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[encrypted-media] Clear Key should not use "A128KW" as the JWK "alg"

From: ddorwin via GitHub <sysbot+gh@w3.org>
Date: Fri, 10 Apr 2015 23:19:48 +0000
To: public-html-media@w3.org
Message-ID: <issues.opened-67701713-1428707987-sysbot+gh@w3.org>
ddorwin has just created a new issue for 

== Clear Key should not use "A128KW" as the JWK "alg" ==
Clear Key's License Format specifies JWK with an "alg" (algorithm) 
value of "A128KW".

The JSON Web Algorithms (JWA) registry [describes] 
 "A128KW"  as "AES Key Wrap using 128 bit key." However, Clear Key 
does not use key wrapping, so this is an incorrect description of the 

According to the JWK specification of the ["alg" 
> The values used  should either be registered in the
   IANA JSON Web Signature and Encryption Algorithms registry defined 
   [JWA] or be a value that contains a Collision-Resistant Name....
 Use of this member is OPTIONAL.

Rather than attempting to register "A128" or using some ugly 
Collision-Resistant Name, we should just drop "alg" from the 
specification. The implementation will use the key as specified by the
 container anyway.

See https://github.com/w3c/encrypted-media/issues/48
Received on Friday, 10 April 2015 23:19:49 UTC

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