[Chromoting] Factor out common code for pin hashing.

remoting/host/pin_hash.h

Index: remoting/host/pin_hash.h
diff --git a/remoting/host/pin_hash.h b/remoting/host/pin_hash.h
new file mode 100644
index 0000000000000000000000000000000000000000..5fd3c813e0435019d5dc36393c8b74b4899cb66c
--- /dev/null
+++ b/remoting/host/pin_hash.h
@@ -0,0 +1,17 @@
+// 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 REMOTING_HOST_PIN_HASH_H_
+#define REMOTING_HOST_PIN_HASH_H_
+
+#include <string>
+
+namespace remoting {
+
+// Hashes a host ID and a PIN.

[Wez, 2012/04/30 23:13:57]

Can we reword to indicate that it specifically produces a hash in the form used
by Me2Me hosts?

[simonmorris, 2012/05/01 00:25:55]

Done.

+std::string GetPinHash(const std::string& host_id, const std::string& pin);

[Wez, 2012/04/30 23:13:57]

nit: GetPinHash -> MakePinHash() / MakeHostPinHash() / MakeMe2MeHostHash()?

[simonmorris, 2012/05/01 00:25:55]

Done.

+
+}  // namespace remoting
+
+#endif  // REMOTING_HOST_PIN_HASH_