> -----Original Message----- > From: linux-crypto-ow...@vger.kernel.org <linux-crypto-ow...@vger.kernel.org> > On Behalf Of > Corentin Labbe > Sent: Thursday, August 1, 2019 9:43 PM > To: herb...@gondor.apana.org.au; linux-crypto@vger.kernel.org > Cc: linux-ker...@vger.kernel.org > 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? > Thanks > Regards Regards, Pascal van Leeuwen Silicon IP Architect, Multi-Protocol Engines @ Verimatrix www.insidesecure.com
