chacha20poly1305/internal/chacha20/chacha_test.go

// Copyright 2016 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package chacha20

import (
	"encoding/hex"
	"testing"
)

func TestCore(t *testing.T) {
	// This is just a smoke test that checks the example from
	// https://tools.ietf.org/html/rfc7539#section-2.3.2. The
	// chacha20poly1305 package contains much more extensive tests of this
	// code.
	var key [32]byte
	for i := range key {
		key[i] = byte(i)
	}

	var input [16]byte
	input[0] = 1
	input[7] = 9
	input[11] = 0x4a

	var out [64]byte
	XORKeyStream(out[:], out[:], &input, &key)
	const expected = "10f1e7e4d13b5915500fdd1fa32071c4c7d1f4c733c068030422aa9ac3d46c4ed2826446079faa0914c2d705d98b02a2b5129cd1de164eb9cbd083e8a2503c4e"
	if result := hex.EncodeToString(out[:]); result != expected {
		t.Errorf("wanted %x but got %x", expected, result)
	}
}