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1 // Copyright 2014 The Chromium Authors. All rights reserved. | 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 | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include <stddef.h> | 5 #include <stddef.h> |
6 #include <stdint.h> | 6 #include <stdint.h> |
7 #include <string.h> | 7 #include <string.h> |
8 | 8 |
9 #include "base/logging.h" | 9 #include "base/logging.h" |
10 #include "base/macros.h" | 10 #include "base/macros.h" |
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159 // expects buffer sizes as an "int". | 159 // expects buffer sizes as an "int". |
160 base::CheckedNumeric<int> output_max_len = data.byte_length(); | 160 base::CheckedNumeric<int> output_max_len = data.byte_length(); |
161 if (!output_max_len.IsValid()) | 161 if (!output_max_len.IsValid()) |
162 return Status::ErrorDataTooLarge(); | 162 return Status::ErrorDataTooLarge(); |
163 | 163 |
164 const EVP_CIPHER* const cipher = GetAESCipherByKeyLength(raw_key.size()); | 164 const EVP_CIPHER* const cipher = GetAESCipherByKeyLength(raw_key.size()); |
165 if (!cipher) | 165 if (!cipher) |
166 return Status::ErrorUnexpected(); | 166 return Status::ErrorUnexpected(); |
167 | 167 |
168 const CryptoData counter_block(params->counter()); | 168 const CryptoData counter_block(params->counter()); |
169 buffer->resize(output_max_len.ValueOrDie()); | 169 buffer->resize(base::ValueOrDieForType<size_t>(output_max_len)); |
170 | 170 |
171 // The total number of possible counter values is pow(2, counter_length_bits) | 171 // The total number of possible counter values is pow(2, counter_length_bits) |
172 bssl::UniquePtr<BIGNUM> num_counter_values(BN_new()); | 172 bssl::UniquePtr<BIGNUM> num_counter_values(BN_new()); |
173 if (!BN_lshift(num_counter_values.get(), BN_value_one(), counter_length_bits)) | 173 if (!BN_lshift(num_counter_values.get(), BN_value_one(), counter_length_bits)) |
174 return Status::ErrorUnexpected(); | 174 return Status::ErrorUnexpected(); |
175 | 175 |
176 bssl::UniquePtr<BIGNUM> current_counter = | 176 bssl::UniquePtr<BIGNUM> current_counter = |
177 GetCounter(counter_block, counter_length_bits); | 177 GetCounter(counter_block, counter_length_bits); |
178 | 178 |
179 // The number of AES blocks needed for encryption/decryption. The counter is | 179 // The number of AES blocks needed for encryption/decryption. The counter is |
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254 } | 254 } |
255 }; | 255 }; |
256 | 256 |
257 } // namespace | 257 } // namespace |
258 | 258 |
259 std::unique_ptr<AlgorithmImplementation> CreateAesCtrImplementation() { | 259 std::unique_ptr<AlgorithmImplementation> CreateAesCtrImplementation() { |
260 return base::WrapUnique(new AesCtrImplementation); | 260 return base::WrapUnique(new AesCtrImplementation); |
261 } | 261 } |
262 | 262 |
263 } // namespace webcrypto | 263 } // namespace webcrypto |
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