Torne (Richard Coles) | 5821806 | 2012-11-14 11:43:16 +0000 | [diff] [blame] | 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() { |
Torne (Richard Coles) | 2a99a7e | 2013-03-28 15:31:22 +0000 | [diff] [blame] | 27 | memset(&ctx_, 0, sizeof(ctx_)); |
Torne (Richard Coles) | 5821806 | 2012-11-14 11:43:16 +0000 | [diff] [blame] | 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 |