this parameter is ignored
pointer to the hash value to sign
length of the hash value
buffer to hold the DER encoded signature
pointer to the length of the returned signature
BIGNUM with a pre-computed inverse k (optional)
BIGNUM with a pre-computed rp value (optioanl), see ECDSA_sign_setup
EC_KEY object containing a private EC key
1 on success and 0 otherwise
Computes ECDSA signature of a given hash value using the supplied private key (note: sig must point to ECDSA_size(eckey) bytes of memory).