text: /*
   * Copyright (C) 2014 Igalia S.L.
   * Copyright (C) 2016 SoftAtHome
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
   * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
   * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
   * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
   * THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  #include "config.h"
  #include "CryptoDigest.h"
  
  #include <gcrypt.h>
  
  namespace PAL {
  
  struct CryptoDigestContext {
      int algorithm;
      gcry_md_hd_t md;
  };
  
  CryptoDigest::CryptoDigest()
      : m_context(new CryptoDigestContext)
  {
  }
  
  CryptoDigest::~CryptoDigest() = default;
  
  std::unique_ptr<CryptoDigest> CryptoDigest::create(CryptoDigest::Algorithm algorithm)
  {
      int gcryptAlgorithm;
  
      switch (algorithm) {
      case CryptoDigest::Algorithm::SHA_1:
          gcryptAlgorithm = GCRY_MD_SHA1;
          break;
      case CryptoDigest::Algorithm::SHA_224:
          gcryptAlgorithm = GCRY_MD_SHA224;
          break;
      case CryptoDigest::Algorithm::SHA_256:
          gcryptAlgorithm = GCRY_MD_SHA256;
          break;
      case CryptoDigest::Algorithm::SHA_384:
          gcryptAlgorithm = GCRY_MD_SHA384;
          break;
      case CryptoDigest::Algorithm::SHA_512:
          gcryptAlgorithm = GCRY_MD_SHA512;
          break;
      }
  
      std::unique_ptr<CryptoDigest> digest(new CryptoDigest);
      digest->m_context->algorithm = gcryptAlgorithm;
  
      gcry_md_open(&digest->m_context->md, gcryptAlgorithm, 0);
      if (!digest->m_context->md)
          return nullptr;
  
      return digest;
  }
  
  void CryptoDigest::addBytes(const void* input, size_t length)
  {
      gcry_md_write(m_context->md, input, length);
  }
  
  Vector<uint8_t> CryptoDigest::computeHash()
  {
      int digestLen = gcry_md_get_algo_dlen(m_context->algorithm);
      Vector<uint8_t> result(digestLen);
  
      gcry_md_final(m_context->md);
      memcpy(result.data(), gcry_md_read(m_context->md, 0), digestLen);
      gcry_md_close(m_context->md);
  
      return result;
  }
  
  } // namespace PAL
  