webcrypto: Add ECDSA algorithm (chromium-side)

content/child/webcrypto/jwk.cc

 // Copyright 2014 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 "content/child/webcrypto/jwk.h"
 
 #include "base/base64.h"
 #include "base/json/json_reader.h"
 #include "base/json/json_writer.h"
 #include "base/stl_util.h"
@@ skipping 430 matching lines @@
   if (has_jwk_alg && jwk_alg_value != expected_alg)
     return Status::ErrorJwkAlgorithmInconsistent();
 
   return Status::Success();
 }
 
 JwkWriter::JwkWriter(const std::string& algorithm,
                      bool extractable,
                      blink::WebCryptoKeyUsageMask usages,
                      const std::string& kty) {
-  dict_.SetString("alg", algorithm);
+  if (!algorithm.empty())
+    dict_.SetString("alg", algorithm);
   dict_.Set("key_ops", CreateJwkKeyOpsFromWebCryptoUsages(usages));
   dict_.SetBoolean("ext", extractable);
   dict_.SetString("kty", kty);
 }
 
 void JwkWriter::SetString(const std::string& member_name,
                           const std::string& value) {
   dict_.SetString(member_name, value);
 }
 
@@ skipping 240 matching lines @@
 
 std::string Base64EncodeUrlSafe(const std::vector<uint8_t>& input) {
   const base::StringPiece string_piece(
       reinterpret_cast<const char*>(vector_as_array(&input)), input.size());
   return Base64EncodeUrlSafe(string_piece);
 }
 
 }  // namespace webcrypto
 
 }  // namespace content