crypto/capi_util.h

   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
   3 // found in the LICENSE file.
   4
   5 #ifndef CRYPTO_CAPI_UTIL_H_
   6 #define CRYPTO_CAPI_UTIL_H_
   7
   8 #include <windows.h>
   9 #include <wincrypt.h>
  10
  11 #include "crypto/crypto_export.h"
  12
  13 namespace crypto {
  14
  15 // CryptAcquireContext when passed CRYPT_NEWKEYSET or CRYPT_DELETEKEYSET in
  16 // flags is not thread-safe. For such calls, we create a global lock to
  17 // synchronize it.
  18 //
  19 // From "Threading Issues with Cryptographic Service Providers",
  20 // <http://msdn.microsoft.com/en-us/library/aa388149(v=VS.85).aspx>:
  21 //
  22 // "The CryptAcquireContext function is generally thread safe unless
  23 // CRYPT_NEWKEYSET or CRYPT_DELETEKEYSET is specified in the dwFlags
  24 // parameter."
  25 CRYPTO_EXPORT BOOL CryptAcquireContextLocked(HCRYPTPROV* prov,
  26                                              LPCWSTR container,
  27                                              LPCWSTR provider,
  28                                              DWORD prov_type,
  29                                              DWORD flags);
  30
  31 // Wrappers of malloc and free for CryptoAPI routines that need memory
  32 // allocators, such as in CRYPT_DECODE_PARA. Such routines require WINAPI
  33 // calling conventions.
  34 CRYPTO_EXPORT void* WINAPI CryptAlloc(size_t size);
  35 CRYPTO_EXPORT void WINAPI CryptFree(void* p);
  36
  37 }  // namespace crypto
  38
  39 #endif  // CRYPTO_CAPI_UTIL_H_