crypto_stdrng_get_bytes
err = crypto_stdrng_get_bytes(key, oversampling_size);
err = crypto_stdrng_get_bytes(private_key, nbytes);
err = crypto_stdrng_get_bytes(ctx->salt, crypto_aead_ivsize(aead));
ret = crypto_stdrng_get_bytes(params->key, params->key_size);
rc = crypto_stdrng_get_bytes(sca, nbytes);
rc = crypto_stdrng_get_bytes(priv, nbytes);
return crypto_stdrng_get_bytes(skey->key, skey->keylen);