[webcrypto] Add raw symmetric key AES-KW wrap/unwrap for NSS.

content/renderer/webcrypto/webcrypto_util.cc

 // Copyright 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.
 
 #include "content/renderer/webcrypto/webcrypto_util.h"
 
 #include "base/base64.h"
 #include "base/logging.h"
 #include "third_party/WebKit/public/platform/WebCryptoAlgorithm.h"
 #include "third_party/WebKit/public/platform/WebCryptoAlgorithmParams.h"
@@ skipping 97 matching lines @@
 }
 
 Status Status::ErrorIncorrectSizeAesCbcIv() {
   return Status("The \"iv\" has an unexpected length -- must be 16 bytes");
 }
 
 Status Status::ErrorDataTooLarge() {
   return Status("The provided data is too large");
 }
 
+Status Status::ErrorDataTooSmall() {
+  return Status("The provided data is too small");
+}
+
 Status Status::ErrorUnsupported() {
   return Status("The requested operation is unsupported");
 }
 
 Status Status::ErrorUnexpected() {
   return Status("Something unexpected happened...");
 }
 
 Status Status::ErrorInvalidAesGcmTagLength() {
   return Status("The tag length is invalid: either too large or not a multiple "
                 "of 8 bits");
 }
 
+Status Status::ErrorInvalidAesKwDataLength() {
+  return Status("The data length is invalid: not a multiple of 8 bytes");

[eroman, 2014/02/26 23:40:22]

I suggest adding AES-KW somewhere in there

(The way these errors are displayed is less than ideal: they show up in the
devtools console. So the more specific the better)

[padolph, 2014/02/28 23:28:40]

Done.

+}
+
 Status Status::ErrorGenerateKeyPublicExponent() {
   return Status("The \"publicExponent\" is either empty, zero, or too large");
 }
 
 Status Status::ErrorMissingAlgorithmImportRawKey() {
   return Status("The key's algorithm must be specified when importing "
                 "raw-formatted key.");
 }
 
 Status Status::ErrorImportRsaEmptyModulus() {
@@ skipping 181 matching lines @@
       return 128;
     default:
       NOTREACHED();
       return 0;
   }
 }
 
 }  // namespace webcrypto
 
 }  // namespace content