Implement CUP signing in UpdateClient.

components/update_client/client_update_protocol_ecdsa_unittest.cc

 // Copyright 2016 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 <stdint.h>
 
 #include <limits>
 #include <vector>
 
 #include "base/base64.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/string_piece.h"
 #include "base/strings/stringprintf.h"
 #include "components/update_client/client_update_protocol_ecdsa.h"
 #include "crypto/random.h"
 #include "crypto/secure_util.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
+namespace update_client {
+
 namespace {
 
 std::string GetPublicKeyForTesting() {
   // How to generate this key:
   //   openssl ecparam -genkey -name prime256v1 -out ecpriv.pem
   //   openssl ec -in ecpriv.pem -pubout -out ecpub.pem
 
   static const char kCupEcdsaTestKey_Base64[] =
       "MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEJNOjKyN6UHyUGkGow+xCmQthQXUo"
       "9sd7RIXSpVIM768UlbGb/5JrnISjSYejCc/pxQooI6mJTzWL3pZb5TA1DA==";
@@ skipping 256 matching lines @@
       ":2727bc2b3c33feb6800a830f4055901dd87d65a84184c5fbeb3f816db0a243f5"));
 
   // Failure case: Request/response are intact, but the signature is invalid
   // because it was signed against a different nonce (67890).
   EXPECT_FALSE(CUP().ValidateResponse(
       "Response_A",
       "3046022100d3bbb1fb4451c8e04a07fe95404cc39121ed0e0bc084f87de19d52eee50a97"
       "bf022100dd7d41d467be2af98d9116b0c7ba09740d54578c02a02f74da5f089834be3403"
       ":2727bc2b3c33feb6800a830f4055901dd87d65a84184c5fbeb3f816db0a243f5"));
 }
+
+}  // namespace update_client