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ratchet_test.go
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ratchet_test.go
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// Copyright (c) 2013 Adam Langley. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name Pond nor the names of its contributors may be
// used to endorse or promote products derived from this software without
// specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
package goax
import (
"bytes"
"crypto/rand"
"encoding/json"
"io"
"testing"
)
func pairedRatchet() (a, b *Ratchet) {
var privA, privB [32]byte
io.ReadFull(rand.Reader, privA[:])
io.ReadFull(rand.Reader, privB[:])
a, b = New(privA[:]), New(privB[:])
kxA, err := a.GetKeyExchangeMaterial()
if err != nil {
panic(err)
}
kxB, err := b.GetKeyExchangeMaterial()
if err != nil {
panic(err)
}
if err := a.CompleteKeyExchange(kxB); err != nil {
panic(err)
}
if err := b.CompleteKeyExchange(kxA); err != nil {
panic(err)
}
return
}
func TestExchange(t *testing.T) {
a, b := pairedRatchet()
msg := []byte("test message")
encrypted := a.Encrypt(msg)
result, err := b.Decrypt(encrypted)
if err != nil {
t.Fatal(err)
}
if !bytes.Equal(msg, result) {
t.Fatalf("result doesn't match: %x vs %x", msg, result)
}
}
type scriptAction struct {
// object is one of sendA, sendB or sendDelayed. The first two options
// cause a message to be sent from one party to the other. The latter
// causes a previously delayed message, identified by id, to be
// delivered.
object int
// result is one of deliver, drop or delay. If delay, then the message
// is stored using the value in id. This value can be repeated later
// with a sendDelayed.
result int
id int
}
const (
sendA = iota
sendB
sendDelayed
deliver
drop
delay
)
func testScript(t *testing.T, script []scriptAction) {
type delayedMessage struct {
msg []byte
encrypted []byte
fromA bool
}
delayedMessages := make(map[int]delayedMessage)
a, b := pairedRatchet()
for i, action := range script {
switch action.object {
case sendA, sendB:
sender, receiver := a, b
if action.object == sendB {
sender, receiver = receiver, sender
}
var msg [20]byte
rand.Reader.Read(msg[:])
encrypted := sender.Encrypt(msg[:])
switch action.result {
case deliver:
result, err := receiver.Decrypt(encrypted)
if err != nil {
t.Fatalf("#%d: receiver returned error: %s", i, err)
}
if !bytes.Equal(result, msg[:]) {
t.Fatalf("#%d: bad message: got %x, not %x", i, result, msg[:])
}
case delay:
if _, ok := delayedMessages[action.id]; ok {
t.Fatalf("#%d: already have delayed message with id %d", i, action.id)
}
delayedMessages[action.id] = delayedMessage{msg[:], encrypted, sender == a}
case drop:
}
case sendDelayed:
delayed, ok := delayedMessages[action.id]
if !ok {
t.Fatalf("#%d: no such delayed message id: %d", i, action.id)
}
receiver := a
if delayed.fromA {
receiver = b
}
result, err := receiver.Decrypt(delayed.encrypted)
if err != nil {
t.Fatalf("#%d: receiver returned error: %s", i, err)
}
if !bytes.Equal(result, delayed.msg) {
t.Fatalf("#%d: bad message: got %x, not %x", i, result, delayed.msg)
}
}
}
}
func TestBackAndForth(t *testing.T) {
testScript(t, []scriptAction{
{sendA, deliver, -1},
{sendB, deliver, -1},
{sendA, deliver, -1},
{sendB, deliver, -1},
{sendA, deliver, -1},
{sendB, deliver, -1},
})
}
func TestReorder(t *testing.T) {
testScript(t, []scriptAction{
{sendA, deliver, -1},
{sendA, delay, 0},
{sendA, deliver, -1},
{sendDelayed, deliver, 0},
})
}
func TestReorderAfterRatchet(t *testing.T) {
testScript(t, []scriptAction{
{sendA, deliver, -1},
{sendA, delay, 0},
{sendB, deliver, -1},
{sendA, deliver, -1},
{sendB, deliver, -1},
{sendDelayed, deliver, 0},
})
}
func TestDrop(t *testing.T) {
testScript(t, []scriptAction{
{sendA, drop, -1},
{sendA, drop, -1},
{sendA, drop, -1},
{sendA, drop, -1},
{sendA, deliver, -1},
{sendB, deliver, -1},
})
}
func TestMarshal(t *testing.T) {
var priv [32]byte
io.ReadFull(rand.Reader, priv[:])
ratchet := New(priv[:])
kx, err := ratchet.GetKeyExchangeMaterial()
if err != nil {
t.Fatal(err)
}
marshalled, err := json.Marshal(kx)
if err != nil {
t.Fatal(err)
}
var kxActual KeyExchange
err = json.Unmarshal(marshalled, &kxActual)
if err != nil {
t.Fatal(err)
}
if !bytes.Equal(kxActual.Dh[:], kx.Dh[:]) {
t.Fatalf("Dh doesn't match; expected %x, got %x\n", kx.Dh, kxActual.Dh)
}
if !bytes.Equal(kxActual.Dh1[:], kx.Dh1[:]) {
t.Fatalf("Dh1 doesn't match; expected %x, got %x\n", kx.Dh1, kxActual.Dh1)
}
if !bytes.Equal(kxActual.IdentityPublic[:], kx.IdentityPublic[:]) {
t.Fatalf("IdentityPublic doesn't match; expected %x, got %x\n", kx.IdentityPublic, kxActual.IdentityPublic)
}
}