Implement TLS client auth in the OS X OpenSSL port.

net/socket/openssl_ssl_util.h

-// Copyright 2014 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 NET_SOCKET_OPENSSL_SSL_UTIL_H_
-#define NET_SOCKET_OPENSSL_SSL_UTIL_H_
-
-namespace crypto {
-class OpenSSLErrStackTracer;
-}
-
-namespace tracked_objects {
-class Location;
-}
-
-namespace net {
-
-// Puts a net error, |err|, on the error stack in OpenSSL. The file and line are
-// extracted from |posted_from|. The function code of the error is left as 0.
-void OpenSSLPutNetError(const tracked_objects::Location& posted_from, int err);
-
-// Utility to construct the appropriate set & clear masks for use the OpenSSL
-// options and mode configuration functions. (SSL_set_options etc)
-struct SslSetClearMask {
-  SslSetClearMask();
-  void ConfigureFlag(long flag, bool state);
-
-  long set_mask;
-  long clear_mask;
-};
-
-// Converts an OpenSSL error code into a net error code, walking the OpenSSL
-// error stack if needed. Note that |tracer| is not currently used in the
-// implementation, but is passed in anyway as this ensures the caller will clear
-// any residual codes left on the error stack.
-int MapOpenSSLError(int err, const crypto::OpenSSLErrStackTracer& tracer);
-
-}  // namespace net
-
-#endif  // NET_SOCKET_OPENSSL_SSL_UTIL_H_