blob: f9c0e6049d40e38162c945c86fb5b78475c336fc (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
|
// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Utility class for calculating the HMAC for a given message. We currently
// only support SHA1 for the hash algorithm, but this can be extended easily.
#ifndef BASE_HMAC_H_
#define BASE_HMAC_H_
#include "build/build_config.h"
#if defined(OS_WIN)
#include <windows.h>
#include <wincrypt.h>
#endif
#include <string>
#include "base/basictypes.h"
namespace base {
class HMAC {
public:
// The set of supported hash functions. Extend as required.
enum HashAlgorithm {
SHA1
};
HMAC(HashAlgorithm hash_alg, const unsigned char* key, int key_length);
~HMAC();
// Calculates the HMAC for the message in |data| using the algorithm and key
// supplied to the constructor. The HMAC is returned in |digest|, which
// has |digest_length| bytes of storage available.
bool Sign(const std::string& data, unsigned char* digest, int digest_length);
private:
#if defined(OS_POSIX)
HashAlgorithm hash_alg_;
std::string key_;
#elif defined(OS_WIN)
// Import the key so that we don't have to store it ourself.
void ImportKey(const unsigned char* key, int key_length);
// Returns the SHA1 hash of 'data' and 'key' in 'digest'. If there was any
// error in the calculation, this method returns false, otherwise true.
bool SignWithSHA1(const std::string& data,
unsigned char* digest,
int digest_length);
// The hash algorithm to use.
HashAlgorithm hash_alg_;
// Windows Crypt API resources.
HCRYPTPROV provider_;
HCRYPTHASH hash_;
HCRYPTKEY hkey_;
#endif // OS_WIN
DISALLOW_COPY_AND_ASSIGN(HMAC);
};
} // namespace base
#endif // BASE_HMAC_H_
|
