Nope, we don't have a public API for modular inverse. Alex
On Fri, Dec 1, 2017 at 5:38 PM, John Pacific <m...@johnpacific.com> wrote: > Hey, Alex! > > Thanks for the response! I've been using the ECDH API for the scalar > multiplication, but my last remaining need is for `BN_mod_inverse` and I > can't seem to find anything on that quite yet. No pointers here, I guess? > > > Thanks! > > -John > > On Fri, Dec 1, 2017 at 3:24 PM, Alex Gaynor <alex.gay...@gmail.com> wrote: > >> Hi John, >> >> We don't have an API for doing raw EC point arithmetic. >> https://github.com/pyca/cryptography/pull/2919 is an issue proposing >> (and implementing) it, but I've been very hesitant to expand the API like >> this. >> >> Point multiplication can be accomplished with the ECDH API. >> >> Alex >> >> On Fri, Dec 1, 2017 at 2:47 PM, John Pacific <m...@johnpacific.com> wrote: >> >>> Hey, folks! >>> >>> I'm working on prototyping this cryptosystem using cryptography. I'm >>> porting it from Charm-crypto in Python to this. >>> >>> Charm crypto overrides some operators to perform scalar multiplication >>> and modular inverses -- ie: `*` and `~`. When these operators are used with >>> an EC element, it performs the overriden operation. >>> >>> I am now in the need to perform some similar operations within the >>> context of cryptography.io and I can't seem to find a great way to do >>> this. >>> >>> I can access some OpenSSL functions like `EC_POINT_mul` and >>> `BN_mod_inverse` via `default_backend()._lib.EC_POINT_mul`, etc but I >>> can't find any documentation of how this is used within the context of >>> cryptography.io. >>> >>> Do any of you wonderful folks have any pointers on this or maybe how to >>> perform some point arithmetic with the cryptography objects? >>> >>> >>> Thanks, >>> >>> tux >>> >>> _______________________________________________ >>> Cryptography-dev mailing list >>> Cryptography-dev@python.org >>> https://mail.python.org/mailman/listinfo/cryptography-dev >>> >>> >> >> >> -- >> "I disapprove of what you say, but I will defend to the death your right >> to say it." -- Evelyn Beatrice Hall (summarizing Voltaire) >> "The people's good is the highest law." -- Cicero >> GPG Key fingerprint: D1B3 ADC0 E023 8CA6 >> >> >> _______________________________________________ >> Cryptography-dev mailing list >> Cryptography-dev@python.org >> https://mail.python.org/mailman/listinfo/cryptography-dev >> >> > > _______________________________________________ > Cryptography-dev mailing list > Cryptography-dev@python.org > https://mail.python.org/mailman/listinfo/cryptography-dev > > -- "I disapprove of what you say, but I will defend to the death your right to say it." -- Evelyn Beatrice Hall (summarizing Voltaire) "The people's good is the highest law." -- Cicero GPG Key fingerprint: D1B3 ADC0 E023 8CA6
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