EC_KEY_METHOD_set_sign
void EC_KEY_METHOD_set_sign(EC_KEY_METHOD *meth,
LCRYPTO_ALIAS(EC_KEY_METHOD_set_sign);
LCRYPTO_USED(EC_KEY_METHOD_set_sign);
EC_KEY_METHOD_set_sign(ecdsa_method, sign, sign_setup,
EC_KEY_METHOD_set_sign(ecdsae_method, sign, sign_setup,