Re: EME support for CENC with AES-CBC?

Are you specifically interested in just CBC or is there something else in
the amendment? (For what it's worth, it does not appear that amendment has
been published.)

The ISO Common Encryption EME Stream Format and Initialization Data
<https://dvcs.w3.org/hg/html-media/raw-file/default/encrypted-media/cenc-format.html#stream-format>
spec
is based on ISO/IEC 23001-7:2012 the AES-128 CTR encryption it specifies.



On Mon, Jun 16, 2014 at 5:20 PM, Jerry Smith (WINDOWS) <
jdsmith@microsoft.com> wrote:

> It would seem that when new encryption types are added to CENC, then these
> will need to be supported by CENC compatible CDMs.  If we agree on that,
> then the current model for IsTypeSupported() should be sufficient.
>
> Jerry
>
> -----Original Message-----
> From: Joe Steele [mailto:steele@adobe.com]
> Sent: Monday, June 16, 2014 1:57 PM
> To: <public-html-media@w3.org>
> Subject: EME support for CENC with AES-CBC?
>
> I am curious whether this group intends to say anything about support for
> the AES-CBC encryption mode for ISOBMFF with CENC. I have been reviewing
> the amendments to the CENC spec, specifically "Part 7: Common encryption
> format for ISO base media file format, AMENDMENT 1: AES-CBC-128 and key
> rotation". I am wondering how CDMs should expect to handle this - or if it
> is called out via isTypeSupported().
>
> This may have been discussed and I just cannot find the references to it.
>
> Joe
>
>