HWSM4_set_decrypt_key
HWSM4_set_decrypt_key(key, &dat->ks.ks);
int HWSM4_set_decrypt_key(const unsigned char *userKey, SM4_KEY *key);
HWSM4_set_decrypt_key(key, ks);
XTS_SET_KEY_FN(HWSM4_set_encrypt_key, HWSM4_set_decrypt_key,