On Sun, Jul 30, 2017 at 02:32:58PM +0200, Stephan Müller wrote: > Use the NULL cipher to copy the AAD and PT/CT from the TX SGL > to the RX SGL. This allows an in-place crypto operation on the > RX SGL for encryption, because the TX data is always smaller or > equal to the RX data (the RX data will hold the tag). > > For decryption, a per-request TX SGL is created which will only hold > the tag value. As the RX SGL will have no space for the tag value and > an in-place operation will not write the tag buffer, the TX SGL with the > tag value is chained to the RX SGL. This now allows an in-place > crypto operation. > > For example: > > * without the patch: > kcapi -x 2 -e -c "gcm(aes)" -p 89154d0d4129d322e4487bafaa4f6b46 -k c0ece3e63198af382b5603331cc23fa8 -i 7e489b83622e7228314d878d -a afcd7202d621e06ca53b70c2bdff7fb2 -l 16 -u -s > 00000000000000000000000000000000f4a3eacfbdadd3b1a17117b1d67ffc1f1e21efbbc6d83724a8c296e3bb8cda0c > > * with the patch: > kcapi -x 2 -e -c "gcm(aes)" -p 89154d0d4129d322e4487bafaa4f6b46 -k c0ece3e63198af382b5603331cc23fa8 -i 7e489b83622e7228314d878d -a afcd7202d621e06ca53b70c2bdff7fb2 -l 16 -u -s > afcd7202d621e06ca53b70c2bdff7fb2f4a3eacfbdadd3b1a17117b1d67ffc1f1e21efbbc6d83724a8c296e3bb8cda0c > > Tests covering this functionality have been added to libkcapi. > > Signed-off-by: Stephan Mueller <smueller@xxxxxxxxxx> Patch applied. Thanks. -- Email: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx> Home Page: http://gondor.apana.org.au/~herbert/ PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
