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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 #ifndef CRYPTO_ENCRYPTOR_H_ | 5 #ifndef CRYPTO_ENCRYPTOR_H_ |
6 #define CRYPTO_ENCRYPTOR_H_ | 6 #define CRYPTO_ENCRYPTOR_H_ |
7 #pragma once | 7 #pragma once |
8 | 8 |
9 #include <string> | 9 #include <string> |
10 | 10 |
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54 uint64 components64[2]; | 54 uint64 components64[2]; |
55 } counter_; | 55 } counter_; |
56 }; | 56 }; |
57 | 57 |
58 Encryptor(); | 58 Encryptor(); |
59 virtual ~Encryptor(); | 59 virtual ~Encryptor(); |
60 | 60 |
61 // Initializes the encryptor using |key| and |iv|. Returns false if either the | 61 // Initializes the encryptor using |key| and |iv|. Returns false if either the |
62 // key or the initialization vector cannot be used. | 62 // key or the initialization vector cannot be used. |
63 // | 63 // |
64 // When |mode| is CTR then |iv| should be empty. | 64 // If |mode| is CBC, |iv| must not be empty; if it is CTR, then |iv| must be |
| 65 // empty. |
65 bool Init(SymmetricKey* key, Mode mode, const base::StringPiece& iv); | 66 bool Init(SymmetricKey* key, Mode mode, const base::StringPiece& iv); |
66 | 67 |
67 // Encrypts |plaintext| into |ciphertext|. | 68 // Encrypts |plaintext| into |ciphertext|. |plaintext| may only be empty if |
| 69 // the mode is CBC. |
68 bool Encrypt(const base::StringPiece& plaintext, std::string* ciphertext); | 70 bool Encrypt(const base::StringPiece& plaintext, std::string* ciphertext); |
69 | 71 |
70 // Decrypts |ciphertext| into |plaintext|. | 72 // Decrypts |ciphertext| into |plaintext|. |ciphertext| must not be empty. |
71 bool Decrypt(const base::StringPiece& ciphertext, std::string* plaintext); | 73 bool Decrypt(const base::StringPiece& ciphertext, std::string* plaintext); |
72 | 74 |
73 // Sets the counter value when in CTR mode. Currently only 128-bits | 75 // Sets the counter value when in CTR mode. Currently only 128-bits |
74 // counter value is supported. | 76 // counter value is supported. |
75 // | 77 // |
76 // Returns true only if update was successful. | 78 // Returns true only if update was successful. |
77 bool SetCounter(const base::StringPiece& counter); | 79 bool SetCounter(const base::StringPiece& counter); |
78 | 80 |
79 // TODO(albertb): Support streaming encryption. | 81 // TODO(albertb): Support streaming encryption. |
80 | 82 |
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128 std::string iv_; | 130 std::string iv_; |
129 #elif defined(OS_WIN) | 131 #elif defined(OS_WIN) |
130 ScopedHCRYPTKEY capi_key_; | 132 ScopedHCRYPTKEY capi_key_; |
131 DWORD block_size_; | 133 DWORD block_size_; |
132 #endif | 134 #endif |
133 }; | 135 }; |
134 | 136 |
135 } // namespace crypto | 137 } // namespace crypto |
136 | 138 |
137 #endif // CRYPTO_ENCRYPTOR_H_ | 139 #endif // CRYPTO_ENCRYPTOR_H_ |
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