Re: Cipher block questions

[jonathan.thieuleux@gmail.com]

On Tue, Apr 21, 2015 at 10:07:47AM +0200, Milan Broz wrote:


> First, from the cryptsetup log
>   # Userspace crypto wrapper cannot use gost-xts-plain64 (-2).
> it seems that there is some problem with loading of your gost cipher implementation.
>
I relaunch the command into QEMU and I obtain "Userspace crypto wrapper cannot use
gost-xts-plain64 (-95)", and when I try with an algorithm which work fine I have the same
result "Userspace crypto wrapper cannot use aes-xts-plain64 (-95)". So, I don't
know what's the problem or where it came from. I quickly Googled the problem, but nothing.

> What key size you are using in cryptsetup (default is probably 256bit)?

Yes, the key size is 256-bit.

> LRW and XTS modes requires *two* keys in fact (tweaking+encryption).
>
> GOST should use 256bit key, so if you add --key-size 512 to your cryptsetup command
> does it help?

I already tried it, but that doesn't change anything.

--
Jonathan "Coldshell" Thieuleux
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