content/renderer/webcrypto_impl_nss.cc

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "content/renderer/webcrypto_impl.h"
   6
   7 #include <sechash.h>
   8
   9 #include "base/logging.h"
  10 #include "crypto/nss_util.h"
  11 #include "third_party/WebKit/public/platform/WebArrayBuffer.h"
  12 #include "third_party/WebKit/public/platform/WebCryptoAlgorithm.h"
  13
  14 namespace content {
  15
  16 void WebCryptoImpl::Init() {
  17   crypto::EnsureNSSInit();
  18 }
  19
  20 bool WebCryptoImpl::DigestInternal(
  21     const WebKit::WebCryptoAlgorithm& algorithm,
  22     const unsigned char* data,
  23     unsigned data_size,
  24     WebKit::WebArrayBuffer* buffer) {
  25   HASH_HashType hash_type = HASH_AlgNULL;
  26
  27   switch (algorithm.id()) {
  28     case WebKit::WebCryptoAlgorithmIdSha1:
  29       hash_type = HASH_AlgSHA1;
  30       break;
  31     case WebKit::WebCryptoAlgorithmIdSha224:
  32       hash_type = HASH_AlgSHA224;
  33       break;
  34     case WebKit::WebCryptoAlgorithmIdSha256:
  35       hash_type = HASH_AlgSHA256;
  36       break;
  37     case WebKit::WebCryptoAlgorithmIdSha384:
  38       hash_type = HASH_AlgSHA384;
  39       break;
  40     case WebKit::WebCryptoAlgorithmIdSha512:
  41       hash_type = HASH_AlgSHA512;
  42       break;
  43     default:
  44       // Not a digest algorithm.
  45       return false;
  46   }
  47
  48   HASHContext* context = HASH_Create(hash_type);
  49   if (!context) {
  50     return false;
  51   }
  52
  53   HASH_Begin(context);
  54
  55   HASH_Update(context, data, data_size);
  56
  57   size_t hash_result_length = HASH_ResultLenContext(context);
  58   DCHECK_LE(hash_result_length, static_cast<size_t>(HASH_LENGTH_MAX));
  59
  60   *buffer = WebKit::WebArrayBuffer::create(hash_result_length, 1);
  61
  62   unsigned char* digest = reinterpret_cast<unsigned char*>(buffer->data());
  63
  64   uint32 result_length = 0;
  65   HASH_End(context, digest, &result_length, hash_result_length);
  66
  67   HASH_Destroy(context);
  68
  69   return result_length == hash_result_length;
  70 }
  71
  72 }  // namespace content