| Subject | Re: [PATCH 16/18] crypto: dh - calculate Q from P for the full public key verification | From | Hannes Reinecke <> | Date | Wed, 1 Dec 2021 08:33:28 +0100 |
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On 12/1/21 1:48 AM, Nicolai Stange wrote: > As the ->q in struct dh_ctx gets never set anywhere, the code > in dh_is_pubkey_valid() for doing the full public key validation in > accordance to SP800-56Arev3 is effectively dead. > > However, for safe-prime groups, Q = (P - 1)/2 by definition and this > enables dh_is_pubkey_valid() to calculate Q on the fly for these groups. > Implement this. > > With this change, the last code accessing struct dh_ctx's ->q is now gone. > Remove this member from struct dh_ctx. > > Signed-off-by: Nicolai Stange <nstange@suse.de> > --- > crypto/dh.c | 40 +++++++++++++++++++++++++++++----------- > 1 file changed, 29 insertions(+), 11 deletions(-) > Reviewed-by: Hannes Reinecke <hare@suse.de>
Cheers,
Hannes -- Dr. Hannes Reinecke Kernel Storage Architect hare@suse.de +49 911 74053 688 SUSE Software Solutions GmbH, Maxfeldstr. 5, 90409 Nürnberg HRB 36809 (AG Nürnberg), Geschäftsführer: Felix Imendörffer
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