1// Copyright 2016 The Go Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style
3// license that can be found in the LICENSE file.
4
5package chacha20
6
7import (
8	"encoding/hex"
9	"testing"
10)
11
12func TestCore(t *testing.T) {
13	// This is just a smoke test that checks the example from
14	// https://tools.ietf.org/html/rfc7539#section-2.3.2. The
15	// chacha20poly1305 package contains much more extensive tests of this
16	// code.
17	var key [32]byte
18	for i := range key {
19		key[i] = byte(i)
20	}
21
22	var input [16]byte
23	input[0] = 1
24	input[7] = 9
25	input[11] = 0x4a
26
27	var out [64]byte
28	XORKeyStream(out[:], out[:], &input, &key)
29	const expected = "10f1e7e4d13b5915500fdd1fa32071c4c7d1f4c733c068030422aa9ac3d46c4ed2826446079faa0914c2d705d98b02a2b5129cd1de164eb9cbd083e8a2503c4e"
30	if result := hex.EncodeToString(out[:]); result != expected {
31		t.Errorf("wanted %x but got %x", expected, result)
32	}
33}
34