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diff --git a/net/ssl/ssl_client_auth_cache.h b/net/ssl/ssl_client_auth_cache.h
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+++ b/net/ssl/ssl_client_auth_cache.h
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+// 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.
+
+#ifndef NET_SSL_SSL_CLIENT_AUTH_CACHE_H_
+#define NET_SSL_SSL_CLIENT_AUTH_CACHE_H_
+
+#include <map>
+#include <string>
+
+#include "base/compiler_specific.h"
+#include "base/memory/ref_counted.h"
+#include "net/base/cert_database.h"
+#include "net/base/net_export.h"
+
+namespace net {
+
+class X509Certificate;
+
+// The SSLClientAuthCache class is a simple cache structure to store SSL
+// client certificates. Provides lookup, insertion, and deletion of entries.
+// The parameter for doing lookups, insertions, and deletions is the server's
+// host and port.
+//
+// TODO(wtc): This class is based on FtpAuthCache.  We can extract the common
+// code to a template class.
+class NET_EXPORT_PRIVATE SSLClientAuthCache : public CertDatabase::Observer {
+ public:
+  SSLClientAuthCache();
+  virtual ~SSLClientAuthCache();
+
+  // Checks for a client certificate preference for SSL server at |server|.
+  // Returns true if a preference is found, and sets |*certificate| to the
+  // desired client certificate. The desired certificate may be NULL, which
+  // indicates a preference to not send any certificate to |server|.
+  // If a certificate preference is not found, returns false.
+  bool Lookup(const std::string& server,
+              scoped_refptr<X509Certificate>* certificate);
+
+  // Add a client certificate for |server| to the cache. If there is already
+  // a client certificate for |server|, it will be overwritten. A NULL
+  // |client_cert| indicates a preference that no client certificate should
+  // be sent to |server|.
+  void Add(const std::string& server, X509Certificate* client_cert);
+
+  // Remove the client certificate for |server| from the cache, if one exists.
+  void Remove(const std::string& server);
+
+  // CertDatabase::Observer methods:
+  virtual void OnCertAdded(const X509Certificate* cert) OVERRIDE;
+
+ private:
+  typedef std::string AuthCacheKey;
+  typedef scoped_refptr<X509Certificate> AuthCacheValue;
+  typedef std::map<AuthCacheKey, AuthCacheValue> AuthCacheMap;
+
+  // internal representation of cache, an STL map.
+  AuthCacheMap cache_;
+};
+
+}  // namespace net
+
+#endif  // NET_SSL_SSL_CLIENT_AUTH_CACHE_H_