On 3/7/2015 3:16 AM, Kim Phillips wrote: > On Fri, 6 Mar 2015 11:49:43 -0500 > Martin Hicks <mort@xxxxxxxx> wrote: > >> On Thu, Mar 5, 2015 at 7:16 PM, Kim Phillips <kim.phillips@xxxxxxxxxxxxx> wrote: >>> On Fri, 20 Feb 2015 12:00:10 -0500 >>> Martin Hicks <mort@xxxxxxxx> wrote: >>> >>>> The newer talitos hardware has support for AES in XTS mode. >>> >>> Assuming it's the same thing, AES-XCBC gets added with SEC v3.0 >>> h/w. Assuming hw_supports() doesn't already support this algorithm >> >> AES-XCBC isn't the same thing as AES-XTS. > > Thanks. > >>> combination (technically via the mode bit), this needs to be >>> reflected in the patch so the driver doesn't think SEC 2.x devices >>> can do XTS, too. >> >> Right. I hadn't looked into how exactly hw_supports() works. It only >> indicates which execution units are present (in this case the AES >> unit). I actually think XTS gets introduced in SEC v3.3.2. I also >> have an MPC8379 (sec3.3) and it does not have XTS. >> >> Can you look internally to find out in which hardware it was >> introduced? Is there a SEC 3.3.1 that also has XTS? > > later MPC8315Es had a SEC v3.3.1, but AFAICT, it doesn't support > XTS, so, yes, it's likely v3.3.2 and above (if any). There's a public application note on freescale.com: "AN3645 - SEC 2x/3x Descriptor Programmer's Guide" (Rev.3/2010) "Table 4 - EUs Supported in Each SEC Version" summarizes which algorithms / modes are supported for every talitos version. Unfortunately this goes up to SEC 3.3.1. Since XTS doesn't show up, 3.3.2 would be the first supporting it. Horia -- To unsubscribe from this list: send the line "unsubscribe linux-crypto" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
