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| 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 |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #ifndef CRYPTO_SCOPED_CAPI_TYPES_H_ |
| 6 #define CRYPTO_SCOPED_CAPI_TYPES_H_ |
| 7 #pragma once |
| 8 |
| 9 #include <windows.h> |
| 10 #include <wincrypt.h> |
| 11 |
| 12 #include <algorithm> |
| 13 |
| 14 #include "base/logging.h" |
| 15 |
| 16 namespace crypto { |
| 17 |
| 18 // Simple destructor for the Free family of CryptoAPI functions, such as |
| 19 // CryptDestroyHash, which take only a single argument to release. |
| 20 template <typename CAPIHandle, BOOL (WINAPI *Destroyer)(CAPIHandle)> |
| 21 struct CAPIDestroyer { |
| 22 void operator()(CAPIHandle handle) const { |
| 23 if (handle) { |
| 24 BOOL ok = Destroyer(handle); |
| 25 DCHECK(ok); |
| 26 } |
| 27 } |
| 28 }; |
| 29 |
| 30 // Destructor for the Close/Release family of CryptoAPI functions, which take |
| 31 // a second DWORD parameter indicating flags to use when closing or releasing. |
| 32 // This includes functions like CertCloseStore or CryptReleaseContext. |
| 33 template <typename CAPIHandle, BOOL (WINAPI *Destroyer)(CAPIHandle, DWORD), |
| 34 DWORD flags> |
| 35 struct CAPIDestroyerWithFlags { |
| 36 void operator()(CAPIHandle handle) const { |
| 37 if (handle) { |
| 38 BOOL ok = Destroyer(handle, flags); |
| 39 DCHECK(ok); |
| 40 } |
| 41 } |
| 42 }; |
| 43 |
| 44 // scoped_ptr-like class for the CryptoAPI cryptography and certificate |
| 45 // handles. Because these handles are defined as integer types, and not |
| 46 // pointers, the existing scoped classes, such as scoped_ptr_malloc, are |
| 47 // insufficient. The semantics are the same as scoped_ptr. |
| 48 template <class CAPIHandle, typename FreeProc> |
| 49 class ScopedCAPIHandle { |
| 50 public: |
| 51 explicit ScopedCAPIHandle(CAPIHandle handle = NULL) : handle_(handle) {} |
| 52 |
| 53 ~ScopedCAPIHandle() { |
| 54 free_(handle_); |
| 55 } |
| 56 |
| 57 void reset(CAPIHandle handle = NULL) { |
| 58 if (handle_ != handle) { |
| 59 free_(handle_); |
| 60 handle_ = handle; |
| 61 } |
| 62 } |
| 63 |
| 64 operator CAPIHandle() const { return handle_; } |
| 65 CAPIHandle get() const { return handle_; } |
| 66 |
| 67 CAPIHandle* receive() { |
| 68 CHECK(handle_ == NULL); |
| 69 return &handle_; |
| 70 } |
| 71 |
| 72 bool operator==(CAPIHandle handle) const { |
| 73 return handle_ == handle; |
| 74 } |
| 75 |
| 76 bool operator!=(CAPIHandle handle) const { |
| 77 return handle_ != handle; |
| 78 } |
| 79 |
| 80 void swap(ScopedCAPIHandle& b) { |
| 81 CAPIHandle tmp = b.handle_; |
| 82 b.handle_ = handle_; |
| 83 handle_ = tmp; |
| 84 } |
| 85 |
| 86 CAPIHandle release() { |
| 87 CAPIHandle tmp = handle_; |
| 88 handle_ = NULL; |
| 89 return tmp; |
| 90 } |
| 91 |
| 92 private: |
| 93 CAPIHandle handle_; |
| 94 static const FreeProc free_; |
| 95 |
| 96 DISALLOW_COPY_AND_ASSIGN(ScopedCAPIHandle); |
| 97 }; |
| 98 |
| 99 template<class CH, typename FP> |
| 100 const FP ScopedCAPIHandle<CH, FP>::free_ = FP(); |
| 101 |
| 102 template<class CH, typename FP> inline |
| 103 bool operator==(CH h, const ScopedCAPIHandle<CH, FP>& b) { |
| 104 return h == b.get(); |
| 105 } |
| 106 |
| 107 template<class CH, typename FP> inline |
| 108 bool operator!=(CH h, const ScopedCAPIHandle<CH, FP>& b) { |
| 109 return h != b.get(); |
| 110 } |
| 111 |
| 112 typedef ScopedCAPIHandle< |
| 113 HCRYPTPROV, |
| 114 CAPIDestroyerWithFlags<HCRYPTPROV, |
| 115 CryptReleaseContext, 0> > ScopedHCRYPTPROV; |
| 116 |
| 117 typedef ScopedCAPIHandle< |
| 118 HCRYPTKEY, CAPIDestroyer<HCRYPTKEY, CryptDestroyKey> > ScopedHCRYPTKEY; |
| 119 |
| 120 typedef ScopedCAPIHandle< |
| 121 HCRYPTHASH, CAPIDestroyer<HCRYPTHASH, CryptDestroyHash> > ScopedHCRYPTHASH; |
| 122 |
| 123 } // namespace crypto |
| 124 |
| 125 #endif // CRYPTO_SCOPED_CAPI_TYPES_H_ |
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