On 02/14/2013 08:46 AM, Niels Möller wrote: > Nikos Mavrogiannopoulos <[email protected]> writes: > >> About the naming you use ecdsa_private_key and public_key. Note that >> this is the same key for static ECDH, and I think MQV. > Do you have any suggestions for improved naming? I understand ECDH, > although it has been a very low priority for me so far, but I'm not > familiar with MQV. Would it be better with more algorithm-neutral names, > like "ecc_point" and "ecc_scalar"?
> The way I think about it, the ecdsa_public key is a combination of a > point and a curve-specification. If I add a highlevel "ecc_point" type, > should that include a pointer to the curve or not? Any of those would be fine (I prefer point as more intuitive). Having a pointer to the curve is a good thing I believe (a point on that curve). I don't think there are cases where a point can be used in multiple curves. It should be easy to generate those structures from x,y pairs and knowledge of the curve. > void > ecdsa_private_key_mul (const struct ecdsa_private_key *key, > mpz_t new_x, mpz_t new_y, const mpz_t x, const mpz_t y); > > (these are not very good names, but I hope you get the idea). At least, > if we think about ECDH as using a temporary keypair, then I think it's > clearest to view the above operation as an operation using out private > key, not as an operation involving the other party's public key. Also a function that checks whether a point lies on a curve would be needed (may already be there, didn't check). > At least, fips-186-3 is not very specific, I think it allows any any > "approved" hash function with security level high enough for the > application. Or even any combination of approved curve and approved hash > function where *both* have high enough security level for the > application. Then you may allow hashing directly the output of the hash and not bother with that. regards, Nikos _______________________________________________ nettle-bugs mailing list [email protected] http://lists.lysator.liu.se/mailman/listinfo/nettle-bugs
