1 files changed, 49 insertions, 0 deletions
diff --git a/crypto/capi_util.cc b/crypto/capi_util.cc
new file mode 100644
index 0000000..7593f39
--- /dev/null
+++ b/crypto/capi_util.cc
@@ -0,0 +1,49 @@
+// 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.
+
+#include "crypto/capi_util.h"
+
+#include "base/basictypes.h"
+#include "base/memory/singleton.h"
+#include "base/synchronization/lock.h"
+
+namespace {
+
+class CAPIUtilSingleton {
+ public:
+  static CAPIUtilSingleton* GetInstance() {
+    return Singleton<CAPIUtilSingleton>::get();
+  }
+
+  // Returns a lock to guard calls to CryptAcquireContext with
+  // CRYPT_DELETEKEYSET or CRYPT_NEWKEYSET.
+  base::Lock& acquire_context_lock() {
+    return acquire_context_lock_;
+  }
+
+ private:
+  friend class Singleton<CAPIUtilSingleton>;
+  friend struct DefaultSingletonTraits<CAPIUtilSingleton>;
+
+  CAPIUtilSingleton() {}
+
+  base::Lock acquire_context_lock_;
+
+  DISALLOW_COPY_AND_ASSIGN(CAPIUtilSingleton);
+};
+
+}  // namespace
+
+namespace crypto {
+
+BOOL CryptAcquireContextLocked(HCRYPTPROV* prov,
+                               LPCWSTR container,
+                               LPCWSTR provider,
+                               DWORD prov_type,
+                               DWORD flags) {
+  base::AutoLock lock(CAPIUtilSingleton::GetInstance()->acquire_context_lock());
+  return CryptAcquireContext(prov, container, provider, prov_type, flags);
+}
+
+}  // namespace crypto