[webcrypto] Validate JWK import of AES keys: key length must match algorithm.

content/renderer/webcrypto/webcrypto_util.h

Index: content/renderer/webcrypto/webcrypto_util.h
diff --git a/content/renderer/webcrypto/webcrypto_util.h b/content/renderer/webcrypto/webcrypto_util.h
index 28b4b2c1d61f525c5f1e12cdb4c8ecd19d72d5c8..fc2a9b957efa4782058165ea00a6879e22a62938 100644
--- a/content/renderer/webcrypto/webcrypto_util.h
+++ b/content/renderer/webcrypto/webcrypto_util.h
@@ -83,16 +83,16 @@ class CONTENT_EXPORT Status {
   // specified by the Web Crypto import operation.
   static Status ErrorJwkUsageInconsistent();
 
-  // The "k" parameter was either missing, could not be parsed as a base-64
-  // encoded string, or the decoded bytes were empty.
+  // The "k" parameter was either missing or could not be parsed as a base-64
+  // encoded string.
   static Status ErrorJwkDecodeK();
 
-  // The "n" parameter was either missing, could not be parsed as a base-64
-  // encoded string, or the decoded bytes were empty.
+  // The "n" parameter was either missing or could not be parsed as a base-64
+  // encoded string.
   static Status ErrorJwkDecodeN();
 
-  // The "e" parameter was either missing, could not be parsed as a base-64
-  // encoded string, or the decoded bytes were empty.
+  // The "e" parameter was either missing or could not be parsed as a base-64
+  // encoded string.
   static Status ErrorJwkDecodeE();
 
   // TODO(eroman): Private key import through JWK is not yet supported.
@@ -102,6 +102,12 @@ class CONTENT_EXPORT Status {
   // unrecognized.
   static Status ErrorJwkUnrecognizedKty();
 
+  // The amount of key data provided was incompatible with the selected
+  // algorithm. For instance if the algorith name was A128CBC then EXACTLY
+  // 128-bits of key data must have been provided. If 192-bits of key data were
+  // given that is an error.
+  static Status ErrorJwkIncorrectKeyLength();
+
   // ------------------------------------
   // Other errors
   // ------------------------------------