third_party/WebKit/Source/platform/Crypto.cpp

   1 // Copyright 2014 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 "config.h"
   6 #include "platform/Crypto.h"
   7
   8 #include "public/platform/Platform.h"
   9 #include "public/platform/WebCrypto.h"
  10 #include "public/platform/WebCryptoAlgorithm.h"
  11
  12 namespace blink {
  13
  14 static WebCryptoAlgorithmId toWebCryptoAlgorithmId(HashAlgorithm algorithm)
  15 {
  16     switch (algorithm) {
  17     case HashAlgorithmSha1:
  18         return WebCryptoAlgorithmIdSha1;
  19     case HashAlgorithmSha256:
  20         return WebCryptoAlgorithmIdSha256;
  21     case HashAlgorithmSha384:
  22         return WebCryptoAlgorithmIdSha384;
  23     case HashAlgorithmSha512:
  24         return WebCryptoAlgorithmIdSha512;
  25     };
  26
  27     ASSERT_NOT_REACHED();
  28     return WebCryptoAlgorithmIdSha256;
  29 }
  30
  31 bool computeDigest(HashAlgorithm algorithm, const char* digestable, size_t length, DigestValue& digestResult)
  32 {
  33     WebCryptoAlgorithmId algorithmId = toWebCryptoAlgorithmId(algorithm);
  34     WebCrypto* crypto = Platform::current()->crypto();
  35     unsigned char* result;
  36     unsigned resultSize;
  37
  38     ASSERT(crypto);
  39
  40     OwnPtr<WebCryptoDigestor> digestor = adoptPtr(crypto->createDigestor(algorithmId));
  41     if (!digestor.get() || !digestor->consume(reinterpret_cast<const unsigned char*>(digestable), length) || !digestor->finish(result, resultSize))
  42         return false;
  43
  44     digestResult.append(static_cast<uint8_t*>(result), resultSize);
  45     return true;
  46 }
  47
  48 PassOwnPtr<WebCryptoDigestor> createDigestor(HashAlgorithm algorithm)
  49 {
  50     return adoptPtr(Platform::current()->crypto()->createDigestor(toWebCryptoAlgorithmId(algorithm)));
  51 }
  52
  53 void finishDigestor(WebCryptoDigestor* digestor, DigestValue& digestResult)
  54 {
  55     unsigned char* result = 0;
  56     unsigned resultSize = 0;
  57
  58     if (!digestor->finish(result, resultSize))
  59         return;
  60
  61     ASSERT(result);
  62
  63     digestResult.append(static_cast<uint8_t*>(result), resultSize);
  64 }
  65
  66 } // namespace blink