Implement symmetric key for openssl

base/openssl_util.cc

Index: base/openssl_util.cc
diff --git a/base/openssl_util.cc b/base/openssl_util.cc
new file mode 100644
index 0000000000000000000000000000000000000000..82da86836c2ac08e21071fea26b7f9702553a6a7
--- /dev/null
+++ b/base/openssl_util.cc
@@ -0,0 +1,31 @@
+// Copyright (c) 2010 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 "base/openssl_util.h"
+
+#include <openssl/err.h>
+
+#include "base/logging.h"
+
+namespace base {
+
+void ClearOpenSSLERRStack() {
+  if (logging::DEBUG_MODE && VLOG_IS_ON(1)) {
+    int error_num = ERR_get_error();
+    if (error_num == 0)
+      return;
+
+    DVLOG(1) << "OpenSSL ERR_get_error stack:";
+    char buf[140];
+    do {
+      ERR_error_string_n(error_num, buf, arraysize(buf));
+      DVLOG(1) << "\t" << error_num << ": " << buf;
+      error_num = ERR_get_error();
+    } while (error_num != 0);
+  } else {
+    ERR_clear_error();
+  }
+}
+
+}  // namespace base