[Chromoting] Factor out common code for pin hashing.

remoting/host/pin_hash_unittest.cc

+// 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.
+
+#include <set>
+#include <string>
+
+#include "remoting/host/pin_hash.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace remoting {
+
+class PinHashTest : public testing::Test {
+};
+
+TEST_F(PinHashTest, KnownHashValue) {
+  std::string hash = MakeHostPinHash("Host ID", "1234");
+  ASSERT_EQ("hmac:bk6RVRFLpLO89mr4QPHSg8CemUUtI90r2F0VfvTmWLI=", hash);
+}
+
+TEST_F(PinHashTest, VerifyHostPinHash) {
+  std::string host_id("Host ID");
+  std::string pin("1234");
+  ASSERT_TRUE(VerifyHostPinHash(MakeHostPinHash(host_id, pin), host_id, pin));

[Wez, 2012/05/01 01:02:36]

Verify that it returns false if you supply different pins or hosts to the two
functions?

[simonmorris, 2012/05/01 01:11:55]

Done.

+}
+
+}  // namespace remoting