crypto_rng_alg
crypto_rng_alg(pctx->drng)->set_ent(pctx->drng, kentropy, len);
err = crypto_rng_alg(tfm)->seed(tfm, seed, slen);
struct rng_alg *alg = crypto_rng_alg(tfm);
struct rng_alg *alg = crypto_rng_alg(tfm);
crypto_rng_alg(tfm)->set_ent(tfm, data, len);
return crypto_rng_alg(tfm)->generate(tfm, src, slen, dst, dlen);
return crypto_rng_alg(tfm)->seedsize;