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747 |
jeremybenn |
// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package aes
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import (
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"testing"
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)
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// See const.go for overview of math here.
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// Test that powx is initialized correctly.
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// (Can adapt this code to generate it too.)
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func TestPowx(t *testing.T) {
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p := 1
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for i := 0; i < len(powx); i++ {
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if powx[i] != byte(p) {
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t.Errorf("powx[%d] = %#x, want %#x", i, powx[i], p)
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}
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p <<= 1
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if p&0x100 != 0 {
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p ^= poly
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}
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}
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}
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// Multiply b and c as GF(2) polynomials modulo poly
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func mul(b, c uint32) uint32 {
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i := b
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j := c
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s := uint32(0)
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for k := uint32(1); k < 0x100 && j != 0; k <<= 1 {
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// Invariant: k == 1<
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if j&k != 0 {
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// s += i in GF(2); xor in binary
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s ^= i
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j ^= k // turn off bit to end loop early
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}
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// i *= x in GF(2) modulo the polynomial
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i <<= 1
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if i&0x100 != 0 {
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i ^= poly
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}
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}
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return s
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}
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// Test all mul inputs against bit-by-bit n² algorithm.
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func TestMul(t *testing.T) {
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for i := uint32(0); i < 256; i++ {
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for j := uint32(0); j < 256; j++ {
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// Multiply i, j bit by bit.
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s := uint8(0)
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for k := uint(0); k < 8; k++ {
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for l := uint(0); l < 8; l++ {
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if i&(1<
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s ^= powx[k+l]
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}
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}
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}
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if x := mul(i, j); x != uint32(s) {
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t.Fatalf("mul(%#x, %#x) = %#x, want %#x", i, j, x, s)
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}
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}
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}
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}
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// Check that S-boxes are inverses of each other.
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// They have more structure that we could test,
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// but if this sanity check passes, we'll assume
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// the cut and paste from the FIPS PDF worked.
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func TestSboxes(t *testing.T) {
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for i := 0; i < 256; i++ {
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if j := sbox0[sbox1[i]]; j != byte(i) {
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t.Errorf("sbox0[sbox1[%#x]] = %#x", i, j)
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}
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if j := sbox1[sbox0[i]]; j != byte(i) {
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t.Errorf("sbox1[sbox0[%#x]] = %#x", i, j)
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}
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}
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}
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// Test that encryption tables are correct.
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// (Can adapt this code to generate them too.)
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func TestTe(t *testing.T) {
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for i := 0; i < 256; i++ {
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s := uint32(sbox0[i])
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s2 := mul(s, 2)
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s3 := mul(s, 3)
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w := s2<<24 | s<<16 | s<<8 | s3
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te := [][256]uint32{te0, te1, te2, te3}
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for j := 0; j < 4; j++ {
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if x := te[j][i]; x != w {
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t.Fatalf("te[%d][%d] = %#x, want %#x", j, i, x, w)
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}
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w = w<<24 | w>>8
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}
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}
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}
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// Test that decryption tables are correct.
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// (Can adapt this code to generate them too.)
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func TestTd(t *testing.T) {
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for i := 0; i < 256; i++ {
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s := uint32(sbox1[i])
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s9 := mul(s, 0x9)
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sb := mul(s, 0xb)
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sd := mul(s, 0xd)
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se := mul(s, 0xe)
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w := se<<24 | s9<<16 | sd<<8 | sb
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td := [][256]uint32{td0, td1, td2, td3}
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for j := 0; j < 4; j++ {
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if x := td[j][i]; x != w {
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t.Fatalf("td[%d][%d] = %#x, want %#x", j, i, x, w)
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}
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w = w<<24 | w>>8
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}
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}
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}
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// Test vectors are from FIPS 197:
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// http://www.csrc.nist.gov/publications/fips/fips197/fips-197.pdf
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// Appendix A of FIPS 197: Key expansion examples
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type KeyTest struct {
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key []byte
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enc []uint32
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dec []uint32 // decryption expansion; not in FIPS 197, computed from C implementation.
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}
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var keyTests = []KeyTest{
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{
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// A.1. Expansion of a 128-bit Cipher Key
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[]byte{0x2b, 0x7e, 0x15, 0x16, 0x28, 0xae, 0xd2, 0xa6, 0xab, 0xf7, 0x15, 0x88, 0x09, 0xcf, 0x4f, 0x3c},
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[]uint32{
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0x2b7e1516, 0x28aed2a6, 0xabf71588, 0x09cf4f3c,
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0xa0fafe17, 0x88542cb1, 0x23a33939, 0x2a6c7605,
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0xf2c295f2, 0x7a96b943, 0x5935807a, 0x7359f67f,
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0x3d80477d, 0x4716fe3e, 0x1e237e44, 0x6d7a883b,
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0xef44a541, 0xa8525b7f, 0xb671253b, 0xdb0bad00,
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0xd4d1c6f8, 0x7c839d87, 0xcaf2b8bc, 0x11f915bc,
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0x6d88a37a, 0x110b3efd, 0xdbf98641, 0xca0093fd,
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0x4e54f70e, 0x5f5fc9f3, 0x84a64fb2, 0x4ea6dc4f,
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0xead27321, 0xb58dbad2, 0x312bf560, 0x7f8d292f,
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0xac7766f3, 0x19fadc21, 0x28d12941, 0x575c006e,
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0xd014f9a8, 0xc9ee2589, 0xe13f0cc8, 0xb6630ca6,
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},
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[]uint32{
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0xd014f9a8, 0xc9ee2589, 0xe13f0cc8, 0xb6630ca6,
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0xc7b5a63, 0x1319eafe, 0xb0398890, 0x664cfbb4,
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0xdf7d925a, 0x1f62b09d, 0xa320626e, 0xd6757324,
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0x12c07647, 0xc01f22c7, 0xbc42d2f3, 0x7555114a,
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0x6efcd876, 0xd2df5480, 0x7c5df034, 0xc917c3b9,
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0x6ea30afc, 0xbc238cf6, 0xae82a4b4, 0xb54a338d,
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0x90884413, 0xd280860a, 0x12a12842, 0x1bc89739,
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0x7c1f13f7, 0x4208c219, 0xc021ae48, 0x969bf7b,
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0xcc7505eb, 0x3e17d1ee, 0x82296c51, 0xc9481133,
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0x2b3708a7, 0xf262d405, 0xbc3ebdbf, 0x4b617d62,
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0x2b7e1516, 0x28aed2a6, 0xabf71588, 0x9cf4f3c,
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},
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},
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{
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// A.2. Expansion of a 192-bit Cipher Key
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[]byte{
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0x8e, 0x73, 0xb0, 0xf7, 0xda, 0x0e, 0x64, 0x52, 0xc8, 0x10, 0xf3, 0x2b, 0x80, 0x90, 0x79, 0xe5,
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0x62, 0xf8, 0xea, 0xd2, 0x52, 0x2c, 0x6b, 0x7b,
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},
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[]uint32{
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0x8e73b0f7, 0xda0e6452, 0xc810f32b, 0x809079e5,
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0x62f8ead2, 0x522c6b7b, 0xfe0c91f7, 0x2402f5a5,
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0xec12068e, 0x6c827f6b, 0x0e7a95b9, 0x5c56fec2,
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0x4db7b4bd, 0x69b54118, 0x85a74796, 0xe92538fd,
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0xe75fad44, 0xbb095386, 0x485af057, 0x21efb14f,
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0xa448f6d9, 0x4d6dce24, 0xaa326360, 0x113b30e6,
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0xa25e7ed5, 0x83b1cf9a, 0x27f93943, 0x6a94f767,
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0xc0a69407, 0xd19da4e1, 0xec1786eb, 0x6fa64971,
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0x485f7032, 0x22cb8755, 0xe26d1352, 0x33f0b7b3,
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0x40beeb28, 0x2f18a259, 0x6747d26b, 0x458c553e,
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0xa7e1466c, 0x9411f1df, 0x821f750a, 0xad07d753,
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0xca400538, 0x8fcc5006, 0x282d166a, 0xbc3ce7b5,
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0xe98ba06f, 0x448c773c, 0x8ecc7204, 0x01002202,
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},
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nil,
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},
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{
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// A.3. Expansion of a 256-bit Cipher Key
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[]byte{
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0x60, 0x3d, 0xeb, 0x10, 0x15, 0xca, 0x71, 0xbe, 0x2b, 0x73, 0xae, 0xf0, 0x85, 0x7d, 0x77, 0x81,
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0x1f, 0x35, 0x2c, 0x07, 0x3b, 0x61, 0x08, 0xd7, 0x2d, 0x98, 0x10, 0xa3, 0x09, 0x14, 0xdf, 0xf4,
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},
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[]uint32{
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0x603deb10, 0x15ca71be, 0x2b73aef0, 0x857d7781,
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0x1f352c07, 0x3b6108d7, 0x2d9810a3, 0x0914dff4,
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0x9ba35411, 0x8e6925af, 0xa51a8b5f, 0x2067fcde,
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0xa8b09c1a, 0x93d194cd, 0xbe49846e, 0xb75d5b9a,
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0xd59aecb8, 0x5bf3c917, 0xfee94248, 0xde8ebe96,
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0xb5a9328a, 0x2678a647, 0x98312229, 0x2f6c79b3,
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0x812c81ad, 0xdadf48ba, 0x24360af2, 0xfab8b464,
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0x98c5bfc9, 0xbebd198e, 0x268c3ba7, 0x09e04214,
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0x68007bac, 0xb2df3316, 0x96e939e4, 0x6c518d80,
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0xc814e204, 0x76a9fb8a, 0x5025c02d, 0x59c58239,
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0xde136967, 0x6ccc5a71, 0xfa256395, 0x9674ee15,
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0x5886ca5d, 0x2e2f31d7, 0x7e0af1fa, 0x27cf73c3,
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0x749c47ab, 0x18501dda, 0xe2757e4f, 0x7401905a,
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0xcafaaae3, 0xe4d59b34, 0x9adf6ace, 0xbd10190d,
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0xfe4890d1, 0xe6188d0b, 0x046df344, 0x706c631e,
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},
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nil,
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},
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}
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// Test key expansion against FIPS 197 examples.
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func TestExpandKey(t *testing.T) {
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L:
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for i, tt := range keyTests {
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enc := make([]uint32, len(tt.enc))
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var dec []uint32
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if tt.dec != nil {
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dec = make([]uint32, len(tt.dec))
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}
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expandKey(tt.key, enc, dec)
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for j, v := range enc {
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if v != tt.enc[j] {
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t.Errorf("key %d: enc[%d] = %#x, want %#x", i, j, v, tt.enc[j])
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continue L
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}
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}
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if dec != nil {
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for j, v := range dec {
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if v != tt.dec[j] {
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t.Errorf("key %d: dec[%d] = %#x, want %#x", i, j, v, tt.dec[j])
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continue L
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}
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}
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}
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}
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}
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// Appendix B, C of FIPS 197: Cipher examples, Example vectors.
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type CryptTest struct {
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key []byte
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in []byte
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out []byte
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}
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var encryptTests = []CryptTest{
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{
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// Appendix B.
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[]byte{0x2b, 0x7e, 0x15, 0x16, 0x28, 0xae, 0xd2, 0xa6, 0xab, 0xf7, 0x15, 0x88, 0x09, 0xcf, 0x4f, 0x3c},
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[]byte{0x32, 0x43, 0xf6, 0xa8, 0x88, 0x5a, 0x30, 0x8d, 0x31, 0x31, 0x98, 0xa2, 0xe0, 0x37, 0x07, 0x34},
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[]byte{0x39, 0x25, 0x84, 0x1d, 0x02, 0xdc, 0x09, 0xfb, 0xdc, 0x11, 0x85, 0x97, 0x19, 0x6a, 0x0b, 0x32},
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},
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{
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// Appendix C.1. AES-128
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[]byte{0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f},
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[]byte{0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff},
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[]byte{0x69, 0xc4, 0xe0, 0xd8, 0x6a, 0x7b, 0x04, 0x30, 0xd8, 0xcd, 0xb7, 0x80, 0x70, 0xb4, 0xc5, 0x5a},
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},
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{
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// Appendix C.2. AES-192
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[]byte{0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
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0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
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},
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[]byte{0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff},
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|
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[]byte{0xdd, 0xa9, 0x7c, 0xa4, 0x86, 0x4c, 0xdf, 0xe0, 0x6e, 0xaf, 0x70, 0xa0, 0xec, 0x0d, 0x71, 0x91},
|
| 269 |
|
|
},
|
| 270 |
|
|
{
|
| 271 |
|
|
// Appendix C.3. AES-256
|
| 272 |
|
|
[]byte{0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
|
| 273 |
|
|
0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
|
| 274 |
|
|
},
|
| 275 |
|
|
[]byte{0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff},
|
| 276 |
|
|
[]byte{0x8e, 0xa2, 0xb7, 0xca, 0x51, 0x67, 0x45, 0xbf, 0xea, 0xfc, 0x49, 0x90, 0x4b, 0x49, 0x60, 0x89},
|
| 277 |
|
|
},
|
| 278 |
|
|
}
|
| 279 |
|
|
|
| 280 |
|
|
// Test encryptBlock against FIPS 197 examples.
|
| 281 |
|
|
func TestEncryptBlock(t *testing.T) {
|
| 282 |
|
|
for i, tt := range encryptTests {
|
| 283 |
|
|
n := len(tt.key) + 28
|
| 284 |
|
|
enc := make([]uint32, n)
|
| 285 |
|
|
dec := make([]uint32, n)
|
| 286 |
|
|
expandKey(tt.key, enc, dec)
|
| 287 |
|
|
out := make([]byte, len(tt.in))
|
| 288 |
|
|
encryptBlock(enc, out, tt.in)
|
| 289 |
|
|
for j, v := range out {
|
| 290 |
|
|
if v != tt.out[j] {
|
| 291 |
|
|
t.Errorf("encryptBlock %d: out[%d] = %#x, want %#x", i, j, v, tt.out[j])
|
| 292 |
|
|
break
|
| 293 |
|
|
}
|
| 294 |
|
|
}
|
| 295 |
|
|
}
|
| 296 |
|
|
}
|
| 297 |
|
|
|
| 298 |
|
|
// Test decryptBlock against FIPS 197 examples.
|
| 299 |
|
|
func TestDecryptBlock(t *testing.T) {
|
| 300 |
|
|
for i, tt := range encryptTests {
|
| 301 |
|
|
n := len(tt.key) + 28
|
| 302 |
|
|
enc := make([]uint32, n)
|
| 303 |
|
|
dec := make([]uint32, n)
|
| 304 |
|
|
expandKey(tt.key, enc, dec)
|
| 305 |
|
|
plain := make([]byte, len(tt.in))
|
| 306 |
|
|
decryptBlock(dec, plain, tt.out)
|
| 307 |
|
|
for j, v := range plain {
|
| 308 |
|
|
if v != tt.in[j] {
|
| 309 |
|
|
t.Errorf("decryptBlock %d: plain[%d] = %#x, want %#x", i, j, v, tt.in[j])
|
| 310 |
|
|
break
|
| 311 |
|
|
}
|
| 312 |
|
|
}
|
| 313 |
|
|
}
|
| 314 |
|
|
}
|
| 315 |
|
|
|
| 316 |
|
|
// Test Cipher Encrypt method against FIPS 197 examples.
|
| 317 |
|
|
func TestCipherEncrypt(t *testing.T) {
|
| 318 |
|
|
for i, tt := range encryptTests {
|
| 319 |
|
|
c, err := NewCipher(tt.key)
|
| 320 |
|
|
if err != nil {
|
| 321 |
|
|
t.Errorf("NewCipher(%d bytes) = %s", len(tt.key), err)
|
| 322 |
|
|
continue
|
| 323 |
|
|
}
|
| 324 |
|
|
out := make([]byte, len(tt.in))
|
| 325 |
|
|
c.Encrypt(out, tt.in)
|
| 326 |
|
|
for j, v := range out {
|
| 327 |
|
|
if v != tt.out[j] {
|
| 328 |
|
|
t.Errorf("Cipher.Encrypt %d: out[%d] = %#x, want %#x", i, j, v, tt.out[j])
|
| 329 |
|
|
break
|
| 330 |
|
|
}
|
| 331 |
|
|
}
|
| 332 |
|
|
}
|
| 333 |
|
|
}
|
| 334 |
|
|
|
| 335 |
|
|
// Test Cipher Decrypt against FIPS 197 examples.
|
| 336 |
|
|
func TestCipherDecrypt(t *testing.T) {
|
| 337 |
|
|
for i, tt := range encryptTests {
|
| 338 |
|
|
c, err := NewCipher(tt.key)
|
| 339 |
|
|
if err != nil {
|
| 340 |
|
|
t.Errorf("NewCipher(%d bytes) = %s", len(tt.key), err)
|
| 341 |
|
|
continue
|
| 342 |
|
|
}
|
| 343 |
|
|
plain := make([]byte, len(tt.in))
|
| 344 |
|
|
c.Decrypt(plain, tt.out)
|
| 345 |
|
|
for j, v := range plain {
|
| 346 |
|
|
if v != tt.in[j] {
|
| 347 |
|
|
t.Errorf("decryptBlock %d: plain[%d] = %#x, want %#x", i, j, v, tt.in[j])
|
| 348 |
|
|
break
|
| 349 |
|
|
}
|
| 350 |
|
|
}
|
| 351 |
|
|
}
|
| 352 |
|
|
}
|
| 353 |
|
|
|
| 354 |
|
|
func BenchmarkEncrypt(b *testing.B) {
|
| 355 |
|
|
b.StopTimer()
|
| 356 |
|
|
tt := encryptTests[0]
|
| 357 |
|
|
c, err := NewCipher(tt.key)
|
| 358 |
|
|
if err != nil {
|
| 359 |
|
|
b.Fatal("NewCipher:", err)
|
| 360 |
|
|
}
|
| 361 |
|
|
out := make([]byte, len(tt.in))
|
| 362 |
|
|
b.StartTimer()
|
| 363 |
|
|
for i := 0; i < b.N; i++ {
|
| 364 |
|
|
c.Encrypt(out, tt.in)
|
| 365 |
|
|
}
|
| 366 |
|
|
}
|
