crypto/capi_util.h

   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_CAPI_UTIL_H_
   6 #define CRYPTO_CAPI_UTIL_H_
   7 #pragma once
   8
   9 #include <windows.h>
  10 #include <wincrypt.h>
  11
  12 namespace crypto {
  13
  14 // CryptAcquireContext when passed CRYPT_NEWKEYSET or CRYPT_DELETEKEYSET in
  15 // flags is not thread-safe. For such calls, we create a global lock to
  16 // synchronize it.
  17 //
  18 // From "Threading Issues with Cryptographic Service Providers",
  19 // <http://msdn.microsoft.com/en-us/library/aa388149(v=VS.85).aspx>:
  20 //
  21 // "The CryptAcquireContext function is generally thread safe unless
  22 // CRYPT_NEWKEYSET or CRYPT_DELETEKEYSET is specified in the dwFlags
  23 // parameter."
  24 BOOL CryptAcquireContextLocked(HCRYPTPROV* prov,
  25                                LPCWSTR container,
  26                                LPCWSTR provider,
  27                                DWORD prov_type,
  28                                DWORD flags);
  29
  30 }  // namespace crypto
  31
  32 #endif  // CRYPTO_CAPI_UTIL_H_