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// Copyright (c) 2016 Andreas Auernhammer. All rights reserved.
// Use of this source code is governed by a license that can be
// found in the LICENSE file.
package serpent
import (
"bytes"
"crypto/cipher"
"encoding/hex"
"testing"
)
var recoverFail = func(t *testing.T) {
if err := recover(); err == nil {
t.Fatal("Recover expected error, but no one occured")
}
}
var badKeys = [][]byte{
make([]byte, 15),
make([]byte, 17),
make([]byte, 23),
make([]byte, 25),
make([]byte, 31),
make([]byte, 33),
}
func TestEncrypt(t *testing.T) {
encFail := func(t *testing.T, c cipher.Block, srcLen, dstLen int) {
defer recoverFail(t)
src := make([]byte, srcLen)
dst := make([]byte, dstLen)
c.Encrypt(dst, src)
}
c, err := NewCipher(make([]byte, 16))
if err != nil {
t.Fatalf("Failed to create serpent cipher: %s", err)
}
encFail(t, c, BlockSize-1, BlockSize)
encFail(t, c, BlockSize, BlockSize-1)
}
func TestDecrypt(t *testing.T) {
decFail := func(t *testing.T, c cipher.Block, srcLen, dstLen int) {
defer recoverFail(t)
src := make([]byte, srcLen)
dst := make([]byte, dstLen)
c.Decrypt(dst, src)
}
c, err := NewCipher(make([]byte, 16))
if err != nil {
t.Fatalf("Failed to create serpent cipher: %s", err)
}
decFail(t, c, BlockSize-1, BlockSize)
decFail(t, c, BlockSize, BlockSize-1)
}
func TestEncryptDecrypt(t *testing.T) {
c, err := NewCipher(make([]byte, 16))
if err != nil {
t.Fatalf("Failed to create serpent cipher: %s", err)
}
src := make([]byte, 32)
dst := make([]byte, 32)
c.Encrypt(dst, src)
c.Encrypt(dst[16:], src[:16])
c.Decrypt(dst, dst)
c.Decrypt(dst[16:], dst[16:])
if !bytes.Equal(src, dst) {
t.Fatalf("En / decryption sequence failed\nFound: %s\nExpected: %s", hex.EncodeToString(dst), hex.EncodeToString(src))
}
}
func TestNewCipher(t *testing.T) {
var (
key128 [16]byte
key192 [24]byte
key256 [32]byte
)
_, err := NewCipher(key128[:])
if err != nil {
t.Fatalf("NewCipher rejected valid key with length: %d", len(key128))
}
_, err = NewCipher(key192[:])
if err != nil {
t.Fatalf("NewCipher rejected valid key with length: %d", len(key192))
}
_, err = NewCipher(key256[:])
if err != nil {
t.Fatalf("NewCipher rejected valid key with length: %d", len(key256))
}
for i, v := range badKeys {
_, err := NewCipher(v)
if err == nil {
t.Fatalf("NewCipher accpeted bad key %d with length: %d", i, len(v))
}
}
}
func TestBlockSize(t *testing.T) {
s := new(subkeys)
if bs := s.BlockSize(); bs != BlockSize {
t.Fatalf("BlockSize() returned unexpected value: %d", bs)
}
}
// Tests the S-Box 0 and its inverse.
func TestSBox0(t *testing.T) {
v0, v1, v2, v3 := uint32(0), uint32(0), uint32(0), uint32(0)
for i := 0; i < 16; i++ {
v0, v1, v2, v3 = v3+v0+uint32(i), v0+v1, v1+v2, v2+v3
i0, i1, i2, i3 := v0, v1, v2, v3
sb0(&v0, &v1, &v2, &v3)
sb0Inv(&v0, &v1, &v2, &v3)
if i0 != v0 || i1 != v1 || i2 != v2 || i3 != v3 {
t.Fatal("Sbox 0 failed")
}
}
}
// Tests the S-Box 1 and its inverse.
func TestSBox1(t *testing.T) {
v0, v1, v2, v3 := uint32(0), uint32(0), uint32(0), uint32(0)
for i := 0; i < 16; i++ {
v0, v1, v2, v3 = v3+v0+uint32(i), v0+v1, v1+v2, v2+v3
i0, i1, i2, i3 := v0, v1, v2, v3
sb1(&v0, &v1, &v2, &v3)
sb1Inv(&v0, &v1, &v2, &v3)
if i0 != v0 || i1 != v1 || i2 != v2 || i3 != v3 {
t.Fatal("sbox 1 failed")
}
}
}
// Tests the S-Box 2 and its inverse.
func TestSBox2(t *testing.T) {
v0, v1, v2, v3 := uint32(0), uint32(0), uint32(0), uint32(0)
for i := 0; i < 16; i++ {
v0, v1, v2, v3 = v3+v0+uint32(i), v0+v1, v1+v2, v2+v3
i0, i1, i2, i3 := v0, v1, v2, v3
sb2(&v0, &v1, &v2, &v3)
sb2Inv(&v0, &v1, &v2, &v3)
if i0 != v0 || i1 != v1 || i2 != v2 || i3 != v3 {
t.Fatal("sbox 2 failed")
}
}
}
// Tests the S-Box 3 and its inverse.
func TestSBox3(t *testing.T) {
v0, v1, v2, v3 := uint32(0), uint32(0), uint32(0), uint32(0)
for i := 0; i < 16; i++ {
v0, v1, v2, v3 = v3+v0+uint32(i), v0+v1, v1+v2, v2+v3
i0, i1, i2, i3 := v0, v1, v2, v3
sb3(&v0, &v1, &v2, &v3)
sb3Inv(&v0, &v1, &v2, &v3)
if i0 != v0 || i1 != v1 || i2 != v2 || i3 != v3 {
t.Fatal("sbox 3 failed")
}
}
}
// Tests the S-Box 4 and its inverse.
func TestSBox4(t *testing.T) {
v0, v1, v2, v3 := uint32(0), uint32(0), uint32(0), uint32(0)
for i := 0; i < 16; i++ {
v0, v1, v2, v3 = v3+v0+uint32(i), v0+v1, v1+v2, v2+v3
i0, i1, i2, i3 := v0, v1, v2, v3
sb4(&v0, &v1, &v2, &v3)
sb4Inv(&v0, &v1, &v2, &v3)
if i0 != v0 || i1 != v1 || i2 != v2 || i3 != v3 {
t.Fatal("sbox 4 failed")
}
}
}
// Tests the S-Box 5 and its inverse.
func TestSBox5(t *testing.T) {
v0, v1, v2, v3 := uint32(0), uint32(0), uint32(0), uint32(0)
for i := 0; i < 16; i++ {
v0, v1, v2, v3 = v3+v0+uint32(i), v0+v1, v1+v2, v2+v3
i0, i1, i2, i3 := v0, v1, v2, v3
sb5(&v0, &v1, &v2, &v3)
sb5Inv(&v0, &v1, &v2, &v3)
if i0 != v0 || i1 != v1 || i2 != v2 || i3 != v3 {
t.Fatal("sbox 5 failed")
}
}
}
// Tests the S-Box 6 and its inverse.
func TestSBox6(t *testing.T) {
v0, v1, v2, v3 := uint32(0), uint32(0), uint32(0), uint32(0)
for i := 0; i < 16; i++ {
v0, v1, v2, v3 = v3+v0+uint32(i), v0+v1, v1+v2, v2+v3
i0, i1, i2, i3 := v0, v1, v2, v3
sb6(&v0, &v1, &v2, &v3)
sb6Inv(&v0, &v1, &v2, &v3)
if i0 != v0 || i1 != v1 || i2 != v2 || i3 != v3 {
t.Fatal("sbox 6 failed")
}
}
}
// Tests the S-Box 7 and its inverse.
func TestSBox7(t *testing.T) {
v0, v1, v2, v3 := uint32(0), uint32(0), uint32(0), uint32(0)
for i := 0; i < 16; i++ {
v0, v1, v2, v3 = v3+v0+uint32(i), v0+v1, v1+v2, v2+v3
i0, i1, i2, i3 := v0, v1, v2, v3
sb7(&v0, &v1, &v2, &v3)
sb7Inv(&v0, &v1, &v2, &v3)
if i0 != v0 || i1 != v1 || i2 != v2 || i3 != v3 {
t.Fatal("sbox 7 failed")
}
}
}
// Tests the linear transformation and its inverse
func TestLinear(t *testing.T) {
v0, v1, v2, v3 := uint32(0), uint32(0), uint32(0), uint32(0)
for i := 0; i < 16; i++ {
v0, v1, v2, v3 = v3+v0+uint32(i), v0+v1, v1+v2, v2+v3
i0, i1, i2, i3 := v0, v1, v2, v3
linear(&v0, &v1, &v2, &v3)
linearInv(&v0, &v1, &v2, &v3)
if i0 != v0 || i1 != v1 || i2 != v2 || i3 != v3 {
t.Fatal("linear function failed")
}
}
}
// Benchmarks
func BenchmarkEncrypt_16(b *testing.B) { benchmarkEncrypt(b, 16) }
func BenchmarkDecrypt_16(b *testing.B) { benchmarkDecrypt(b, 16) }
func BenchmarkEncrypt_1K(b *testing.B) { benchmarkEncrypt(b, 1024) }
func BenchmarkDecrypt_1K(b *testing.B) { benchmarkDecrypt(b, 1024) }
func benchmarkEncrypt(b *testing.B, size int) {
c, err := NewCipher(make([]byte, 16))
if err != nil {
b.Fatalf("Failed to create Serpent instance: %s", err)
}
buf := make([]byte, c.BlockSize())
b.SetBytes(int64(size - (size % c.BlockSize())))
n := size / c.BlockSize()
b.ResetTimer()
for i := 0; i < b.N; i++ {
for j := 0; j < n; j++ {
c.Encrypt(buf, buf)
}
}
}
func benchmarkDecrypt(b *testing.B, size int) {
c, err := NewCipher(make([]byte, 16))
if err != nil {
b.Fatalf("Failed to create Serpent instance: %s", err)
}
buf := make([]byte, c.BlockSize())
b.SetBytes(int64(size - (size % c.BlockSize())))
n := size / c.BlockSize()
b.ResetTimer()
for i := 0; i < b.N; i++ {
for j := 0; j < n; j++ {
c.Decrypt(buf, buf)
}
}
}
|
