[webcrypto] Add JWK RSA public key export for NSS.

content/child/webcrypto/webcrypto_util.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/webcrypto_util.h"
 
 #include "base/base64.h"
 #include "base/logging.h"
 #include "base/strings/stringprintf.h"
 #include "content/child/webcrypto/status.h"
@@ skipping 49 matching lines @@
 // inverse of the process above.
 std::string Base64EncodeUrlSafe(const base::StringPiece& input) {
   std::string output;
   base::Base64Encode(input, &output);
   std::replace(output.begin(), output.end(), '+', '-');
   std::replace(output.begin(), output.end(), '/', '_');
   output.erase(std::remove(output.begin(), output.end(), '='), output.end());
   return output;
 }
 
+std::string Base64EncodeUrlSafe(const std::vector<uint8>& input) {
+  const base::StringPiece string_piece(
+      reinterpret_cast<const char*>(Uint8VectorStart(input)), input.size());
+  return Base64EncodeUrlSafe(string_piece);
+}
+
 struct JwkToWebCryptoUsage {
   const char* const jwk_key_op;
   const blink::WebCryptoKeyUsage webcrypto_usage;
 };
 
 const JwkToWebCryptoUsage kJwkWebCryptoUsageMap[] = {
     {"encrypt", blink::WebCryptoKeyUsageEncrypt},
     {"decrypt", blink::WebCryptoKeyUsageDecrypt},
     {"deriveKey", blink::WebCryptoKeyUsageDeriveKey},
     // TODO(padolph): Add 'deriveBits' once supported by Blink.
@@ skipping 137 matching lines @@
           algorithm.id(), keylen_bytes * 8);
       return true;
     default:
       return false;
   }
 }
 
 }  // namespace webcrypto
 
 }  // namespace content