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| 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 <sechash.h> | |
| 6 #include <vector> | |
| 7 | |
| 8 #include "base/stl_util.h" | |
| 9 #include "content/child/webcrypto/algorithm_implementation.h" | |
| 10 #include "content/child/webcrypto/crypto_data.h" | |
| 11 #include "content/child/webcrypto/nss/util_nss.h" | |
| 12 #include "content/child/webcrypto/status.h" | |
| 13 #include "content/child/webcrypto/webcrypto_util.h" | |
| 14 #include "crypto/nss_util.h" | |
| 15 #include "crypto/scoped_nss_types.h" | |
| 16 | |
| 17 namespace content { | |
| 18 | |
| 19 namespace webcrypto { | |
| 20 | |
| 21 namespace { | |
| 22 | |
| 23 HASH_HashType WebCryptoAlgorithmToNSSHashType( | |
| 24 blink::WebCryptoAlgorithmId algorithm) { | |
| 25 switch (algorithm) { | |
| 26 case blink::WebCryptoAlgorithmIdSha1: | |
| 27 return HASH_AlgSHA1; | |
| 28 case blink::WebCryptoAlgorithmIdSha256: | |
| 29 return HASH_AlgSHA256; | |
| 30 case blink::WebCryptoAlgorithmIdSha384: | |
| 31 return HASH_AlgSHA384; | |
| 32 case blink::WebCryptoAlgorithmIdSha512: | |
| 33 return HASH_AlgSHA512; | |
| 34 default: | |
| 35 // Not a digest algorithm. | |
| 36 return HASH_AlgNULL; | |
| 37 } | |
| 38 } | |
| 39 | |
| 40 // Implementation of blink::WebCryptoDigester, an internal Blink detail not | |
| 41 // part of WebCrypto, that allows chunks of data to be streamed in before | |
| 42 // computing a SHA-* digest (as opposed to ShaImplementation, which computes | |
| 43 // digests over complete messages) | |
| 44 class DigestorNSS : public blink::WebCryptoDigestor { | |
| 45 public: | |
| 46 explicit DigestorNSS(blink::WebCryptoAlgorithmId algorithm_id) | |
| 47 : hash_context_(NULL), algorithm_id_(algorithm_id) {} | |
| 48 | |
| 49 ~DigestorNSS() override { | |
| 50 if (!hash_context_) | |
| 51 return; | |
| 52 | |
| 53 HASH_Destroy(hash_context_); | |
| 54 hash_context_ = NULL; | |
| 55 } | |
| 56 | |
| 57 bool consume(const unsigned char* data, unsigned int size) override { | |
| 58 return ConsumeWithStatus(data, size).IsSuccess(); | |
| 59 } | |
| 60 | |
| 61 Status ConsumeWithStatus(const unsigned char* data, unsigned int size) { | |
| 62 // Initialize everything if the object hasn't been initialized yet. | |
| 63 if (!hash_context_) { | |
| 64 Status error = Init(); | |
| 65 if (!error.IsSuccess()) | |
| 66 return error; | |
| 67 } | |
| 68 | |
| 69 HASH_Update(hash_context_, data, size); | |
| 70 | |
| 71 return Status::Success(); | |
| 72 } | |
| 73 | |
| 74 bool finish(unsigned char*& result_data, | |
| 75 unsigned int& result_data_size) override { | |
| 76 Status error = FinishInternal(result_, &result_data_size); | |
| 77 if (!error.IsSuccess()) | |
| 78 return false; | |
| 79 result_data = result_; | |
| 80 return true; | |
| 81 } | |
| 82 | |
| 83 Status FinishWithVectorAndStatus(std::vector<uint8_t>* result) { | |
| 84 if (!hash_context_) | |
| 85 return Status::ErrorUnexpected(); | |
| 86 | |
| 87 unsigned int result_length = HASH_ResultLenContext(hash_context_); | |
| 88 result->resize(result_length); | |
| 89 unsigned char* digest = vector_as_array(result); | |
| 90 unsigned int digest_size; // ignored | |
| 91 return FinishInternal(digest, &digest_size); | |
| 92 } | |
| 93 | |
| 94 private: | |
| 95 Status Init() { | |
| 96 HASH_HashType hash_type = WebCryptoAlgorithmToNSSHashType(algorithm_id_); | |
| 97 | |
| 98 if (hash_type == HASH_AlgNULL) | |
| 99 return Status::ErrorUnsupported(); | |
| 100 | |
| 101 hash_context_ = HASH_Create(hash_type); | |
| 102 if (!hash_context_) | |
| 103 return Status::OperationError(); | |
| 104 | |
| 105 HASH_Begin(hash_context_); | |
| 106 | |
| 107 return Status::Success(); | |
| 108 } | |
| 109 | |
| 110 Status FinishInternal(unsigned char* result, unsigned int* result_size) { | |
| 111 if (!hash_context_) { | |
| 112 Status error = Init(); | |
| 113 if (!error.IsSuccess()) | |
| 114 return error; | |
| 115 } | |
| 116 | |
| 117 unsigned int hash_result_length = HASH_ResultLenContext(hash_context_); | |
| 118 DCHECK_LE(hash_result_length, static_cast<size_t>(HASH_LENGTH_MAX)); | |
| 119 | |
| 120 HASH_End(hash_context_, result, result_size, hash_result_length); | |
| 121 | |
| 122 if (*result_size != hash_result_length) | |
| 123 return Status::ErrorUnexpected(); | |
| 124 return Status::Success(); | |
| 125 } | |
| 126 | |
| 127 HASHContext* hash_context_; | |
| 128 blink::WebCryptoAlgorithmId algorithm_id_; | |
| 129 unsigned char result_[HASH_LENGTH_MAX]; | |
| 130 }; | |
| 131 | |
| 132 class ShaImplementation : public AlgorithmImplementation { | |
| 133 public: | |
| 134 Status Digest(const blink::WebCryptoAlgorithm& algorithm, | |
| 135 const CryptoData& data, | |
| 136 std::vector<uint8_t>* buffer) const override { | |
| 137 DigestorNSS digestor(algorithm.id()); | |
| 138 Status error = digestor.ConsumeWithStatus(data.bytes(), data.byte_length()); | |
| 139 // http://crbug.com/366427: the spec does not define any other failures for | |
| 140 // digest, so none of the subsequent errors are spec compliant. | |
| 141 if (!error.IsSuccess()) | |
| 142 return error; | |
| 143 return digestor.FinishWithVectorAndStatus(buffer); | |
| 144 } | |
| 145 }; | |
| 146 | |
| 147 } // namespace | |
| 148 | |
| 149 AlgorithmImplementation* CreatePlatformShaImplementation() { | |
| 150 return new ShaImplementation(); | |
| 151 } | |
| 152 | |
| 153 scoped_ptr<blink::WebCryptoDigestor> CreatePlatformDigestor( | |
| 154 blink::WebCryptoAlgorithmId algorithm) { | |
| 155 return scoped_ptr<blink::WebCryptoDigestor>(new DigestorNSS(algorithm)); | |
| 156 } | |
| 157 | |
| 158 } // namespace webcrypto | |
| 159 | |
| 160 } // namespace content | |
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Chromium Code Reviews
Issue 1077273002:
html_viewer: Move webcrypto to a place where html_viewer can use it. (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@master