Add a utility method to convert SPKI from DER to JWK, so far implemented only for EC P256v1 (which …

net/cert/jwk_serializer.h

Index: net/cert/jwk_serializer.h
diff --git a/net/cert/jwk_serializer.h b/net/cert/jwk_serializer.h
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+// Copyright (c) 2013 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_CERT_JWK_SERIALIZER_H_
+#define NET_CERT_JWK_SERIALIZER_H_
+
+#include "base/strings/string_piece.h"
+#include "net/base/net_export.h"
+
+namespace base {
+class DictionaryValue;
+}
+
+namespace net {
+
+namespace JwkSerializer {
+
+// Converts a subject public key info from DER to JWK.
+// See http://tools.ietf.org/html/draft-ietf-jose-json-web-algorithms-13 for
+// the output format.
+NET_EXPORT_PRIVATE bool ConvertSpkiFromDerToJwk(
+    const base::StringPiece& spki_der,
+    base::DictionaryValue* public_key_jwk);
+
+} // namespace JwkSerializer
+
+} // namespace net
+
+#endif  // NET_CERT_JWK_SERIALIZER_H_