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_SIGN_SEEDBYTES",
  						   crypto_sign_SEEDBYTES, CONST_CS | CONST_PERSISTENT);
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_SIGN_PUBLICKEYBYTES",
  						   crypto_sign_PUBLICKEYBYTES, CONST_CS | CONST_PERSISTENT);
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_SIGN_SECRETKEYBYTES",
  						   crypto_sign_SECRETKEYBYTES, CONST_CS | CONST_PERSISTENT);
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_SIGN_KEYPAIRBYTES",
  						   crypto_sign_SECRETKEYBYTES + crypto_sign_PUBLICKEYBYTES,
  						   CONST_CS | CONST_PERSISTENT);
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_STREAM_NONCEBYTES",
  						   crypto_stream_NONCEBYTES, CONST_CS | CONST_PERSISTENT);
  	REGISTER_LONG_CONSTANT("SODIUM_CRYPTO_STREAM_KEYBYTES",
  						   crypto_stream_KEYBYTES, CONST_CS | CONST_PERSISTENT);
  #ifdef sodium_base64_VARIANT_ORIGINAL
  	REGISTER_LONG_CONSTANT("SODIUM_BASE64_VARIANT_ORIGINAL",
  						   sodium_base64_VARIANT_ORIGINAL, CONST_CS | CONST_PERSISTENT);
  	REGISTER_LONG_CONSTANT("SODIUM_BASE64_VARIANT_ORIGINAL_NO_PADDING",
  						   sodium_base64_VARIANT_ORIGINAL_NO_PADDING, CONST_CS | CONST_PERSISTENT);
  	REGISTER_LONG_CONSTANT("SODIUM_BASE64_VARIANT_URLSAFE",
  						   sodium_base64_VARIANT_URLSAFE, CONST_CS | CONST_PERSISTENT);
  	REGISTER_LONG_CONSTANT("SODIUM_BASE64_VARIANT_URLSAFE_NO_PADDING",
  						   sodium_base64_VARIANT_URLSAFE_NO_PADDING, CONST_CS | CONST_PERSISTENT);
  #endif
  
  #if SODIUM_LIBRARY_VERSION_MAJOR > 9 || (SODIUM_LIBRARY_VERSION_MAJOR == 9 && SODIUM_LIBRARY_VERSION_MINOR >= 6)
  	if (FAILURE == PHP_MINIT(sodium_password_hash)(INIT_FUNC_ARGS_PASSTHRU)) {
  		return FAILURE;
  	}
  #endif
  
  	return SUCCESS;
  }
  
  PHP_MSHUTDOWN_FUNCTION(sodium)
  {
  	randombytes_close();
  	return SUCCESS;
  }
  
  PHP_MINFO_FUNCTION(sodium)
  {
  	php_info_print_table_start();
  	php_info_print_table_header(2, "sodium support", "enabled");
  	php_info_print_table_row(2, "libsodium headers version", SODIUM_VERSION_STRING);
  	php_info_print_table_row(2, "libsodium library version", sodium_version_string());
  	php_info_print_table_end();
  }
  
  PHP_FUNCTION(sodium_memzero)
  {
  	zval      *buf_zv;
  
  	if (zend_parse_parameters_throw(ZEND_NUM_ARGS(),
  									"z", &buf_zv) == FAILURE) {
  		sodium_remove_param_values_from_backtrace(EG(exception));
  		return;
  	}
  	ZVAL_DEREF(buf_zv);
  	if (Z_TYPE_P(buf_zv) != IS_STRING) {
  		zend_throw_exception(sodium_exception_ce, "a PHP string is required", 0);
  		return;
  	}
  	if (Z_REFCOUNTED_P(buf_zv) && Z_REFCOUNT_P(buf_zv) == 1) {
  		char *buf = Z_STRVAL(*buf_zv);
  		size_t buf_len = Z_STRLEN(*buf_zv);
  		if (buf_len > 0) {
  			sodium_memzero(buf, (size_t) buf_len);
  		}
  	}
  	convert_to_null(buf_zv);
  }
  
  PHP_FUNCTION(sodium_increment)
  {
  	zval          *val_zv;
  	unsigned char *val;
  	size_t         val_len;
  
  	if (zend_parse_parameters_throw(ZEND_NUM_ARGS(),
  									"z", &val_zv) == FAILURE) {
  		sodium_remove_param_values_from_backtrace(EG(exception));
  		return;
  	}
  	ZVAL_DEREF(val_zv);
  	if (Z_TYPE_P(val_zv) != IS_STRING) {
  		zend_throw_exception(sodium_exception_ce, "a PHP string is required", 0);
  		return;
  	}
  
  	sodium_separate_string(val_zv);
  	val = (unsigned char *) Z_STRVAL(*val_zv);
  	val_len = Z_STRLEN(*val_zv);
  	sodium_increment(val, val_len);
  }
  
  PHP_FUNCTION(sodium_add)
  {
  	zval          *val_zv;
  	unsigned char *val;
  	unsigned char *addv;
  	size_t         val_len;
  	size_t         addv_len;
  
  	if (zend_parse_parameters_throw(ZEND_NUM_ARGS(),
  									"zs", &val_zv, &addv, &addv_len) == FAILURE) {
  		sodium_remove_param_values_from_backtrace(EG(exception));
  		return;
  	}
  	ZVAL_DEREF(val_zv);
  	if (Z_TYPE_P(val_zv) != IS_STRING) {
  		zend_throw_exception(sodium_exception_ce, "PHP strings are required", 0);
  		return;
  	}
  
  	sodium_separate_string(val_zv);
  	val = (unsigned char *) Z_STRVAL(*val_zv);
  	val_len = Z_STRLEN(*val_zv);
  	if (val_len != addv_len) {
  		zend_throw_exception(sodium_exception_ce, "values must have the same length", 0);
  		return;
  	}
  	sodium_add(val, addv, val_len);
  }
  
  PHP_FUNCTION(sodium_memcmp)
  {
  	char      *buf1;
  	char      *buf2;
  	size_t     len1;
  	size_t     len2;
  
  	if (zend_parse_parameters_throw(ZEND_NUM_ARGS(), "ss",
  									&buf1, &len1,
  									&buf2, &len2) == FAILURE) {
  		sodium_remove_param_values_from_backtrace(EG(exception));
  		return;
  	}
  	if (len1 != len2) {
  		zend_throw_exception(sodium_exception_ce, "arguments have different sizes", 0);
  		return;
  	}
  	RETURN_LONG(sodium_memcmp(buf1, buf2, len1));
  }
  
  PHP_FUNCTION(sodium_crypto_shorthash)
  {
  	zend_string   *hash;
  	unsigned char *key;
  	unsigned char *msg;
  	size_t         key_len;
  	size_t         msg_len;
  
  	if (zend_parse_parameters_throw(ZEND_NUM_ARGS(), "ss",
  									&msg, &msg_len,
  									&key, &key_len) == FAILURE) {
  		sodium_remove_param_values_from_backtrace(EG(exception));
  		return;
  	}
  	if (key_len != crypto_shorthash_KEYBYTES) {
  		zend_throw_exception(sodium_exception_ce,
  				   "key size should be SODIUM_CRYPTO_SHORTHASH_KEYBYTES bytes",
  				   0);
  		return;
  	}
  	hash = zend_string_alloc(crypto_shorthash_BYTES, 0);
  	if (crypto_shorthash((unsigned char *) ZSTR_VAL(hash), msg,
  						 (unsigned long long) msg_len, key) != 0) {
  		zend_string_efree(hash);
  		zend_throw_exception(sodium_exception_ce, "internal error", 0);
  		return;
  	}
  	ZSTR_VAL(hash)[crypto_shorthash_BYTES] = 0;
  
  	RETURN_NEW_STR(hash);
  }
  
  PHP_FUNCTION(sodium_crypto_secretbox)
  {
  	zend_string   *ciphertext;
  	unsigned char *key;
  	unsigned char *msg;
  	unsigned char *nonce;
  	size_t         key_len;
  	size_t         msg_len;
  	size_t         nonce_len;
  
  	if (zend_parse_parameters_throw(ZEND_NUM_ARGS(), "sss",
  									&msg, &msg_len,
  									&nonce, &nonce_len,
  									&key, &key_len) == FAILURE) {
  		sodium_remove_param_values_from_backtrace(EG(exception));
  		return;
  	}
  	if (nonce_len != crypto_secretbox_NONCEBYTES) {
  		zend_throw_exception(sodium_exception_ce,
  				   "nonce size should be SODIUM_CRYPTO_SECRETBOX_NONCEBYTES bytes",
  				   0);
  		return;
  	}
  	if (key_len != crypto_secretbox_KEYBYTES) {
  		zend_throw_exception(sodium_exception_ce,
  				   "key size should be SODIUM_CRYPTO_SECRETBOX_KEYBYTES bytes",
  				   0);
  		return;
  	}
  	if (SIZE_MAX - msg_len <= crypto_secretbox_MACBYTES) {
  		zend_throw_exception(sodium_exception_ce, "arithmetic overflow", 0);
  		return;
  	}
  	ciphertext = zend_string_alloc((size_t) msg_len + crypto_secretbox_MACBYTES, 0);
  	if (crypto_secretbox_easy((unsigned char *) ZSTR_VAL(ciphertext),
  							  msg, (unsigned long long) msg_len,
  							  nonce, key) != 0) {
  		zend_string_efree(ciphertext);
  		zend_throw_exception(sodium_exception_ce, "internal error", 0);
  		return;
  	}
  	ZSTR_VAL(ciphertext)[msg_len + crypto_secretbox_MACBYTES] = 0;
  
  	RETURN_NEW_STR(ciphertext);
  }
  
  PHP_FUNCTION(sodium_crypto_secretbox_open)
  {
  	zend_string   *msg;
  	unsigned char *key;
  	unsigned char *ciphertext;
  	unsigned char *nonce;
  	size_t         key_len;
  	size_t         ciphertext_len;
  	size_t         nonce_len;
  
  	if (zend_parse_parameters_throw(ZEND_NUM_ARGS(), "sss",
  									&ciphertext, &ciphertext_len,
  									&nonce, &nonce_len,
  									&key, &key_len) == FAILURE) {
  		sodium_remove_param_values_from_backtrace(EG(exception));
  		return;
  	}
  	if (nonce_len != crypto_secretbox_NONCEBYTES) {
  		zend_throw_exception(sodium_exception_ce,
  				   "nonce size should be SODIUM_CRYPTO_SECRETBOX_NONCEBYTES bytes",
  				   0);
  		return;
  	}
  	if (key_len != crypto_secretbox_KEYBYTES) {
  		zend_throw_exception(sodium_exception_ce,
  				   "key size should be SODIUM_CRYPTO_SECRETBOX_KEYBYTES bytes",
  				   0);
  		return;
  	}
  	if (ciphertext_len < crypto_secretbox_MACBYTES) {
  		RETURN_FALSE;
  	}
  	msg = zend_string_alloc
  		((size_t) ciphertext_len - crypto_secretbox_MACBYTES, 0);
  	if (crypto_secretbox_open_easy((unsigned char *) ZSTR_VAL(msg), ciphertext,
  								   (unsigned long long) ciphertext_len,
  								   nonce, key) != 0) {
  		zend_string_efree(msg);
  		RETURN_FALSE;
  	} else {
  		ZSTR_VAL(msg)[ciphertext_len - crypto_secretbox_MACBYTES] = 0;
  		RETURN_NEW_STR(msg);
  	}
  }
  
  PHP_FUNCTION(sodium_crypto_generichash)
  {
  	zend_string   *hash;
  	unsigned char *key = NULL;
  	unsigned char *msg;
  	zend_long      hash_len = crypto_generichash_BYTES;
  	size_t         key_len = 0;
  	size_t         msg_len;
  
  	if (zend_parse_parameters_throw(ZEND_NUM_ARGS(), "s|sl",
  									&msg, &msg_len,
  									&key, &key_len,
  									&hash_len) == FAILURE) {
  		sodium_remove_param_values_from_backtrace(EG(exception));
  		return;
  	}
  	if (hash_len < crypto_generichash_BYTES_MIN ||
  		hash_len > crypto_generichash_BYTES_MAX) {
  		zend_throw_exception(sodium_exception_ce, "unsupported output length", 0);
  		return;
  	}
  	if (key_len != 0 &&
  		(key_len < crypto_generichash_KEYBYTES_MIN ||
  		 key_len > crypto_generichash_KEYBYTES_MAX)) {
  		zend_throw_exception(sodium_exception_ce, "unsupported key length", 0);
  		return;
  	}
  	hash = zend_string_alloc(hash_len, 0);
  	if (crypto_generichash((unsigned char *) ZSTR_VAL(hash), (size_t) hash_len,
  						   msg, (unsigned long long) msg_len,
  						   key, (size_t) key_len) != 0) {
  		zend_string_efree(hash);
  		zend_throw_exception(sodium_exception_ce, "internal error", 0);
  		return;
  	}
  	ZSTR_VAL(hash)[hash_len] = 0;
  
  	RETURN_NEW_STR(hash);
  }
  
  PHP_FUNCTION(sodium_crypto_generichash_init)
  {
  	crypto_generichash_state  state_tmp;
  	zend_string              *state;
  	unsigned char            *key = NULL;
  	size_t                    state_len = sizeof (crypto_generichash_state);
  	zend_long                 hash_len = crypto_generichash_BYTES;
  	size_t                    key_len = 0;
  
  	if (zend_parse_parameters_throw(ZEND_NUM_ARGS(), "|sl",
  									&key, &key_len,
  									&hash_len) == FAILURE) {
  		sodium_remove_param_values_from_backtrace(EG(exception));
  		return;
  	}
  	if (hash_len < crypto_generichash_BYTES_MIN ||
  		hash_len > crypto_generichash_BYTES_MAX) {
  		zend_throw_exception(sodium_exception_ce, "unsupported output length", 0);
  		return;
  	}
  	if (key_len != 0 &&
  		(key_len < crypto_generichash_KEYBYTES_MIN ||
  		 key_len > crypto_generichash_KEYBYTES_MAX)) {
  		zend_throw_exception(sodium_exception_ce, "unsupported key length", 0);
  		return;
  	}
  	memset(&state_tmp, 0, sizeof state_tmp);
  	if (crypto_generichash_init((void *) &state_tmp, key, (size_t) key_len,
  								(size_t) hash_len) != 0) {
  		zend_throw_exception(sodium_exception_ce, "internal error", 0);
  		return;
  	}
  	state = zend_string_alloc(state_len, 0);
  	memcpy(ZSTR_VAL(state), &state_tmp, state_len);
  	sodium_memzero(&state_tmp, sizeof state_tmp);
  	ZSTR_VAL(state)[state_len] = 0;
  
  	RETURN_STR(state);
  }
  
  PHP_FUNCTION(sodium_crypto_generichash_update)
  {
  	crypto_generichash_state  state_tmp;
  	zval                     *state_zv;
  	unsigned char            *msg;
  	unsigned char            *state;
  	size_t                    msg_len;
  	size_t                    state_len;
  
  	if (zend_parse_parameters_throw(ZEND_NUM_ARGS(), "zs",
  									&state_zv, &msg, &msg_len) == FAILURE) {
  		sodium_remove_param_values_from_backtrace(EG(exception));
  		return;
  	}
  	ZVAL_DEREF(state_zv);
  	if (Z_TYPE_P(state_zv) != IS_STRING) {
  		zend_throw_exception(sodium_exception_ce, "a reference to a state is required", 0);
  		return;
  	}
  	sodium_separate_string(state_zv);
  	state = (unsigned char *) Z_STRVAL(*state_zv);
  	state_len = Z_STRLEN(*state_zv);
  	if (state_len != sizeof (crypto_generichash_state)) {
  		zend_throw_exception(sodium_exception_ce, "incorrect state length", 0);
  		return;
  	}
  	memcpy(&state_tmp, state, sizeof state_tmp);
  	if (crypto_generichash_update((void *) &state_tmp, msg,
  								  (unsigned long long) msg_len) != 0) {
  		sodium_memzero(&state_tmp, sizeof state_tmp);
  		zend_throw_exception(sodium_exception_ce, "internal error", 0);
  		return;
  	}
  	memcpy(state, &state_tmp, state_len);
  	sodium_memzero(&state_tmp, sizeof state_tmp);
  
  	RETURN_TRUE;
  }
  
  PHP_FUNCTION(sodium_crypto_generichash_final)
  {
  	crypto_generichash_state  state_tmp;
  	zend_string              *hash;
  	zval                     *state_zv;
  	unsigned char            *state;
  	size_t                    state_len;
  	zend_long                 hash_len = crypto_generichash_BYTES;
  
  	if (zend_parse_parameters_throw(ZEND_NUM_ARGS(), "z|l",
  									&state_zv, &hash_len) == FAILURE) {
  		sodium_remove_param_values_from_backtrace(EG(exception));
  		return;
  	}
  	ZVAL_DEREF(state_zv);
  	if (Z_TYPE_P(state_zv) != IS_STRING) {
  		zend_throw_exception(sodium_exception_ce, "a reference to a state is required", 0);
  		return;
  	}
  	sodium_separate_string(state_zv);
  	state = (unsigned char *) Z_STRVAL(*state_zv);
  	state_len = Z_STRLEN(*state_zv);
  	if (state_len != sizeof (crypto_generichash_state)) {
  		zend_throw_exception(sodium_exception_ce, "incorrect state length", 0);
  		return;
  	}
  	if (hash_len < crypto_generichash_BYTES_MIN ||
  		hash_len > crypto_generichash_BYTES_MAX) {
  		zend_throw_exception(sodium_exception_ce, "unsupported output length", 0);
  		return;
  	}
  	hash = zend_string_alloc(hash_len, 0);
  	memcpy(&state_tmp, state, sizeof state_tmp);
  	if (crypto_generichash_final((void *) &state_tmp,
  								 (unsigned char *) ZSTR_VAL(hash),
  								 (size_t) hash_len) != 0) {
  		sodium_memzero(&state_tmp, sizeof state_tmp);
  		zend_string_efree(hash);
  		zend_throw_exception(sodium_exception_ce, "internal error", 0);
  		return;
  	}
  	sodium_memzero(&state_tmp, sizeof state_tmp);
  	sodium_memzero(state, state_len);
  	convert_to_null(state_zv);
  	ZSTR_VAL(hash)[hash_len] = 0;
  
  	RETURN_NEW_STR(hash);
  }
  
  PHP_FUNCTION(sodium_crypto_box_keypair)
  {
  	zend_string *keypair;
  	size_t       keypair_len;
  
  	if (zend_parse_parameters_none() == FAILURE) {
  		return;
  	}
  	keypair_len = crypto_box_SECRETKEYBYTES + crypto_box_PUBLICKEYBYTES;
  	keypair = zend_string_alloc(keypair_len, 0);
  	if (crypto_box_keypair((unsigned char *) ZSTR_VAL(keypair) +
  						   crypto_box_SECRETKEYBYTES,
  						   (unsigned char *) ZSTR_VAL(keypair)) != 0) {
  		zend_string_efree(keypair);
  		zend_throw_exception(sodium_exception_ce, "internal error", 0);
  		return;
  	}
  	ZSTR_VAL(keypair)[keypair_len] = 0;
  
  	RETURN_NEW_STR(keypair);
  }
  
  PHP_FUNCTION(sodium_crypto_box_seed_keypair)
  {
  	zend_string   *keypair;
  	unsigned char *seed;
  	size_t         keypair_len;
  	size_t         seed_len;
  
  	if (zend_parse_parameters_throw(ZEND_NUM_ARGS(), "s",
  									&seed, &seed_len) == FAILURE) {
  		sodium_remove_param_values_from_backtrace(EG(exception));
  		return;
  	}
  	if (seed_len != crypto_box_SEEDBYTES) {
  		zend_throw_exception(sodium_exception_ce,
  				   "seed should be SODIUM_CRYPTO_BOX_SEEDBYTES bytes",
  				   0);
  		return;
  	}
  	keypair_len = crypto_box_SECRETKEYBYTES + crypto_box_PUBLICKEYBYTES;
  	keypair = zend_string_alloc(keypair_len, 0);
  	if (crypto_box_seed_keypair((unsigned char *) ZSTR_VAL(keypair) +
  								 crypto_box_SECRETKEYBYTES,
  								 (unsigned char *) ZSTR_VAL(keypair),
  								 seed) != 0) {
  		zend_string_efree(keypair);
  		zend_throw_exception(sodium_exception_ce, "internal error", 0);
  		return;
  	}
  	ZSTR_VAL(keypair)[keypair_len] = 0;
  
  	RETURN_NEW_STR(keypair);
  }
  
  PHP_FUNCTION(sodium_crypto_box_keypair_from_secretkey_and_publickey)
  {
  	zend_string *keypair;
  	char        *publickey;
  	char        *secretkey;
  	size_t       keypair_len;
  	size_t       publickey_len;
  	size_t       secretkey_len;
  
  	if (zend_parse_parameters_throw(ZEND_NUM_ARGS(), "ss",
  									&secretkey, &secretkey_len,
  									&publickey, &publickey_len) == FAILURE) {
  		sodium_remove_param_values_from_backtrace(EG(exception));
  		return;
  	}
  	if (secretkey_len != crypto_box_SECRETKEYBYTES) {
  		zend_throw_exception(sodium_exception_ce,
  				   "secretkey should be SODIUM_CRYPTO_BOX_SECRETKEYBYTES bytes",
  				   0);
  		return;
  	}
  	if (publickey_len != crypto_box_PUBLICKEYBYTES) {
  		zend_throw_exception(sodium_exception_ce,
  				   "publickey should be SODIUM_CRYPTO_BOX_PUBLICKEYBYTES bytes",
  				   0);
  		return;
  	}
  	keypair_len = crypto_box_SECRETKEYBYTES + crypto_box_PUBLICKEYBYTES;
  	keypair = zend_string_alloc(keypair_len, 0);
  	memcpy(ZSTR_VAL(keypair), secretkey, crypto_box_SECRETKEYBYTES);
  	memcpy(ZSTR_VAL(keypair) + crypto_box_SECRETKEYBYTES, publickey,
  		   crypto_box_PUBLICKEYBYTES);
  	ZSTR_VAL(keypair)[keypair_len] = 0;
  
  	RETURN_STR(keypair);
  }
  
  PHP_FUNCTION(sodium_crypto_box_secretkey)
  {
  	zend_string   *secretkey;
  	unsigned char *keypair;
  	size_t         keypair_len;
  
  	if (zend_parse_parameters_throw(ZEND_NUM_ARGS(), "s",
  									&keypair, &keypair_len) == FAILURE) {
  		sodium_remove_param_values_from_backtrace(EG(exception));
  		return;
  	}
  	if (keypair_len !=
  		crypto_box_SECRETKEYBYTES + crypto_box_PUBLICKEYBYTES) {
  		zend_throw_exception(sodium_exception_ce,
  				   "keypair should be SODIUM_CRYPTO_BOX_KEYPAIRBYTES bytes",
  				   0);
  		return;
  	}
  	secretkey = zend_string_alloc(crypto_box_SECRETKEYBYTES, 0);
  	memcpy(ZSTR_VAL(secretkey), keypair, crypto_box_SECRETKEYBYTES);
  	ZSTR_VAL(secretkey)[crypto_box_SECRETKEYBYTES] = 0;
  
  	RETURN_STR(secretkey);
  }
  
  PHP_FUNCTION(sodium_crypto_box_publickey)
  {
  	zend_string   *publickey;
  	unsigned char *keypair;
  	size_t         keypair_len;
  
  	if (zend_parse_parameters_throw(ZEND_NUM_ARGS(), "s",
  									&keypair, &keypair_len) == FAILURE) {
  		sodium_remove_param_values_from_backtrace(EG(exception));
  		return;
  	}
  	if (keypair_len !=
  		crypto_box_SECRETKEYBYTES + crypto_box_PUBLICKEYBYTES) {
  		zend_throw_exception(sodium_exception_ce,
  				   "keypair should be SODIUM_CRYPTO_BOX_KEYPAIRBYTES bytes",
  				   0);
  		return;
  	}
  	publickey = zend_string_alloc(crypto_box_PUBLICKEYBYTES, 0);
  	memcpy(ZSTR_VAL(publickey), keypair + crypto_box_SECRETKEYBYTES,
  		   crypto_box_PUBLICKEYBYTES);
  	ZSTR_VAL(publickey)[crypto_box_PUBLICKEYBYTES] = 0;
  
  	RETURN_STR(publickey);
  }
  
  PHP_FUNCTION(sodium_crypto_box_publickey_from_secretkey)
  {
  	zend_string   *publickey;
  	unsigned char *secretkey;
  	size_t         secretkey_len;
  
  	if (zend_parse_parameters_throw(ZEND_NUM_ARGS(), "s",
  									&secretkey, &secretkey_len) == FAILURE) {
  		sodium_remove_param_values_from_backtrace(EG(exception));
  		return;
  	}
  	if (secretkey_len != crypto_box_SECRETKEYBYTES) {
  		zend_throw_exception(sodium_exception_ce,
  				   "key should be SODIUM_CRYPTO_BOX_SECRETKEYBYTES bytes",
  				   0);
  		return;
  	}
  	publickey = zend_string_alloc(crypto_box_PUBLICKEYBYTES, 0);
  	(void) sizeof(int[crypto_scalarmult_BYTES ==
  					  crypto_box_PUBLICKEYBYTES ? 1 : -1]);
  	(void) sizeof(int[crypto_scalarmult_SCALARBYTES ==
  					  crypto_box_SECRETKEYBYTES ? 1 : -1]);
  	crypto_scalarmult_base((unsigned char *) ZSTR_VAL(publickey), secretkey);
  	ZSTR_VAL(publickey)[crypto_box_PUBLICKEYBYTES] = 0;
  
  	RETURN_STR(publickey);
  }
  
  PHP_FUNCTION(sodium_crypto_box)
  {
  	zend_string   *ciphertext;
  	unsigned char *keypair;
  	unsigned char *msg;
  	unsigned char *nonce;
  	unsigned char *publickey;
  	unsigned char *secretkey;
  	size_t         keypair_len;
  	size_t         msg_len;
  	size_t         nonce_len;
  
  	if (zend_parse_parameters_throw(ZEND_NUM_ARGS(), "sss",
  									&msg, &msg_len,
  									&nonce, &nonce_len,
  									&keypair, &keypair_len) == FAILURE) {
  		sodium_remove_param_values_from_backtrace(EG(exception));
  		return;
  	}
  	if (nonce_len != crypto_box_NONCEBYTES) {
  		zend_throw_exception(sodium_exception_ce,
  				   "nonce size should be SODIUM_CRYPTO_BOX_NONCEBYTES bytes",
  				   0);
  		return;
  	}
  	if (keypair_len != crypto_box_SECRETKEYBYTES + crypto_box_PUBLICKEYBYTES) {
  		zend_throw_exception(sodium_exception_ce,
  				   "keypair size should be SODIUM_CRYPTO_BOX_KEYPAIRBYTES bytes",
  				   0);
  		return;
  	}
  	secretkey = keypair;
  	publickey = keypair + crypto_box_SECRETKEYBYTES;
  	if (SIZE_MAX - msg_len <= crypto_box_MACBYTES) {
  		zend_throw_exception(sodium_exception_ce, "arithmetic overflow", 0);
  		return;
  	}
  	ciphertext = zend_string_alloc((size_t) msg_len + crypto_box_MACBYTES, 0);
  	if (crypto_box_easy((unsigned char *) ZSTR_VAL(ciphertext), msg,
  						(unsigned long long) msg_len,
  						nonce, publickey, secretkey) != 0) {
  		zend_string_efree(ciphertext);
  		zend_throw_exception(sodium_exception_ce, "internal error", 0);
  		return;
  	}
  	ZSTR_VAL(ciphertext)[msg_len + crypto_box_MACBYTES] = 0;
  
  	RETURN_NEW_STR(ciphertext);
  }
  
  PHP_FUNCTION(sodium_crypto_box_open)
  {
  	zend_string   *msg;
  	unsigned char *ciphertext;
  	unsigned char *keypair;
  	unsigned char *nonce;
  	unsigned char *publickey;
  	unsigned char *secretkey;
  	size_t         ciphertext_len;
  	size_t         keypair_len;
  	size_t         nonce_len;
  
  	if (zend_parse_parameters_throw(ZEND_NUM_ARGS(), "sss",
  									&ciphertext, &ciphertext_len,
  									&nonce, &nonce_len,
  									&keypair, &keypair_len) == FAILURE) {
  		sodium_remove_param_values_from_backtrace(EG(exception));
  		return;
  	}
  	if (nonce_len != crypto_box_NONCEBYTES) {
  		zend_throw_exception(sodium_exception_ce,
  				   "nonce size should be SODIUM_CRYPTO_BOX_NONCEBYTES bytes",
  				   0);
  		return;
  	}
  	if (keypair_len != crypto_box_SECRETKEYBYTES + crypto_box_PUBLICKEYBYTES) {
  		zend_throw_exception(sodium_exception_ce,
  				   "keypair size should be SODIUM_CRYPTO_BOX_KEYPAIRBYTES bytes",
  				   0);
  		return;
  	}
  	secretkey = keypair;
  	publickey = keypair + crypto_box_SECRETKEYBYTES;
  	if (ciphertext_len < crypto_box_MACBYTES) {
  		RETURN_FALSE;
  	}
  	msg = zend_string_alloc((size_t) ciphertext_len - crypto_box_MACBYTES, 0);
  	if (crypto_box_open_easy((unsigned char *) ZSTR_VAL(msg), ciphertext,
  							 (unsigned long long) ciphertext_len,
  							 nonce, publickey, secretkey) != 0) {
  		zend_string_efree(msg);
  		RETURN_FALSE;
  	} else {
  		ZSTR_VAL(msg)[ciphertext_len - crypto_box_MACBYTES] = 0;
  		RETURN_NEW_STR(msg);
  	}
  }
  
  PHP_FUNCTION(sodium_crypto_box_seal)
  {
  	zend_string   *ciphertext;
  	unsigned char *msg;
  	unsigned char *publickey;
  	size_t         msg_len;
  	size_t         publickey_len;
  
  	if (zend_parse_parameters_throw(ZEND_NUM_ARGS(), "ss",
  									&msg, &msg_len,
  									&publickey, &publickey_len) == FAILURE) {
  		sodium_remove_param_values_from_backtrace(EG(exception));
  		return;
  	}
  	if (publickey_len != crypto_box_PUBLICKEYBYTES) {
  		zend_throw_exception(sodium_exception_ce,
  				   "public key size should be SODIUM_CRYPTO_BOX_PUBLICKEYBYTES bytes",
  				   0);
  		return;
  	}
  	if (SIZE_MAX - msg_len <= crypto_box_SEALBYTES) {
  		zend_throw_exception(sodium_exception_ce, "arithmetic overflow", 0);
  		return;
  	}
  	ciphertext = zend_string_alloc((size_t) msg_len + crypto_box_SEALBYTES, 0);
  	if (crypto_box_seal((unsigned char *) ZSTR_VAL(ciphertext), msg,
  						(unsigned long long) msg_len, publickey) != 0) {
  		zend_string_efree(ciphertext);
  		zend_throw_exception(sodium_exception_ce, "internal error", 0);
  		return;
  	}
  	ZSTR_VAL(ciphertext)[msg_len + crypto_box_SEALBYTES] = 0;
  
  	RETURN_NEW_STR(ciphertext);
  }
  
  PHP_FUNCTION(sodium_crypto_box_seal_open)
  {
  	zend_string   *msg;
  	unsigned char *ciphertext;
  	unsigned char *keypair;
  	unsigned char *publickey;
  	unsigned char *secretkey;
  	size_t         ciphertext_len;
  	size_t         keypair_len;
  
  	if (zend_parse_parameters_throw(ZEND_NUM_ARGS(), "ss",
  									&ciphertext, &ciphertext_len,
  									&keypair, &keypair_len) == FAILURE) {
  		sodium_remove_param_values_from_backtrace(EG(exception));
  		return;
  	}
  	if (keypair_len != crypto_box_SECRETKEYBYTES + crypto_box_PUBLICKEYBYTES) {
  		zend_throw_exception(sodium_exception_ce,
  				   "keypair size should be SODIUM_CRYPTO_BOX_KEYPAIRBYTES bytes",
  				   0);
  		return;
  	}
  	secretkey = keypair;
  	publickey = keypair + crypto_box_SECRETKEYBYTES;
  	if (ciphertext_len < crypto_box_SEALBYTES) {
  		RETURN_FALSE;
  	}
  	msg = zend_string_alloc((size_t) ciphertext_len - crypto_box_SEALBYTES, 0);
  	if (crypto_box_seal_open((unsigned char *) ZSTR_VAL(msg), ciphertext,
  							 (unsigned long long) ciphertext_len,
  							 publickey, secretkey) != 0) {
  		zend_string_efree(msg);
  		RETURN_FALSE;
  	} else {
  		ZSTR_VAL(msg)[ciphertext_len - crypto_box_SEALBYTES] = 0;
  		RETURN_NEW_STR(msg);
  	}
  }
  
  PHP_FUNCTION(sodium_crypto_sign_keypair)
  {
  	zend_string *keypair;
  	size_t       keypair_len;
  
  	if (zend_parse_parameters_none() == FAILURE) {
  		return;
  	}
  	keypair_len = crypto_sign_SECRETKEYBYTES + crypto_sign_PUBLICKEYBYTES;
  	keypair = zend_string_alloc(keypair_len, 0);
  	if (crypto_sign_keypair((unsigned char *) ZSTR_VAL(keypair) +
  							crypto_sign_SECRETKEYBYTES,
  							(unsigned char *) ZSTR_VAL(keypair)) != 0) {
  		zend_string_efree(keypair);
  		zend_throw_exception(sodium_exception_ce, "internal error", 0);
  		return;
  	}
  	ZSTR_VAL(keypair)[keypair_len] = 0;
  
  	RETURN_NEW_STR(keypair);
  }
  
  PHP_FUNCTION(sodium_crypto_sign_seed_keypair)
  {
  	zend_string   *keypair;
  	unsigned char *seed;
  	size_t         keypair_len;
  	size_t         seed_len;
  
  	if (zend_parse_parameters_throw(ZEND_NUM_ARGS(), "s",
  									&seed, &seed_len) == FAILURE) {
  		sodium_remove_param_values_from_backtrace(EG(exception));
  		return;
  	}
  	if (seed_len != crypto_sign_SEEDBYTES) {
  		zend_throw_exception(sodium_exception_ce,
  				   "seed should be SODIUM_CRYPTO_SIGN_SEEDBYTES bytes",
  				   0);
  		return;
  	}
  	keypair_len = crypto_sign_SECRETKEYBYTES + crypto_sign_PUBLICKEYBYTES;
  	keypair = zend_string_alloc(keypair_len, 0);
  	if (crypto_sign_seed_keypair((unsigned char *) ZSTR_VAL(keypair) +
  								 crypto_sign_SECRETKEYBYTES,
  								 (unsigned char *) ZSTR_VAL(keypair),
  								 seed) != 0) {
  		zend_string_efree(keypair);
  		zend_throw_exception(sodium_exception_ce, "internal error", 0);
  		return;
  	}
  	ZSTR_VAL(keypair)[keypair_len] = 0;
  
  	RETURN_NEW_STR(keypair);
  }
  
  PHP_FUNCTION(sodium_crypto_sign_keypair_from_secretkey_and_publickey)
  {
  	zend_string *keypair;
  	char        *publickey;
  	char        *secretkey;
  	size_t       keypair_len;
  	size_t       publickey_len;
  	size_t       secretkey_len;
  
  	if (zend_parse_parameters_throw(ZEND_NUM_ARGS(), "ss",
  									&secretkey, &secretkey_len,
  									&publickey, &publickey_len) == FAILURE) {
  		sodium_remove_param_values_from_backtrace(EG(exception));
  		return;
  	}
  	if (secretkey_len != crypto_sign_SECRETKEYBYTES) {
  		zend_throw_exception(sodium_exception_ce,
  				   "secretkey should be SODIUM_CRYPTO_SIGN_SECRETKEYBYTES bytes",
  				   0);
  		return;
  	}
  	if (publickey_len != crypto_sign_PUBLICKEYBYTES) {
  		zend_throw_exception(sodium_exception_ce,
  				   "publickey should be SODIUM_CRYPTO_SIGN_PUBLICKEYBYTES bytes",
  				   0);
  		return;
  	}
  	keypair_len = crypto_sign_SECRETKEYBYTES + crypto_sign_PUBLICKEYBYTES;
  	keypair = zend_string_alloc(keypair_len, 0);
  	memcpy(ZSTR_VAL(keypair), secretkey, crypto_sign_SECRETKEYBYTES);
  	memcpy(ZSTR_VAL(keypair) + crypto_sign_SECRETKEYBYTES, publickey,
  		   crypto_sign_PUBLICKEYBYTES);
  	ZSTR_VAL(keypair)[keypair_len] = 0;
  
  	RETURN_STR(keypair);
  }
  
  PHP_FUNCTION(sodium_crypto_sign_publickey_from_secretkey)
  {
  	zend_string *publickey;
  	char        *secretkey;
  	size_t       secretkey_len;
  
  	if (zend_parse_parameters_throw(ZEND_NUM_ARGS(), "s",
  									&secretkey, &secretkey_len) == FAILURE) {
  		sodium_remove_param_values_from_backtrace(EG(exception));
  		return;
  	}
  	if (secretkey_len != crypto_sign_SECRETKEYBYTES) {
  		zend_throw_exception(sodium_exception_ce,
  				   "secretkey should be SODIUM_CRYPTO_SIGN_SECRETKEYBYTES bytes",
  				   0);
  		return;
  	}
  	publickey = zend_string_alloc(crypto_sign_PUBLICKEYBYTES, 0);
  
  	if (crypto_sign_ed25519_sk_to_pk((unsigned char *) ZSTR_VAL(publickey),
  									 (const unsigned char *) secretkey) != 0) {
  		zend_throw_exception(sodium_exception_ce,
  				   "internal error", 0);
  		return;
  	}
  	ZSTR_VAL(publickey)[crypto_sign_PUBLICKEYBYTES] = 0;
  
  	RETURN_STR(publickey);
  }
  
  PHP_FUNCTION(sodium_crypto_sign_secretkey)
  {
  	zend_string   *secretkey;
  	unsigned char *keypair;
  	size_t         keypair_len;
  
  	if (zend_parse_parameters_throw(ZEND_NUM_ARGS(), "s",
  									&keypair, &keypair_len) == FAILURE) {
  		sodium_remove_param_values_from_backtrace(EG(exception));
  		return;
  	}
  	if (keypair_len !=
  		crypto_sign_SECRETKEYBYTES + crypto_sign_PUBLICKEYBYTES) {
  		zend_throw_exception(sodium_exception_ce,
  				   "keypair should be SODIUM_CRYPTO_SIGN_KEYPAIRBYTES bytes",
  				   0);
  		return;
  	}
  	secretkey = zend_string_alloc(crypto_sign_SECRETKEYBYTES, 0);
  	memcpy(ZSTR_VAL(secretkey), keypair, crypto_sign_SECRETKEYBYTES);
  	ZSTR_VAL(secretkey)[crypto_sign_SECRETKEYBYTES] = 0;
  
  	RETURN_STR(secretkey);
  }
  
  PHP_FUNCTION(sodium_crypto_sign_publickey)
  {
  	zend_string   *publickey;
  	unsigned char *keypair;
  	size_t         keypair_len;
  
  	if (zend_parse_parameters_throw(ZEND_NUM_ARGS(), "s",
  									&keypair, &keypair_len) == FAILURE) {
  		sodium_remove_param_values_from_backtrace(EG(exception));
  		return;
  	}
  	if (keypair_len !=
  		crypto_sign_SECRETKEYBYTES + crypto_sign_PUBLICKEYBYTES) {
  		zend_throw_exception(sodium_exception_ce,
  				   "keypair should be SODIUM_CRYPTO_SIGN_KEYPAIRBYTES bytes",
  				   0);
  		return;
  	}
  	publickey = zend_string_alloc(crypto_sign_PUBLICKEYBYTES, 0);
  	memcpy(ZSTR_VAL(publickey), keypair + crypto_sign_SECRETKEYBYTES,
  		   crypto_sign_PUBLICKEYBYTES);
  	ZSTR_VAL(publickey)[crypto_sign_PUBLICKEYBYTES] = 0;
  
  	RETURN_STR(publickey);
  }
  
  PHP_FUNCTION(sodium_crypto_sign)
  {
  	zend_string        *msg_signed;
  	unsigned char      *msg;
  	unsigned char      *secretkey;
  	unsigned long long  msg_signed_real_len;
  	size_t              msg_len;
  	size_t              msg_signed_len;
  	size_t              secretkey_len;
  
  	if (zend_parse_parameters_throw(ZEND_NUM_ARGS(), "ss",
  									&msg, &msg_len,
  									&secretkey, &secretkey_len) == FAILURE) {
  		sodium_remove_param_values_from_backtrace(EG(exception));
  		return;
  	}
  	if (secretkey_len != crypto_sign_SECRETKEYBYTES) {
  		zend_throw_exception(sodium_exception_ce,
  				   "secret key size should be SODIUM_CRYPTO_SIGN_SECRETKEYBYTES bytes",
  				   0);
  		return;
  	}
  	if (SIZE_MAX - msg_len <= crypto_sign_BYTES) {
  		zend_throw_exception(sodium_exception_ce, "arithmetic overflow", 0);
  		return;
  	}
  	msg_signed_len = msg_len + crypto_sign_BYTES;
  	msg_signed = zend_string_alloc((size_t) msg_signed_len, 0);
  	if (crypto_sign((unsigned char *) ZSTR_VAL(msg_signed),
  					&msg_signed_real_len, msg,
  					(unsigned long long) msg_len, secretkey) != 0) {
  		zend_string_efree(msg_signed);
  		zend_throw_exception(sodium_exception_ce, "internal error", 0);
  		return;
  	}
  	if (msg_signed_real_len >= SIZE_MAX || msg_signed_real_len > msg_signed_len) {
  		zend_string_efree(msg_signed);
  		zend_throw_exception(sodium_exception_ce, "arithmetic overflow", 0);
  		return;
  	}
  	PHP_SODIUM_ZSTR_TRUNCATE(msg_signed, (size_t) msg_signed_real_len);
  	ZSTR_VAL(msg_signed)[msg_signed_real_len] = 0;
  
  	RETURN_NEW_STR(msg_signed);
  }
  
  PHP_FUNCTION(sodium_crypto_sign_open)
  {
  	zend_string        *msg;
  	unsigned char      *msg_signed;
  	unsigned char      *publickey;
  	unsigned long long  msg_real_len;
  	size_t              msg_len;
  	size_t              msg_signed_len;
  	size_t              publickey_len;
  
  	if (zend_parse_parameters_throw(ZEND_NUM_ARGS(), "ss",
  									&msg_signed, &msg_signed_len,
  									&publickey, &publickey_len) == FAILURE) {
  		sodium_remove_param_values_from_backtrace(EG(exception));
  		return;
  	}
  	if (publickey_len != crypto_sign_PUBLICKEYBYTES) {
  		zend_throw_exception(sodium_exception_ce,
  				   "public key size should be SODIUM_CRYPTO_SIGN_PUBLICKEYBYTES bytes",
  				   0);
  		return;
  	}
  	msg_len = msg_signed_len;
  	if (msg_len >= SIZE_MAX) {
  		zend_throw_exception(sodium_exception_ce, "arithmetic overflow", 0);
  		return;
  	}
  	msg = zend_string_alloc((size_t) msg_len, 0);
  	if (crypto_sign_open((unsigned char *) ZSTR_VAL(msg), &msg_real_len,
  						 msg_signed, (unsigned long long) msg_signed_len,
  						 publickey) != 0) {
  		zend_string_efree(msg);
  		RETURN_FALSE;
  	}
  	if (msg_real_len >= SIZE_MAX || msg_real_len > msg_signed_len) {
  		zend_string_efree(msg);
  		zend_throw_exception(sodium_exception_ce, "arithmetic overflow", 0);
  		return;
  	}
  	PHP_SODIUM_ZSTR_TRUNCATE(msg, (size_t) msg_real_len);
  	ZSTR_VAL(msg)[msg_real_len] = 0;
  
  	RETURN_NEW_STR(msg);
  }
  
  PHP_FUNCTION(sodium_crypto_sign_detached)
  {
  	zend_string        *signature;
  	unsigned char      *msg;
  	unsigned char      *secretkey;
  	unsigned long long  signature_real_len;
  	size_t              msg_len;
  	size_t              secretkey_len;
  
  	if (zend_parse_parameters_throw(ZEND_NUM_ARGS(), "ss",
  									&msg, &msg_len,
  									&secretkey, &secretkey_len) == FAILURE) {
  		sodium_remove_param_values_from_backtrace(EG(exception));
  		return;
  	}
  	if (secretkey_len != crypto_sign_SECRETKEYBYTES) {
  		zend_throw_exception(sodium_exception_ce,
  				   "secret key size should be SODIUM_CRYPTO_SIGN_SECRETKEYBYTES bytes",
  				   0);
  		return;
  	}
  	signature = zend_string_alloc((size_t) crypto_sign_BYTES, 0);
  	memset(ZSTR_VAL(signature), 0, (size_t) crypto_sign_BYTES);
  	if (crypto_sign_detached((unsigned char *) ZSTR_VAL(signature),
  							 &signature_real_len, msg,
  							 (unsigned long long) msg_len, secretkey) != 0) {
  		zend_string_efree(signature);
  		zend_throw_exception(sodium_exception_ce, "signature creation failed", 0);
  		return;
  	}
  	if (signature_real_len <= 0U || signature_real_len > crypto_sign_BYTES) {
  		zend_string_efree(signature);
  		zend_throw_exception(sodium_exception_ce, "signature has a bogus size", 0);
  		return;
  	}
  	PHP_SODIUM_ZSTR_TRUNCATE(signature, (size_t) signature_real_len);
  	ZSTR_VAL(signature)[signature_real_len] = 0;
  
  	RETURN_NEW_STR(signature);
  }
  
  PHP_FUNCTION(sodium_crypto_sign_verify_detached)
  {
  	unsigned char *msg;
  	unsigned char *publickey;
  	unsigned char *signature;
  	size_t         msg_len;
  	size_t         publickey_len;
  	size_t         signature_len;
  
  	if (zend_parse_parameters_throw(ZEND_NUM_ARGS(), "sss",
  									&signature, &signature_len,
  									&msg, &msg_len,
  									&publickey, &publickey_len) == FAILURE) {
  		sodium_remove_param_values_from_backtrace(EG(exception));
  		return;
  	}
  	if (signature_len != crypto_sign_BYTES) {
  		zend_throw_exception(sodium_exception_ce,
  				   "signature size should be SODIUM_CRYPTO_SIGN_BYTES bytes",
  				   0);
  		return;
  	}
  	if (publickey_len != crypto_sign_PUBLICKEYBYTES) {
  		zend_throw_exception(sodium_exception_ce,
  				   "public key size should be SODIUM_CRYPTO_SIGN_PUBLICKEYBYTES bytes",
  				   0);
  		return;
  	}
  	if (crypto_sign_verify_detached(signature,
  									msg, (unsigned long long) msg_len,
  									publickey) != 0) {
  		RETURN_FALSE;
  	}
  	RETURN_TRUE;
  }
  
  PHP_FUNCTION(sodium_crypto_stream)
  {
  	zend_string   *ciphertext;
  	unsigned char *key;
  	unsigned char *nonce;
  	zend_long      ciphertext_len;
  	size_t         key_len;
  	size_t         nonce_len;
  
  	if (zend_parse_parameters_throw(ZEND_NUM_ARGS(), "lss",
  									&ciphertext_len,
  									&nonce, &nonce_len,
  									&key, &key_len) == FAILURE) {
  		sodium_remove_param_values_from_backtrace(EG(exception));
  		return;
  	}
  	if (ciphertext_len <= 0 || ciphertext_len >= SIZE_MAX) {
  		zend_throw_exception(sodium_exception_ce, "ciphertext length must be greater than 0", 0);
  		return;
  	}
  	if (nonce_len != crypto_stream_NONCEBYTES) {
  		zend_throw_exception(sodium_exception_ce, "nonce should be SODIUM_CRYPTO_STREAM_NONCEBYTES bytes", 0);
  		return;
  	}
  	if (key_len != crypto_stream_KEYBYTES) {
  		zend_throw_exception(sodium_exception_ce, "key should be SODIUM_CRYPTO_STREAM_KEYBYTES bytes", 0);
  		return;
  	}
  	ciphertext = zend_string_alloc((size_t) ciphertext_len, 0);
  	if (crypto_stream((unsigned char *) ZSTR_VAL(ciphertext),
  					  (unsigned long long) ciphertext_len, nonce, key) != 0) {
  		zend_string_efree(ciphertext);
  		zend_throw_exception(sodium_exception_ce, "internal error", 0);
  		return;
  	}
  	ZSTR_VAL(ciphertext)[ciphertext_len] = 0;
  
  	RETURN_NEW_STR(ciphertext);
  }
  
  PHP_FUNCTION(sodium_crypto_stream_xor)
  {
  	zend_string   *ciphertext;
  	unsigned char *key;
  	unsigned char *msg;
  	unsigned char *nonce;
  	size_t         ciphertext_len;
  	size_t         key_len;
  	size_t         msg_len;
  	size_t         nonce_len;
  
  	if (zend_parse_parameters_throw(ZEND_NUM_ARGS(), "sss",
  									&msg, &msg_len,
  									&nonce, &nonce_len,
  									&key, &key_len) == FAILURE) {
  		sodium_remove_param_values_from_backtrace(EG(exception));
  		return;
  	}
  	if (nonce_len != crypto_stream_NONCEBYTES) {
  		zend_throw_exception(sodium_exception_ce, "nonce should be SODIUM_CRYPTO_STREAM_NONCEBYTES bytes", 0);
  		return;
  	}
  	if (key_len != crypto_stream_KEYBYTES) {
  		zend_throw_exception(sodium_exception_ce, "key should be SODIUM_CRYPTO_STREAM_KEYBYTES bytes", 0);
  		return;
  	}
  	ciphertext_len = msg_len;
  	ciphertext = zend_string_alloc((size_t) ciphertext_len, 0);
  	if (crypto_stream_xor((unsigned char *) ZSTR_VAL(ciphertext), msg,
  						  (unsigned long long) msg_len, nonce, key) != 0) {
  		zend_string_efree(ciphertext);
  		zend_throw_exception(sodium_exception_ce, "internal error", 0);
  		return;
  	}
  	ZSTR_VAL(ciphertext)[ciphertext_len] = 0;
  
  	RETURN_NEW_STR(ciphertext);
  }
  
  #ifdef crypto_pwhash_SALTBYTES
  PHP_FUNCTION(sodium_crypto_pwhash)
  {
  	zend_string   *hash;
  	unsigned char *salt;
  	char          *passwd;
  	zend_long      hash_len;
  	zend_long      memlimit;
  	zend_long      opslimit;
  	zend_long      alg;
  	size_t         passwd_len;
  	size_t         salt_len;
  	int            ret;
  
  	alg = (zend_long) crypto_pwhash_ALG_DEFAULT;
  	if (zend_parse_parameters_throw(ZEND_NUM_ARGS(), "lssll|l",
  									&hash_len,
  									&passwd, &passwd_len,
  									&salt, &salt_len,
  									&opslimit, &memlimit, &alg) == FAILURE) {
  		sodium_remove_param_values_from_backtrace(EG(exception));
  		return;
  	}
  	if (hash_len <= 0 || hash_len >= 0xffffffff) {
  		zend_throw_exception(sodium_exception_ce, "hash length must be greater than 0", 0);
  		return;
  	}
  	if (passwd_len >= 0xffffffff) {
  		zend_throw_exception(sodium_exception_ce, "unsupported password length", 0);
  		return;
  	}
  	if (opslimit <= 0) {
  		zend_throw_exception(sodium_exception_ce, "ops limit must be greater than 0", 0);
  		return;
  	}
  	if (memlimit <= 0 || memlimit > SIZE_MAX) {
  		zend_throw_exception(sodium_exception_ce, "memory limit must be greater than 0", 0);
  		return;
  	}
  	if (alg != crypto_pwhash_ALG_ARGON2I13
  # ifdef crypto_pwhash_ALG_ARGON2ID13
  		&& alg != crypto_pwhash_ALG_ARGON2ID13
  # endif
  		&& alg != crypto_pwhash_ALG_DEFAULT) {
  		zend_throw_exception(sodium_exception_ce, "unsupported password hashing algorithm", 0);
  		return;
  	}
  	if (passwd_len <= 0) {
  		zend_error(E_WARNING, "empty password");
  	}
  	if (salt_len != crypto_pwhash_SALTBYTES) {
  		zend_throw_exception(sodium_exception_ce, "salt should be SODIUM_CRYPTO_PWHASH_SALTBYTES bytes", 0);
  		return;
  	}
  	if (opslimit < crypto_pwhash_OPSLIMIT_MIN) {
  		zend_throw_exception(sodium_exception_ce,
  							 "number of operations for the password hashing function is too low", 0);
  		return;
  	}
  	if (memlimit < crypto_pwhash_MEMLIMIT_MIN) {
  		zend_throw_exception(sodium_exception_ce,
  							 "maximum memory for the password hashing function is too low", 0);
  	}
  	hash = zend_string_alloc((size_t) hash_len, 0);
  	ret = -1;
  # ifdef crypto_pwhash_ALG_ARGON2ID13
  	if (alg == crypto_pwhash_ALG_ARGON2ID13) {
  		ret = crypto_pwhash_argon2id
  			((unsigned char *) ZSTR_VAL(hash), (unsigned long long) hash_len,
  			  passwd, (unsigned long long) passwd_len, salt,
  			  (unsigned long long) opslimit, (size_t) memlimit, (int) alg);
  	}
  # endif
  	if (ret == -1) {
  		ret = crypto_pwhash
  			((unsigned char *) ZSTR_VAL(hash), (unsigned long long) hash_len,
  			  passwd, (unsigned long long) passwd_len, salt,
  			  (unsigned long long) opslimit, (size_t) memlimit, (int) alg);
  	}
  	if (ret != 0) {
  		zend_string_efree(hash);
  		zend_throw_exception(sodium_exception_ce, "internal error", 0);
  		return;
  	}
  	ZSTR_VAL(hash)[hash_len] = 0;
  
  	RETURN_NEW_STR(hash);
  }
  
  PHP_FUNCTION(sodium_crypto_pwhash_str)
  {
  	zend_string *hash_str;
  	char        *passwd;
  	zend_long    memlimit;
  	zend_long    opslimit;
  	size_t       passwd_len;
  	size_t       len;
  
  	if (zend_parse_parameters_throw(ZEND_NUM_ARGS(), "sll",
  									&passwd, &passwd_len,
  									&opslimit, &memlimit) == FAILURE) {
  		sodium_remove_param_values_from_backtrace(EG(exception));
  		return;
  	}
  	if (opslimit <= 0) {
  		zend_throw_exception(sodium_exception_ce, "ops limit must be greater than 0", 0);
  		return;
  	}
  	if (memlimit <= 0 || memlimit > SIZE_MAX) {
  		zend_throw_exception(sodium_exception_ce, "memory limit must be greater than 0", 0);
  		return;
  	}
  	if (passwd_len >= 0xffffffff) {
  		zend_throw_exception(sodium_exception_ce, "unsupported password length", 0);
  		return;
  	}
  	if (passwd_len <= 0) {
  		zend_error(E_WARNING, "empty password");
  	}
  	if (opslimit < crypto_pwhash_OPSLIMIT_MIN) {
  		zend_throw_exception(sodium_exception_ce,
  							 "number of operations for the password hashing function is too low", 0);
  	}
  	if (memlimit < crypto_pwhash_MEMLIMIT_MIN) {
  		zend_throw_exception(sodium_exception_ce,
  							 "maximum memory for the password hashing function is too low", 0);
  	}
  	hash_str = zend_string_alloc(crypto_pwhash_STRBYTES - 1, 0);
  	if (crypto_pwhash_str
  		(ZSTR_VAL(hash_str), passwd, (unsigned long long) passwd_len,
  		 (unsigned long long) opslimit, (size_t) memlimit) != 0) {
  		zend_string_efree(hash_str);
  		zend_throw_exception(sodium_exception_ce, "internal error", 0);
  		return;
  	}
  	ZSTR_VAL(hash_str)[crypto_pwhash_STRBYTES - 1] = 0;
  
  	len = strlen(ZSTR_VAL(hash_str));
  	PHP_SODIUM_ZSTR_TRUNCATE(hash_str, len);
  
  	RETURN_NEW_STR(hash_str);
  }
  
  #if SODIUM_LIBRARY_VERSION_MAJOR > 9 || (SODIUM_LIBRARY_VERSION_MAJOR == 9 && SODIUM_LIBRARY_VERSION_MINOR >= 6)
  PHP_FUNCTION(sodium_crypto_pwhash_str_needs_rehash)
  {
  	char      *hash_str;
  	zend_long  memlimit;
  	zend_long  opslimit;
  	size_t     hash_str_len;
  
  	if (zend_parse_parameters_throw(ZEND_NUM_ARGS(), "sll",
  									&hash_str, &hash_str_len, &opslimit, &memlimit) == FAILURE) {
  		zend_throw_exception(sodium_exception_ce, "a PHP string is required", 0);
  		return;
  	}
  	if (crypto_pwhash_str_needs_rehash(hash_str, opslimit, memlimit) == 0) {
  		RETURN_FALSE;
  	}
  	RETURN_TRUE;
  }
  #endif
  
  PHP_FUNCTION(sodium_crypto_pwhash_str_verify)
  {
  	char      *hash_str;
  	char      *passwd;
  	size_t     hash_str_len;
  	size_t     passwd_len;
  
  	if (zend_parse_parameters_throw(ZEND_NUM_ARGS(), "ss",
  									&hash_str, &hash_str_len,
  									&passwd, &passwd_len) == FAILURE) {
  		sodium_remove_param_values_from_backtrace(EG(exception));
  		return;
  	}
  	if (passwd_len >= 0xffffffff) {
  		zend_throw_exception(sodium_exception_ce,
  				   "unsupported password length", 0);
  		return;
  	}
  	if (passwd_len <= 0) {
  		zend_error(E_WARNING, "empty password");
  	}
  	if (crypto_pwhash_str_verify
  		(hash_str, passwd, (unsigned long long) passwd_len) == 0) {
  		RETURN_TRUE;
  	}
  	RETURN_FALSE;
  }
  #endif
  
  #ifdef crypto_pwhash_scryptsalsa208sha256_SALTBYTES
  PHP_FUNCTION(sodium_crypto_pwhash_scryptsalsa208sha256)
  {
  	zend_string   *hash;
  	unsigned char *salt;
  	char          *passwd;
  	zend_long      hash_len;
  	zend_long      memlimit;
  	zend_long      opslimit;
  	size_t         passwd_len;
  	size_t         salt_len;
  
  	if (zend_parse_parameters_throw(ZEND_NUM_ARGS(), "lssll",
  									&hash_len,
  									&passwd, &passwd_len,
  									&salt, &salt_len,
  									&opslimit, &memlimit) == FAILURE) {
  		sodium_remove_param_values_from_backtrace(EG(exception));
  		return;
  	}
  	if (hash_len <= 0 || hash_len >= SIZE_MAX || hash_len > 0x1fffffffe0ULL) {
  		zend_throw_exception(sodium_exception_ce, "hash length must be greater than 0", 0);
  		return;
  	}
  	if (opslimit <= 0) {
  		zend_throw_exception(sodium_exception_ce, "ops limit must be greater than 0", 0);
  		return;
  	}
  	if (memlimit <= 0 || memlimit > SIZE_MAX) {
  		zend_throw_exception(sodium_exception_ce, "memory limit must be greater than 0", 0);
  		return;
  	}
  	if (passwd_len <= 0) {
  		zend_error(E_WARNING, "empty password");
  	}
  	if (salt_len != crypto_pwhash_scryptsalsa208sha256_SALTBYTES) {
  		zend_throw_exception(sodium_exception_ce,
  				   "salt should be SODIUM_CRYPTO_PWHASH_SCRYPTSALSA208SHA256_SALTBYTES bytes",
  				   0);
  		return;
  	}
  	if (opslimit < crypto_pwhash_scryptsalsa208sha256_OPSLIMIT_INTERACTIVE) {
  		zend_throw_exception(sodium_exception_ce,
  							 "number of operations for the scrypt function is too low", 0);
  	}
  	if (memlimit < crypto_pwhash_scryptsalsa208sha256_MEMLIMIT_INTERACTIVE) {
  		zend_throw_exception(sodium_exception_ce,
  							 "maximum memory for the scrypt function is too low", 0);
  	}
  	hash = zend_string_alloc((size_t) hash_len, 0);
  	if (crypto_pwhash_scryptsalsa208sha256
  		((unsigned char *) ZSTR_VAL(hash), (unsigned long long) hash_len,
  		 passwd, (unsigned long long) passwd_len, salt,
  		 (unsigned long long) opslimit, (size_t) memlimit) != 0) {
  		zend_string_efree(hash);
  		zend_throw_exception(sodium_exception_ce, "internal error", 0);
  		return;
  	}
  	ZSTR_VAL(hash)[hash_len] = 0;
  
  	RETURN_NEW_STR(hash);
  }
  
  PHP_FUNCTION(sodium_crypto_pwhash_scryptsalsa208sha256_str)
  {
  	zend_string *hash_str;
  	char        *passwd;
  	zend_long    memlimit;
  	zend_long    opslimit;
  	size_t       passwd_len;
  
  	if (zend_parse_parameters_throw(ZEND_NUM_ARGS(), "sll",
  									&passwd, &passwd_len,
  									&opslimit, &memlimit) == FAILURE) {
  		sodium_remove_param_values_from_backtrace(EG(exception));
  		return;
  	}
  	if (opslimit <= 0) {
  		zend_throw_exception(sodium_exception_ce, "ops limit must be greater than 0", 0);
  		return;
  	}
  	if (memlimit <= 0 || memlimit > SIZE_MAX) {
  		zend_throw_exception(sodium_exception_ce, "memory limit must be greater than 0", 0);
  		return;
  	}
  	if (passwd_len <= 0) {
  		zend_error(E_WARNING, "empty password");
  	}
  	if (opslimit < crypto_pwhash_scryptsalsa208sha256_OPSLIMIT_INTERACTIVE) {
  		zend_throw_exception(sodium_exception_ce,
  							 "number of operations for the scrypt function is too low", 0);
  	}
  	if (memlimit < crypto_pwhash_scryptsalsa208sha256_MEMLIMIT_INTERACTIVE) {
  		zend_throw_exception(sodium_exception_ce,
  							 "maximum memory for the scrypt function is too low", 0);
  	}
  	hash_str = zend_string_alloc
  		(crypto_pwhash_scryptsalsa208sha256_STRBYTES - 1, 0);
  	if (crypto_pwhash_scryptsalsa208sha256_str
  		(ZSTR_VAL(hash_str), passwd, (unsigned long long) passwd_len,
  		 (unsigned long long) opslimit, (size_t) memlimit) != 0) {
  		zend_string_efree(hash_str);
  		zend_throw_exception(sodium_exception_ce, "internal error", 0);
  		return;
  	}
  	ZSTR_VAL(hash_str)[crypto_pwhash_scryptsalsa208sha256_STRBYTES - 1] = 0;
  
  	RETURN_NEW_STR(hash_str);
  }
  
  PHP_FUNCTION(sodium_crypto_pwhash_scryptsalsa208sha256_str_verify)
  {
  	char      *hash_str;
  	char      *passwd;
  	size_t     hash_str_len;
  	size_t     passwd_len;
  
  	if (zend_parse_parameters_throw(ZEND_NUM_ARGS(), "ss",
  									&hash_str, &hash_str_len,
  									&passwd, &passwd_len) == FAILURE) {
  		sodium_remove_param_values_from_backtrace(EG(exception));
  		return;
  	}
  	if (passwd_len <= 0) {
  		zend_error(E_WARNING, "empty password");
  	}
  	if (hash_str_len != crypto_pwhash_scryptsalsa208sha256_STRBYTES - 1) {
  		zend_error(E_WARNING, "wrong size for the hashed password");
  		RETURN_FALSE;
  	}
  	if (crypto_pwhash_scryptsalsa208sha256_str_verify
  		(hash_str, passwd, (unsigned long long) passwd_len) == 0) {
  		RETURN_TRUE;
  	}
  	RETURN_FALSE;
  }
  #endif
  
  PHP_FUNCTION(sodium_crypto_aead_aes256gcm_is_available)
  {
  	if (zend_parse_parameters_none() == FAILURE) {
  		return;
  	}
  #ifdef HAVE_AESGCM
  	RETURN_BOOL(crypto_aead_aes256gcm_is_available());
  #else
  	RETURN_FALSE;
  #endif
  }
  
  #ifdef HAVE_AESGCM
  PHP_FUNCTION(sodium_crypto_aead_aes256gcm_encrypt)
  {
  	zend_string        *ciphertext;
  	unsigned char      *ad;
  	unsigned char      *msg;
  	unsigned char      *npub;
  	unsigned char      *secretkey;
  	unsigned long long  ciphertext_real_len;
  	size_t              ad_len;
  	size_t              ciphertext_len;
  	size_t              msg_len;
  	size_t              npub_len;
  	size_t              secretkey_len;
  
  	if (zend_parse_parameters_throw(ZEND_NUM_ARGS(), "ssss",
  									&msg, &msg_len,
  									&ad, &ad_len,
  									&npub, &npub_len,
  									&secretkey, &secretkey_len) == FAILURE) {
  		sodium_remove_param_values_from_backtrace(EG(exception));
  		return;
  	}
  	if (npub_len != crypto_aead_aes256gcm_NPUBBYTES) {
  		zend_throw_exception(sodium_exception_ce,
  				   "public nonce size should be "
  				   "SODIUM_CRYPTO_AEAD_AES256GCM_NPUBBYTES bytes",
  				   0);
  		return;
  	}
  	if (secretkey_len != crypto_aead_aes256gcm_KEYBYTES) {
  		zend_throw_exception(sodium_exception_ce,
  				   "secret key size should be "
  				   "SODIUM_CRYPTO_AEAD_AES256GCM_KEYBYTES bytes",
  				   0);
  		return;
  	}
  	if (SIZE_MAX - msg_len <= crypto_aead_aes256gcm_ABYTES) {
  		zend_throw_exception(sodium_exception_ce, "arithmetic overflow", 0);
  		return;
  	}
  	if ((unsigned long long) msg_len > (16ULL * ((1ULL << 32) - 2ULL)) - crypto_aead_aes256gcm_ABYTES) {
  		zend_throw_exception(sodium_exception_ce, "message too long for a single key", 0);
  		return;
  	}
  	ciphertext_len = msg_len + crypto_aead_aes256gcm_ABYTES;
  	ciphertext = zend_string_alloc((size_t) ciphertext_len, 0);
  	if (crypto_aead_aes256gcm_encrypt
  		((unsigned char *) ZSTR_VAL(ciphertext), &ciphertext_real_len, msg,
  		 (unsigned long long) msg_len,
  		 ad, (unsigned long long) ad_len, NULL, npub, secretkey) != 0) {
  		zend_string_efree(ciphertext);
  		zend_throw_exception(sodium_exception_ce, "internal error", 0);
  		return;
  	}
  	if (ciphertext_real_len <= 0U || ciphertext_real_len >= SIZE_MAX ||
  		ciphertext_real_len > ciphertext_len) {
  		zend_string_efree(ciphertext);
  		zend_throw_exception(sodium_exception_ce, "arithmetic overflow", 0);
  		return;
  	}
  	PHP_SODIUM_ZSTR_TRUNCATE(ciphertext, (size_t) ciphertext_real_len);
  	ZSTR_VAL(ciphertext)[ciphertext_real_len] = 0;
  
  	RETURN_NEW_STR(ciphertext);
  }
  
  PHP_FUNCTION(sodium_crypto_aead_aes256gcm_decrypt)
  {
  	zend_string        *msg;
  	unsigned char      *ad;
  	unsigned char      *ciphertext;
  	unsigned char      *npub;
  	unsigned char      *secretkey;
  	unsigned long long  msg_real_len;
  	size_t              ad_len;
  	size_t              ciphertext_len;
  	size_t              msg_len;
  	size_t              npub_len;
  	size_t              secretkey_len;
  
  	if (zend_parse_parameters_throw(ZEND_NUM_ARGS(), "ssss",
  									&ciphertext, &ciphertext_len,
  									&ad, &ad_len,
  									&npub, &npub_len,
  									&secretkey, &secretkey_len) == FAILURE) {
  		sodium_remove_param_values_from_backtrace(EG(exception));
  		return;
  	}
  	if (npub_len != crypto_aead_aes256gcm_NPUBBYTES) {
  		zend_throw_exception(sodium_exception_ce,
  				   "public nonce size should be "
  				   "SODIUM_CRYPTO_AEAD_AES256GCM_NPUBBYTES bytes",
  				   0);
  		return;
  	}
  	if (secretkey_len != crypto_aead_aes256gcm_KEYBYTES) {
  		zend_throw_exception(sodium_exception_ce,
  				   "secret key size should be "
  				   "SODIUM_CRYPTO_AEAD_AES256GCM_KEYBYTES bytes",
  				   0);
  		return;
  	}
  	if (ciphertext_len < crypto_aead_aes256gcm_ABYTES) {
  		RETURN_FALSE;
  	}
  	if (ciphertext_len - crypto_aead_aes256gcm_ABYTES > 16ULL * ((1ULL << 32) - 2ULL)) {
  		zend_throw_exception(sodium_exception_ce, "message too long for a single key", 0);
  		return;
  	}
  	msg_len = ciphertext_len;
  	if (msg_len >= SIZE_MAX) {
  		zend_throw_exception(sodium_exception_ce, "arithmetic overflow", 0);
  		return;
  	}
  	msg = zend_string_alloc((size_t) msg_len, 0);
  	if (crypto_aead_aes256gcm_decrypt
  		((unsigned char *) ZSTR_VAL(msg), &msg_real_len, NULL,
  		 ciphertext, (unsigned long long) ciphertext_len,
  		 ad, (unsigned long long) ad_len, npub, secretkey) != 0) {
  		zend_string_efree(msg);
  		RETURN_FALSE;
  	}
  	if (msg_real_len >= SIZE_MAX || msg_real_len > msg_len) {
  		zend_string_efree(msg);
  		zend_throw_exception(sodium_exception_ce, "arithmetic overflow", 0);
  		return;
  	}
  	PHP_SODIUM_ZSTR_TRUNCATE(msg, (size_t) msg_real_len);
  	ZSTR_VAL(msg)[msg_real_len] = 0;
  
  	RETURN_NEW_STR(msg);
  }
  #endif
  
  PHP_FUNCTION(sodium_crypto_aead_chacha20poly1305_encrypt)
  {
  	zend_string        *ciphertext;
  	unsigned char      *ad;
  	unsigned char      *msg;
  	unsigned char      *npub;
  	unsigned char      *secretkey;
  	unsigned long long  ciphertext_real_len;
  	size_t              ad_len;
  	size_t              ciphertext_len;
  	size_t              msg_len;
  	size_t              npub_len;
  	size_t              secretkey_len;
  
  	if (zend_parse_parameters_throw(ZEND_NUM_ARGS(), "ssss",
  									&msg, &msg_len,
  									&ad, &ad_len,
  									&npub, &npub_len,
  									&secretkey, &secretkey_len) == FAILURE) {
  		sodium_remove_param_values_from_backtrace(EG(exception));
  		return;
  	}
  	if (npub_len != crypto_aead_chacha20poly1305_NPUBBYTES) {
  		zend_throw_exception(sodium_exception_ce,
  				   "public nonce size should be "
  				   "SODIUM_CRYPTO_AEAD_CHACHA20POLY1305_NPUBBYTES bytes",
  				   0);
  		return;
  	}
  	if (secretkey_len != crypto_aead_chacha20poly1305_KEYBYTES) {
  		zend_throw_exception(sodium_exception_ce,
  				   "secret key size should be "
  				   "SODIUM_CRYPTO_AEAD_CHACHA20POLY1305_KEYBYTES bytes",
  				   0);
  		return;
  	}
  	if (SIZE_MAX - msg_len <= crypto_aead_chacha20poly1305_ABYTES) {
  		zend_throw_exception(sodium_exception_ce, "arithmetic overflow", 0);
  		return;
  	}
  	ciphertext_len = msg_len + crypto_aead_chacha20poly1305_ABYTES;
  	ciphertext = zend_string_alloc((size_t) ciphertext_len, 0);
  	if (crypto_aead_chacha20poly1305_encrypt
  		((unsigned char *) ZSTR_VAL(ciphertext), &ciphertext_real_len, msg,
  		 (unsigned long long) msg_len,
  		 ad, (unsigned long long) ad_len, NULL, npub, secretkey) != 0) {
  		zend_string_efree(ciphertext);
  		zend_throw_exception(sodium_exception_ce, "internal error", 0);
  		return;
  	}
  	if (ciphertext_real_len <= 0U || ciphertext_real_len >= SIZE_MAX ||
  		ciphertext_real_len > ciphertext_len) {
  		zend_string_efree(ciphertext);
  		zend_throw_exception(sodium_exception_ce, "arithmetic overflow", 0);
  		return;
  	}
  	PHP_SODIUM_ZSTR_TRUNCATE(ciphertext, (size_t) ciphertext_real_len);
  	ZSTR_VAL(ciphertext)[ciphertext_real_len] = 0;
  
  	RETURN_NEW_STR(ciphertext);
  }
  
  PHP_FUNCTION(sodium_crypto_aead_chacha20poly1305_decrypt)
  {
  	zend_string        *msg;
  	unsigned char      *ad;
  	unsigned char      *ciphertext;
  	unsigned char      *npub;
  	unsigned char      *secretkey;
  	unsigned long long  msg_real_len;
  	size_t              ad_len;
  	size_t              ciphertext_len;
  	size_t              msg_len;
  	size_t              npub_len;
  	size_t              secretkey_len;
  
  	if (zend_parse_parameters_throw(ZEND_NUM_ARGS(), "ssss",
  									&ciphertext, &ciphertext_len,
  									&ad, &ad_len,
  									&npub, &npub_len,
  									&secretkey, &secretkey_len) == FAILURE) {
  		sodium_remove_param_values_from_backtrace(EG(exception));
  		return;
  	}
  	if (npub_len != crypto_aead_chacha20poly1305_NPUBBYTES) {
  		zend_throw_exception(sodium_exception_ce,
  				   "public nonce size should be "
  				   "SODIUM_CRYPTO_AEAD_CHACHA20POLY1305_NPUBBYTES bytes",
  				   0);
  		return;
  	}
  	if (secretkey_len != crypto_aead_chacha20poly1305_KEYBYTES) {
  		zend_throw_exception(sodium_exception_ce,
  				   "secret key size should be "
  				   "SODIUM_CRYPTO_AEAD_CHACHA20POLY1305_KEYBYTES bytes",
  				   0);
  		return;
  	}
  	if (ciphertext_len < crypto_aead_chacha20poly1305_ABYTES) {
  		RETURN_FALSE;
  	}
  	msg_len = ciphertext_len;
  	if (msg_len >= SIZE_MAX) {
  		zend_throw_exception(sodium_exception_ce, "arithmetic overflow", 0);
  		return;
  	}
  	msg = zend_string_alloc((size_t) msg_len, 0);
  	if (crypto_aead_chacha20poly1305_decrypt
  		((unsigned char *) ZSTR_VAL(msg), &msg_real_len, NULL,
  		 ciphertext, (unsigned long long) ciphertext_len,
  		 ad, (unsigned long long) ad_len, npub, secretkey) != 0) {
  		zend_string_efree(msg);
  		RETURN_FALSE;
  	}
  	if (msg_real_len >= SIZE_MAX || msg_real_len > msg_len) {
  		zend_string_efree(msg);
  		zend_throw_exception(sodium_exception_ce, "arithmetic overflow", 0);
  		return;
  	}
  	PHP_SODIUM_ZSTR_TRUNCATE(msg, (size_t) msg_real_len);
  	ZSTR_VAL(msg)[msg_real_len] = 0;
  
  	RETURN_NEW_STR(msg);
  }
  
  PHP_FUNCTION(sodium_crypto_aead_chacha20poly1305_ietf_encrypt)
  {
  	zend_string        *ciphertext;
  	unsigned char      *ad;
  	unsigned char      *msg;
  	unsigned char      *npub;
  	unsigned char      *secretkey;
  	unsigned long long  ciphertext_real_len;
  	size_t              ad_len;
  	size_t              ciphertext_len;
  	size_t              msg_len;
  	size_t              npub_len;
  	size_t              secretkey_len;
  
  	if (zend_parse_parameters_throw(ZEND_NUM_ARGS(), "ssss",
  									&msg, &msg_len,
  									&ad, &ad_len,
  									&npub, &npub_len,
  									&secretkey, &secretkey_len) == FAILURE) {
  		sodium_remove_param_values_from_backtrace(EG(exception));
  		return;
  	}
  	if (npub_len != crypto_aead_chacha20poly1305_IETF_NPUBBYTES) {
  		zend_throw_exception(sodium_exception_ce,
  				   "public nonce size should be "
  				   "SODIUM_CRYPTO_AEAD_CHACHA20POLY1305_IETF_NPUBBYTES bytes",
  				   0);
  		return;
  	}
  	if (secretkey_len != crypto_aead_chacha20poly1305_IETF_KEYBYTES) {
  		zend_throw_exception(sodium_exception_ce,
  				   "secret key size should be "
  				   "SODIUM_CRYPTO_AEAD_CHACHA20POLY1305_IETF_KEYBYTES bytes",
  				   0);
  		return;
  	}
  	if (SIZE_MAX - msg_len <= crypto_aead_chacha20poly1305_IETF_ABYTES) {
  		zend_throw_exception(sodium_exception_ce, "arithmetic overflow", 0);
  		return;
  	}
  	if ((unsigned long long) msg_len > 64ULL * (1ULL << 32) - 64ULL) {
  		zend_throw_exception(sodium_exception_ce, "message too long for a single key", 0);
  		return;
  	}
  	ciphertext_len = msg_len + crypto_aead_chacha20poly1305_IETF_ABYTES;
  	ciphertext = zend_string_alloc((size_t) ciphertext_len, 0);
  	if (crypto_aead_chacha20poly1305_ietf_encrypt
  		((unsigned char *) ZSTR_VAL(ciphertext), &ciphertext_real_len, msg,
  		 (unsigned long long) msg_len,
  		 ad, (unsigned long long) ad_len, NULL, npub, secretkey) != 0) {
  		zend_string_efree(ciphertext);
  		zend_throw_exception(sodium_exception_ce, "internal error", 0);
  		return;
  	}
  	if (ciphertext_real_len <= 0U || ciphertext_real_len >= SIZE_MAX ||
  		ciphertext_real_len > ciphertext_len) {
  		zend_string_efree(ciphertext);
  		zend_throw_exception(sodium_exception_ce, "arithmetic overflow", 0);
  		return;
  	}
  	PHP_SODIUM_ZSTR_TRUNCATE(ciphertext, (size_t) ciphertext_real_len);
  	ZSTR_VAL(ciphertext)[ciphertext_real_len] = 0;
  
  	RETURN_NEW_STR(ciphertext);
  }
  
  PHP_FUNCTION(sodium_crypto_aead_chacha20poly1305_ietf_decrypt)
  {
  	zend_string        *msg;
  	unsigned char      *ad;
  	unsigned char      *ciphertext;
  	unsigned char      *npub;
  	unsigned char      *secretkey;
  	unsigned long long  msg_real_len;
  	size_t              ad_len;
  	size_t              ciphertext_len;
  	size_t              msg_len;
  	size_t              npub_len;
  	size_t              secretkey_len;
  
  	if (zend_parse_parameters_throw(ZEND_NUM_ARGS(), "ssss",
  									&ciphertext, &ciphertext_len,
  									&ad, &ad_len,
  									&npub, &npub_len,
  									&secretkey, &secretkey_len) == FAILURE) {
  		sodium_remove_param_values_from_backtrace(EG(exception));
  		return;
  	}
  	if (npub_len != crypto_aead_chacha20poly1305_IETF_NPUBBYTES) {
  		zend_throw_exception(sodium_exception_ce,
  				   "public nonce size should be "
  				   "SODIUM_CRYPTO_AEAD_CHACHA20POLY1305_IETF_NPUBBYTES bytes",
  				   0);
  		return;
  	}
  	if (secretkey_len != crypto_aead_chacha20poly1305_IETF_KEYBYTES) {
  		zend_throw_exception(sodium_exception_ce,
  				   "secret key size should be "
  				   "SODIUM_CRYPTO_AEAD_CHACHA20POLY1305_IETF_KEYBYTES bytes",
  				   0);
  		return;
  	}
  	msg_len = ciphertext_len;
  	if (msg_len >= SIZE_MAX) {
  		zend_throw_exception(sodium_exception_ce, "arithmetic overflow", 0);
  		return;
  	}
  	if (ciphertext_len < crypto_aead_chacha20poly1305_IETF_ABYTES) {
  		RETURN_FALSE;
  	}
  	if ((unsigned long long) ciphertext_len -
  		crypto_aead_chacha20poly1305_IETF_ABYTES > 64ULL * (1ULL << 32) - 64ULL) {
  		zend_throw_exception(sodium_exception_ce, "message too long for a single key", 0);
  		return;
  	}
  	msg = zend_string_alloc((size_t) msg_len, 0);
  	if (crypto_aead_chacha20poly1305_ietf_decrypt
  		((unsigned char *) ZSTR_VAL(msg), &msg_real_len, NULL,
  		 ciphertext, (unsigned long long) ciphertext_len,
  		 ad, (unsigned long long) ad_len, npub, secretkey) != 0) {
  		zend_string_efree(msg);
  		RETURN_FALSE;
  	}
  	if (msg_real_len >= SIZE_MAX || msg_real_len > msg_len) {
  		zend_string_efree(msg);
  		zend_throw_exception(sodium_exception_ce, "arithmetic overflow", 0);
  		return;
  	}
  	PHP_SODIUM_ZSTR_TRUNCATE(msg, (size_t) msg_real_len);
  	ZSTR_VAL(msg)[msg_real_len] = 0;
  
  	RETURN_NEW_STR(msg);
  }
  
  #ifdef crypto_aead_xchacha20poly1305_IETF_NPUBBYTES
  PHP_FUNCTION(sodium_crypto_aead_xchacha20poly1305_ietf_encrypt)
  {
  	zend_string        *ciphertext;
  	unsigned char      *ad;
  	unsigned char      *msg;
  	unsigned char      *npub;
  	unsigned char      *secretkey;
  	unsigned long long  ciphertext_real_len;
  	size_t              ad_len;
  	size_t              ciphertext_len;
  	size_t              msg_len;
  	size_t              npub_len;
  	size_t              secretkey_len;
  
  	if (zend_parse_parameters_throw(ZEND_NUM_ARGS(), "ssss",
  									&msg, &msg_len,
  									&ad, &ad_len,
  									&npub, &npub_len,
  									&secretkey, &secretkey_len) == FAILURE) {
  		sodium_remove_param_values_from_backtrace(EG(exception));
  		return;
  	}
  	if (npub_len != crypto_aead_xchacha20poly1305_IETF_NPUBBYTES) {
  		zend_throw_exception(sodium_exception_ce,
  				   "public nonce size should be "
  				   "SODIUM_CRYPTO_AEAD_XCHACHA20POLY1305_IETF_NPUBBYTES bytes",
  				   0);
  		return;
  	}
  	if (secretkey_len != crypto_aead_xchacha20poly1305_IETF_KEYBYTES) {
  		zend_throw_exception(sodium_exception_ce,
  				   "secret key size should be "
  				   "SODIUM_CRYPTO_AEAD_XCHACHA20POLY1305_IETF_KEYBYTES bytes",
  				   0);
  		return;
  	}
  	if (SIZE_MAX - msg_len <= crypto_aead_xchacha20poly1305_IETF_ABYTES) {
  		zend_throw_exception(sodium_exception_ce, "arithmetic overflow", 0);
  		return;
  	}
  	ciphertext_len = msg_len + crypto_aead_xchacha20poly1305_IETF_ABYTES;
  	ciphertext = zend_string_alloc((size_t) ciphertext_len, 0);
  	if (crypto_aead_xchacha20poly1305_ietf_encrypt
  		((unsigned char *) ZSTR_VAL(ciphertext), &ciphertext_real_len, msg,
  		 (unsigned long long) msg_len,
  		 ad, (unsigned long long) ad_len, NULL, npub, secretkey) != 0) {
  		zend_string_efree(ciphertext);
  		zend_throw_exception(sodium_exception_ce, "internal error", 0);
  		return;
  	}
  	if (ciphertext_real_len <= 0U || ciphertext_real_len >= SIZE_MAX ||
  		ciphertext_real_len > ciphertext_len) {
  		zend_string_efree(ciphertext);
  		zend_throw_exception(sodium_exception_ce, "arithmetic overflow", 0);
  		return;
  	}
  	PHP_SODIUM_ZSTR_TRUNCATE(ciphertext, (size_t) ciphertext_real_len);
  	ZSTR_VAL(ciphertext)[ciphertext_real_len] = 0;
  
  	RETURN_NEW_STR(ciphertext);
  }
  
  PHP_FUNCTION(sodium_crypto_aead_xchacha20poly1305_ietf_decrypt)
  {
  	zend_string        *msg;
  	unsigned char      *ad;
  	unsigned char      *ciphertext;
  	unsigned char      *npub;
  	unsigned char      *secretkey;
  	unsigned long long  msg_real_len;
  	size_t              ad_len;
  	size_t              ciphertext_len;
  	size_t              msg_len;
  	size_t              npub_len;
  	size_t              secretkey_len;
  
  	if (zend_parse_parameters_throw(ZEND_NUM_ARGS(), "ssss",
  									&ciphertext, &ciphertext_len,
  									&ad, &ad_len,
  									&npub, &npub_len,
  									&secretkey, &secretkey_len) == FAILURE) {
  		sodium_remove_param_values_from_backtrace(EG(exception));
  		return;
  	}
  	if (npub_len != crypto_aead_xchacha20poly1305_IETF_NPUBBYTES) {
  		zend_throw_exception(sodium_exception_ce,
  				   "public nonce size should be "
  				   "SODIUM_CRYPTO_AEAD_XCHACHA20POLY1305_IETF_NPUBBYTES bytes",
  				   0);
  		return;
  	}
  	if (secretkey_len != crypto_aead_xchacha20poly1305_IETF_KEYBYTES) {
  		zend_throw_exception(sodium_exception_ce,
  				   "secret key size should be "
  				   "SODIUM_CRYPTO_AEAD_XCHACHA20POLY1305_IETF_KEYBYTES bytes",
  				   0);
  		return;
  	}
  	if (ciphertext_len < crypto_aead_xchacha20poly1305_IETF_ABYTES) {
  		RETURN_FALSE;
  	}
  	msg_len = ciphertext_len;
  	if (msg_len - crypto_aead_xchacha20poly1305_IETF_ABYTES >= SIZE_MAX) {
  		zend_throw_exception(sodium_exception_ce, "arithmetic overflow", 0);
  		return;
  	}
  	if ((unsigned long long) ciphertext_len -
  		crypto_aead_xchacha20poly1305_IETF_ABYTES > 64ULL * (1ULL << 32) - 64ULL) {
  		zend_throw_exception(sodium_exception_ce, "arithmetic overflow", 0);
  		return;
  	}
  	msg = zend_string_alloc((size_t) msg_len, 0);
  	if (crypto_aead_xchacha20poly1305_ietf_decrypt
  		((unsigned char *) ZSTR_VAL(msg), &msg_real_len, NULL,
  		 ciphertext, (unsigned long long) ciphertext_len,
  		 ad, (unsigned long long) ad_len, npub, secretkey) != 0) {
  		zend_string_efree(msg);
  		RETURN_FALSE;
  	}
  	if (msg_real_len >= SIZE_MAX || msg_real_len > msg_len) {
  		zend_string_efree(msg);
  		zend_throw_exception(sodium_exception_ce, "arithmetic overflow", 0);
  		return;
  	}
  	PHP_SODIUM_ZSTR_TRUNCATE(msg, (size_t) msg_real_len);
  	ZSTR_VAL(msg)[msg_real_len] = 0;
  
  	RETURN_NEW_STR(msg);
  }
  #endif
  
  PHP_FUNCTION(sodium_bin2hex)
  {
  	zend_string   *hex;
  	unsigned char *bin;
  	size_t         bin_len;
  	size_t         hex_len;
  
  	if (zend_parse_parameters_throw(ZEND_NUM_ARGS(), "s",
  									&bin, &bin_len) == FAILURE) {
  		sodium_remove_param_values_from_backtrace(EG(exception));
  		return;
  	}
  	if (bin_len >= SIZE_MAX / 2U) {
  		zend_throw_exception(sodium_exception_ce, "arithmetic overflow", 0);
  		return;
  	}
  	hex_len = bin_len * 2U;
  	hex = zend_string_alloc((size_t) hex_len, 0);
  	sodium_bin2hex(ZSTR_VAL(hex), hex_len + 1U, bin, bin_len);
  	ZSTR_VAL(hex)[hex_len] = 0;
  
  	RETURN_STR(hex);
  }
  
  PHP_FUNCTION(sodium_hex2bin)
  {
  	zend_string   *bin;
  	const char    *end;
  	char          *hex;
  	char          *ignore = NULL;
  	size_t         bin_real_len;
  	size_t         bin_len;
  	size_t         hex_len;
  	size_t         ignore_len = 0;
  
  	if (zend_parse_parameters_throw(ZEND_NUM_ARGS(), "s|s",
  									&hex, &hex_len,
  									&ignore, &ignore_len) == FAILURE) {
  		sodium_remove_param_values_from_backtrace(EG(exception));
  		return;
  	}
  	bin_len = hex_len / 2;
  	bin = zend_string_alloc(bin_len, 0);
  	if (sodium_hex2bin((unsigned char *) ZSTR_VAL(bin), bin_len, hex, hex_len,
  					   ignore, &bin_real_len, &end) != 0 ||
  		end != hex + hex_len) {
  		zend_string_efree(bin);
  		zend_throw_exception(sodium_exception_ce, "invalid hex string", 0);
  		return;
  	}
  	if (bin_real_len >= SIZE_MAX || bin_real_len > bin_len) {
  		zend_string_efree(bin);
  		zend_throw_exception(sodium_exception_ce, "arithmetic overflow", 0);
  		return;
  	}
  	PHP_SODIUM_ZSTR_TRUNCATE(bin, (size_t) bin_real_len);
  	ZSTR_VAL(bin)[bin_real_len] = 0;
  
  	RETURN_NEW_STR(bin);
  }
  
  #ifdef sodium_base64_VARIANT_ORIGINAL
  PHP_FUNCTION(sodium_bin2base64)
  {
  	zend_string   *b64;
  	unsigned char *bin;
  	zend_long      variant;
  	size_t         bin_len;
  	size_t         b64_len;
  
  	if (zend_parse_parameters_throw(ZEND_NUM_ARGS(), "sl",
  									&bin, &bin_len, &variant) == FAILURE) {
  		sodium_remove_param_values_from_backtrace(EG(exception));
  		return;
  	}
  	if ((((unsigned int) variant) & ~ 0x6U) != 0x1U) {
  		zend_throw_exception(sodium_exception_ce,
  							 "invalid base64 variant identifier", 0);
  		return;
  	}
  	if (bin_len >= SIZE_MAX / 4U * 3U - 3U - 1U) {
  		zend_throw_exception(sodium_exception_ce, "arithmetic overflow", 0);
  		return;
  	}
  	b64_len = sodium_base64_ENCODED_LEN(bin_len, variant);
  	b64 = zend_string_alloc((size_t) b64_len - 1U, 0);
  	sodium_bin2base64(ZSTR_VAL(b64), b64_len, bin, bin_len, (int) variant);
  
  	RETURN_STR(b64);
  }
  
  PHP_FUNCTION(sodium_base642bin)
  {
  	zend_string   *bin;
  	char          *b64;
  	const char    *end;
  	char          *ignore = NULL;
  	zend_long      variant;
  	size_t         bin_real_len;
  	size_t         bin_len;
  	size_t         b64_len;
  	size_t         ignore_len = 0;
  
  	if (zend_parse_parameters_throw(ZEND_NUM_ARGS(), "sl|s",
  									&b64, &b64_len, &variant,
  									&ignore, &ignore_len) == FAILURE) {
  		sodium_remove_param_values_from_backtrace(EG(exception));
  		return;
  	}
  	if ((((unsigned int) variant) & ~ 0x6U) != 0x1U) {
  		zend_throw_exception(sodium_exception_ce,
  							 "invalid base64 variant identifier", 0);
  		return;
  	}
  	bin_len = b64_len / 4U * 3U + 2U;
  	bin = zend_string_alloc(bin_len, 0);
  	if (sodium_base642bin((unsigned char *) ZSTR_VAL(bin), bin_len,
  						  b64, b64_len,
  						  ignore, &bin_real_len, &end, (int) variant) != 0 ||
  		end != b64 + b64_len) {
  		zend_string_efree(bin);
  		zend_throw_exception(sodium_exception_ce, "invalid base64 string", 0);
  		return;
  	}
  	if (bin_real_len >= SIZE_MAX || bin_real_len > bin_len) {
  		zend_string_efree(bin);
  		zend_throw_exception(sodium_exception_ce, "arithmetic overflow", 0);
  		return;
  	}
  	PHP_SODIUM_ZSTR_TRUNCATE(bin, (size_t) bin_real_len);
  	ZSTR_VAL(bin)[bin_real_len] = 0;
  
  	RETURN_NEW_STR(bin);
  }
  #endif
  
  PHP_FUNCTION(sodium_crypto_scalarmult)
  {
  	zend_string   *q;
  	unsigned char *n;
  	unsigned char *p;
  	size_t         n_len;
  	size_t         p_len;
  
  	if (zend_parse_parameters_throw(ZEND_NUM_ARGS(), "ss",
  									&n, &n_len, &p, &p_len) == FAILURE) {
  		sodium_remove_param_values_from_backtrace(EG(exception));
  		return;
  	}
  	if (n_len != crypto_scalarmult_SCALARBYTES ||
  		p_len != crypto_scalarmult_BYTES) {
  		zend_throw_exception(sodium_exception_ce, "scalar and point must be "
  				   "SODIUM_CRYPTO_SCALARMULT_SCALARBYTES bytes",
  				   0);
  		return;
  	}
  	q = zend_string_alloc(crypto_scalarmult_BYTES, 0);
  	if (crypto_scalarmult((unsigned char *) ZSTR_VAL(q), n, p) != 0) {
  		zend_string_efree(q);
  		zend_throw_exception(sodium_exception_ce, "internal error", 0);
  		return;
  	}
  	ZSTR_VAL(q)[crypto_scalarmult_BYTES] = 0;
  
  	RETURN_NEW_STR(q);
  }
  
  PHP_FUNCTION(sodium_crypto_kx_seed_keypair)
  {
  	unsigned char *sk;
  	unsigned char *pk;
  	unsigned char *seed;
  	size_t         seed_len;
  	zend_string   *keypair;
  
  	if (zend_parse_parameters_throw(ZEND_NUM_ARGS(), "s",
  									&seed, &seed_len) == FAILURE) {
  		sodium_remove_param_values_from_backtrace(EG(exception));
  		return;
  	}
  	if (seed_len != crypto_kx_SEEDBYTES) {
  		zend_throw_exception(sodium_exception_ce, "seed must be SODIUM_CRYPTO_KX_SEEDBYTES bytes", 0);
  		return;
  	}
  	(void) sizeof(int[crypto_scalarmult_SCALARBYTES == crypto_kx_PUBLICKEYBYTES ? 1 : -1]);
  	(void) sizeof(int[crypto_scalarmult_SCALARBYTES == crypto_kx_SECRETKEYBYTES ? 1 : -1]);
  	keypair = zend_string_alloc(crypto_kx_SECRETKEYBYTES + crypto_kx_PUBLICKEYBYTES, 0);
  	sk = (unsigned char *) ZSTR_VAL(keypair);
  	pk = sk + crypto_kx_SECRETKEYBYTES;
  	crypto_generichash(sk, crypto_kx_SECRETKEYBYTES,
  					   seed, crypto_kx_SEEDBYTES, NULL, 0);
  	if (crypto_scalarmult_base(pk, sk) != 0) {
  		zend_throw_exception(sodium_exception_ce, "internal error", 0);
  		return;
  	}
  	ZSTR_VAL(keypair)[crypto_kx_SECRETKEYBYTES + crypto_kx_PUBLICKEYBYTES] = 0;
  	RETURN_STR(keypair);
  }
  
  PHP_FUNCTION(sodium_crypto_kx_keypair)
  {
  	unsigned char *sk;
  	unsigned char *pk;
  	zend_string   *keypair;
  
  	if (zend_parse_parameters_none() == FAILURE) {
  		return;
  	}
  	keypair = zend_string_alloc(crypto_kx_SECRETKEYBYTES + crypto_kx_PUBLICKEYBYTES, 0);
  	sk = (unsigned char *) ZSTR_VAL(keypair);
  	pk = sk + crypto_kx_SECRETKEYBYTES;
  	randombytes_buf(sk, crypto_kx_SECRETKEYBYTES);
  	if (crypto_scalarmult_base(pk, sk) != 0) {
  		zend_throw_exception(sodium_exception_ce, "internal error", 0);
  		return;
  	}
  	RETURN_STR(keypair);
  }
  
  PHP_FUNCTION(sodium_crypto_kx_secretkey)
  {
  	zend_string   *secretkey;
  	unsigned char *keypair;
  	size_t         keypair_len;
  
  	if (zend_parse_parameters_throw(ZEND_NUM_ARGS(), "s",
  									&keypair, &keypair_len) == FAILURE) {
  		sodium_remove_param_values_from_backtrace(EG(exception));
  		return;
  	}
  	if (keypair_len !=
  		crypto_kx_SECRETKEYBYTES + crypto_kx_PUBLICKEYBYTES) {
  		zend_throw_exception(sodium_exception_ce,
  				   "keypair should be SODIUM_CRYPTO_KX_KEYPAIRBYTES bytes",
  				   0);
  		return;
  	}
  	secretkey = zend_string_alloc(crypto_kx_SECRETKEYBYTES, 0);
  	memcpy(ZSTR_VAL(secretkey), keypair, crypto_kx_SECRETKEYBYTES);
  	ZSTR_VAL(secretkey)[crypto_kx_SECRETKEYBYTES] = 0;
  
  	RETURN_STR(secretkey);
  }
  
  PHP_FUNCTION(sodium_crypto_kx_publickey)
  {
  	zend_string   *publickey;
  	unsigned char *keypair;
  	size_t         keypair_len;
  
  	if (zend_parse_parameters_throw(ZEND_NUM_ARGS(), "s",
  									&keypair, &keypair_len) == FAILURE) {
  		sodium_remove_param_values_from_backtrace(EG(exception));
  		return;
  	}
  	if (keypair_len !=
  		crypto_kx_SECRETKEYBYTES + crypto_kx_PUBLICKEYBYTES) {
  		zend_throw_exception(sodium_exception_ce,
  				   "keypair should be SODIUM_CRYPTO_KX_KEYPAIRBYTES bytes",
  				   0);
  		return;
  	}
  	publickey = zend_string_alloc(crypto_kx_PUBLICKEYBYTES, 0);
  	memcpy(ZSTR_VAL(publickey), keypair + crypto_kx_SECRETKEYBYTES,
  		   crypto_kx_PUBLICKEYBYTES);
  	ZSTR_VAL(publickey)[crypto_kx_PUBLICKEYBYTES] = 0;
  
  	RETURN_STR(publickey);
  }
  
  PHP_FUNCTION(sodium_crypto_kx_client_session_keys)
  {
  	crypto_generichash_state h;
  	unsigned char  q[crypto_scalarmult_BYTES];
  	unsigned char *keypair;
  	unsigned char *client_sk;
  	unsigned char *client_pk;
  	unsigned char *server_pk;
  	unsigned char  session_keys[2 * crypto_kx_SESSIONKEYBYTES];
  	size_t         keypair_len;
  	size_t         server_pk_len;
  
  	if (zend_parse_parameters_throw(ZEND_NUM_ARGS(), "ss",
  									&keypair, &keypair_len,
  									&server_pk, &server_pk_len) == FAILURE) {
  		sodium_remove_param_values_from_backtrace(EG(exception));
  		return;
  	}
  	if (keypair_len != crypto_kx_SECRETKEYBYTES + crypto_kx_PUBLICKEYBYTES) {
  		zend_throw_exception(sodium_exception_ce, "keypair must be SODIUM_CRYPTO_KX_KEYPAIRBYTES bytes", 0);
  		return;
  	}
  	if (server_pk_len != crypto_kx_PUBLICKEYBYTES) {
  		zend_throw_exception(sodium_exception_ce, "public keys must be SODIUM_CRYPTO_KX_PUBLICKEYBYTES bytes", 0);
  		return;
  	}
  	client_sk = &keypair[0];
  	client_pk = &keypair[crypto_kx_SECRETKEYBYTES];
  	(void) sizeof(int[crypto_scalarmult_SCALARBYTES == crypto_kx_PUBLICKEYBYTES ? 1 : -1]);
  	(void) sizeof(int[crypto_scalarmult_SCALARBYTES == crypto_kx_SECRETKEYBYTES ? 1 : -1]);
  	if (crypto_scalarmult(q, client_sk, server_pk) != 0) {
  		zend_throw_exception(sodium_exception_ce, "internal error", 0);
  		return;
  	}
  	crypto_generichash_init(&h, NULL, 0U, 2 * crypto_kx_SESSIONKEYBYTES);
  	crypto_generichash_update(&h, q, sizeof q);
  	sodium_memzero(q, sizeof q);
  	crypto_generichash_update(&h, client_pk, crypto_kx_PUBLICKEYBYTES);
  	crypto_generichash_update(&h, server_pk, crypto_kx_PUBLICKEYBYTES);
  	crypto_generichash_final(&h, session_keys, 2 * crypto_kx_SESSIONKEYBYTES);
  	sodium_memzero(&h, sizeof h);
  	array_init(return_value);
  	add_next_index_stringl(return_value,
  						   (const char *) session_keys,
  						   crypto_kx_SESSIONKEYBYTES);
  	add_next_index_stringl(return_value,
  						   (const char *) session_keys + crypto_kx_SESSIONKEYBYTES,
  						   crypto_kx_SESSIONKEYBYTES);
  }
  
  PHP_FUNCTION(sodium_crypto_kx_server_session_keys)
  {
  	crypto_generichash_state h;
  	unsigned char  q[crypto_scalarmult_BYTES];
  	unsigned char *keypair;
  	unsigned char *server_sk;
  	unsigned char *server_pk;
  	unsigned char *client_pk;
  	unsigned char  session_keys[2 * crypto_kx_SESSIONKEYBYTES];
  	size_t         keypair_len;
  	size_t         client_pk_len;
  
  	if (zend_parse_parameters_throw(ZEND_NUM_ARGS(), "ss",
  									&keypair, &keypair_len,
  									&client_pk, &client_pk_len) == FAILURE) {
  		sodium_remove_param_values_from_backtrace(EG(exception));
  		return;
  	}
  	if (keypair_len != crypto_kx_SECRETKEYBYTES + crypto_kx_PUBLICKEYBYTES) {
  		zend_throw_exception(sodium_exception_ce, "keypair must be SODIUM_CRYPTO_KX_KEYPAIRBYTES bytes", 0);
  		return;
  	}
  	if (client_pk_len != crypto_kx_PUBLICKEYBYTES) {
  		zend_throw_exception(sodium_exception_ce, "public keys must be SODIUM_CRYPTO_KX_PUBLICKEYBYTES bytes", 0);
  		return;
  	}
  	server_sk = &keypair[0];
  	server_pk = &keypair[crypto_kx_SECRETKEYBYTES];
  	(void) sizeof(int[crypto_scalarmult_SCALARBYTES == crypto_kx_PUBLICKEYBYTES ? 1 : -1]);
  	(void) sizeof(int[crypto_scalarmult_SCALARBYTES == crypto_kx_SECRETKEYBYTES ? 1 : -1]);
  	if (crypto_scalarmult(q, server_sk, client_pk) != 0) {
  		zend_throw_exception(sodium_exception_ce, "internal error", 0);
  		return;
  	}
  	crypto_generichash_init(&h, NULL, 0U, 2 * crypto_kx_SESSIONKEYBYTES);
  	crypto_generichash_update(&h, q, sizeof q);
  	sodium_memzero(q, sizeof q);
  	crypto_generichash_update(&h, client_pk, crypto_kx_PUBLICKEYBYTES);
  	crypto_generichash_update(&h, server_pk, crypto_kx_PUBLICKEYBYTES);
  	crypto_generichash_final(&h, session_keys, 2 * crypto_kx_SESSIONKEYBYTES);
  	sodium_memzero(&h, sizeof h);
  	array_init(return_value);
  	add_next_index_stringl(return_value,
  						   (const char *) session_keys + crypto_kx_SESSIONKEYBYTES,
  						   crypto_kx_SESSIONKEYBYTES);
  	add_next_index_stringl(return_value,
  						   (const char *) session_keys,
  						   crypto_kx_SESSIONKEYBYTES);
  }
  
  PHP_FUNCTION(sodium_crypto_auth)
  {
  	zend_string *mac;
  	char        *key;
  	char        *msg;
  	size_t       msg_len;
  	size_t       key_len;
  
  	if (zend_parse_parameters_throw(ZEND_NUM_ARGS(), "ss",
  									&msg, &msg_len,
  									&key, &key_len) == FAILURE) {
  		sodium_remove_param_values_from_backtrace(EG(exception));
  		return;
  	}
  	if (key_len != crypto_auth_KEYBYTES) {
  		zend_throw_exception(sodium_exception_ce, "key must be SODIUM_CRYPTO_AUTH_KEYBYTES bytes", 0);
  		return;
  	}
  	mac = zend_string_alloc(crypto_auth_BYTES, 0);
  	if (crypto_auth((unsigned char *) ZSTR_VAL(mac),
  					(const unsigned char *) msg, msg_len,
  					(const unsigned char *) key) != 0) {
  		zend_throw_exception(sodium_exception_ce, "internal error", 0);
  		return;
  	}
  	ZSTR_VAL(mac)[crypto_auth_BYTES] = 0;
  
  	RETURN_STR(mac);
  }
  
  PHP_FUNCTION(sodium_crypto_auth_verify)
  {
  	char      *mac;
  	char      *key;
  	char      *msg;
  	size_t     mac_len;
  	size_t     msg_len;
  	size_t     key_len;
  
  	if (zend_parse_parameters_throw(ZEND_NUM_ARGS(), "sss",
  									&mac, &mac_len,
  									&msg, &msg_len,
  									&key, &key_len) == FAILURE) {
  		sodium_remove_param_values_from_backtrace(EG(exception));
  		return;
  	}
  	if (key_len != crypto_auth_KEYBYTES) {
  		zend_throw_exception(sodium_exception_ce, "key must be SODIUM_CRYPTO_AUTH_KEYBYTES bytes", 0);
  		return;
  	}
  	if (mac_len != crypto_auth_BYTES) {
  		zend_throw_exception(sodium_exception_ce, "authentication tag must be SODIUM_CRYPTO_AUTH_BYTES bytes", 0);
  		return;
  	}
  	if (crypto_auth_verify((const unsigned char *) mac,
  						   (const unsigned char *) msg, msg_len,
  						   (const unsigned char *) key) != 0) {
  		RETURN_FALSE;
  	}
  	RETURN_TRUE;
  }
  
  PHP_FUNCTION(sodium_crypto_sign_ed25519_sk_to_curve25519)
  {
  	zend_string *ecdhkey;
  	char        *eddsakey;
  	size_t       eddsakey_len;
  
  	if (zend_parse_parameters_throw(ZEND_NUM_ARGS(), "s",
  									&eddsakey, &eddsakey_len) == FAILURE) {
  		sodium_remove_param_values_from_backtrace(EG(exception));
  		return;
  	}
  	if (eddsakey_len != crypto_sign_SECRETKEYBYTES) {
  		zend_throw_exception(sodium_exception_ce,
  				   "Ed25519 key should be SODIUM_CRYPTO_SIGN_SECRETKEYBYTES bytes",
  				   0);
  		return;
  	}
  	ecdhkey = zend_string_alloc(crypto_box_SECRETKEYBYTES, 0);
  
  	if (crypto_sign_ed25519_sk_to_curve25519((unsigned char *) ZSTR_VAL(ecdhkey),
  											 (const unsigned char *) eddsakey) != 0) {
  		zend_throw_exception(sodium_exception_ce, "conversion failed", 0);
  		return;
  	}
  	ZSTR_VAL(ecdhkey)[crypto_box_SECRETKEYBYTES] = 0;
  
  	RETURN_STR(ecdhkey);
  }
  
  PHP_FUNCTION(sodium_crypto_sign_ed25519_pk_to_curve25519)
  {
  	zend_string *ecdhkey;
  	char        *eddsakey;
  	size_t       eddsakey_len;
  
  	if (zend_parse_parameters_throw(ZEND_NUM_ARGS(), "s",
  									&eddsakey, &eddsakey_len) == FAILURE) {
  		sodium_remove_param_values_from_backtrace(EG(exception));
  		return;
  	}
  	if (eddsakey_len != crypto_sign_PUBLICKEYBYTES) {
  		zend_throw_exception(sodium_exception_ce,
  				   "Ed25519 key should be SODIUM_CRYPTO_SIGN_PUBLICKEYBYTES bytes",
  				   0);
  		return;
  	}
  	ecdhkey = zend_string_alloc(crypto_sign_PUBLICKEYBYTES, 0);
  
  	if (crypto_sign_ed25519_pk_to_curve25519((unsigned char *) ZSTR_VAL(ecdhkey),
  											 (const unsigned char *) eddsakey) != 0) {
  		zend_throw_exception(sodium_exception_ce, "conversion failed", 0);
  		return;
  	}
  	ZSTR_VAL(ecdhkey)[crypto_box_PUBLICKEYBYTES] = 0;
  
  	RETURN_STR(ecdhkey);
  }
  
  PHP_FUNCTION(sodium_compare)
  {
  	char      *buf1;
  	char      *buf2;
  	size_t     len1;
  	size_t     len2;
  
  	if (zend_parse_parameters_throw(ZEND_NUM_ARGS(), "ss",
  									&buf1, &len1,
  									&buf2, &len2) == FAILURE) {
  		sodium_remove_param_values_from_backtrace(EG(exception));
  		return;
  	}
  	if (len1 != len2) {
  		zend_throw_exception(sodium_exception_ce, "arguments have different sizes", 0);
  		return;
  	} else {
  		RETURN_LONG(sodium_compare((const unsigned char *) buf1,
  								   (const unsigned char *) buf2, (size_t) len1));
  	}
  }
  
  #ifdef HAVE_AESGCM
  PHP_FUNCTION(sodium_crypto_aead_aes256gcm_keygen)
  {
  	unsigned char key[crypto_aead_aes256gcm_KEYBYTES];
  
  	if (zend_parse_parameters_none() == FAILURE) {
  		return;
  	}
  	randombytes_buf(key, sizeof key);
  	RETURN_STRINGL((const char *) key, sizeof key);
  }
  #endif
  
  PHP_FUNCTION(sodium_crypto_aead_chacha20poly1305_keygen)
  {
  	unsigned char key[crypto_aead_chacha20poly1305_KEYBYTES];
  
  	if (zend_parse_parameters_none() == FAILURE) {
  		return;
  	}
  	randombytes_buf(key, sizeof key);
  	RETURN_STRINGL((const char *) key, sizeof key);
  }
  
  PHP_FUNCTION(sodium_crypto_aead_chacha20poly1305_ietf_keygen)
  {
  	unsigned char key[crypto_aead_chacha20poly1305_IETF_KEYBYTES];
  
  	if (zend_parse_parameters_none() == FAILURE) {
  		return;
  	}
  	randombytes_buf(key, sizeof key);
  	RETURN_STRINGL((const char *) key, sizeof key);
  }
  
  #ifdef crypto_aead_xchacha20poly1305_IETF_NPUBBYTES
  PHP_FUNCTION(sodium_crypto_aead_xchacha20poly1305_ietf_keygen)
  {
  	unsigned char key[crypto_aead_xchacha20poly1305_IETF_KEYBYTES];
  
  	if (zend_parse_parameters_none() == FAILURE) {
  		return;
  	}
  	randombytes_buf(key, sizeof key);
  	RETURN_STRINGL((const char *) key, sizeof key);
  }
  #endif
  
  PHP_FUNCTION(sodium_crypto_auth_keygen)
  {
  	unsigned char key[crypto_auth_KEYBYTES];
  
  	if (zend_parse_parameters_none() == FAILURE) {
  		return;
  	}
  	randombytes_buf(key, sizeof key);
  	RETURN_STRINGL((const char *) key, sizeof key);
  }
  
  PHP_FUNCTION(sodium_crypto_generichash_keygen)
  {
  	unsigned char key[crypto_generichash_KEYBYTES];
  
  	if (zend_parse_parameters_none() == FAILURE) {
  		return;
  	}
  	randombytes_buf(key, sizeof key);
  	RETURN_STRINGL((const char *) key, sizeof key);
  }
  
  PHP_FUNCTION(sodium_crypto_kdf_keygen)
  {
  	unsigned char key[crypto_kdf_KEYBYTES];
  
  	if (zend_parse_parameters_none() == FAILURE) {
  		return;
  	}
  	randombytes_buf(key, sizeof key);
  	RETURN_STRINGL((const char *) key, sizeof key);
  }
  
  PHP_FUNCTION(sodium_crypto_secretbox_keygen)
  {
  	unsigned char key[crypto_secretbox_KEYBYTES];
  
  	if (zend_parse_parameters_none() == FAILURE) {
  		return;
  	}
  	randombytes_buf(key, sizeof key);
  	RETURN_STRINGL((const char *) key, sizeof key);
  }
  
  PHP_FUNCTION(sodium_crypto_shorthash_keygen)
  {
  	unsigned char key[crypto_shorthash_KEYBYTES];
  
  	if (zend_parse_parameters_none() == FAILURE) {
  		return;
  	}
  	randombytes_buf(key, sizeof key);
  	RETURN_STRINGL((const char *) key, sizeof key);
  }
  
  PHP_FUNCTION(sodium_crypto_stream_keygen)
  {
  	unsigned char key[crypto_stream_KEYBYTES];
  
  	if (zend_parse_parameters_none() == FAILURE) {
  		return;
  	}
  	randombytes_buf(key, sizeof key);
  	RETURN_STRINGL((const char *) key, sizeof key);
  }
  
  PHP_FUNCTION(sodium_crypto_kdf_derive_from_key)
  {
  	unsigned char  ctx_padded[crypto_generichash_blake2b_PERSONALBYTES];
  #ifndef crypto_kdf_PRIMITIVE
  	unsigned char  salt[crypto_generichash_blake2b_SALTBYTES];
  #endif
  	char          *ctx;
  	char          *key;
  	zend_string   *subkey;
  	zend_long      subkey_id;
  	zend_long      subkey_len;
  	size_t         ctx_len;
  	size_t         key_len;
  
  	if (zend_parse_parameters_throw(ZEND_NUM_ARGS(), "llss",
  									&subkey_len,
  									&subkey_id,
  									&ctx, &ctx_len,
  									&key, &key_len) == FAILURE) {
  		sodium_remove_param_values_from_backtrace(EG(exception));
  		return;
  	}
  	if (subkey_len < crypto_kdf_BYTES_MIN) {
  		zend_throw_exception(sodium_exception_ce, "subkey cannot be smaller than SODIUM_CRYPTO_KDF_BYTES_MIN", 0);
  		return;
  	}
  	if (subkey_len > crypto_kdf_BYTES_MAX || subkey_len > SIZE_MAX) {
  		zend_throw_exception(sodium_exception_ce, "subkey cannot be larger than SODIUM_CRYPTO_KDF_BYTES_MAX", 0);
  		return;
  	}
  	if (subkey_id < 0) {
  		zend_throw_exception(sodium_exception_ce, "subkey_id cannot be negative", 0);
  		return;
  	}
  	if (ctx_len != crypto_kdf_CONTEXTBYTES) {
  		zend_throw_exception(sodium_exception_ce, "context should be SODIUM_CRYPTO_KDF_CONTEXTBYTES bytes", 0);
  		return;
  	}
  	if (key_len != crypto_kdf_KEYBYTES) {
  		zend_throw_exception(sodium_exception_ce, "key should be SODIUM_CRYPTO_KDF_KEYBYTES bytes", 0);
  		return;
  	}
  	memcpy(ctx_padded, ctx, crypto_kdf_CONTEXTBYTES);
  	memset(ctx_padded + crypto_kdf_CONTEXTBYTES, 0, sizeof ctx_padded - crypto_kdf_CONTEXTBYTES);
  	subkey = zend_string_alloc((size_t) subkey_len, 0);
  #ifdef crypto_kdf_PRIMITIVE
  	crypto_kdf_derive_from_key((unsigned char *) ZSTR_VAL(subkey),
  							   (size_t) subkey_len, (uint64_t) subkey_id,
  							   ctx, (const unsigned char *) key);
  #else
  	salt[0] = (unsigned char) (((uint64_t) subkey_id)      );
  	salt[1] = (unsigned char) (((uint64_t) subkey_id) >>  8);
  	salt[2] = (unsigned char) (((uint64_t) subkey_id) >> 16);
  	salt[3] = (unsigned char) (((uint64_t) subkey_id) >> 24);
  	salt[4] = (unsigned char) (((uint64_t) subkey_id) >> 32);
  	salt[5] = (unsigned char) (((uint64_t) subkey_id) >> 40);
  	salt[6] = (unsigned char) (((uint64_t) subkey_id) >> 48);
  	salt[7] = (unsigned char) (((uint64_t) subkey_id) >> 56);
  	memset(salt + 8, 0, (sizeof salt) - 8);
  	crypto_generichash_blake2b_salt_personal((unsigned char *) ZSTR_VAL(subkey),
  											 (size_t) subkey_len,
  											 NULL, 0,
  											 (const unsigned char *) key,
  											 crypto_kdf_KEYBYTES,
  											 salt, ctx_padded);
  #endif
  	ZSTR_VAL(subkey)[subkey_len] = 0;
  
  	RETURN_STR(subkey);
  }
  
  PHP_FUNCTION(sodium_pad)
  {
  	zend_string    *padded;
  	char           *unpadded;
  	zend_long       blocksize;
  	volatile size_t st;
  	size_t          i, j, k;
  	size_t          unpadded_len;
  	size_t          xpadlen;
  	size_t          xpadded_len;
  
  	if (zend_parse_parameters_throw(ZEND_NUM_ARGS(), "sl",
  									&unpadded, &unpadded_len, &blocksize) == FAILURE) {
  		sodium_remove_param_values_from_backtrace(EG(exception));
  		return;
  	}
  	if (blocksize <= 0) {
  		zend_throw_exception(sodium_exception_ce, "block size cannot be less than 1", 0);
  		return;
  	}
  	if (blocksize > SIZE_MAX) {
  		zend_throw_exception(sodium_exception_ce, "block size is too large", 0);
  		return;
  	}
  	xpadlen = blocksize - 1U;
  	if ((blocksize & (blocksize - 1U)) == 0U) {
  		xpadlen -= unpadded_len & ((size_t) blocksize - 1U);
  	} else {
  		xpadlen -= unpadded_len % (size_t) blocksize;
  	}
  	if ((size_t) SIZE_MAX - unpadded_len <= xpadlen) {
  		zend_throw_exception(sodium_exception_ce, "input is too large", 0);
  		return;
  	}
  	xpadded_len = unpadded_len + xpadlen;
  	padded = zend_string_alloc(xpadded_len + 1U, 0);
  	if (unpadded_len > 0) {
  		st = 1U;
  		i = 0U;
  		k = unpadded_len;
  		for (j = 0U; j <= xpadded_len; j++) {
  			ZSTR_VAL(padded)[j] = unpadded[i];
  			k -= st;
  			st = (size_t) (~(((( (((uint64_t) k) >> 48) | (((uint64_t) k) >> 32) |
  								 (k >> 16) | k) & 0xffff) - 1U) >> 16)) & 1U;
  			i += st;
  		}
  	}
  #if SODIUM_LIBRARY_VERSION_MAJOR > 9 || (SODIUM_LIBRARY_VERSION_MAJOR == 9 && SODIUM_LIBRARY_VERSION_MINOR >= 6)
  	if (sodium_pad(NULL, (unsigned char *) ZSTR_VAL(padded), unpadded_len,
  				   (size_t) blocksize, xpadded_len + 1U) != 0) {
  		zend_throw_exception(sodium_exception_ce, "internal error", 0);
  		return;
  	}
  #else
  	{
  		char                   *tail;
  		volatile unsigned char  mask;
  		unsigned char           barrier_mask;
  
  		tail = &ZSTR_VAL(padded)[xpadded_len];
  		mask = 0U;
  		for (i = 0; i < blocksize; i++) {
  			barrier_mask = (unsigned char)
  				(((i ^ xpadlen) - 1U) >> ((sizeof(size_t) - 1U) * CHAR_BIT));
  			tail[-i] = (tail[-i] & mask) | (0x80 & barrier_mask);
  			mask |= barrier_mask;
  		}
  	}
  #endif
  	ZSTR_VAL(padded)[xpadded_len + 1U] = 0;
  
  	RETURN_STR(padded);
  }
  
  PHP_FUNCTION(sodium_unpad)
  {
  	zend_string *unpadded;
  	char        *padded;
  	size_t       padded_len;
  	size_t       unpadded_len;
  	zend_long    blocksize;
  	int          ret;
  
  	if (zend_parse_parameters_throw(ZEND_NUM_ARGS(), "sl",
  									&padded, &padded_len, &blocksize) == FAILURE) {
  		sodium_remove_param_values_from_backtrace(EG(exception));
  		return;
  	}
  	if (blocksize <= 0) {
  		zend_throw_exception(sodium_exception_ce, "block size cannot be less than 1", 0);
  		return;
  	}
  	if (blocksize > SIZE_MAX) {
  		zend_throw_exception(sodium_exception_ce, "block size is too large", 0);
  		return;
  	}
  	if (padded_len < blocksize) {
  		zend_throw_exception(sodium_exception_ce, "invalid padding", 0);
  		return;
  	}
  
  #if SODIUM_LIBRARY_VERSION_MAJOR > 9 || (SODIUM_LIBRARY_VERSION_MAJOR == 9 && SODIUM_LIBRARY_VERSION_MINOR >= 6)
  	ret = sodium_unpad(&unpadded_len, (const unsigned char *) padded,
  					   padded_len, (size_t) blocksize);
  #else
  	{
  		const char      *tail;
  		unsigned char    acc = 0U;
  		unsigned char    c;
  		unsigned char    valid = 0U;
  		volatile size_t  pad_len = 0U;
  		size_t           i;
  		size_t           is_barrier;
  
  		tail = &padded[padded_len - 1U];
  
  		for (i = 0U; i < (size_t) blocksize; i++) {
  			c = tail[-i];
  			is_barrier =
  				(( (acc - 1U) & (pad_len - 1U) & ((c ^ 0x80) - 1U) ) >> 8) & 1U;
  			acc |= c;
  			pad_len |= i & (1U + ~is_barrier);
  			valid |= (unsigned char) is_barrier;
  		}
  		unpadded_len = padded_len - 1U - pad_len;
  		ret = (int) (valid - 1U);
  	}
  #endif
  	if (ret != 0 || unpadded_len > LONG_MAX) {
  		zend_throw_exception(sodium_exception_ce, "invalid padding", 0);
  		return;
  	}
  	unpadded = zend_string_init(padded, padded_len, 0);
  	PHP_SODIUM_ZSTR_TRUNCATE(unpadded, unpadded_len);
  	ZSTR_VAL(unpadded)[unpadded_len] = 0;
  	RETURN_STR(unpadded);
  }
  
  #ifdef crypto_secretstream_xchacha20poly1305_ABYTES
  PHP_FUNCTION(sodium_crypto_secretstream_xchacha20poly1305_keygen)
  {
  	unsigned char key[crypto_secretstream_xchacha20poly1305_KEYBYTES];
  
  	if (zend_parse_parameters_none() == FAILURE) {
  		return;
  	}
  	randombytes_buf(key, sizeof key);
  	RETURN_STRINGL((const char *) key, sizeof key);
  }
  
  PHP_FUNCTION(sodium_crypto_secretstream_xchacha20poly1305_init_push)
  {
  	crypto_secretstream_xchacha20poly1305_state  state;
  	unsigned char                                header[crypto_secretstream_xchacha20poly1305_HEADERBYTES];
  	unsigned char                               *key;
  	size_t                                       key_len;
  
  	if (zend_parse_parameters_throw(ZEND_NUM_ARGS(), "s",
  									&key, &key_len) == FAILURE) {
  		sodium_remove_param_values_from_backtrace(EG(exception));
  		return;
  	}
  	if (key_len != crypto_secretstream_xchacha20poly1305_KEYBYTES) {
  		zend_throw_exception(sodium_exception_ce,
  				   "key size should be SODIUM_CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_KEYBYTES bytes",
  				   0);
  		return;
  	}
  	if (crypto_secretstream_xchacha20poly1305_init_push(&state,
  														header, key) != 0) {
  		zend_throw_exception(sodium_exception_ce, "internal error", 0);
  		return;
  	}
  	array_init(return_value);
  	add_next_index_stringl(return_value, (const char *) &state, sizeof state);
  	add_next_index_stringl(return_value, (const char *) header, sizeof header);
  }
  
  PHP_FUNCTION(sodium_crypto_secretstream_xchacha20poly1305_push)
  {
  	zval               *state_zv;
  	zend_string        *c;
  	unsigned char      *ad = NULL;
  	unsigned char      *msg;
  	unsigned char      *state;
  	unsigned long long  c_real_len;
  	zend_long           tag = crypto_secretstream_xchacha20poly1305_TAG_MESSAGE;
  	size_t              ad_len = (size_t) 0U;
  	size_t              c_len;
  	size_t              msg_len;
  	size_t              state_len;
  
  	if (zend_parse_parameters_throw(ZEND_NUM_ARGS(), "zs|sl",
  									&state_zv,
  									&msg, &msg_len, &ad, &ad_len, &tag) == FAILURE) {
  		sodium_remove_param_values_from_backtrace(EG(exception));
  		return;
  	}
  	ZVAL_DEREF(state_zv);
  	if (Z_TYPE_P(state_zv) != IS_STRING) {
  		zend_throw_exception(sodium_exception_ce, "a reference to a state is required", 0);
  		return;
  	}
  	sodium_separate_string(state_zv);
  	state = (unsigned char *) Z_STRVAL(*state_zv);
  	state_len = Z_STRLEN(*state_zv);
  	if (state_len != sizeof (crypto_secretstream_xchacha20poly1305_state)) {
  		zend_throw_exception(sodium_exception_ce, "incorrect state length", 0);
  		return;
  	}
  	if (msg_len > crypto_secretstream_xchacha20poly1305_MESSAGEBYTES_MAX ||
  		msg_len > SIZE_MAX - crypto_secretstream_xchacha20poly1305_ABYTES) {
  		zend_throw_exception(sodium_exception_ce, "message cannot be larger than SODIUM_CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_MESSAGEBYTES_MAX bytes", 0);
  		return;
  	}
  	if (tag < 0 || tag > 255) {
  		zend_throw_exception(sodium_exception_ce, "unsupported value for the tag", 0);
  		return;
  	}
  	c_len = msg_len + crypto_secretstream_xchacha20poly1305_ABYTES;
  	c = zend_string_alloc((size_t) c_len, 0);
  	if (crypto_secretstream_xchacha20poly1305_push
  		((void *) state, (unsigned char *) ZSTR_VAL(c), &c_real_len,
  		 msg, (unsigned long long) msg_len, ad, (unsigned long long) ad_len,
  		 (unsigned char) tag) != 0) {
  		zend_string_efree(c);
  		zend_throw_exception(sodium_exception_ce, "internal error", 0);
  		return;
  	}
  	if (c_real_len <= 0U || c_real_len >= SIZE_MAX || c_real_len > c_len) {
  		zend_string_efree(c);
  		zend_throw_exception(sodium_exception_ce, "arithmetic overflow", 0);
  		return;
  	}
  	PHP_SODIUM_ZSTR_TRUNCATE(c, (size_t) c_real_len);
  	ZSTR_VAL(c)[c_real_len] = 0;
  
  	RETURN_NEW_STR(c);
  }
  
  PHP_FUNCTION(sodium_crypto_secretstream_xchacha20poly1305_init_pull)
  {
  	crypto_secretstream_xchacha20poly1305_state  state;
  	unsigned char                               *header;
  	unsigned char                               *key;
  	size_t                                       header_len;
  	size_t                                       key_len;
  
  	if (zend_parse_parameters_throw(ZEND_NUM_ARGS(), "ss",
  									&header, &header_len,
  									&key, &key_len) == FAILURE) {
  		sodium_remove_param_values_from_backtrace(EG(exception));
  		return;
  	}
  	if (header_len != crypto_secretstream_xchacha20poly1305_HEADERBYTES) {
  		zend_throw_exception(sodium_exception_ce,
  				   "header size should be SODIUM_CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_HEADERBYTES bytes",
  				   0);
  		return;
  	}
  	if (key_len != crypto_secretstream_xchacha20poly1305_KEYBYTES) {
  		zend_throw_exception(sodium_exception_ce,
  				   "key size should be SODIUM_CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_KEYBYTES bytes",
  				   0);
  		return;
  	}
  	if (crypto_secretstream_xchacha20poly1305_init_pull(&state,
  														header, key) != 0) {
  		zend_throw_exception(sodium_exception_ce, "internal error", 0);
  		return;
  	}
  	RETURN_STRINGL((const char *) &state, sizeof state);
  }
  
  PHP_FUNCTION(sodium_crypto_secretstream_xchacha20poly1305_pull)
  {
  	zval               *state_zv;
  	zend_string        *msg;
  	unsigned char      *ad = NULL;
  	unsigned char      *c;
  	unsigned char      *state;
  	unsigned long long  msg_real_len;
  	size_t              ad_len = (size_t) 0U;
  	size_t              msg_len;
  	size_t              c_len;
  	size_t              state_len;
  	unsigned char       tag;
  
  	if (zend_parse_parameters_throw(ZEND_NUM_ARGS(), "zs|s",
  									&state_zv,
  									&c, &c_len, &ad, &ad_len) == FAILURE) {
  		sodium_remove_param_values_from_backtrace(EG(exception));
  		return;
  	}
  	ZVAL_DEREF(state_zv);
  	if (Z_TYPE_P(state_zv) != IS_STRING) {
  		zend_throw_exception(sodium_exception_ce, "a reference to a state is required", 0);
  		return;
  	}
  	sodium_separate_string(state_zv);
  	state = (unsigned char *) Z_STRVAL(*state_zv);
  	state_len = Z_STRLEN(*state_zv);
  	if (state_len != sizeof (crypto_secretstream_xchacha20poly1305_state)) {
  		zend_throw_exception(sodium_exception_ce, "incorrect state length", 0);
  		return;
  	}
  	if (c_len < crypto_secretstream_xchacha20poly1305_ABYTES) {
  		RETURN_FALSE;
  	}
  	msg_len = c_len - crypto_secretstream_xchacha20poly1305_ABYTES;
  	msg = zend_string_alloc((size_t) msg_len, 0);
  	if (crypto_secretstream_xchacha20poly1305_pull
  		((void *) state, (unsigned char *) ZSTR_VAL(msg), &msg_real_len, &tag,
  		 c, (unsigned long long) c_len, ad, (unsigned long long) ad_len) != 0) {
  		zend_string_efree(msg);
  		RETURN_FALSE;
  	}
  	if (msg_real_len >= SIZE_MAX || msg_real_len > msg_len) {
  		zend_string_efree(msg);
  		zend_throw_exception(sodium_exception_ce, "arithmetic overflow", 0);
  		return;
  	}
  	PHP_SODIUM_ZSTR_TRUNCATE(msg, (size_t) msg_real_len);
  	ZSTR_VAL(msg)[msg_real_len] = 0;
  	array_init(return_value);
  	add_next_index_str(return_value, msg);
  	add_next_index_long(return_value, (long) tag);
  }
  
  PHP_FUNCTION(sodium_crypto_secretstream_xchacha20poly1305_rekey)
  {
  	zval          *state_zv;
  	unsigned char *state;
  	size_t         state_len;
  
  	if (zend_parse_parameters_throw(ZEND_NUM_ARGS(), "z", &state_zv) == FAILURE) {
  		sodium_remove_param_values_from_backtrace(EG(exception));
  		return;
  	}
  	ZVAL_DEREF(state_zv);
  	if (Z_TYPE_P(state_zv) != IS_STRING) {
  		zend_throw_exception(sodium_exception_ce, "a reference to a state is required", 0);
  		return;
  	}
  	sodium_separate_string(state_zv);
  	state = (unsigned char *) Z_STRVAL(*state_zv);
  	state_len = Z_STRLEN(*state_zv);
  	if (state_len != sizeof (crypto_secretstream_xchacha20poly1305_state)) {
  		zend_throw_exception(sodium_exception_ce, "incorrect state length", 0);
  		return;
  	}
  	crypto_secretstream_xchacha20poly1305_rekey((void *) state);
  }
  #endif
  