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

content/renderer/webcrypto/webcrypto_util.cc

Index: content/renderer/webcrypto/webcrypto_util.cc
diff --git a/content/renderer/webcrypto/webcrypto_util.cc b/content/renderer/webcrypto/webcrypto_util.cc
index 3124afa7dfdf2594f575ba43149d29a155896d17..0046e8f116255bc8bdadae8968772fabe9036eac 100644
--- a/content/renderer/webcrypto/webcrypto_util.cc
+++ b/content/renderer/webcrypto/webcrypto_util.cc
@@ -115,6 +115,10 @@ 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");
 }
@@ -128,6 +132,10 @@ Status Status::ErrorInvalidAesGcmTagLength() {
                 "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");
 }