Thank you Victor and Kurt for your quick replies! They were very helpful Best, Andy Schmidt
On Thu, Jan 3, 2019 at 2:00 PM Kurt Roeckx <k...@roeckx.be> wrote: > On Thu, Jan 03, 2019 at 12:18:05PM -0800, Andy Schmidt wrote: > > I am adding the RFC 7919 Diffie-Hellman parameters to our TLS servers, > and > > I've found that these parameters won't pass OpenSSL's Diffie Hellman > > parameter check function DH_check(). The return code is > > DH_NOT_SUITABLE_GENERATOR. Looking at the source code, it appears to fail > > because the remainder of the prime divided by 24 is not 11. That its, p > mod > > 24 != 11. I have a couple of questions: > > > > What relationship between the prime p and the generator g is this > checking > > for? I thought that since p was a safe prime, as long as the generator g > > wasn't 1 the only choice is between the full group and the subgroup of > the > > squares? > > > > I would like to use DH_check() to attempt to ensure that Diffie Hellman > > parameters haven't been tampered on operating systems that don't have > > digital signatures for executable binaries. > > See: > > https://crypto.stackexchange.com/questions/12961/diffie-hellman-parameter-check-when-g-2-must-p-mod-24-11 > > > Kurt > > -- > openssl-users mailing list > To unsubscribe: https://mta.openssl.org/mailman/listinfo/openssl-users >
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