ossl_sm4_decrypt
dat->block = (block128_f)ossl_sm4_decrypt;
void ossl_sm4_decrypt(const uint8_t *in, uint8_t *out, const SM4_KEY *ks);
ctx->block = (block128_f)ossl_sm4_decrypt;
ossl_sm4_decrypt, stream, stream_gb);
ossl_sm4_decrypt(block, block, &key);