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
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
|
// Copyright (c) 2011 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.
#ifndef CRYPTO_SCOPED_CAPI_TYPES_H_
#define CRYPTO_SCOPED_CAPI_TYPES_H_
#pragma once
#include <windows.h>
#include <wincrypt.h>
#include <algorithm>
#include "base/logging.h"
namespace crypto {
// Simple destructor for the Free family of CryptoAPI functions, such as
// CryptDestroyHash, which take only a single argument to release.
template <typename CAPIHandle, BOOL (WINAPI *Destroyer)(CAPIHandle)>
struct CAPIDestroyer {
void operator()(CAPIHandle handle) const {
if (handle) {
BOOL ok = Destroyer(handle);
DCHECK(ok);
}
}
};
// Destructor for the Close/Release family of CryptoAPI functions, which take
// a second DWORD parameter indicating flags to use when closing or releasing.
// This includes functions like CertCloseStore or CryptReleaseContext.
template <typename CAPIHandle, BOOL (WINAPI *Destroyer)(CAPIHandle, DWORD),
DWORD flags>
struct CAPIDestroyerWithFlags {
void operator()(CAPIHandle handle) const {
if (handle) {
BOOL ok = Destroyer(handle, flags);
DCHECK(ok);
}
}
};
// scoped_ptr-like class for the CryptoAPI cryptography and certificate
// handles. Because these handles are defined as integer types, and not
// pointers, the existing scoped classes, such as scoped_ptr_malloc, are
// insufficient. The semantics are the same as scoped_ptr.
template <class CAPIHandle, typename FreeProc>
class ScopedCAPIHandle {
public:
explicit ScopedCAPIHandle(CAPIHandle handle = NULL) : handle_(handle) {}
~ScopedCAPIHandle() {
free_(handle_);
}
void reset(CAPIHandle handle = NULL) {
if (handle_ != handle) {
free_(handle_);
handle_ = handle;
}
}
operator CAPIHandle() const { return handle_; }
CAPIHandle get() const { return handle_; }
CAPIHandle* receive() {
CHECK(handle_ == NULL);
return &handle_;
}
bool operator==(CAPIHandle handle) const {
return handle_ == handle;
}
bool operator!=(CAPIHandle handle) const {
return handle_ != handle;
}
void swap(ScopedCAPIHandle& b) {
CAPIHandle tmp = b.handle_;
b.handle_ = handle_;
handle_ = tmp;
}
CAPIHandle release() {
CAPIHandle tmp = handle_;
handle_ = NULL;
return tmp;
}
private:
CAPIHandle handle_;
static const FreeProc free_;
DISALLOW_COPY_AND_ASSIGN(ScopedCAPIHandle);
};
template<class CH, typename FP>
const FP ScopedCAPIHandle<CH, FP>::free_ = FP();
template<class CH, typename FP> inline
bool operator==(CH h, const ScopedCAPIHandle<CH, FP>& b) {
return h == b.get();
}
template<class CH, typename FP> inline
bool operator!=(CH h, const ScopedCAPIHandle<CH, FP>& b) {
return h != b.get();
}
typedef ScopedCAPIHandle<
HCRYPTPROV,
CAPIDestroyerWithFlags<HCRYPTPROV,
CryptReleaseContext, 0> > ScopedHCRYPTPROV;
typedef ScopedCAPIHandle<
HCRYPTKEY, CAPIDestroyer<HCRYPTKEY, CryptDestroyKey> > ScopedHCRYPTKEY;
typedef ScopedCAPIHandle<
HCRYPTHASH, CAPIDestroyer<HCRYPTHASH, CryptDestroyHash> > ScopedHCRYPTHASH;
} // namespace crypto
#endif // CRYPTO_SCOPED_CAPI_TYPES_H_
|
