crypto_rng_generate
genlen = crypto_rng_generate(drng, addtl, addtl_len, result, len);
ret = crypto_rng_generate(drng, test->addtla, test->addtllen,
ret = crypto_rng_generate(drng, test->addtlb, test->addtllen,
return crypto_rng_generate(tfm, NULL, 0, rdata, dlen);