On 14 December 2012 20:39, Matt Caswell (fr...@baggins.org) <fr...@baggins.org> wrote: > On 14 December 2012 15:02, jeetendra gangele <gangele...@gmail.com> wrote: >> >> On 14 December 2012 20:18, Matt Caswell (fr...@baggins.org) >> <fr...@baggins.org> wrote: >> > >> > >> > On 14 December 2012 14:20, jeetendra gangele <gangele...@gmail.com> >> > wrote: >> >> >> >> it looks very odd loading of public key during sign operation. >> >> Ok tell me one thing I can load any valid point on the curve during >> >> sign. >> > >> > >> > An ECDSA sign operates on the curve and associated parameters, the >> > private >> > key, and the message, and outputs two values (which are just numbers) r >> > and >> > s. No points on the curve are provided as input or received as output >> > (although they are used internally). >> > >> > What I have recommended to you is that you fill in both the private and >> > public key in the EC_KEY object so that an EC_KEY_check_key call passes. >> > This is not loading "any valid point on the curve"...it must be the >> > public >> > key for the associated private key, or EC_KEY_check_key will not pass. >> > As I >> > said in one of my first emails, it is straight forward to find the >> > public >> > key given the private key. >> > >> Here I wont agree because suppose if I loaded all the curve parameters >> and try to load public key which wont lie on the curve,Its failing. > > > As previously mentioned the code to find a public key given a private key > looks like this: > > > if (!EC_POINT_mul(group, pub_key, pkey, NULL, NULL, ctx)) > goto err; > > All you need is the curve and the private key and in one line you can get > the public key.
Yes i did same thanks for all ur support. Is there any relation between curve parameter and private key or private key can be any random number? As far I remeber there is relation and it depend upon discrete math problem that is unsolved as of now. so once that problem got resolved private key can be broken. am i correct? > > Matt > ______________________________________________________________________ OpenSSL Project http://www.openssl.org User Support Mailing List openssl-users@openssl.org Automated List Manager majord...@openssl.org
