Added crypto random-number generator

crypto/random.h

+// 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_RANDOM_H_
+#define CRYPTO_RANDOM_H_
+
+#include <stdlib.h>
+
+#include "crypto/crypto_export.h"
+
+namespace crypto {
+
+// Fills the given buffer with |length| random bytes of cryptographically
+// secure random numbers.
+// |length| must be positive.
+CRYPTO_EXPORT void RandBytes(void *bytes, size_t length);
+
+}
+
+#endif