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authorRob Austein <sra@hactrn.net>2017-01-26 00:49:12 -0500
committerRob Austein <sra@hactrn.net>2017-01-26 00:49:12 -0500
commit99407a540c7f1fbbc0987837173d1b81aee790bc (patch)
treef533863a16eca8069df8b939a0af3d509d89109d /rpc_serial.c
parent31ce1c88f745c2946b3c0eb9986e0aaed164485c (diff)
First attempt at using Pavel's ecdsa256 core. Not working yet.
Attempts to use Pavel's ecdsa256 base point multiplier instead of software point multiplier when selecting new random points (that is, when generating P-256 keys or P-256 signatures). Resulting points pass the point validation test (point_is_on_curve()) but the resulting signatures are invalid. Don't know why yet. Seems like an odd combination, as one would expect random garbage to fail validation. In any case: this commit is intended to archive progress so far, and perhaps see if somebody else can spot what's wrong. As presently coded, this wouldn't be suitable for production use even if it worked. NB: As I understand it, the ecdsa256 core is *not* a general purpose point multiplier even just for the P-256 curve. Rather, it is strictly a base point multiplier: it takes a single scalar as input, and returns the X,Y affine coordinates of the curve's base point multiplied by that scalar. This is essentially the eliptic curve portion of the computation involved in picking a random point for key or signature generation, but is not useful for signature validation. See the README.md in Pavel's source repository for further details.
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