text: /*
   * Copyright 2015-2018 The OpenSSL Project Authors. All Rights Reserved.
   *
   * Licensed under the Apache License 2.0 (the "License").  You may not use
   * this file except in compliance with the License.  You can obtain a copy
   * in the file LICENSE in the source distribution or at
   * https://www.openssl.org/source/license.html
   */
  
  #include <openssl/evp.h>
  #include <openssl/core_numbers.h>
  #include "internal/refcount.h"
  
  /*
   * Don't free up md_ctx->pctx in EVP_MD_CTX_reset, use the reserved flag
   * values in evp.h
   */
  #define EVP_MD_CTX_FLAG_KEEP_PKEY_CTX   0x0400
  
  struct evp_pkey_ctx_st {
      EVP_KEYEXCH *exchange;
      void *exchprovctx;
  
      /* Legacy fields below */
  
      /* Method associated with this operation */
      const EVP_PKEY_METHOD *pmeth;
      /* Engine that implements this method or NULL if builtin */
      ENGINE *engine;
      /* Key: may be NULL */
      EVP_PKEY *pkey;
      /* Peer key for key agreement, may be NULL */
      EVP_PKEY *peerkey;
      /* Actual operation */
      int operation;
      /* Algorithm specific data */
      void *data;
      /* Application specific data */
      void *app_data;
      /* Keygen callback */
      EVP_PKEY_gen_cb *pkey_gencb;
      /* implementation specific keygen data */
      int *keygen_info;
      int keygen_info_count;
  } /* EVP_PKEY_CTX */ ;
  
  #define EVP_PKEY_FLAG_DYNAMIC   1
  
  struct evp_pkey_method_st {
      int pkey_id;
      int flags;
      int (*init) (EVP_PKEY_CTX *ctx);
      int (*copy) (EVP_PKEY_CTX *dst, const EVP_PKEY_CTX *src);
      void (*cleanup) (EVP_PKEY_CTX *ctx);
      int (*paramgen_init) (EVP_PKEY_CTX *ctx);
      int (*paramgen) (EVP_PKEY_CTX *ctx, EVP_PKEY *pkey);
      int (*keygen_init) (EVP_PKEY_CTX *ctx);
      int (*keygen) (EVP_PKEY_CTX *ctx, EVP_PKEY *pkey);
      int (*sign_init) (EVP_PKEY_CTX *ctx);
      int (*sign) (EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
                   const unsigned char *tbs, size_t tbslen);
      int (*verify_init) (EVP_PKEY_CTX *ctx);
      int (*verify) (EVP_PKEY_CTX *ctx,
                     const unsigned char *sig, size_t siglen,
                     const unsigned char *tbs, size_t tbslen);
      int (*verify_recover_init) (EVP_PKEY_CTX *ctx);
      int (*verify_recover) (EVP_PKEY_CTX *ctx,
                             unsigned char *rout, size_t *routlen,
                             const unsigned char *sig, size_t siglen);
      int (*signctx_init) (EVP_PKEY_CTX *ctx, EVP_MD_CTX *mctx);
      int (*signctx) (EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
                      EVP_MD_CTX *mctx);
      int (*verifyctx_init) (EVP_PKEY_CTX *ctx, EVP_MD_CTX *mctx);
      int (*verifyctx) (EVP_PKEY_CTX *ctx, const unsigned char *sig, int siglen,
                        EVP_MD_CTX *mctx);
      int (*encrypt_init) (EVP_PKEY_CTX *ctx);
      int (*encrypt) (EVP_PKEY_CTX *ctx, unsigned char *out, size_t *outlen,
                      const unsigned char *in, size_t inlen);
      int (*decrypt_init) (EVP_PKEY_CTX *ctx);
      int (*decrypt) (EVP_PKEY_CTX *ctx, unsigned char *out, size_t *outlen,
                      const unsigned char *in, size_t inlen);
      int (*derive_init) (EVP_PKEY_CTX *ctx);
      int (*derive) (EVP_PKEY_CTX *ctx, unsigned char *key, size_t *keylen);
      int (*ctrl) (EVP_PKEY_CTX *ctx, int type, int p1, void *p2);
      int (*ctrl_str) (EVP_PKEY_CTX *ctx, const char *type, const char *value);
      int (*digestsign) (EVP_MD_CTX *ctx, unsigned char *sig, size_t *siglen,
                         const unsigned char *tbs, size_t tbslen);
      int (*digestverify) (EVP_MD_CTX *ctx, const unsigned char *sig,
                           size_t siglen, const unsigned char *tbs,
                           size_t tbslen);
      int (*check) (EVP_PKEY *pkey);
      int (*public_check) (EVP_PKEY *pkey);
      int (*param_check) (EVP_PKEY *pkey);
  
      int (*digest_custom) (EVP_PKEY_CTX *ctx, EVP_MD_CTX *mctx);
  } /* EVP_PKEY_METHOD */ ;
  
  DEFINE_STACK_OF_CONST(EVP_PKEY_METHOD)
  
  void evp_pkey_set_cb_translate(BN_GENCB *cb, EVP_PKEY_CTX *ctx);
  
  extern const EVP_PKEY_METHOD cmac_pkey_meth;
  extern const EVP_PKEY_METHOD dh_pkey_meth;
  extern const EVP_PKEY_METHOD dhx_pkey_meth;
  extern const EVP_PKEY_METHOD dsa_pkey_meth;
  extern const EVP_PKEY_METHOD ec_pkey_meth;
  extern const EVP_PKEY_METHOD sm2_pkey_meth;
  extern const EVP_PKEY_METHOD ecx25519_pkey_meth;
  extern const EVP_PKEY_METHOD ecx448_pkey_meth;
  extern const EVP_PKEY_METHOD ed25519_pkey_meth;
  extern const EVP_PKEY_METHOD ed448_pkey_meth;
  extern const EVP_PKEY_METHOD hmac_pkey_meth;
  extern const EVP_PKEY_METHOD rsa_pkey_meth;
  extern const EVP_PKEY_METHOD rsa_pss_pkey_meth;
  extern const EVP_PKEY_METHOD scrypt_pkey_meth;
  extern const EVP_PKEY_METHOD tls1_prf_pkey_meth;
  extern const EVP_PKEY_METHOD hkdf_pkey_meth;
  extern const EVP_PKEY_METHOD poly1305_pkey_meth;
  extern const EVP_PKEY_METHOD siphash_pkey_meth;
  
  /* struct evp_mac_impl_st is defined by the implementation */
  typedef struct evp_mac_impl_st EVP_MAC_IMPL;
  struct evp_mac_st {
      int type;
      EVP_MAC_IMPL *(*new) (void);
      EVP_MAC_IMPL *(*dup) (const EVP_MAC_IMPL *macsrc);
      void (*free) (EVP_MAC_IMPL *macctx);
      size_t (*size) (EVP_MAC_IMPL *macctx);
      int (*init) (EVP_MAC_IMPL *macctx);
      int (*update) (EVP_MAC_IMPL *macctx, const unsigned char *data,
                     size_t datalen);
      int (*final) (EVP_MAC_IMPL *macctx, unsigned char *out);
      int (*ctrl) (EVP_MAC_IMPL *macctx, int cmd, va_list args);
      int (*ctrl_str) (EVP_MAC_IMPL *macctx, const char *type, const char *value);
  };
  
  extern const EVP_MAC blake2b_mac_meth;
  extern const EVP_MAC blake2s_mac_meth;
  extern const EVP_MAC cmac_meth;
  extern const EVP_MAC gmac_meth;
  extern const EVP_MAC hmac_meth;
  extern const EVP_MAC kmac128_meth;
  extern const EVP_MAC kmac256_meth;
  extern const EVP_MAC siphash_meth;
  extern const EVP_MAC poly1305_meth;
  
  /* Internal keccak algorithms used for KMAC */
  const EVP_MD *evp_keccak_kmac128(void);
  const EVP_MD *evp_keccak_kmac256(void);
  
  /*
   * This function is internal for now, but can be made external when needed.
   * The documentation would read:
   *
   * EVP_add_mac() adds the MAC implementation C<mac> to the internal
   * object database.
   */
  int EVP_add_mac(const EVP_MAC *mac);
  int EVP_add_kdf(const EVP_KDF *kdf);
  
  /* struct evp_kdf_impl_st is defined by the implementation */
  typedef struct evp_kdf_impl_st EVP_KDF_IMPL;
  struct evp_kdf_st {
      int type;
      EVP_KDF_IMPL *(*new) (void);
      void (*free) (EVP_KDF_IMPL *impl);
      void (*reset) (EVP_KDF_IMPL *impl);
      int (*ctrl) (EVP_KDF_IMPL *impl, int cmd, va_list args);
      int (*ctrl_str) (EVP_KDF_IMPL *impl, const char *type, const char *value);
      size_t (*size) (EVP_KDF_IMPL *impl);
      int (*derive) (EVP_KDF_IMPL *impl, unsigned char *key, size_t keylen);
  };
  
  extern const EVP_KDF pbkdf2_kdf_meth;
  extern const EVP_KDF scrypt_kdf_meth;
  extern const EVP_KDF tls1_prf_kdf_meth;
  extern const EVP_KDF hkdf_kdf_meth;
  extern const EVP_KDF sshkdf_kdf_meth;
  extern const EVP_KDF ss_kdf_meth;
  extern const EVP_KDF x963_kdf_meth;
  extern const EVP_KDF x942_kdf_meth;
  
  struct evp_md_st {
      /* nid */
      int type;
  
      /* Legacy structure members */
      /* TODO(3.0): Remove these */
      int pkey_type;
      int md_size;
      unsigned long flags;
      int (*init) (EVP_MD_CTX *ctx);
      int (*update) (EVP_MD_CTX *ctx, const void *data, size_t count);
      int (*final) (EVP_MD_CTX *ctx, unsigned char *md);
      int (*copy) (EVP_MD_CTX *to, const EVP_MD_CTX *from);
      int (*cleanup) (EVP_MD_CTX *ctx);
      int block_size;
      int ctx_size;               /* how big does the ctx->md_data need to be */
      /* control function */
      int (*md_ctrl) (EVP_MD_CTX *ctx, int cmd, int p1, void *p2);
  
      /* New structure members */
      /* TODO(3.0): Remove above comment when legacy has gone */
      char *name;
      OSSL_PROVIDER *prov;
      CRYPTO_REF_COUNT refcnt;
      CRYPTO_RWLOCK *lock;
      OSSL_OP_digest_newctx_fn *newctx;
      OSSL_OP_digest_init_fn *dinit;
      OSSL_OP_digest_update_fn *dupdate;
      OSSL_OP_digest_final_fn *dfinal;
      OSSL_OP_digest_digest_fn *digest;
      OSSL_OP_digest_freectx_fn *freectx;
      OSSL_OP_digest_dupctx_fn *dupctx;
      OSSL_OP_digest_get_params_fn *get_params;
      OSSL_OP_digest_ctx_set_params_fn *ctx_set_params;
      OSSL_OP_digest_ctx_get_params_fn *ctx_get_params;
  
  } /* EVP_MD */ ;
  
  struct evp_cipher_st {
      int nid;
  
      int block_size;
      /* Default value for variable length ciphers */
      int key_len;
      int iv_len;
  
      /* Legacy structure members */
      /* TODO(3.0): Remove these */
      /* Various flags */
      unsigned long flags;
      /* init key */
      int (*init) (EVP_CIPHER_CTX *ctx, const unsigned char *key,
                   const unsigned char *iv, int enc);
      /* encrypt/decrypt data */
      int (*do_cipher) (EVP_CIPHER_CTX *ctx, unsigned char *out,
                        const unsigned char *in, size_t inl);
      /* cleanup ctx */
      int (*cleanup) (EVP_CIPHER_CTX *);
      /* how big ctx->cipher_data needs to be */
      int ctx_size;
      /* Populate a ASN1_TYPE with parameters */
      int (*set_asn1_parameters) (EVP_CIPHER_CTX *, ASN1_TYPE *);
      /* Get parameters from a ASN1_TYPE */
      int (*get_asn1_parameters) (EVP_CIPHER_CTX *, ASN1_TYPE *);
      /* Miscellaneous operations */
      int (*ctrl) (EVP_CIPHER_CTX *, int type, int arg, void *ptr);
      /* Application data */
      void *app_data;
  
      /* New structure members */
      /* TODO(3.0): Remove above comment when legacy has gone */
      char *name;
      OSSL_PROVIDER *prov;
      CRYPTO_REF_COUNT refcnt;
      CRYPTO_RWLOCK *lock;
      OSSL_OP_cipher_newctx_fn *newctx;
      OSSL_OP_cipher_encrypt_init_fn *einit;
      OSSL_OP_cipher_decrypt_init_fn *dinit;
      OSSL_OP_cipher_update_fn *cupdate;
      OSSL_OP_cipher_final_fn *cfinal;
      OSSL_OP_cipher_cipher_fn *ccipher;
      OSSL_OP_cipher_freectx_fn *freectx;
      OSSL_OP_cipher_dupctx_fn *dupctx;
      OSSL_OP_cipher_get_params_fn *get_params;
      OSSL_OP_cipher_ctx_get_params_fn *ctx_get_params;
      OSSL_OP_cipher_ctx_set_params_fn *ctx_set_params;
  } /* EVP_CIPHER */ ;
  
  /* Macros to code block cipher wrappers */
  
  /* Wrapper functions for each cipher mode */
  
  #define EVP_C_DATA(kstruct, ctx) \
          ((kstruct *)EVP_CIPHER_CTX_get_cipher_data(ctx))
  
  #define BLOCK_CIPHER_ecb_loop() \
          size_t i, bl; \
          bl = EVP_CIPHER_CTX_cipher(ctx)->block_size;    \
          if (inl < bl) return 1;\
          inl -= bl; \
          for (i=0; i <= inl; i+=bl)
  
  #define BLOCK_CIPHER_func_ecb(cname, cprefix, kstruct, ksched) \
  static int cname##_ecb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, const unsigned char *in, size_t inl) \
  {\
          BLOCK_CIPHER_ecb_loop() \
              cprefix##_ecb_encrypt(in + i, out + i, &EVP_C_DATA(kstruct,ctx)->ksched, EVP_CIPHER_CTX_encrypting(ctx)); \
          return 1;\
  }
  
  #define EVP_MAXCHUNK ((size_t)1<<(sizeof(long)*8-2))
  
  #define BLOCK_CIPHER_func_ofb(cname, cprefix, cbits, kstruct, ksched) \
      static int cname##_ofb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, const unsigned char *in, size_t inl) \
  {\
          while(inl>=EVP_MAXCHUNK) {\
              int num = EVP_CIPHER_CTX_num(ctx);\
              cprefix##_ofb##cbits##_encrypt(in, out, (long)EVP_MAXCHUNK, &EVP_C_DATA(kstruct,ctx)->ksched, EVP_CIPHER_CTX_iv_noconst(ctx), &num); \
              EVP_CIPHER_CTX_set_num(ctx, num);\
              inl-=EVP_MAXCHUNK;\
              in +=EVP_MAXCHUNK;\
              out+=EVP_MAXCHUNK;\
          }\
          if (inl) {\
              int num = EVP_CIPHER_CTX_num(ctx);\
              cprefix##_ofb##cbits##_encrypt(in, out, (long)inl, &EVP_C_DATA(kstruct,ctx)->ksched, EVP_CIPHER_CTX_iv_noconst(ctx), &num); \
              EVP_CIPHER_CTX_set_num(ctx, num);\
          }\
          return 1;\
  }
  
  #define BLOCK_CIPHER_func_cbc(cname, cprefix, kstruct, ksched) \
  static int cname##_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, const unsigned char *in, size_t inl) \
  {\
          while(inl>=EVP_MAXCHUNK) \
              {\
              cprefix##_cbc_encrypt(in, out, (long)EVP_MAXCHUNK, &EVP_C_DATA(kstruct,ctx)->ksched, EVP_CIPHER_CTX_iv_noconst(ctx), EVP_CIPHER_CTX_encrypting(ctx));\
              inl-=EVP_MAXCHUNK;\
              in +=EVP_MAXCHUNK;\
              out+=EVP_MAXCHUNK;\
              }\
          if (inl)\
              cprefix##_cbc_encrypt(in, out, (long)inl, &EVP_C_DATA(kstruct,ctx)->ksched, EVP_CIPHER_CTX_iv_noconst(ctx), EVP_CIPHER_CTX_encrypting(ctx));\
          return 1;\
  }
  
  #define BLOCK_CIPHER_func_cfb(cname, cprefix, cbits, kstruct, ksched)  \
  static int cname##_cfb##cbits##_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, const unsigned char *in, size_t inl) \
  {\
      size_t chunk = EVP_MAXCHUNK;\
      if (cbits == 1)  chunk >>= 3;\
      if (inl < chunk) chunk = inl;\
      while (inl && inl >= chunk)\
      {\
          int num = EVP_CIPHER_CTX_num(ctx);\
          cprefix##_cfb##cbits##_encrypt(in, out, (long) \
              ((cbits == 1) \
                  && !EVP_CIPHER_CTX_test_flags(ctx, EVP_CIPH_FLAG_LENGTH_BITS) \
                  ? chunk*8 : chunk), \
              &EVP_C_DATA(kstruct, ctx)->ksched, EVP_CIPHER_CTX_iv_noconst(ctx),\
              &num, EVP_CIPHER_CTX_encrypting(ctx));\
          EVP_CIPHER_CTX_set_num(ctx, num);\
          inl -= chunk;\
          in += chunk;\
          out += chunk;\
          if (inl < chunk) chunk = inl;\
      }\
      return 1;\
  }
  
  #define BLOCK_CIPHER_all_funcs(cname, cprefix, cbits, kstruct, ksched) \
          BLOCK_CIPHER_func_cbc(cname, cprefix, kstruct, ksched) \
          BLOCK_CIPHER_func_cfb(cname, cprefix, cbits, kstruct, ksched) \
          BLOCK_CIPHER_func_ecb(cname, cprefix, kstruct, ksched) \
          BLOCK_CIPHER_func_ofb(cname, cprefix, cbits, kstruct, ksched)
  
  #define BLOCK_CIPHER_def1(cname, nmode, mode, MODE, kstruct, nid, block_size, \
                            key_len, iv_len, flags, init_key, cleanup, \
                            set_asn1, get_asn1, ctrl) \
  static const EVP_CIPHER cname##_##mode = { \
          nid##_##nmode, block_size, key_len, iv_len, \
          flags | EVP_CIPH_##MODE##_MODE, \
          init_key, \
          cname##_##mode##_cipher, \
          cleanup, \
          sizeof(kstruct), \
          set_asn1, get_asn1,\
          ctrl, \
          NULL \
  }; \
  const EVP_CIPHER *EVP_##cname##_##mode(void) { return &cname##_##mode; }
  
  #define BLOCK_CIPHER_def_cbc(cname, kstruct, nid, block_size, key_len, \
                               iv_len, flags, init_key, cleanup, set_asn1, \
                               get_asn1, ctrl) \
  BLOCK_CIPHER_def1(cname, cbc, cbc, CBC, kstruct, nid, block_size, key_len, \
                    iv_len, flags, init_key, cleanup, set_asn1, get_asn1, ctrl)
  
  #define BLOCK_CIPHER_def_cfb(cname, kstruct, nid, key_len, \
                               iv_len, cbits, flags, init_key, cleanup, \
                               set_asn1, get_asn1, ctrl) \
  BLOCK_CIPHER_def1(cname, cfb##cbits, cfb##cbits, CFB, kstruct, nid, 1, \
                    key_len, iv_len, flags, init_key, cleanup, set_asn1, \
                    get_asn1, ctrl)
  
  #define BLOCK_CIPHER_def_ofb(cname, kstruct, nid, key_len, \
                               iv_len, cbits, flags, init_key, cleanup, \
                               set_asn1, get_asn1, ctrl) \
  BLOCK_CIPHER_def1(cname, ofb##cbits, ofb, OFB, kstruct, nid, 1, \
                    key_len, iv_len, flags, init_key, cleanup, set_asn1, \
                    get_asn1, ctrl)
  
  #define BLOCK_CIPHER_def_ecb(cname, kstruct, nid, block_size, key_len, \
                               flags, init_key, cleanup, set_asn1, \
                               get_asn1, ctrl) \
  BLOCK_CIPHER_def1(cname, ecb, ecb, ECB, kstruct, nid, block_size, key_len, \
                    0, flags, init_key, cleanup, set_asn1, get_asn1, ctrl)
  
  #define BLOCK_CIPHER_defs(cname, kstruct, \
                            nid, block_size, key_len, iv_len, cbits, flags, \
                            init_key, cleanup, set_asn1, get_asn1, ctrl) \
  BLOCK_CIPHER_def_cbc(cname, kstruct, nid, block_size, key_len, iv_len, flags, \
                       init_key, cleanup, set_asn1, get_asn1, ctrl) \
  BLOCK_CIPHER_def_cfb(cname, kstruct, nid, key_len, iv_len, cbits, \
                       flags, init_key, cleanup, set_asn1, get_asn1, ctrl) \
  BLOCK_CIPHER_def_ofb(cname, kstruct, nid, key_len, iv_len, cbits, \
                       flags, init_key, cleanup, set_asn1, get_asn1, ctrl) \
  BLOCK_CIPHER_def_ecb(cname, kstruct, nid, block_size, key_len, flags, \
                       init_key, cleanup, set_asn1, get_asn1, ctrl)
  
  /*-
  #define BLOCK_CIPHER_defs(cname, kstruct, \
                                  nid, block_size, key_len, iv_len, flags,\
                                   init_key, cleanup, set_asn1, get_asn1, ctrl)\
  static const EVP_CIPHER cname##_cbc = {\
          nid##_cbc, block_size, key_len, iv_len, \
          flags | EVP_CIPH_CBC_MODE,\
          init_key,\
          cname##_cbc_cipher,\
          cleanup,\
          sizeof(EVP_CIPHER_CTX)-sizeof((((EVP_CIPHER_CTX *)NULL)->c))+\
                  sizeof((((EVP_CIPHER_CTX *)NULL)->c.kstruct)),\
          set_asn1, get_asn1,\
          ctrl, \
          NULL \
  };\
  const EVP_CIPHER *EVP_##cname##_cbc(void) { return &cname##_cbc; }\
  static const EVP_CIPHER cname##_cfb = {\
          nid##_cfb64, 1, key_len, iv_len, \
          flags | EVP_CIPH_CFB_MODE,\
          init_key,\
          cname##_cfb_cipher,\
          cleanup,\
          sizeof(EVP_CIPHER_CTX)-sizeof((((EVP_CIPHER_CTX *)NULL)->c))+\
                  sizeof((((EVP_CIPHER_CTX *)NULL)->c.kstruct)),\
          set_asn1, get_asn1,\
          ctrl,\
          NULL \
  };\
  const EVP_CIPHER *EVP_##cname##_cfb(void) { return &cname##_cfb; }\
  static const EVP_CIPHER cname##_ofb = {\
          nid##_ofb64, 1, key_len, iv_len, \
          flags | EVP_CIPH_OFB_MODE,\
          init_key,\
          cname##_ofb_cipher,\
          cleanup,\
          sizeof(EVP_CIPHER_CTX)-sizeof((((EVP_CIPHER_CTX *)NULL)->c))+\
                  sizeof((((EVP_CIPHER_CTX *)NULL)->c.kstruct)),\
          set_asn1, get_asn1,\
          ctrl,\
          NULL \
  };\
  const EVP_CIPHER *EVP_##cname##_ofb(void) { return &cname##_ofb; }\
  static const EVP_CIPHER cname##_ecb = {\
          nid##_ecb, block_size, key_len, iv_len, \
          flags | EVP_CIPH_ECB_MODE,\
          init_key,\
          cname##_ecb_cipher,\
          cleanup,\
          sizeof(EVP_CIPHER_CTX)-sizeof((((EVP_CIPHER_CTX *)NULL)->c))+\
                  sizeof((((EVP_CIPHER_CTX *)NULL)->c.kstruct)),\
          set_asn1, get_asn1,\
          ctrl,\
          NULL \
  };\
  const EVP_CIPHER *EVP_##cname##_ecb(void) { return &cname##_ecb; }
  */
  
  #define IMPLEMENT_BLOCK_CIPHER(cname, ksched, cprefix, kstruct, nid, \
                                 block_size, key_len, iv_len, cbits, \
                                 flags, init_key, \
                                 cleanup, set_asn1, get_asn1, ctrl) \
          BLOCK_CIPHER_all_funcs(cname, cprefix, cbits, kstruct, ksched) \
          BLOCK_CIPHER_defs(cname, kstruct, nid, block_size, key_len, iv_len, \
                            cbits, flags, init_key, cleanup, set_asn1, \
                            get_asn1, ctrl)
  
  #define IMPLEMENT_CFBR(cipher,cprefix,kstruct,ksched,keysize,cbits,iv_len,fl) \
          BLOCK_CIPHER_func_cfb(cipher##_##keysize,cprefix,cbits,kstruct,ksched) \
          BLOCK_CIPHER_def_cfb(cipher##_##keysize,kstruct, \
                               NID_##cipher##_##keysize, keysize/8, iv_len, cbits, \
                               (fl)|EVP_CIPH_FLAG_DEFAULT_ASN1, \
                               cipher##_init_key, NULL, NULL, NULL, NULL)
  
  
  # ifndef OPENSSL_NO_EC
  
  #define X25519_KEYLEN        32
  #define X448_KEYLEN          56
  #define ED448_KEYLEN         57
  
  #define MAX_KEYLEN  ED448_KEYLEN
  
  typedef struct {
      unsigned char pubkey[MAX_KEYLEN];
      unsigned char *privkey;
  } ECX_KEY;
  
  #endif
  
  /*
   * Type needs to be a bit field Sub-type needs to be for variations on the
   * method, as in, can it do arbitrary encryption....
   */
  struct evp_pkey_st {
      /* == Legacy attributes == */
      int type;
      int save_type;
      const EVP_PKEY_ASN1_METHOD *ameth;
      ENGINE *engine;
      ENGINE *pmeth_engine; /* If not NULL public key ENGINE to use */
      union {
          void *ptr;
  # ifndef OPENSSL_NO_RSA
          struct rsa_st *rsa;     /* RSA */
  # endif
  # ifndef OPENSSL_NO_DSA
          struct dsa_st *dsa;     /* DSA */
  # endif
  # ifndef OPENSSL_NO_DH
          struct dh_st *dh;       /* DH */
  # endif
  # ifndef OPENSSL_NO_EC
          struct ec_key_st *ec;   /* ECC */
          ECX_KEY *ecx;           /* X25519, X448, Ed25519, Ed448 */
  # endif
      } pkey;
  
      /* == Common attributes == */
      CRYPTO_REF_COUNT references;
      CRYPTO_RWLOCK *lock;
      STACK_OF(X509_ATTRIBUTE) *attributes; /* [ 0 ] */
      int save_parameters;
  
      /* == Provider attributes == */
      /*
       * To support transparent export/import between providers that
       * support the methods for it, and still not having to do the
       * export/import every time a key is used, we maintain a cache
       * of imported key, indexed by provider address.
       * pkeys[0] is *always* the "original" key.
       */
      struct {
          EVP_KEYMGMT *keymgmt;
          void *provkey;
      } pkeys[10];
      /*
       * If there is a legacy key assigned to this structure, we keep
       * a copy of that key's dirty count.
       */
      size_t dirty_cnt_copy;
  } /* EVP_PKEY */ ;
  
  
  void openssl_add_all_ciphers_int(void);
  void openssl_add_all_digests_int(void);
  void openssl_add_all_macs_int(void);
  void openssl_add_all_kdfs_int(void);
  void evp_cleanup_int(void);
  void evp_app_cleanup_int(void);
  
  /* KEYMGMT helper functions */
  void *evp_keymgmt_export_to_provider(EVP_PKEY *pk, EVP_KEYMGMT *keymgmt);
  void evp_keymgmt_clear_pkey_cache(EVP_PKEY *pk);
  
  /* KEYMGMT provider interface functions */
  void *evp_keymgmt_importdomparams(const EVP_KEYMGMT *keymgmt,
                                    const OSSL_PARAM params[]);
  void *evp_keymgmt_gendomparams(const EVP_KEYMGMT *keymgmt,
                              const OSSL_PARAM params[]);
  void evp_keymgmt_freedomparams(const EVP_KEYMGMT *keymgmt,
                                 void *provdomparams);
  int evp_keymgmt_exportdomparams(const EVP_KEYMGMT *keymgmt,
                                  void *provdomparams, OSSL_PARAM params[]);
  const OSSL_PARAM *
  evp_keymgmt_importdomparam_types(const EVP_KEYMGMT *keymgmt);
  const OSSL_PARAM *
  evp_keymgmt_exportdomparam_types(const EVP_KEYMGMT *keymgmt);
  
  void *evp_keymgmt_importkey(const EVP_KEYMGMT *keymgmt,
                              const OSSL_PARAM params[]);
  void *evp_keymgmt_genkey(const EVP_KEYMGMT *keymgmt, void *domparams,
                           const OSSL_PARAM params[]);
  void *evp_keymgmt_loadkey(const EVP_KEYMGMT *keymgmt,
                            void *id, size_t idlen);
  void evp_keymgmt_freekey(const EVP_KEYMGMT *keymgmt, void *provkey);
  int evp_keymgmt_exportkey(const EVP_KEYMGMT *keymgmt,
                                 void *provkey, OSSL_PARAM params[]);
  const OSSL_PARAM *evp_keymgmt_importkey_types(const EVP_KEYMGMT *keymgmt);
  const OSSL_PARAM *evp_keymgmt_exportkey_types(const EVP_KEYMGMT *keymgmt);
  
  /* Pulling defines out of C source files */
  
  #define EVP_RC4_KEY_SIZE 16
  #ifndef TLS1_1_VERSION
  # define TLS1_1_VERSION   0x0302
  #endif
  
  void evp_encode_ctx_set_flags(EVP_ENCODE_CTX *ctx, unsigned int flags);
  
  /* EVP_ENCODE_CTX flags */
  /* Don't generate new lines when encoding */
  #define EVP_ENCODE_CTX_NO_NEWLINES          1
  /* Use the SRP base64 alphabet instead of the standard one */
  #define EVP_ENCODE_CTX_USE_SRP_ALPHABET     2
  