ECDSA_do_verify
ret = ECDSA_do_verify(dgst, dgst_len, s, eckey);
int ECDSA_do_verify(const unsigned char *dgst, int dgst_len,
switch (ECDSA_do_verify(sighash, sizeof(sighash), esig, key->ecdsa)) {
switch (ECDSA_do_verify(digest, hlen, esig, key->ecdsa)) {