On Thursday, 26 February 2015 17:33:14 UTC+1, Jean-Pierre Münch wrote:
>
> Hey Brendan,
>
> yes, I do think it's possible if the curves are the only critical point.
> I do furthermore think that some of the listed curves are already shipped
> with Crypto++.
>
> OK, thanks for the info. When you say this is the only critical point are
you perhaps referring to the hash algorithm used or some other factor?
At the moment, all I have is the public key. I can use OpenSSL to dump the
output of the public key and can convert it to DER format in Crypto++ and
what I pass it through dumpasn1 it matches.
Following your links what values should I be using for the point Q when
both octet string for the public key and the generator are compressed
(prefixed with 02 in ASN1 output) ?
eg (I'm not entirely comfortable posting the key in a public forum so I
have obfuscated some of the detail here):
Thanks again
Private-Key: (113 bit)
pub: 02:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx
Field Type: prime-field
Prime: 00:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx
A: 0
B: 3 (0x3)
Generator (compressed):
02:00:00:00:00:00:00:00:00:00:00:00:00:00:01
Order:
01:00:00:00:00:00:00:xx:xx:xx:xx:xx:xx:xx:xx
Cofactor: 1 (0x1)
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