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. > and whn I verify the signed message i should be able to verify with > the other valid public key? > When verifying you will be able to verify with the public key that corresponds to the private key used originally to sign the message. Matt
