crypto/secure_hash_default.cc

   1 // Copyright (c) 2012 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 "crypto/secure_hash.h"
   6
   7 #include "base/logging.h"
   8 #include "base/pickle.h"
   9 #include "crypto/third_party/nss/chromium-blapi.h"
  10 #include "crypto/third_party/nss/chromium-sha256.h"
  11
  12 namespace crypto {
  13
  14 namespace {
  15
  16 const char kSHA256Descriptor[] = "NSS";
  17
  18 class SecureHashSHA256NSS : public SecureHash {
  19  public:
  20   static const int kSecureHashVersion = 1;
  21
  22   SecureHashSHA256NSS() {
  23     SHA256_Begin(&ctx_);
  24   }
  25
  26   virtual ~SecureHashSHA256NSS() {
  27     memset(&ctx_, 0, sizeof(ctx_));
  28   }
  29
  30   // SecureHash implementation:
  31   virtual void Update(const void* input, size_t len) OVERRIDE {
  32     SHA256_Update(&ctx_, static_cast<const unsigned char*>(input), len);
  33   }
  34
  35   virtual void Finish(void* output, size_t len) OVERRIDE {
  36     SHA256_End(&ctx_, static_cast<unsigned char*>(output), NULL,
  37                static_cast<unsigned int>(len));
  38   }
  39
  40   virtual bool Serialize(Pickle* pickle) OVERRIDE;
  41   virtual bool Deserialize(PickleIterator* data_iterator) OVERRIDE;
  42
  43  private:
  44   SHA256Context ctx_;
  45 };
  46
  47 bool SecureHashSHA256NSS::Serialize(Pickle* pickle) {
  48   if (!pickle)
  49     return false;
  50
  51   if (!pickle->WriteInt(kSecureHashVersion) ||
  52       !pickle->WriteString(kSHA256Descriptor) ||
  53       !pickle->WriteBytes(&ctx_, sizeof(ctx_))) {
  54     return false;
  55   }
  56
  57   return true;
  58 }
  59
  60 bool SecureHashSHA256NSS::Deserialize(PickleIterator* data_iterator) {
  61   int version;
  62   if (!data_iterator->ReadInt(&version))
  63     return false;
  64
  65   if (version > kSecureHashVersion)
  66     return false;  // We don't know how to deal with this.
  67
  68   std::string type;
  69   if (!data_iterator->ReadString(&type))
  70     return false;
  71
  72   if (type != kSHA256Descriptor)
  73     return false;  // It's the wrong kind.
  74
  75   const char* data = NULL;
  76   if (!data_iterator->ReadBytes(&data, sizeof(ctx_)))
  77     return false;
  78
  79   memcpy(&ctx_, data, sizeof(ctx_));
  80
  81   return true;
  82 }
  83
  84 }  // namespace
  85
  86 SecureHash* SecureHash::Create(Algorithm algorithm) {
  87   switch (algorithm) {
  88     case SHA256:
  89       return new SecureHashSHA256NSS();
  90     default:
  91       NOTIMPLEMENTED();
  92       return NULL;
  93   }
  94 }
  95
  96 }  // namespace crypto