[webcrypto] Add length parameter to HmacKeyAlgorithm. (chromium)

content/child/webcrypto/webcrypto_util.cc

Index: content/child/webcrypto/webcrypto_util.cc
diff --git a/content/child/webcrypto/webcrypto_util.cc b/content/child/webcrypto/webcrypto_util.cc
index 5e5fc8e4c3d2b7857e438bdb0c32e5af6f59f2f0..2b11ac1df1939f3c6720fbb0a6585b4c79f9d228 100644
--- a/content/child/webcrypto/webcrypto_util.cc
+++ b/content/child/webcrypto/webcrypto_util.cc
@@ -385,7 +385,12 @@ bool CreateSecretKeyAlgorithm(const blink::WebCryptoAlgorithm& algorithm,
       if (hash.isNull())
         return false;
       *key_algorithm = blink::WebCryptoKeyAlgorithm::adoptParamsAndCreate(
-          algorithm.id(), new blink::WebCryptoHmacKeyAlgorithmParams(hash));
+          algorithm.id(),
+#if defined(WEBCRYPTO_HMAC_KEY_HAS_LENGTH)
+          new blink::WebCryptoHmacKeyAlgorithmParams(hash, keylen_bytes * 8));

[eroman, 2014/03/18 23:50:01]

I didn't check for overflow, probably should. wdyt?

[eroman, 2014/03/19 00:04:19]

OK done.

+#else
+          new blink::WebCryptoHmacKeyAlgorithmParams(hash));
+#endif
       return true;
     }
     case blink::WebCryptoAlgorithmIdAesKw: