I dug into source - it's in DER format so a sleezy hacked function is this: (
I use curve NID_X9_62_prime256v1 )
ECDSA_SIG * sig
BIGNUM * r;
BIGNUM * s;
/* A correct DER-encoded signature has the following form:
0x30: a header byte indicating a compound structure.
A 1-byte length descriptor for all what follows.
0x02: a header byte indicating an integer.
A 1-byte length descriptor for the R value
The R coordinate, as a big-endian integer.
0x02: a header byte indicating an integer.
A 1-byte length descriptor for the S value.
The S coordinate, as a big-endian integer.
*/
r = BN_bin2bn( src+ 4, 32, NULL ); // create new bn here
s = BN_bin2bn( src+ 4 +32 + 2, 32, NULL );
if(!BN_copy(sig->r, r)) goto err;
if(!BN_copy(sig->s, s)) goto err;
--
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