Re: Verify signature (ECDSA_do_verify) using only x-coordinate in public key (EC_POINT)?

2013-09-06 Thread Jonas Andersson
Hi, Thanks for your response. I'm sure that I only have the x-coordinate and when I reed up on ecc, it seems to be possible to verify the signature by only using this x-coordinate. Is there a way to do this with OpenSSL? Br, Jonas 2013/9/3 Matt Caswell fr...@baggins.org On 3 September 2013

Re: Verify signature (ECDSA_do_verify) using only x-coordinate in public key (EC_POINT)?

2013-09-06 Thread Matt Caswell
On 6 September 2013 07:22, Jonas Andersson jonasanderssonm...@gmail.com wrote: Hi, Thanks for your response. I'm sure that I only have the x-coordinate and when I reed up on ecc, it seems to be possible to verify the signature by only using this x-coordinate. Is there a way to do this with

Re: Verify signature (ECDSA_do_verify) using only x-coordinate in public key (EC_POINT)?

2013-09-03 Thread Matt Caswell
On 3 September 2013 15:16, Jonas Andersson jonasanderssonm...@gmail.com wrote: Hi all, Is there a way to verify a signature with ECDSA_do_verify having only the x-coordinate (in public key) available? Are you sure you *only* have the x-coord and not a point in compressed format? The