text: /*
   * Copyright 2000-2021 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
   */
  
  /* EVP_MD_CTX related stuff */
  
  #include <openssl/core_dispatch.h>
  #include "internal/refcount.h"
  
  #define EVP_CTRL_RET_UNSUPPORTED -1
  
  
  struct evp_md_ctx_st {
      const EVP_MD *reqdigest;    /* The original requested digest */
      const EVP_MD *digest;
      ENGINE *engine;             /* functional reference if 'digest' is
                                   * ENGINE-provided */
      unsigned long flags;
      void *md_data;
      /* Public key context for sign/verify */
      EVP_PKEY_CTX *pctx;
      /* Update function: usually copied from EVP_MD */
      int (*update) (EVP_MD_CTX *ctx, const void *data, size_t count);
  
      /* Provider ctx */
      void *provctx;
      EVP_MD *fetched_digest;
  } /* EVP_MD_CTX */ ;
  
  struct evp_cipher_ctx_st {
      const EVP_CIPHER *cipher;
      ENGINE *engine;             /* functional reference if 'cipher' is
                                   * ENGINE-provided */
      int encrypt;                /* encrypt or decrypt */
      int buf_len;                /* number we have left */
      unsigned char oiv[EVP_MAX_IV_LENGTH]; /* original iv */
      unsigned char iv[EVP_MAX_IV_LENGTH]; /* working iv */
      unsigned char buf[EVP_MAX_BLOCK_LENGTH]; /* saved partial block */
      int num;                    /* used by cfb/ofb/ctr mode */
      /* FIXME: Should this even exist? It appears unused */
      void *app_data;             /* application stuff */
      int key_len;                /* May change for variable length cipher */
      unsigned long flags;        /* Various flags */
      void *cipher_data;          /* per EVP data */
      int final_used;
      int block_mask;
      unsigned char final[EVP_MAX_BLOCK_LENGTH]; /* possible final block */
  
      /* Provider ctx */
      void *provctx;
      EVP_CIPHER *fetched_cipher;
  } /* EVP_CIPHER_CTX */ ;
  
  struct evp_mac_ctx_st {
      EVP_MAC *meth;               /* Method structure */
      void *data;                  /* Individual method data */
  } /* EVP_MAC_CTX */;
  
  struct evp_kdf_ctx_st {
      EVP_KDF *meth;              /* Method structure */
      void *data;                 /* Algorithm-specific data */
  } /* EVP_KDF_CTX */ ;
  
  struct evp_rand_ctx_st {
      EVP_RAND *meth;             /* Method structure */
      void *data;                 /* Algorithm-specific data */
      EVP_RAND_CTX *parent;       /* Parent EVP_RAND or NULL if none */
      CRYPTO_REF_COUNT refcnt;    /* Context reference count */
      CRYPTO_RWLOCK *refcnt_lock;
  } /* EVP_RAND_CTX */ ;
  
  struct evp_keymgmt_st {
      int id;                      /* libcrypto internal */
  
      int name_id;
      const char *description;
      OSSL_PROVIDER *prov;
      CRYPTO_REF_COUNT refcnt;
      CRYPTO_RWLOCK *lock;
  
      /* Constructor(s), destructor, information */
      OSSL_FUNC_keymgmt_new_fn *new;
      OSSL_FUNC_keymgmt_free_fn *free;
      OSSL_FUNC_keymgmt_get_params_fn *get_params;
      OSSL_FUNC_keymgmt_gettable_params_fn *gettable_params;
      OSSL_FUNC_keymgmt_set_params_fn *set_params;
      OSSL_FUNC_keymgmt_settable_params_fn *settable_params;
  
      /* Generation, a complex constructor */
      OSSL_FUNC_keymgmt_gen_init_fn *gen_init;
      OSSL_FUNC_keymgmt_gen_set_template_fn *gen_set_template;
      OSSL_FUNC_keymgmt_gen_set_params_fn *gen_set_params;
      OSSL_FUNC_keymgmt_gen_settable_params_fn *gen_settable_params;
      OSSL_FUNC_keymgmt_gen_fn *gen;
      OSSL_FUNC_keymgmt_gen_cleanup_fn *gen_cleanup;
  
      OSSL_FUNC_keymgmt_load_fn *load;
  
      /* Key object checking */
      OSSL_FUNC_keymgmt_query_operation_name_fn *query_operation_name;
      OSSL_FUNC_keymgmt_has_fn *has;
      OSSL_FUNC_keymgmt_validate_fn *validate;
      OSSL_FUNC_keymgmt_match_fn *match;
  
      /* Import and export routines */
      OSSL_FUNC_keymgmt_import_fn *import;
      OSSL_FUNC_keymgmt_import_types_fn *import_types;
      OSSL_FUNC_keymgmt_export_fn *export;
      OSSL_FUNC_keymgmt_export_types_fn *export_types;
      OSSL_FUNC_keymgmt_dup_fn *dup;
  } /* EVP_KEYMGMT */ ;
  
  struct evp_keyexch_st {
      int name_id;
      const char *description;
      OSSL_PROVIDER *prov;
      CRYPTO_REF_COUNT refcnt;
      CRYPTO_RWLOCK *lock;
  
      OSSL_FUNC_keyexch_newctx_fn *newctx;
      OSSL_FUNC_keyexch_init_fn *init;
      OSSL_FUNC_keyexch_set_peer_fn *set_peer;
      OSSL_FUNC_keyexch_derive_fn *derive;
      OSSL_FUNC_keyexch_freectx_fn *freectx;
      OSSL_FUNC_keyexch_dupctx_fn *dupctx;
      OSSL_FUNC_keyexch_set_ctx_params_fn *set_ctx_params;
      OSSL_FUNC_keyexch_settable_ctx_params_fn *settable_ctx_params;
      OSSL_FUNC_keyexch_get_ctx_params_fn *get_ctx_params;
      OSSL_FUNC_keyexch_gettable_ctx_params_fn *gettable_ctx_params;
  } /* EVP_KEYEXCH */;
  
  struct evp_signature_st {
      int name_id;
      const char *description;
      OSSL_PROVIDER *prov;
      CRYPTO_REF_COUNT refcnt;
      CRYPTO_RWLOCK *lock;
  
      OSSL_FUNC_signature_newctx_fn *newctx;
      OSSL_FUNC_signature_sign_init_fn *sign_init;
      OSSL_FUNC_signature_sign_fn *sign;
      OSSL_FUNC_signature_verify_init_fn *verify_init;
      OSSL_FUNC_signature_verify_fn *verify;
      OSSL_FUNC_signature_verify_recover_init_fn *verify_recover_init;
      OSSL_FUNC_signature_verify_recover_fn *verify_recover;
      OSSL_FUNC_signature_digest_sign_init_fn *digest_sign_init;
      OSSL_FUNC_signature_digest_sign_update_fn *digest_sign_update;
      OSSL_FUNC_signature_digest_sign_final_fn *digest_sign_final;
      OSSL_FUNC_signature_digest_sign_fn *digest_sign;
      OSSL_FUNC_signature_digest_verify_init_fn *digest_verify_init;
      OSSL_FUNC_signature_digest_verify_update_fn *digest_verify_update;
      OSSL_FUNC_signature_digest_verify_final_fn *digest_verify_final;
      OSSL_FUNC_signature_digest_verify_fn *digest_verify;
      OSSL_FUNC_signature_freectx_fn *freectx;
      OSSL_FUNC_signature_dupctx_fn *dupctx;
      OSSL_FUNC_signature_get_ctx_params_fn *get_ctx_params;
      OSSL_FUNC_signature_gettable_ctx_params_fn *gettable_ctx_params;
      OSSL_FUNC_signature_set_ctx_params_fn *set_ctx_params;
      OSSL_FUNC_signature_settable_ctx_params_fn *settable_ctx_params;
      OSSL_FUNC_signature_get_ctx_md_params_fn *get_ctx_md_params;
      OSSL_FUNC_signature_gettable_ctx_md_params_fn *gettable_ctx_md_params;
      OSSL_FUNC_signature_set_ctx_md_params_fn *set_ctx_md_params;
      OSSL_FUNC_signature_settable_ctx_md_params_fn *settable_ctx_md_params;
  } /* EVP_SIGNATURE */;
  
  struct evp_asym_cipher_st {
      int name_id;
      const char *description;
      OSSL_PROVIDER *prov;
      CRYPTO_REF_COUNT refcnt;
      CRYPTO_RWLOCK *lock;
  
      OSSL_FUNC_asym_cipher_newctx_fn *newctx;
      OSSL_FUNC_asym_cipher_encrypt_init_fn *encrypt_init;
      OSSL_FUNC_asym_cipher_encrypt_fn *encrypt;
      OSSL_FUNC_asym_cipher_decrypt_init_fn *decrypt_init;
      OSSL_FUNC_asym_cipher_decrypt_fn *decrypt;
      OSSL_FUNC_asym_cipher_freectx_fn *freectx;
      OSSL_FUNC_asym_cipher_dupctx_fn *dupctx;
      OSSL_FUNC_asym_cipher_get_ctx_params_fn *get_ctx_params;
      OSSL_FUNC_asym_cipher_gettable_ctx_params_fn *gettable_ctx_params;
      OSSL_FUNC_asym_cipher_set_ctx_params_fn *set_ctx_params;
      OSSL_FUNC_asym_cipher_settable_ctx_params_fn *settable_ctx_params;
  } /* EVP_ASYM_CIPHER */;
  
  struct evp_kem_st {
      int name_id;
      const char *description;
      OSSL_PROVIDER *prov;
      CRYPTO_REF_COUNT refcnt;
      CRYPTO_RWLOCK *lock;
  
      OSSL_FUNC_kem_newctx_fn *newctx;
      OSSL_FUNC_kem_encapsulate_init_fn *encapsulate_init;
      OSSL_FUNC_kem_encapsulate_fn *encapsulate;
      OSSL_FUNC_kem_decapsulate_init_fn *decapsulate_init;
      OSSL_FUNC_kem_decapsulate_fn *decapsulate;
      OSSL_FUNC_kem_freectx_fn *freectx;
      OSSL_FUNC_kem_dupctx_fn *dupctx;
      OSSL_FUNC_kem_get_ctx_params_fn *get_ctx_params;
      OSSL_FUNC_kem_gettable_ctx_params_fn *gettable_ctx_params;
      OSSL_FUNC_kem_set_ctx_params_fn *set_ctx_params;
      OSSL_FUNC_kem_settable_ctx_params_fn *settable_ctx_params;
  } /* EVP_KEM */;
  
  int PKCS5_v2_PBKDF2_keyivgen(EVP_CIPHER_CTX *ctx, const char *pass,
                               int passlen, ASN1_TYPE *param,
                               const EVP_CIPHER *c, const EVP_MD *md,
                               int en_de);
  
  struct evp_Encode_Ctx_st {
      /* number saved in a partial encode/decode */
      int num;
      /*
       * The length is either the output line length (in input bytes) or the
       * shortest input line length that is ok.  Once decoding begins, the
       * length is adjusted up each time a longer line is decoded
       */
      int length;
      /* data to encode */
      unsigned char enc_data[80];
      /* number read on current line */
      int line_num;
      unsigned int flags;
  };
  
  typedef struct evp_pbe_st EVP_PBE_CTL;
  DEFINE_STACK_OF(EVP_PBE_CTL)
  
  int ossl_is_partially_overlapping(const void *ptr1, const void *ptr2, int len);
  
  #include <openssl/types.h>
  #include <openssl/core.h>
  
  void *evp_generic_fetch(OSSL_LIB_CTX *ctx, int operation_id,
                          const char *name, const char *properties,
                          void *(*new_method)(int name_id,
                                              const OSSL_ALGORITHM *algodef,
                                              OSSL_PROVIDER *prov),
                          int (*up_ref_method)(void *),
                          void (*free_method)(void *));
  void *evp_generic_fetch_by_number(OSSL_LIB_CTX *ctx, int operation_id,
                                    int name_id, const char *properties,
                                    void *(*new_method)(int name_id,
                                                        const OSSL_ALGORITHM *algodef,
                                                        OSSL_PROVIDER *prov),
                                    int (*up_ref_method)(void *),
                                    void (*free_method)(void *));
  void evp_generic_do_all(OSSL_LIB_CTX *libctx, int operation_id,
                          void (*user_fn)(void *method, void *arg),
                          void *user_arg,
                          void *(*new_method)(int name_id,
                                              const OSSL_ALGORITHM *algodef,
                                              OSSL_PROVIDER *prov),
                          void (*free_method)(void *));
  
  /* Internal fetchers for method types that are to be combined with others */
  EVP_KEYMGMT *evp_keymgmt_fetch_by_number(OSSL_LIB_CTX *ctx, int name_id,
                                           const char *properties);
  
  /* Internal structure constructors for fetched methods */
  EVP_MD *evp_md_new(void);
  EVP_CIPHER *evp_cipher_new(void);
  
  int evp_cipher_get_asn1_aead_params(EVP_CIPHER_CTX *c, ASN1_TYPE *type,
                                      evp_cipher_aead_asn1_params *asn1_params);
  int evp_cipher_set_asn1_aead_params(EVP_CIPHER_CTX *c, ASN1_TYPE *type,
                                      evp_cipher_aead_asn1_params *asn1_params);
  
  /* Helper functions to avoid duplicating code */
  
  /*
   * These methods implement different ways to pass a params array to the
   * provider.  They will return one of these values:
   *
   * -2 if the method doesn't come from a provider
   *    (evp_do_param will return this to the called)
   * -1 if the provider doesn't offer the desired function
   *    (evp_do_param will raise an error and return 0)
   * or the return value from the desired function
   *    (evp_do_param will return it to the caller)
   */
  int evp_do_ciph_getparams(const EVP_CIPHER *ciph, OSSL_PARAM params[]);
  int evp_do_ciph_ctx_getparams(const EVP_CIPHER *ciph, void *provctx,
                                OSSL_PARAM params[]);
  int evp_do_ciph_ctx_setparams(const EVP_CIPHER *ciph, void *provctx,
                                OSSL_PARAM params[]);
  int evp_do_md_getparams(const EVP_MD *md, OSSL_PARAM params[]);
  int evp_do_md_ctx_getparams(const EVP_MD *md, void *provctx,
                              OSSL_PARAM params[]);
  int evp_do_md_ctx_setparams(const EVP_MD *md, void *provctx,
                              OSSL_PARAM params[]);
  
  OSSL_PARAM *evp_pkey_to_param(EVP_PKEY *pkey, size_t *sz);
  
  #define M_check_autoarg(ctx, arg, arglen, err) \
      if (ctx->pmeth->flags & EVP_PKEY_FLAG_AUTOARGLEN) {           \
          size_t pksize = (size_t)EVP_PKEY_size(ctx->pkey);         \
                                                                    \
          if (pksize == 0) {                                        \
              ERR_raise(ERR_LIB_EVP, EVP_R_INVALID_KEY); /*ckerr_ignore*/ \
              return 0;                                             \
          }                                                         \
          if (arg == NULL) {                                        \
              *arglen = pksize;                                     \
              return 1;                                             \
          }                                                         \
          if (*arglen < pksize) {                                   \
              ERR_raise(ERR_LIB_EVP, EVP_R_BUFFER_TOO_SMALL); /*ckerr_ignore*/ \
              return 0;                                             \
          }                                                         \
      }
  
  void evp_pkey_ctx_free_old_ops(EVP_PKEY_CTX *ctx);
  void evp_cipher_free_int(EVP_CIPHER *md);
  void evp_md_free_int(EVP_MD *md);
  
  /* OSSL_PROVIDER * is only used to get the library context */
  const char *evp_first_name(const OSSL_PROVIDER *prov, int name_id);
  int evp_is_a(OSSL_PROVIDER *prov, int number,
               const char *legacy_name, const char *name);
  int evp_names_do_all(OSSL_PROVIDER *prov, int number,
                       void (*fn)(const char *name, void *data),
                       void *data);
  int evp_cipher_cache_constants(EVP_CIPHER *cipher);
  