text: /*
   * Copyright 2015-2021 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 <string.h>
  
  #include <openssl/evp.h>
  #include "crypto/evp.h"
  #include "internal/provider.h"
  #include "evp_local.h"
  
  EVP_CIPHER *EVP_CIPHER_meth_new(int cipher_type, int block_size, int key_len)
  {
      EVP_CIPHER *cipher = evp_cipher_new();
  
      if (cipher != NULL) {
          cipher->nid = cipher_type;
          cipher->block_size = block_size;
          cipher->key_len = key_len;
          cipher->origin = EVP_ORIG_METH;
      }
      return cipher;
  }
  
  EVP_CIPHER *EVP_CIPHER_meth_dup(const EVP_CIPHER *cipher)
  {
      EVP_CIPHER *to = NULL;
  
      /*
       * Non-legacy EVP_CIPHERs can't be duplicated like this.
       * Use EVP_CIPHER_up_ref() instead.
       */
      if (cipher->prov != NULL)
          return NULL;
  
      if ((to = EVP_CIPHER_meth_new(cipher->nid, cipher->block_size,
                                    cipher->key_len)) != NULL) {
          CRYPTO_RWLOCK *lock = to->lock;
  
          memcpy(to, cipher, sizeof(*to));
          to->lock = lock;
          to->origin = EVP_ORIG_METH;
      }
      return to;
  }
  
  void EVP_CIPHER_meth_free(EVP_CIPHER *cipher)
  {
      if (cipher == NULL || cipher->origin != EVP_ORIG_METH)
         return;
  
      evp_cipher_free_int(cipher);
  }
  
  int EVP_CIPHER_meth_set_iv_length(EVP_CIPHER *cipher, int iv_len)
  {
      if (cipher->iv_len != 0)
          return 0;
  
      cipher->iv_len = iv_len;
      return 1;
  }
  
  int EVP_CIPHER_meth_set_flags(EVP_CIPHER *cipher, unsigned long flags)
  {
      if (cipher->flags != 0)
          return 0;
  
      cipher->flags = flags;
      return 1;
  }
  
  int EVP_CIPHER_meth_set_impl_ctx_size(EVP_CIPHER *cipher, int ctx_size)
  {
      if (cipher->ctx_size != 0)
          return 0;
  
      cipher->ctx_size = ctx_size;
      return 1;
  }
  
  int EVP_CIPHER_meth_set_init(EVP_CIPHER *cipher,
                               int (*init) (EVP_CIPHER_CTX *ctx,
                                            const unsigned char *key,
                                            const unsigned char *iv,
                                            int enc))
  {
      if (cipher->init != NULL)
          return 0;
  
      cipher->init = init;
      return 1;
  }
  
  int EVP_CIPHER_meth_set_do_cipher(EVP_CIPHER *cipher,
                                    int (*do_cipher) (EVP_CIPHER_CTX *ctx,
                                                      unsigned char *out,
                                                      const unsigned char *in,
                                                      size_t inl))
  {
      if (cipher->do_cipher != NULL)
          return 0;
  
      cipher->do_cipher = do_cipher;
      return 1;
  }
  
  int EVP_CIPHER_meth_set_cleanup(EVP_CIPHER *cipher,
                                  int (*cleanup) (EVP_CIPHER_CTX *))
  {
      if (cipher->cleanup != NULL)
          return 0;
  
      cipher->cleanup = cleanup;
      return 1;
  }
  
  int EVP_CIPHER_meth_set_set_asn1_params(EVP_CIPHER *cipher,
                                          int (*set_asn1_parameters) (EVP_CIPHER_CTX *,
                                                                      ASN1_TYPE *))
  {
      if (cipher->set_asn1_parameters != NULL)
          return 0;
  
      cipher->set_asn1_parameters = set_asn1_parameters;
      return 1;
  }
  
  int EVP_CIPHER_meth_set_get_asn1_params(EVP_CIPHER *cipher,
                                          int (*get_asn1_parameters) (EVP_CIPHER_CTX *,
                                                                      ASN1_TYPE *))
  {
      if (cipher->get_asn1_parameters != NULL)
          return 0;
  
      cipher->get_asn1_parameters = get_asn1_parameters;
      return 1;
  }
  
  int EVP_CIPHER_meth_set_ctrl(EVP_CIPHER *cipher,
                               int (*ctrl) (EVP_CIPHER_CTX *, int type,
                                            int arg, void *ptr))
  {
      if (cipher->ctrl != NULL)
          return 0;
  
      cipher->ctrl = ctrl;
      return 1;
  }
  
  
  int (*EVP_CIPHER_meth_get_init(const EVP_CIPHER *cipher))(EVP_CIPHER_CTX *ctx,
                                                            const unsigned char *key,
                                                            const unsigned char *iv,
                                                            int enc)
  {
      return cipher->init;
  }
  int (*EVP_CIPHER_meth_get_do_cipher(const EVP_CIPHER *cipher))(EVP_CIPHER_CTX *ctx,
                                                                 unsigned char *out,
                                                                 const unsigned char *in,
                                                                 size_t inl)
  {
      return cipher->do_cipher;
  }
  
  int (*EVP_CIPHER_meth_get_cleanup(const EVP_CIPHER *cipher))(EVP_CIPHER_CTX *)
  {
      return cipher->cleanup;
  }
  
  int (*EVP_CIPHER_meth_get_set_asn1_params(const EVP_CIPHER *cipher))(EVP_CIPHER_CTX *,
                                                                       ASN1_TYPE *)
  {
      return cipher->set_asn1_parameters;
  }
  
  int (*EVP_CIPHER_meth_get_get_asn1_params(const EVP_CIPHER *cipher))(EVP_CIPHER_CTX *,
                                                                 ASN1_TYPE *)
  {
      return cipher->get_asn1_parameters;
  }
  
  int (*EVP_CIPHER_meth_get_ctrl(const EVP_CIPHER *cipher))(EVP_CIPHER_CTX *,
                                                            int type, int arg,
                                                            void *ptr)
  {
      return cipher->ctrl;
  }
  
  