text: /*
   * Copyright 1995-2021 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 _meth_ APIs are deprecated for public use, but still ok for
   * internal use.
   */
  #include "internal/deprecated.h"
  
  #include <stdio.h>
  #include "internal/cryptlib.h"
  #include <openssl/evp.h>
  #include <openssl/objects.h>
  #include <openssl/params.h>
  #include <openssl/core_names.h>
  #include <openssl/dh.h>
  #include <openssl/ec.h>
  #include "crypto/evp.h"
  #include "crypto/asn1.h"
  #include "internal/provider.h"
  #include "evp_local.h"
  
  #if !defined(FIPS_MODULE)
  int EVP_CIPHER_param_to_asn1(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
  {
      return evp_cipher_param_to_asn1_ex(c, type, NULL);
  }
  
  int EVP_CIPHER_asn1_to_param(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
  {
      return evp_cipher_asn1_to_param_ex(c, type, NULL);
  }
  
  int EVP_CIPHER_get_asn1_iv(EVP_CIPHER_CTX *ctx, ASN1_TYPE *type)
  {
      int i = 0;
      unsigned int l;
  
      if (type != NULL) {
          unsigned char iv[EVP_MAX_IV_LENGTH];
  
          l = EVP_CIPHER_CTX_iv_length(ctx);
          if (!ossl_assert(l <= sizeof(iv)))
              return -1;
          i = ASN1_TYPE_get_octetstring(type, iv, l);
          if (i != (int)l)
              return -1;
  
          if (!EVP_CipherInit_ex(ctx, NULL, NULL, NULL, iv, -1))
              return -1;
      }
      return i;
  }
  
  int EVP_CIPHER_set_asn1_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
  {
      int i = 0;
      unsigned int j;
      unsigned char *oiv = NULL;
  
      if (type != NULL) {
          oiv = (unsigned char *)EVP_CIPHER_CTX_original_iv(c);
          j = EVP_CIPHER_CTX_iv_length(c);
          OPENSSL_assert(j <= sizeof(c->iv));
          i = ASN1_TYPE_set_octetstring(type, oiv, j);
      }
      return i;
  }
  
  int evp_cipher_param_to_asn1_ex(EVP_CIPHER_CTX *c, ASN1_TYPE *type,
                                  evp_cipher_aead_asn1_params *asn1_params)
  {
      int ret = -1;                /* Assume the worst */
      const EVP_CIPHER *cipher = c->cipher;
  
      /*
       * For legacy implementations, we detect custom AlgorithmIdentifier
       * parameter handling by checking if the function pointer
       * cipher->set_asn1_parameters is set.  We know that this pointer
       * is NULL for provided implementations.
       *
       * Otherwise, for any implementation, we check the flag
       * EVP_CIPH_FLAG_CUSTOM_ASN1.  If it isn't set, we apply
       * default AI parameter extraction.
       *
       * Otherwise, for provided implementations, we convert |type| to
       * a DER encoded blob and pass to the implementation in OSSL_PARAM
       * form.
       *
       * If none of the above applies, this operation is unsupported.
       */
      if (cipher->set_asn1_parameters != NULL) {
          ret = cipher->set_asn1_parameters(c, type);
      } else if ((EVP_CIPHER_flags(cipher) & EVP_CIPH_FLAG_CUSTOM_ASN1) == 0) {
          switch (EVP_CIPHER_mode(cipher)) {
          case EVP_CIPH_WRAP_MODE:
              if (EVP_CIPHER_is_a(cipher, SN_id_smime_alg_CMS3DESwrap))
                  ASN1_TYPE_set(type, V_ASN1_NULL, NULL);
              ret = 1;
              break;
  
          case EVP_CIPH_GCM_MODE:
              ret = evp_cipher_set_asn1_aead_params(c, type, asn1_params);
              break;
  
          case EVP_CIPH_CCM_MODE:
          case EVP_CIPH_XTS_MODE:
          case EVP_CIPH_OCB_MODE:
              ret = -2;
              break;
  
          default:
              ret = EVP_CIPHER_set_asn1_iv(c, type);
          }
      } else if (cipher->prov != NULL) {
          OSSL_PARAM params[3], *p = params;
          unsigned char *der = NULL, *derp;
  
          /*
           * We make two passes, the first to get the appropriate buffer size,
           * and the second to get the actual value.
           */
          *p++ = OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_ALG_ID,
                                                   NULL, 0);
          *p = OSSL_PARAM_construct_end();
  
          if (!EVP_CIPHER_CTX_get_params(c, params))
              goto err;
  
          /* ... but, we should get a return size too! */
          if (OSSL_PARAM_modified(params)
              && params[0].return_size != 0
              && (der = OPENSSL_malloc(params[0].return_size)) != NULL) {
              params[0].data = der;
              params[0].data_size = params[0].return_size;
              OSSL_PARAM_set_all_unmodified(params);
              derp = der;
              if (EVP_CIPHER_CTX_get_params(c, params)
                  && OSSL_PARAM_modified(params)
                  && d2i_ASN1_TYPE(&type, (const unsigned char **)&derp,
                                   params[0].return_size) != NULL) {
                  ret = 1;
              }
              OPENSSL_free(der);
          }
      } else {
          ret = -2;
      }
  
   err:
      if (ret == -2)
          ERR_raise(ERR_LIB_EVP, EVP_R_UNSUPPORTED_CIPHER);
      else if (ret <= 0)
          ERR_raise(ERR_LIB_EVP, EVP_R_CIPHER_PARAMETER_ERROR);
      if (ret < -1)
          ret = -1;
      return ret;
  }
  
  int evp_cipher_asn1_to_param_ex(EVP_CIPHER_CTX *c, ASN1_TYPE *type,
                                  evp_cipher_aead_asn1_params *asn1_params)
  {
      int ret = -1;                /* Assume the worst */
      const EVP_CIPHER *cipher = c->cipher;
  
      /*
       * For legacy implementations, we detect custom AlgorithmIdentifier
       * parameter handling by checking if there the function pointer
       * cipher->get_asn1_parameters is set.  We know that this pointer
       * is NULL for provided implementations.
       *
       * Otherwise, for any implementation, we check the flag
       * EVP_CIPH_FLAG_CUSTOM_ASN1.  If it isn't set, we apply
       * default AI parameter creation.
       *
       * Otherwise, for provided implementations, we get the AI parameter
       * in DER encoded form from the implementation by requesting the
       * appropriate OSSL_PARAM and converting the result to a ASN1_TYPE.
       *
       * If none of the above applies, this operation is unsupported.
       */
      if (cipher->get_asn1_parameters != NULL) {
          ret = cipher->get_asn1_parameters(c, type);
      } else if ((EVP_CIPHER_flags(cipher) & EVP_CIPH_FLAG_CUSTOM_ASN1) == 0) {
          switch (EVP_CIPHER_mode(cipher)) {
          case EVP_CIPH_WRAP_MODE:
              ret = 1;
              break;
  
          case EVP_CIPH_GCM_MODE:
              ret = evp_cipher_get_asn1_aead_params(c, type, asn1_params);
              break;
  
          case EVP_CIPH_CCM_MODE:
          case EVP_CIPH_XTS_MODE:
          case EVP_CIPH_OCB_MODE:
              ret = -2;
              break;
  
          default:
              ret = EVP_CIPHER_get_asn1_iv(c, type);
          }
      } else if (cipher->prov != NULL) {
          OSSL_PARAM params[3], *p = params;
          unsigned char *der = NULL;
          int derl = -1;
  
          if ((derl = i2d_ASN1_TYPE(type, &der)) >= 0) {
              *p++ =
                  OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_ALG_ID,
                                                    der, (size_t)derl);
              *p = OSSL_PARAM_construct_end();
              if (EVP_CIPHER_CTX_set_params(c, params))
                  ret = 1;
              OPENSSL_free(der);
          }
      } else {
          ret = -2;
      }
  
      if (ret == -2)
          ERR_raise(ERR_LIB_EVP, EVP_R_UNSUPPORTED_CIPHER);
      else if (ret <= 0)
          ERR_raise(ERR_LIB_EVP, EVP_R_CIPHER_PARAMETER_ERROR);
      if (ret < -1)
          ret = -1;
      return ret;
  }
  
  int evp_cipher_get_asn1_aead_params(EVP_CIPHER_CTX *c, ASN1_TYPE *type,
                                      evp_cipher_aead_asn1_params *asn1_params)
  {
      int i = 0;
      long tl;
      unsigned char iv[EVP_MAX_IV_LENGTH];
  
      if (type == NULL || asn1_params == NULL)
          return 0;
  
      i = ossl_asn1_type_get_octetstring_int(type, &tl, NULL, EVP_MAX_IV_LENGTH);
      if (i <= 0)
          return -1;
      ossl_asn1_type_get_octetstring_int(type, &tl, iv, i);
  
      memcpy(asn1_params->iv, iv, i);
      asn1_params->iv_len = i;
  
      return i;
  }
  
  int evp_cipher_set_asn1_aead_params(EVP_CIPHER_CTX *c, ASN1_TYPE *type,
                                      evp_cipher_aead_asn1_params *asn1_params)
  {
      if (type == NULL || asn1_params == NULL)
          return 0;
  
      return ossl_asn1_type_set_octetstring_int(type, asn1_params->tag_len,
                                                asn1_params->iv,
                                                asn1_params->iv_len);
  }
  #endif /* !defined(FIPS_MODULE) */
  
  /* Convert the various cipher NIDs and dummies to a proper OID NID */
  int EVP_CIPHER_type(const EVP_CIPHER *cipher)
  {
      int nid;
      nid = EVP_CIPHER_nid(cipher);
  
      switch (nid) {
  
      case NID_rc2_cbc:
      case NID_rc2_64_cbc:
      case NID_rc2_40_cbc:
  
          return NID_rc2_cbc;
  
      case NID_rc4:
      case NID_rc4_40:
  
          return NID_rc4;
  
      case NID_aes_128_cfb128:
      case NID_aes_128_cfb8:
      case NID_aes_128_cfb1:
  
          return NID_aes_128_cfb128;
  
      case NID_aes_192_cfb128:
      case NID_aes_192_cfb8:
      case NID_aes_192_cfb1:
  
          return NID_aes_192_cfb128;
  
      case NID_aes_256_cfb128:
      case NID_aes_256_cfb8:
      case NID_aes_256_cfb1:
  
          return NID_aes_256_cfb128;
  
      case NID_des_cfb64:
      case NID_des_cfb8:
      case NID_des_cfb1:
  
          return NID_des_cfb64;
  
      case NID_des_ede3_cfb64:
      case NID_des_ede3_cfb8:
      case NID_des_ede3_cfb1:
  
          return NID_des_cfb64;
  
      default:
  #ifdef FIPS_MODULE
          return NID_undef;
  #else
          {
              /* Check it has an OID and it is valid */
              ASN1_OBJECT *otmp = OBJ_nid2obj(nid);
  
              if (OBJ_get0_data(otmp) == NULL)
                  nid = NID_undef;
              ASN1_OBJECT_free(otmp);
              return nid;
          }
  #endif
      }
  }
  
  int evp_cipher_cache_constants(EVP_CIPHER *cipher)
  {
      int ok, aead = 0, custom_iv = 0, cts = 0, multiblock = 0;
      size_t ivlen = 0;
      size_t blksz = 0;
      size_t keylen = 0;
      unsigned int mode = 0;
      OSSL_PARAM params[9];
  
      params[0] = OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_BLOCK_SIZE, &blksz);
      params[1] = OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_IVLEN, &ivlen);
      params[2] = OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_KEYLEN, &keylen);
      params[3] = OSSL_PARAM_construct_uint(OSSL_CIPHER_PARAM_MODE, &mode);
      params[4] = OSSL_PARAM_construct_int(OSSL_CIPHER_PARAM_AEAD, &aead);
      params[5] = OSSL_PARAM_construct_int(OSSL_CIPHER_PARAM_CUSTOM_IV,
                                           &custom_iv);
      params[6] = OSSL_PARAM_construct_int(OSSL_CIPHER_PARAM_CTS, &cts);
      params[7] = OSSL_PARAM_construct_int(OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK,
                                           &multiblock);
      params[8] = OSSL_PARAM_construct_end();
      ok = evp_do_ciph_getparams(cipher, params);
      if (ok) {
          cipher->block_size = blksz;
          cipher->iv_len = ivlen;
          cipher->key_len = keylen;
          cipher->flags = mode;
          if (aead)
              cipher->flags |= EVP_CIPH_FLAG_AEAD_CIPHER;
          if (custom_iv)
              cipher->flags |= EVP_CIPH_CUSTOM_IV;
          if (cts)
              cipher->flags |= EVP_CIPH_FLAG_CTS;
          if (multiblock)
              cipher->flags |= EVP_CIPH_FLAG_TLS1_1_MULTIBLOCK;
          /* Provided implementations may have a custom cipher_cipher */
          if (cipher->prov != NULL && cipher->ccipher != NULL)
              cipher->flags |= EVP_CIPH_FLAG_CUSTOM_CIPHER;
      }
      return ok;
  }
  
  int EVP_CIPHER_block_size(const EVP_CIPHER *cipher)
  {
      return cipher->block_size;
  }
  
  int EVP_CIPHER_CTX_block_size(const EVP_CIPHER_CTX *ctx)
  {
      return EVP_CIPHER_block_size(ctx->cipher);
  }
  
  int EVP_CIPHER_impl_ctx_size(const EVP_CIPHER *e)
  {
      return e->ctx_size;
  }
  
  int EVP_Cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
                 const unsigned char *in, unsigned int inl)
  {
      if (ctx->cipher->prov != NULL) {
          /*
           * If the provided implementation has a ccipher function, we use it,
           * and translate its return value like this: 0 => -1, 1 => outlen
           *
           * Otherwise, we call the cupdate function if in != NULL, or cfinal
           * if in == NULL.  Regardless of which, we return what we got.
           */
          int ret = -1;
          size_t outl = 0;
          size_t blocksize = EVP_CIPHER_CTX_block_size(ctx);
  
          if (ctx->cipher->ccipher != NULL)
              ret =  ctx->cipher->ccipher(ctx->provctx, out, &outl,
                                          inl + (blocksize == 1 ? 0 : blocksize),
                                          in, (size_t)inl)
                  ? (int)outl : -1;
          else if (in != NULL)
              ret = ctx->cipher->cupdate(ctx->provctx, out, &outl,
                                         inl + (blocksize == 1 ? 0 : blocksize),
                                         in, (size_t)inl);
          else
              ret = ctx->cipher->cfinal(ctx->provctx, out, &outl,
                                        blocksize == 1 ? 0 : blocksize);
  
          return ret;
      }
  
      return ctx->cipher->do_cipher(ctx, out, in, inl);
  }
  
  #ifndef OPENSSL_NO_DEPRECATED_3_0
  const EVP_CIPHER *EVP_CIPHER_CTX_cipher(const EVP_CIPHER_CTX *ctx)
  {
      if (ctx == NULL)
          return NULL;
      return ctx->cipher;
  }
  #endif
  
  const EVP_CIPHER *EVP_CIPHER_CTX_get0_cipher(const EVP_CIPHER_CTX *ctx)
  {
      if (ctx == NULL)
          return NULL;
      return ctx->cipher;
  }
  
  EVP_CIPHER *EVP_CIPHER_CTX_get1_cipher(EVP_CIPHER_CTX *ctx)
  {
      EVP_CIPHER *cipher;
  
      if (ctx == NULL)
          return NULL;
      cipher = (EVP_CIPHER *)ctx->cipher;
      if (!EVP_CIPHER_up_ref(cipher))
          return NULL;
      return cipher;
  }
  
  int EVP_CIPHER_CTX_encrypting(const EVP_CIPHER_CTX *ctx)
  {
      return ctx->encrypt;
  }
  
  unsigned long EVP_CIPHER_flags(const EVP_CIPHER *cipher)
  {
      return cipher->flags;
  }
  
  void *EVP_CIPHER_CTX_get_app_data(const EVP_CIPHER_CTX *ctx)
  {
      return ctx->app_data;
  }
  
  void EVP_CIPHER_CTX_set_app_data(EVP_CIPHER_CTX *ctx, void *data)
  {
      ctx->app_data = data;
  }
  
  void *EVP_CIPHER_CTX_get_cipher_data(const EVP_CIPHER_CTX *ctx)
  {
      return ctx->cipher_data;
  }
  
  void *EVP_CIPHER_CTX_set_cipher_data(EVP_CIPHER_CTX *ctx, void *cipher_data)
  {
      void *old_cipher_data;
  
      old_cipher_data = ctx->cipher_data;
      ctx->cipher_data = cipher_data;
  
      return old_cipher_data;
  }
  
  int EVP_CIPHER_iv_length(const EVP_CIPHER *cipher)
  {
      return cipher->iv_len;
  }
  
  int EVP_CIPHER_CTX_iv_length(const EVP_CIPHER_CTX *ctx)
  {
      int rv, len = EVP_CIPHER_iv_length(ctx->cipher);
      size_t v = len;
      OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
  
      params[0] = OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_IVLEN, &v);
      rv = evp_do_ciph_ctx_getparams(ctx->cipher, ctx->provctx, params);
      if (rv == EVP_CTRL_RET_UNSUPPORTED)
          goto legacy;
      return rv != 0 ? (int)v : -1;
      /* Code below to be removed when legacy support is dropped. */
  legacy:
      if ((EVP_CIPHER_flags(ctx->cipher) & EVP_CIPH_CUSTOM_IV_LENGTH) != 0) {
          rv = EVP_CIPHER_CTX_ctrl((EVP_CIPHER_CTX *)ctx, EVP_CTRL_GET_IVLEN,
                                   0, &len);
          return (rv == 1) ? len : -1;
      }
      return len;
  }
  
  int EVP_CIPHER_CTX_tag_length(const EVP_CIPHER_CTX *ctx)
  {
      int ret;
      size_t v = 0;
      OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
  
      params[0] = OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_AEAD_TAGLEN, &v);
      ret = evp_do_ciph_ctx_getparams(ctx->cipher, ctx->provctx, params);
      return ret == 1 ? (int)v : 0;
  }
  
  #ifndef OPENSSL_NO_DEPRECATED_3_0
  const unsigned char *EVP_CIPHER_CTX_original_iv(const EVP_CIPHER_CTX *ctx)
  {
      int ok;
      const unsigned char *v = ctx->oiv;
      OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
  
      params[0] =
          OSSL_PARAM_construct_octet_ptr(OSSL_CIPHER_PARAM_IV,
                                         (void **)&v, sizeof(ctx->oiv));
      ok = evp_do_ciph_ctx_getparams(ctx->cipher, ctx->provctx, params);
  
      return ok != 0 ? v : NULL;
  }
  
  /*
   * OSSL_PARAM_OCTET_PTR gets us the pointer to the running IV in the provider
   */
  const unsigned char *EVP_CIPHER_CTX_iv(const EVP_CIPHER_CTX *ctx)
  {
      int ok;
      const unsigned char *v = ctx->iv;
      OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
  
      params[0] =
          OSSL_PARAM_construct_octet_ptr(OSSL_CIPHER_PARAM_UPDATED_IV,
                                         (void **)&v, sizeof(ctx->iv));
      ok = evp_do_ciph_ctx_getparams(ctx->cipher, ctx->provctx, params);
  
      return ok != 0 ? v : NULL;
  }
  
  unsigned char *EVP_CIPHER_CTX_iv_noconst(EVP_CIPHER_CTX *ctx)
  {
      int ok;
      unsigned char *v = ctx->iv;
      OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
  
      params[0] =
          OSSL_PARAM_construct_octet_ptr(OSSL_CIPHER_PARAM_UPDATED_IV,
                                         (void **)&v, sizeof(ctx->iv));
      ok = evp_do_ciph_ctx_getparams(ctx->cipher, ctx->provctx, params);
  
      return ok != 0 ? v : NULL;
  }
  #endif /* OPENSSL_NO_DEPRECATED_3_0_0 */
  
  int EVP_CIPHER_CTX_get_updated_iv(EVP_CIPHER_CTX *ctx, void *buf, size_t len)
  {
      OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
  
      params[0] =
          OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_UPDATED_IV, buf, len);
      return evp_do_ciph_ctx_getparams(ctx->cipher, ctx->provctx, params);
  }
  
  int EVP_CIPHER_CTX_get_original_iv(EVP_CIPHER_CTX *ctx, void *buf, size_t len)
  {
      OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
  
      params[0] =
          OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_IV, buf, len);
      return evp_do_ciph_ctx_getparams(ctx->cipher, ctx->provctx, params);
  }
  
  unsigned char *EVP_CIPHER_CTX_buf_noconst(EVP_CIPHER_CTX *ctx)
  {
      return ctx->buf;
  }
  
  int EVP_CIPHER_CTX_num(const EVP_CIPHER_CTX *ctx)
  {
      int ok;
      unsigned int v = (unsigned int)ctx->num;
      OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
  
      params[0] = OSSL_PARAM_construct_uint(OSSL_CIPHER_PARAM_NUM, &v);
      ok = evp_do_ciph_ctx_getparams(ctx->cipher, ctx->provctx, params);
  
      return ok != 0 ? (int)v : EVP_CTRL_RET_UNSUPPORTED;
  }
  
  int EVP_CIPHER_CTX_set_num(EVP_CIPHER_CTX *ctx, int num)
  {
      int ok;
      unsigned int n = (unsigned int)num;
      OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
  
      params[0] = OSSL_PARAM_construct_uint(OSSL_CIPHER_PARAM_NUM, &n);
      ok = evp_do_ciph_ctx_setparams(ctx->cipher, ctx->provctx, params);
  
      if (ok != 0)
          ctx->num = (int)n;
      return ok != 0;
  }
  
  int EVP_CIPHER_key_length(const EVP_CIPHER *cipher)
  {
      return cipher->key_len;
  }
  
  int EVP_CIPHER_CTX_key_length(const EVP_CIPHER_CTX *ctx)
  {
      int ok;
      size_t v = ctx->key_len;
      OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
  
      params[0] = OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_KEYLEN, &v);
      ok = evp_do_ciph_ctx_getparams(ctx->cipher, ctx->provctx, params);
  
      return ok != 0 ? (int)v : EVP_CTRL_RET_UNSUPPORTED;
  }
  
  int EVP_CIPHER_nid(const EVP_CIPHER *cipher)
  {
      return cipher->nid;
  }
  
  int EVP_CIPHER_CTX_nid(const EVP_CIPHER_CTX *ctx)
  {
      return ctx->cipher->nid;
  }
  
  int EVP_CIPHER_is_a(const EVP_CIPHER *cipher, const char *name)
  {
      if (cipher->prov != NULL)
          return evp_is_a(cipher->prov, cipher->name_id, NULL, name);
      return evp_is_a(NULL, 0, EVP_CIPHER_name(cipher), name);
  }
  
  int EVP_CIPHER_number(const EVP_CIPHER *cipher)
  {
      return cipher->name_id;
  }
  
  const char *EVP_CIPHER_name(const EVP_CIPHER *cipher)
  {
      if (cipher->type_name != NULL)
          return cipher->type_name;
  #ifndef FIPS_MODULE
      return OBJ_nid2sn(EVP_CIPHER_nid(cipher));
  #else
      return NULL;
  #endif
  }
  
  const char *EVP_CIPHER_description(const EVP_CIPHER *cipher)
  {
      if (cipher->description != NULL)
          return cipher->description;
  #ifndef FIPS_MODULE
      return OBJ_nid2ln(EVP_CIPHER_nid(cipher));
  #else
      return NULL;
  #endif
  }
  
  int EVP_CIPHER_names_do_all(const EVP_CIPHER *cipher,
                              void (*fn)(const char *name, void *data),
                              void *data)
  {
      if (cipher->prov != NULL)
          return evp_names_do_all(cipher->prov, cipher->name_id, fn, data);
  
      return 1;
  }
  
  const OSSL_PROVIDER *EVP_CIPHER_provider(const EVP_CIPHER *cipher)
  {
      return cipher->prov;
  }
  
  int EVP_CIPHER_mode(const EVP_CIPHER *cipher)
  {
      return EVP_CIPHER_flags(cipher) & EVP_CIPH_MODE;
  }
  
  int EVP_MD_is_a(const EVP_MD *md, const char *name)
  {
      if (md->prov != NULL)
          return evp_is_a(md->prov, md->name_id, NULL, name);
      return evp_is_a(NULL, 0, EVP_MD_name(md), name);
  }
  
  int EVP_MD_number(const EVP_MD *md)
  {
      return md->name_id;
  }
  
  const char *EVP_MD_description(const EVP_MD *md)
  {
      if (md->description != NULL)
          return md->description;
  #ifndef FIPS_MODULE
      return OBJ_nid2ln(EVP_MD_nid(md));
  #else
      return NULL;
  #endif
  }
  
  const char *EVP_MD_name(const EVP_MD *md)
  {
      if (md == NULL)
          return NULL;
      if (md->type_name != NULL)
          return md->type_name;
  #ifndef FIPS_MODULE
      return OBJ_nid2sn(EVP_MD_nid(md));
  #else
      return NULL;
  #endif
  }
  
  int EVP_MD_names_do_all(const EVP_MD *md,
                          void (*fn)(const char *name, void *data),
                          void *data)
  {
      if (md->prov != NULL)
          return evp_names_do_all(md->prov, md->name_id, fn, data);
  
      return 1;
  }
  
  const OSSL_PROVIDER *EVP_MD_provider(const EVP_MD *md)
  {
      return md->prov;
  }
  
  int EVP_MD_type(const EVP_MD *md)
  {
      return md->type;
  }
  
  int EVP_MD_pkey_type(const EVP_MD *md)
  {
      return md->pkey_type;
  }
  
  int EVP_MD_block_size(const EVP_MD *md)
  {
      if (md == NULL) {
          ERR_raise(ERR_LIB_EVP, EVP_R_MESSAGE_DIGEST_IS_NULL);
          return -1;
      }
      return md->block_size;
  }
  
  int EVP_MD_size(const EVP_MD *md)
  {
      if (md == NULL) {
          ERR_raise(ERR_LIB_EVP, EVP_R_MESSAGE_DIGEST_IS_NULL);
          return -1;
      }
      return md->md_size;
  }
  
  unsigned long EVP_MD_flags(const EVP_MD *md)
  {
      return md->flags;
  }
  
  EVP_MD *EVP_MD_meth_new(int md_type, int pkey_type)
  {
      EVP_MD *md = evp_md_new();
  
      if (md != NULL) {
          md->type = md_type;
          md->pkey_type = pkey_type;
          md->origin = EVP_ORIG_METH;
      }
      return md;
  }
  
  EVP_MD *EVP_MD_meth_dup(const EVP_MD *md)
  {
      EVP_MD *to = NULL;
  
      /*
       * Non-legacy EVP_MDs can't be duplicated like this.
       * Use EVP_MD_up_ref() instead.
       */
      if (md->prov != NULL)
          return NULL;
  
      if ((to = EVP_MD_meth_new(md->type, md->pkey_type)) != NULL) {
          CRYPTO_RWLOCK *lock = to->lock;
  
          memcpy(to, md, sizeof(*to));
          to->lock = lock;
      }
      return to;
  }
  
  void evp_md_free_int(EVP_MD *md)
  {
      OPENSSL_free(md->type_name);
      ossl_provider_free(md->prov);
      CRYPTO_THREAD_lock_free(md->lock);
      OPENSSL_free(md);
  }
  
  void EVP_MD_meth_free(EVP_MD *md)
  {
      if (md == NULL || md->origin != EVP_ORIG_METH)
         return;
  
      evp_md_free_int(md);
  }
  
  int EVP_MD_meth_set_input_blocksize(EVP_MD *md, int blocksize)
  {
      if (md->block_size != 0)
          return 0;
  
      md->block_size = blocksize;
      return 1;
  }
  int EVP_MD_meth_set_result_size(EVP_MD *md, int resultsize)
  {
      if (md->md_size != 0)
          return 0;
  
      md->md_size = resultsize;
      return 1;
  }
  int EVP_MD_meth_set_app_datasize(EVP_MD *md, int datasize)
  {
      if (md->ctx_size != 0)
          return 0;
  
      md->ctx_size = datasize;
      return 1;
  }
  int EVP_MD_meth_set_flags(EVP_MD *md, unsigned long flags)
  {
      if (md->flags != 0)
          return 0;
  
      md->flags = flags;
      return 1;
  }
  int EVP_MD_meth_set_init(EVP_MD *md, int (*init)(EVP_MD_CTX *ctx))
  {
      if (md->init != NULL)
          return 0;
  
      md->init = init;
      return 1;
  }
  int EVP_MD_meth_set_update(EVP_MD *md, int (*update)(EVP_MD_CTX *ctx,
                                                       const void *data,
                                                       size_t count))
  {
      if (md->update != NULL)
          return 0;
  
      md->update = update;
      return 1;
  }
  int EVP_MD_meth_set_final(EVP_MD *md, int (*final)(EVP_MD_CTX *ctx,
                                                     unsigned char *md))
  {
      if (md->final != NULL)
          return 0;
  
      md->final = final;
      return 1;
  }
  int EVP_MD_meth_set_copy(EVP_MD *md, int (*copy)(EVP_MD_CTX *to,
                                                   const EVP_MD_CTX *from))
  {
      if (md->copy != NULL)
          return 0;
  
      md->copy = copy;
      return 1;
  }
  int EVP_MD_meth_set_cleanup(EVP_MD *md, int (*cleanup)(EVP_MD_CTX *ctx))
  {
      if (md->cleanup != NULL)
          return 0;
  
      md->cleanup = cleanup;
      return 1;
  }
  int EVP_MD_meth_set_ctrl(EVP_MD *md, int (*ctrl)(EVP_MD_CTX *ctx, int cmd,
                                                   int p1, void *p2))
  {
      if (md->md_ctrl != NULL)
          return 0;
  
      md->md_ctrl = ctrl;
      return 1;
  }
  
  int EVP_MD_meth_get_input_blocksize(const EVP_MD *md)
  {
      return md->block_size;
  }
  int EVP_MD_meth_get_result_size(const EVP_MD *md)
  {
      return md->md_size;
  }
  int EVP_MD_meth_get_app_datasize(const EVP_MD *md)
  {
      return md->ctx_size;
  }
  unsigned long EVP_MD_meth_get_flags(const EVP_MD *md)
  {
      return md->flags;
  }
  int (*EVP_MD_meth_get_init(const EVP_MD *md))(EVP_MD_CTX *ctx)
  {
      return md->init;
  }
  int (*EVP_MD_meth_get_update(const EVP_MD *md))(EVP_MD_CTX *ctx,
                                                  const void *data,
                                                  size_t count)
  {
      return md->update;
  }
  int (*EVP_MD_meth_get_final(const EVP_MD *md))(EVP_MD_CTX *ctx,
                                                 unsigned char *md)
  {
      return md->final;
  }
  int (*EVP_MD_meth_get_copy(const EVP_MD *md))(EVP_MD_CTX *to,
                                                const EVP_MD_CTX *from)
  {
      return md->copy;
  }
  int (*EVP_MD_meth_get_cleanup(const EVP_MD *md))(EVP_MD_CTX *ctx)
  {
      return md->cleanup;
  }
  int (*EVP_MD_meth_get_ctrl(const EVP_MD *md))(EVP_MD_CTX *ctx, int cmd,
                                                int p1, void *p2)
  {
      return md->md_ctrl;
  }
  
  #ifndef OPENSSL_NO_DEPRECATED_3_0
  const EVP_MD *EVP_MD_CTX_md(const EVP_MD_CTX *ctx)
  {
      if (ctx == NULL)
          return NULL;
      return ctx->reqdigest;
  }
  #endif
  
  const EVP_MD *EVP_MD_CTX_get0_md(const EVP_MD_CTX *ctx)
  {
      if (ctx == NULL)
          return NULL;
      return ctx->reqdigest;
  }
  
  EVP_MD *EVP_MD_CTX_get1_md(EVP_MD_CTX *ctx)
  {
      EVP_MD *md;
  
      if (ctx == NULL)
          return NULL;
      md = (EVP_MD *)ctx->reqdigest;
      if (!EVP_MD_up_ref(md))
          return NULL;
      return md;
  }
  
  EVP_PKEY_CTX *EVP_MD_CTX_pkey_ctx(const EVP_MD_CTX *ctx)
  {
      return ctx->pctx;
  }
  
  #if !defined(FIPS_MODULE)
  /* TODO(3.0): EVP_DigestSign* not yet supported in FIPS module */
  void EVP_MD_CTX_set_pkey_ctx(EVP_MD_CTX *ctx, EVP_PKEY_CTX *pctx)
  {
      /*
       * it's reasonable to set NULL pctx (a.k.a clear the ctx->pctx), so
       * we have to deal with the cleanup job here.
       */
      if (!EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_KEEP_PKEY_CTX))
          EVP_PKEY_CTX_free(ctx->pctx);
  
      ctx->pctx = pctx;
  
      if (pctx != NULL) {
          /* make sure pctx is not freed when destroying EVP_MD_CTX */
          EVP_MD_CTX_set_flags(ctx, EVP_MD_CTX_FLAG_KEEP_PKEY_CTX);
      } else {
          EVP_MD_CTX_clear_flags(ctx, EVP_MD_CTX_FLAG_KEEP_PKEY_CTX);
      }
  }
  #endif /* !defined(FIPS_MODULE) */
  
  void *EVP_MD_CTX_md_data(const EVP_MD_CTX *ctx)
  {
      return ctx->md_data;
  }
  
  int (*EVP_MD_CTX_update_fn(EVP_MD_CTX *ctx))(EVP_MD_CTX *ctx,
                                               const void *data, size_t count)
  {
      return ctx->update;
  }
  
  void EVP_MD_CTX_set_update_fn(EVP_MD_CTX *ctx,
                                int (*update) (EVP_MD_CTX *ctx,
                                               const void *data, size_t count))
  {
      ctx->update = update;
  }
  
  void EVP_MD_CTX_set_flags(EVP_MD_CTX *ctx, int flags)
  {
      ctx->flags |= flags;
  }
  
  void EVP_MD_CTX_clear_flags(EVP_MD_CTX *ctx, int flags)
  {
      ctx->flags &= ~flags;
  }
  
  int EVP_MD_CTX_test_flags(const EVP_MD_CTX *ctx, int flags)
  {
      return (ctx->flags & flags);
  }
  
  void EVP_CIPHER_CTX_set_flags(EVP_CIPHER_CTX *ctx, int flags)
  {
      ctx->flags |= flags;
  }
  
  void EVP_CIPHER_CTX_clear_flags(EVP_CIPHER_CTX *ctx, int flags)
  {
      ctx->flags &= ~flags;
  }
  
  int EVP_CIPHER_CTX_test_flags(const EVP_CIPHER_CTX *ctx, int flags)
  {
      return (ctx->flags & flags);
  }
  
  int EVP_PKEY_CTX_set_group_name(EVP_PKEY_CTX *ctx, const char *name)
  {
      OSSL_PARAM params[] = { OSSL_PARAM_END, OSSL_PARAM_END };
  
      if (ctx == NULL || !EVP_PKEY_CTX_IS_GEN_OP(ctx)) {
          ERR_raise(ERR_LIB_EVP, EVP_R_COMMAND_NOT_SUPPORTED);
          /* Uses the same return values as EVP_PKEY_CTX_ctrl */
          return -2;
      }
  
      if (name == NULL)
          return -1;
  
      params[0] = OSSL_PARAM_construct_utf8_string(OSSL_PKEY_PARAM_GROUP_NAME,
                                                   (char *)name, 0);
      return EVP_PKEY_CTX_set_params(ctx, params);
  }
  
  int EVP_PKEY_CTX_get_group_name(EVP_PKEY_CTX *ctx, char *name, size_t namelen)
  {
      OSSL_PARAM params[] = { OSSL_PARAM_END, OSSL_PARAM_END };
      OSSL_PARAM *p = params;
  
      if (ctx == NULL || !EVP_PKEY_CTX_IS_GEN_OP(ctx)) {
          /* There is no legacy support for this */
          ERR_raise(ERR_LIB_EVP, EVP_R_COMMAND_NOT_SUPPORTED);
          /* Uses the same return values as EVP_PKEY_CTX_ctrl */
          return -2;
      }
  
      if (name == NULL)
          return -1;
  
      *p++ = OSSL_PARAM_construct_utf8_string(OSSL_PKEY_PARAM_GROUP_NAME,
                                              name, namelen);
      if (!EVP_PKEY_CTX_get_params(ctx, params))
          return -1;
      return 1;
  }
  