On Fri, Aug 02, 2019 at 12:24:04AM +0000, Pascal Van Leeuwen wrote: > > -----Original Message----- > > From: linux-crypto-owner@xxxxxxxxxxxxxxx <linux-crypto-owner@xxxxxxxxxxxxxxx> On Behalf Of > > Corentin Labbe > > Sent: Thursday, August 1, 2019 9:43 PM > > To: herbert@xxxxxxxxxxxxxxxxxxx; linux-crypto@xxxxxxxxxxxxxxx > > Cc: linux-kernel@xxxxxxxxxxxxxxx > > Subject: Need help with failling gcm_base(ctr,ghash-generic) selftest > > > > Hello > > > > I am writing the Allwinner sun8i-ce driver and when running tcrypt I got > > [ 30.201739] alg: aead: gcm_base(ctr-aes-sun8i-ce,ghash-generic) decryption failed on test > > vector 3; expected_error=0, actual_error=-74, cfg=\"random: may_sleep use_digest > > src_divs=[100.0%@+2614] dst_divs=[5.90%@alignmask+3015, 60.56%@+3996, 17.92%@+865, > > 15.62%@+10]\" > > or > > > The decryption reports only an -EBADMSG here, which means the decryption itself went > fine, but the authentication tag mismatched. > > > > [ 148.613537] alg: aead: gcm_base(ctr-aes-sun8i-ce,ghash-generic) encryption test failed > > (wrong result) on test vector 2, cfg=\"random: may_sleep use_final src_divs=[100.0%@+0] > > iv_offset=20\" > > > Can't say for sure, but considering the decrypt error, this is most likely just a > mismatch on the appended authentication tag. > > > Since ctr-aes-sun8i-ce is passing the ctr(aes) selftest, I dont understand what could be > > wrong. > > > That is possible, as this appears to be a problem with the authentication part, > not the encryption part. So possibly a problem with the way you setup the > authentication key (which is actually derived from the encryption key, but I don't > know if your hardware does this autonomously, mine doesn't) and/or operation? > But since my driver is just a skcipher, I dont understand why I should care about any aead part, right ?
