jimmy wrote:
...
you see, as Nils, pointed out your blob is not in asn.1 der format (not
starting with 0x30..). since ecdsa_sig is BIGNUM *r, *s; you can try
using the BN_bin2bn() function to directly convert your blob to BIGNUM.
you'll need to do this twice, once for r & once for s. Since Nils told
that the 2 numbers were concat'ed & since most of the time they're the
same size, you can take one half of the buffer to be r & the other half
to be s.
r and s are always of the same size (if necessary they are padded
with 0 bytes) as otherwise this couldn't work.
Nils
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