chacha_keysetup
void chacha_keysetup(struct chacha_ctx *x, const u_char *k, u_int kbits)
chacha_keysetup(&ctx->main_ctx, key, 256);
chacha_keysetup(&ctx->header_ctx, key + 32, 256);
chacha_keysetup(&rsx->rs_chacha, buf, KEYSZ * 8);
chacha_keysetup(&rsx->rs_chacha, buf, KEYSZ * 8);
chacha_keysetup(ctx, key, len * 8);
LOCAL void chacha_keysetup(struct chacha_ctx *x, const u_char *k, u_int kbits);
chacha_keysetup(&rng->rng_prf, newkey, sizeof(newkey) * 8);
chacha_keysetup(&rng->rng_prf, newkey, sizeof(newkey) * 8);
chacha_keysetup(&rng->rng_prf, u.hash_out, FX_CHACHA20_KEYSIZE * 8);
chacha_keysetup(&rng->rng_prf, newkey, len * 8);
chacha_keysetup(&context->chacha, data, RANDOM_KEYSIZE * 8);
chacha_keysetup(&kdc->kdc_chacha, key, 256);
chacha_keysetup(&chacha20->ctx, key, CHACHA20_KEYBYTES*8);