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crypto/capi_util.h

Index: crypto/capi_util.h
diff --git a/crypto/capi_util.h b/crypto/capi_util.h
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+// Copyright (c) 2012 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_CAPI_UTIL_H_
+#define CRYPTO_CAPI_UTIL_H_
+
+#include <windows.h>
+
+#include "crypto/crypto_export.h"
+#include "crypto/wincrypt_shim.h"
+
+namespace crypto {
+
+// CryptAcquireContext when passed CRYPT_NEWKEYSET or CRYPT_DELETEKEYSET in
+// flags is not thread-safe. For such calls, we create a global lock to
+// synchronize it.
+//
+// From "Threading Issues with Cryptographic Service Providers",
+// <http://msdn.microsoft.com/en-us/library/aa388149(v=VS.85).aspx>:
+//
+// "The CryptAcquireContext function is generally thread safe unless
+// CRYPT_NEWKEYSET or CRYPT_DELETEKEYSET is specified in the dwFlags
+// parameter."
+CRYPTO_EXPORT BOOL CryptAcquireContextLocked(HCRYPTPROV* prov,
+                                             LPCWSTR container,
+                                             LPCWSTR provider,
+                                             DWORD prov_type,
+                                             DWORD flags);
+
+// Wrappers of malloc and free for CryptoAPI routines that need memory
+// allocators, such as in CRYPT_DECODE_PARA. Such routines require WINAPI
+// calling conventions.
+CRYPTO_EXPORT void* WINAPI CryptAlloc(size_t size);
+CRYPTO_EXPORT void WINAPI CryptFree(void* p);
+
+}  // namespace crypto
+
+#endif  // CRYPTO_CAPI_UTIL_H_