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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 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 | 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_SYMMETRIC_KEY_H_ | 5 #ifndef CRYPTO_SYMMETRIC_KEY_H_ |
6 #define CRYPTO_SYMMETRIC_KEY_H_ | 6 #define CRYPTO_SYMMETRIC_KEY_H_ |
7 | 7 |
8 #include <stddef.h> | 8 #include <stddef.h> |
9 | 9 |
10 #include <string> | 10 #include <string> |
11 | 11 |
12 #include "base/macros.h" | 12 #include "base/macros.h" |
13 #include "build/build_config.h" | 13 #include "build/build_config.h" |
14 #include "crypto/crypto_export.h" | 14 #include "crypto/crypto_export.h" |
15 | 15 |
16 #if defined(NACL_WIN64) | |
17 // See comments for crypto_nacl_win64 in crypto.gyp. | |
18 // Must test for NACL_WIN64 before OS_WIN since former is a subset of latter. | |
19 #include "crypto/scoped_capi_types.h" | |
20 #endif | |
21 | |
22 namespace crypto { | 16 namespace crypto { |
23 | 17 |
24 // Wraps a platform-specific symmetric key and allows it to be held in a | 18 // Wraps a platform-specific symmetric key and allows it to be held in a |
25 // scoped_ptr. | 19 // scoped_ptr. |
26 class CRYPTO_EXPORT SymmetricKey { | 20 class CRYPTO_EXPORT SymmetricKey { |
27 public: | 21 public: |
28 // Defines the algorithm that a key will be used with. See also | 22 // Defines the algorithm that a key will be used with. See also |
29 // classs Encrptor. | 23 // classs Encrptor. |
30 enum Algorithm { | 24 enum Algorithm { |
31 AES, | 25 AES, |
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50 const std::string& salt, | 44 const std::string& salt, |
51 size_t iterations, | 45 size_t iterations, |
52 size_t key_size_in_bits); | 46 size_t key_size_in_bits); |
53 | 47 |
54 // Imports an array of key bytes in |raw_key|. This key may have been | 48 // Imports an array of key bytes in |raw_key|. This key may have been |
55 // generated by GenerateRandomKey or DeriveKeyFromPassword and exported with | 49 // generated by GenerateRandomKey or DeriveKeyFromPassword and exported with |
56 // GetRawKey, or via another compatible method. The key must be of suitable | 50 // GetRawKey, or via another compatible method. The key must be of suitable |
57 // size for use with |algorithm|. The caller owns the returned SymmetricKey. | 51 // size for use with |algorithm|. The caller owns the returned SymmetricKey. |
58 static SymmetricKey* Import(Algorithm algorithm, const std::string& raw_key); | 52 static SymmetricKey* Import(Algorithm algorithm, const std::string& raw_key); |
59 | 53 |
60 #if defined(NACL_WIN64) | |
61 HCRYPTKEY key() const { return key_.get(); } | |
62 #else | |
63 const std::string& key() { return key_; } | 54 const std::string& key() { return key_; } |
64 #endif | |
65 | 55 |
66 // Extracts the raw key from the platform specific data. | 56 // Extracts the raw key from the platform specific data. |
67 // Warning: |raw_key| holds the raw key as bytes and thus must be handled | 57 // Warning: |raw_key| holds the raw key as bytes and thus must be handled |
68 // carefully. | 58 // carefully. |
69 bool GetRawKey(std::string* raw_key); | 59 bool GetRawKey(std::string* raw_key); |
70 | 60 |
71 private: | 61 private: |
72 #if defined(NACL_WIN64) | |
73 SymmetricKey(HCRYPTPROV provider, HCRYPTKEY key, | |
74 const void* key_data, size_t key_size_in_bytes); | |
75 | |
76 ScopedHCRYPTPROV provider_; | |
77 ScopedHCRYPTKEY key_; | |
78 | |
79 // Contains the raw key, if it is known during initialization and when it | |
80 // is likely that the associated |provider_| will be unable to export the | |
81 // |key_|. This is the case of HMAC keys when the key size exceeds 16 bytes | |
82 // when using the default RSA provider. | |
83 // TODO(rsleevi): See if KP_EFFECTIVE_KEYLEN is the reason why CryptExportKey | |
84 // fails with NTE_BAD_KEY/NTE_BAD_LEN | |
85 std::string raw_key_; | |
86 #else | |
87 SymmetricKey() {} | 62 SymmetricKey() {} |
88 std::string key_; | 63 std::string key_; |
89 #endif | |
90 | 64 |
91 DISALLOW_COPY_AND_ASSIGN(SymmetricKey); | 65 DISALLOW_COPY_AND_ASSIGN(SymmetricKey); |
92 }; | 66 }; |
93 | 67 |
94 } // namespace crypto | 68 } // namespace crypto |
95 | 69 |
96 #endif // CRYPTO_SYMMETRIC_KEY_H_ | 70 #endif // CRYPTO_SYMMETRIC_KEY_H_ |
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