Adds first cut implementation of a private key store abstraction for openssl

net/base/openssl_private_key_store.h

Index: net/base/openssl_private_key_store.h
diff --git a/net/base/openssl_private_key_store.h b/net/base/openssl_private_key_store.h
new file mode 100644
index 0000000000000000000000000000000000000000..17f8fe1b05215271b2006fa09f79e241df63ee59
--- /dev/null
+++ b/net/base/openssl_private_key_store.h
@@ -0,0 +1,51 @@
+// 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.
+
+#ifndef NET_BASE_OPENSSL_PRIVATE_KEY_STORE_H_
+#define NET_BASE_OPENSSL_PRIVATE_KEY_STORE_H_
+#pragma once
+
+#include "base/basictypes.h"
+
+typedef struct evp_pkey_st EVP_PKEY;
+
+class GURL;
+
+namespace net {
+
+// Defines an abstract store for private keys; the OpenSSL library does not
+// provide this service so it is left to individual platforms to provide it.
+//
+// The contract is that the private key will be stored in an appropriate secure
+// system location, and be available to the SSLClientSocketOpenSSL when using a
+// client certificate created against the associated public key for client
+// authentication.
+class OpenSSLPrivateKeyStore {
+ public:
+  // Platforms must define this factory function as appropriate.
+  static OpenSSLPrivateKeyStore* GetInstance();
+
+  virtual ~OpenSSLPrivateKeyStore() {}
+
+  // Called to store a private key generated via <keygen> while visiting |url|.
+  // Does not takes ownership of |pkey|, the caller reamins responsible to
+  // EVP_PKEY_free it. (Internally, a copy maybe made or the reference count
+  // incremented).
+  // Returns false if an error occurred whilst attempting to store the key.
+  virtual bool StorePrivateKey(const GURL& url, EVP_PKEY* pkey) = 0;
+
+  // Given a |public_key| part returns the corresponding private key, or NULL
+  // if no key found. Does NOT return ownership.
+  virtual EVP_PKEY* FetchPrivateKey(EVP_PKEY* public_key) = 0;
+
+ protected:
+  OpenSSLPrivateKeyStore() {}
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(OpenSSLPrivateKeyStore);
+};
+
+} // namespace net
+
+#endif  // NET_BASE_OPENSSL_PRIVATE_KEY_STORE_H_