text: /*
   * Copyright 2018-2020 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 <string.h>
  #include <stdarg.h>
  #include <openssl/evp.h>
  #include <openssl/err.h>
  #include <openssl/core.h>
  #include <openssl/core_names.h>
  #include <openssl/types.h>
  #include "internal/nelem.h"
  #include "crypto/evp.h"
  #include "internal/provider.h"
  #include "evp_local.h"
  
  EVP_MAC_CTX *EVP_MAC_CTX_new(EVP_MAC *mac)
  {
      EVP_MAC_CTX *ctx = OPENSSL_zalloc(sizeof(EVP_MAC_CTX));
  
      if (ctx == NULL
          || (ctx->data = mac->newctx(ossl_provider_ctx(mac->prov))) == NULL
          || !EVP_MAC_up_ref(mac)) {
          EVPerr(EVP_F_EVP_MAC_CTX_NEW, ERR_R_MALLOC_FAILURE);
          if (ctx != NULL)
              mac->freectx(ctx->data);
          OPENSSL_free(ctx);
          ctx = NULL;
      } else {
          ctx->meth = mac;
      }
      return ctx;
  }
  
  void EVP_MAC_CTX_free(EVP_MAC_CTX *ctx)
  {
      if (ctx != NULL) {
          ctx->meth->freectx(ctx->data);
          ctx->data = NULL;
          /* refcnt-- */
          EVP_MAC_free(ctx->meth);
      }
      OPENSSL_free(ctx);
  }
  
  EVP_MAC_CTX *EVP_MAC_CTX_dup(const EVP_MAC_CTX *src)
  {
      EVP_MAC_CTX *dst;
  
      if (src->data == NULL)
          return NULL;
  
      dst = OPENSSL_malloc(sizeof(*dst));
      if (dst == NULL) {
          EVPerr(EVP_F_EVP_MAC_CTX_DUP, ERR_R_MALLOC_FAILURE);
          return NULL;
      }
  
      *dst = *src;
      if (!EVP_MAC_up_ref(dst->meth)) {
          EVPerr(EVP_F_EVP_MAC_CTX_DUP, ERR_R_MALLOC_FAILURE);
          OPENSSL_free(dst);
          return NULL;
      }
  
      dst->data = src->meth->dupctx(src->data);
      if (dst->data == NULL) {
          EVP_MAC_CTX_free(dst);
          return NULL;
      }
  
      return dst;
  }
  
  EVP_MAC *EVP_MAC_CTX_mac(EVP_MAC_CTX *ctx)
  {
      return ctx->meth;
  }
  
  size_t EVP_MAC_size(EVP_MAC_CTX *ctx)
  {
      size_t sz = 0;
  
      if (ctx->data != NULL) {
          OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
  
          params[0] = OSSL_PARAM_construct_size_t(OSSL_MAC_PARAM_SIZE, &sz);
          if (ctx->meth->get_ctx_params != NULL) {
              if (ctx->meth->get_ctx_params(ctx->data, params))
                  return sz;
          } else if (ctx->meth->get_params != NULL) {
              if (ctx->meth->get_params(params))
                  return sz;
          }
      }
      /*
       * If the MAC hasn't been initialized yet, or there is no size to get,
       * we return zero
       */
      return 0;
  }
  
  int EVP_MAC_init(EVP_MAC_CTX *ctx)
  {
      return ctx->meth->init(ctx->data);
  }
  
  int EVP_MAC_update(EVP_MAC_CTX *ctx, const unsigned char *data, size_t datalen)
  {
      if (datalen == 0)
          return 1;
      return ctx->meth->update(ctx->data, data, datalen);
  }
  
  int EVP_MAC_final(EVP_MAC_CTX *ctx,
                    unsigned char *out, size_t *outl, size_t outsize)
  {
      int l = EVP_MAC_size(ctx);
  
      if (l < 0)
          return 0;
      if (outl != NULL)
          *outl = l;
      if (out == NULL)
          return 1;
      return ctx->meth->final(ctx->data, out, outl, outsize);
  }
  
  /*
   * The {get,set}_params functions return 1 if there is no corresponding
   * function in the implementation.  This is the same as if there was one,
   * but it didn't recognise any of the given params, i.e. nothing in the
   * bag of parameters was useful.
   */
  int EVP_MAC_get_params(EVP_MAC *mac, OSSL_PARAM params[])
  {
      if (mac->get_params != NULL)
          return mac->get_params(params);
      return 1;
  }
  
  int EVP_MAC_CTX_get_params(EVP_MAC_CTX *ctx, OSSL_PARAM params[])
  {
      if (ctx->meth->get_ctx_params != NULL)
          return ctx->meth->get_ctx_params(ctx->data, params);
      return 1;
  }
  
  int EVP_MAC_CTX_set_params(EVP_MAC_CTX *ctx, const OSSL_PARAM params[])
  {
      if (ctx->meth->set_ctx_params != NULL)
          return ctx->meth->set_ctx_params(ctx->data, params);
      return 1;
  }
  
  int EVP_MAC_number(const EVP_MAC *mac)
  {
      return mac->name_id;
  }
  
  int EVP_MAC_is_a(const EVP_MAC *mac, const char *name)
  {
      return evp_is_a(mac->prov, mac->name_id, NULL, name);
  }
  
  void EVP_MAC_names_do_all(const EVP_MAC *mac,
                            void (*fn)(const char *name, void *data),
                            void *data)
  {
      if (mac->prov != NULL)
          evp_names_do_all(mac->prov, mac->name_id, fn, data);
  }
  