shake256
void shake256(const u8 *in, size_t in_len, u8 *out, size_t out_len);
shake256(pk, pk_len, ws->tr, sizeof(ws->tr));
EXPORT_SYMBOL_GPL(shake256);
shake256(test_sha3_sample, sizeof(test_sha3_sample) - 1,
shake256("", 0, out, sizeof(out));
shake256(test_nist_1600_sample, sizeof(test_nist_1600_sample),
shake256(in, in_len, out, out_len);