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| 1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2011 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 "crypto/encryptor.h" | 5 #include "crypto/encryptor.h" |
| 6 | 6 |
| 7 #include <openssl/aes.h> | 7 #include <openssl/aes.h> |
| 8 #include <openssl/evp.h> | 8 #include <openssl/evp.h> |
| 9 #include <stddef.h> |
| 10 #include <stdint.h> |
| 9 | 11 |
| 10 #include "base/logging.h" | 12 #include "base/logging.h" |
| 11 #include "base/strings/string_util.h" | 13 #include "base/strings/string_util.h" |
| 12 #include "crypto/openssl_util.h" | 14 #include "crypto/openssl_util.h" |
| 13 #include "crypto/symmetric_key.h" | 15 #include "crypto/symmetric_key.h" |
| 14 | 16 |
| 15 namespace crypto { | 17 namespace crypto { |
| 16 | 18 |
| 17 namespace { | 19 namespace { |
| 18 | 20 |
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| 96 output->clear(); | 98 output->clear(); |
| 97 | 99 |
| 98 const EVP_CIPHER* cipher = GetCipherForKey(key_); | 100 const EVP_CIPHER* cipher = GetCipherForKey(key_); |
| 99 DCHECK(cipher); // Already handled in Init(); | 101 DCHECK(cipher); // Already handled in Init(); |
| 100 | 102 |
| 101 const std::string& key = key_->key(); | 103 const std::string& key = key_->key(); |
| 102 DCHECK_EQ(EVP_CIPHER_iv_length(cipher), iv_.length()); | 104 DCHECK_EQ(EVP_CIPHER_iv_length(cipher), iv_.length()); |
| 103 DCHECK_EQ(EVP_CIPHER_key_length(cipher), key.length()); | 105 DCHECK_EQ(EVP_CIPHER_key_length(cipher), key.length()); |
| 104 | 106 |
| 105 ScopedCipherCTX ctx; | 107 ScopedCipherCTX ctx; |
| 106 if (!EVP_CipherInit_ex(ctx.get(), cipher, NULL, | 108 if (!EVP_CipherInit_ex( |
| 107 reinterpret_cast<const uint8*>(key.data()), | 109 ctx.get(), cipher, NULL, reinterpret_cast<const uint8_t*>(key.data()), |
| 108 reinterpret_cast<const uint8*>(iv_.data()), | 110 reinterpret_cast<const uint8_t*>(iv_.data()), do_encrypt)) |
| 109 do_encrypt)) | |
| 110 return false; | 111 return false; |
| 111 | 112 |
| 112 // When encrypting, add another block size of space to allow for any padding. | 113 // When encrypting, add another block size of space to allow for any padding. |
| 113 const size_t output_size = input.size() + (do_encrypt ? iv_.size() : 0); | 114 const size_t output_size = input.size() + (do_encrypt ? iv_.size() : 0); |
| 114 CHECK_GT(output_size, 0u); | 115 CHECK_GT(output_size, 0u); |
| 115 CHECK_GT(output_size + 1, input.size()); | 116 CHECK_GT(output_size + 1, input.size()); |
| 116 uint8* out_ptr = | 117 uint8_t* out_ptr = |
| 117 reinterpret_cast<uint8*>(base::WriteInto(&result, output_size + 1)); | 118 reinterpret_cast<uint8_t*>(base::WriteInto(&result, output_size + 1)); |
| 118 int out_len; | 119 int out_len; |
| 119 if (!EVP_CipherUpdate(ctx.get(), out_ptr, &out_len, | 120 if (!EVP_CipherUpdate(ctx.get(), out_ptr, &out_len, |
| 120 reinterpret_cast<const uint8*>(input.data()), | 121 reinterpret_cast<const uint8_t*>(input.data()), |
| 121 input.length())) | 122 input.length())) |
| 122 return false; | 123 return false; |
| 123 | 124 |
| 124 // Write out the final block plus padding (if any) to the end of the data | 125 // Write out the final block plus padding (if any) to the end of the data |
| 125 // just written. | 126 // just written. |
| 126 int tail_len; | 127 int tail_len; |
| 127 if (!EVP_CipherFinal_ex(ctx.get(), out_ptr + out_len, &tail_len)) | 128 if (!EVP_CipherFinal_ex(ctx.get(), out_ptr + out_len, &tail_len)) |
| 128 return false; | 129 return false; |
| 129 | 130 |
| 130 out_len += tail_len; | 131 out_len += tail_len; |
| 131 DCHECK_LE(out_len, static_cast<int>(output_size)); | 132 DCHECK_LE(out_len, static_cast<int>(output_size)); |
| 132 result.resize(out_len); | 133 result.resize(out_len); |
| 133 | 134 |
| 134 output->swap(result); | 135 output->swap(result); |
| 135 return true; | 136 return true; |
| 136 } | 137 } |
| 137 | 138 |
| 138 bool Encryptor::CryptCTR(bool do_encrypt, | 139 bool Encryptor::CryptCTR(bool do_encrypt, |
| 139 const base::StringPiece& input, | 140 const base::StringPiece& input, |
| 140 std::string* output) { | 141 std::string* output) { |
| 141 if (!counter_.get()) { | 142 if (!counter_.get()) { |
| 142 LOG(ERROR) << "Counter value not set in CTR mode."; | 143 LOG(ERROR) << "Counter value not set in CTR mode."; |
| 143 return false; | 144 return false; |
| 144 } | 145 } |
| 145 | 146 |
| 146 AES_KEY aes_key; | 147 AES_KEY aes_key; |
| 147 if (AES_set_encrypt_key(reinterpret_cast<const uint8*>(key_->key().data()), | 148 if (AES_set_encrypt_key(reinterpret_cast<const uint8_t*>(key_->key().data()), |
| 148 key_->key().size() * 8, &aes_key) != 0) { | 149 key_->key().size() * 8, &aes_key) != 0) { |
| 149 return false; | 150 return false; |
| 150 } | 151 } |
| 151 | 152 |
| 152 const size_t out_size = input.size(); | 153 const size_t out_size = input.size(); |
| 153 CHECK_GT(out_size, 0u); | 154 CHECK_GT(out_size, 0u); |
| 154 CHECK_GT(out_size + 1, input.size()); | 155 CHECK_GT(out_size + 1, input.size()); |
| 155 | 156 |
| 156 std::string result; | 157 std::string result; |
| 157 uint8* out_ptr = | 158 uint8_t* out_ptr = |
| 158 reinterpret_cast<uint8*>(base::WriteInto(&result, out_size + 1)); | 159 reinterpret_cast<uint8_t*>(base::WriteInto(&result, out_size + 1)); |
| 159 | 160 |
| 160 uint8_t ivec[AES_BLOCK_SIZE] = { 0 }; | 161 uint8_t ivec[AES_BLOCK_SIZE] = { 0 }; |
| 161 uint8_t ecount_buf[AES_BLOCK_SIZE] = { 0 }; | 162 uint8_t ecount_buf[AES_BLOCK_SIZE] = { 0 }; |
| 162 unsigned int block_offset = 0; | 163 unsigned int block_offset = 0; |
| 163 | 164 |
| 164 counter_->Write(ivec); | 165 counter_->Write(ivec); |
| 165 | 166 |
| 166 AES_ctr128_encrypt(reinterpret_cast<const uint8*>(input.data()), out_ptr, | 167 AES_ctr128_encrypt(reinterpret_cast<const uint8_t*>(input.data()), out_ptr, |
| 167 input.size(), &aes_key, ivec, ecount_buf, &block_offset); | 168 input.size(), &aes_key, ivec, ecount_buf, &block_offset); |
| 168 | 169 |
| 169 // AES_ctr128_encrypt() updates |ivec|. Update the |counter_| here. | 170 // AES_ctr128_encrypt() updates |ivec|. Update the |counter_| here. |
| 170 SetCounter(base::StringPiece(reinterpret_cast<const char*>(ivec), | 171 SetCounter(base::StringPiece(reinterpret_cast<const char*>(ivec), |
| 171 AES_BLOCK_SIZE)); | 172 AES_BLOCK_SIZE)); |
| 172 | 173 |
| 173 output->swap(result); | 174 output->swap(result); |
| 174 return true; | 175 return true; |
| 175 } | 176 } |
| 176 | 177 |
| 177 } // namespace crypto | 178 } // namespace crypto |
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