Am Montag, 27. April 2015, 16:29:35 schrieb Herbert Xu:
Hi Herbert,
>On Sun, Apr 26, 2015 at 12:08:20AM +0200, Stephan Mueller wrote:
>> This patch implements the AES key wrapping as specified in
>> NIST SP800-38F and RFC3394.
>
>This is my attempt at turning kw into a givcipher. The encrypt
>part is complete but untested as I gave up after finding the
>reverse SG problem with your decrypt code.
Is it that easy? I was struggling to understand what to do in the alloc
function.
Thank you very much for that hint.
>static int crypto_kw_givdecrypt(struct skcipher_givcrypt_request *req)
>{
> int err = crypto_kw_decrypt(&req->creq);
>
> if (err)
> return err;
>
> return memcmp(req->creq.info, "\xA6\xA6\xA6\xA6\xA6\xA6\xA6\xA6",
> SEMIBSIZE) ? -EBADMSG : 0;
This memcmp implies that the final block->A from the decrypt is memcpy'ed to
req->creq.info. I wanted to avoid any additional memcpy calls to not hurt
performance even more.
Ciao
Stephan
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