OpenSSL::PKey::EC#dsa_verify_asn1

static VALUE ossl_ec_key_dsa_verify_asn1(VALUE self, VALUE data, VALUE sig)
{
    EC_KEY *ec;

    GetEC(self, ec);
    StringValue(data);
    StringValue(sig);

    switch (ECDSA_verify(0, (unsigned char *)RSTRING_PTR(data), RSTRING_LENINT(data),
                         (unsigned char *)RSTRING_PTR(sig), RSTRING_LENINT(sig), ec)) {
      case 1:
        return Qtrue;
      case 0:
        return Qfalse;
      default:
        ossl_raise(eECError, "ECDSA_verify");
    }
}