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