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Editing: aes_test.go
// Copyright 2009 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 aes import ( "testing" ) // See const.go for overview of math here. // Test that powx is initialized correctly. // (Can adapt this code to generate it too.) func TestPowx(t *testing.T) { p := 1 for i := 0; i < len(powx); i++ { if powx[i] != byte(p) { t.Errorf("powx[%d] = %#x, want %#x", i, powx[i], p) } p <<= 1 if p&0x100 != 0 { p ^= poly } } } // Multiply b and c as GF(2) polynomials modulo poly func mul(b, c uint32) uint32 { i := b j := c s := uint32(0) for k := uint32(1); k < 0x100 && j != 0; k <<= 1 { // Invariant: k == 1<<n, i == b * xⁿ if j&k != 0 { // s += i in GF(2); xor in binary s ^= i j ^= k // turn off bit to end loop early } // i *= x in GF(2) modulo the polynomial i <<= 1 if i&0x100 != 0 { i ^= poly } } return s } // Test all mul inputs against bit-by-bit n² algorithm. func TestMul(t *testing.T) { for i := uint32(0); i < 256; i++ { for j := uint32(0); j < 256; j++ { // Multiply i, j bit by bit. s := uint8(0) for k := uint(0); k < 8; k++ { for l := uint(0); l < 8; l++ { if i&(1<<k) != 0 && j&(1<<l) != 0 { s ^= powx[k+l] } } } if x := mul(i, j); x != uint32(s) { t.Fatalf("mul(%#x, %#x) = %#x, want %#x", i, j, x, s) } } } } // Check that S-boxes are inverses of each other. // They have more structure that we could test, // but if this sanity check passes, we'll assume // the cut and paste from the FIPS PDF worked. func TestSboxes(t *testing.T) { for i := 0; i < 256; i++ { if j := sbox0[sbox1[i]]; j != byte(i) { t.Errorf("sbox0[sbox1[%#x]] = %#x", i, j) } if j := sbox1[sbox0[i]]; j != byte(i) { t.Errorf("sbox1[sbox0[%#x]] = %#x", i, j) } } } // Test that encryption tables are correct. // (Can adapt this code to generate them too.) func TestTe(t *testing.T) { for i := 0; i < 256; i++ { s := uint32(sbox0[i]) s2 := mul(s, 2) s3 := mul(s, 3) w := s2<<24 | s<<16 | s<<8 | s3 te := [][256]uint32{te0, te1, te2, te3} for j := 0; j < 4; j++ { if x := te[j][i]; x != w { t.Fatalf("te[%d][%d] = %#x, want %#x", j, i, x, w) } w = w<<24 | w>>8 } } } // Test that decryption tables are correct. // (Can adapt this code to generate them too.) func TestTd(t *testing.T) { for i := 0; i < 256; i++ { s := uint32(sbox1[i]) s9 := mul(s, 0x9) sb := mul(s, 0xb) sd := mul(s, 0xd) se := mul(s, 0xe) w := se<<24 | s9<<16 | sd<<8 | sb td := [][256]uint32{td0, td1, td2, td3} for j := 0; j < 4; j++ { if x := td[j][i]; x != w { t.Fatalf("td[%d][%d] = %#x, want %#x", j, i, x, w) } w = w<<24 | w>>8 } } } // Test vectors are from FIPS 197: // https://csrc.nist.gov/publications/fips/fips197/fips-197.pdf // Appendix A of FIPS 197: Key expansion examples type KeyTest struct { key []byte enc []uint32 dec []uint32 // decryption expansion; not in FIPS 197, computed from C implementation. } var keyTests = []KeyTest{ { // A.1. Expansion of a 128-bit Cipher Key []byte{0x2b, 0x7e, 0x15, 0x16, 0x28, 0xae, 0xd2, 0xa6, 0xab, 0xf7, 0x15, 0x88, 0x09, 0xcf, 0x4f, 0x3c}, []uint32{ 0x2b7e1516, 0x28aed2a6, 0xabf71588, 0x09cf4f3c, 0xa0fafe17, 0x88542cb1, 0x23a33939, 0x2a6c7605, 0xf2c295f2, 0x7a96b943, 0x5935807a, 0x7359f67f, 0x3d80477d, 0x4716fe3e, 0x1e237e44, 0x6d7a883b, 0xef44a541, 0xa8525b7f, 0xb671253b, 0xdb0bad00, 0xd4d1c6f8, 0x7c839d87, 0xcaf2b8bc, 0x11f915bc, 0x6d88a37a, 0x110b3efd, 0xdbf98641, 0xca0093fd, 0x4e54f70e, 0x5f5fc9f3, 0x84a64fb2, 0x4ea6dc4f, 0xead27321, 0xb58dbad2, 0x312bf560, 0x7f8d292f, 0xac7766f3, 0x19fadc21, 0x28d12941, 0x575c006e, 0xd014f9a8, 0xc9ee2589, 0xe13f0cc8, 0xb6630ca6, }, []uint32{ 0xd014f9a8, 0xc9ee2589, 0xe13f0cc8, 0xb6630ca6, 0xc7b5a63, 0x1319eafe, 0xb0398890, 0x664cfbb4, 0xdf7d925a, 0x1f62b09d, 0xa320626e, 0xd6757324, 0x12c07647, 0xc01f22c7, 0xbc42d2f3, 0x7555114a, 0x6efcd876, 0xd2df5480, 0x7c5df034, 0xc917c3b9, 0x6ea30afc, 0xbc238cf6, 0xae82a4b4, 0xb54a338d, 0x90884413, 0xd280860a, 0x12a12842, 0x1bc89739, 0x7c1f13f7, 0x4208c219, 0xc021ae48, 0x969bf7b, 0xcc7505eb, 0x3e17d1ee, 0x82296c51, 0xc9481133, 0x2b3708a7, 0xf262d405, 0xbc3ebdbf, 0x4b617d62, 0x2b7e1516, 0x28aed2a6, 0xabf71588, 0x9cf4f3c, }, }, { // A.2. Expansion of a 192-bit Cipher Key []byte{ 0x8e, 0x73, 0xb0, 0xf7, 0xda, 0x0e, 0x64, 0x52, 0xc8, 0x10, 0xf3, 0x2b, 0x80, 0x90, 0x79, 0xe5, 0x62, 0xf8, 0xea, 0xd2, 0x52, 0x2c, 0x6b, 0x7b, }, []uint32{ 0x8e73b0f7, 0xda0e6452, 0xc810f32b, 0x809079e5, 0x62f8ead2, 0x522c6b7b, 0xfe0c91f7, 0x2402f5a5, 0xec12068e, 0x6c827f6b, 0x0e7a95b9, 0x5c56fec2, 0x4db7b4bd, 0x69b54118, 0x85a74796, 0xe92538fd, 0xe75fad44, 0xbb095386, 0x485af057, 0x21efb14f, 0xa448f6d9, 0x4d6dce24, 0xaa326360, 0x113b30e6, 0xa25e7ed5, 0x83b1cf9a, 0x27f93943, 0x6a94f767, 0xc0a69407, 0xd19da4e1, 0xec1786eb, 0x6fa64971, 0x485f7032, 0x22cb8755, 0xe26d1352, 0x33f0b7b3, 0x40beeb28, 0x2f18a259, 0x6747d26b, 0x458c553e, 0xa7e1466c, 0x9411f1df, 0x821f750a, 0xad07d753, 0xca400538, 0x8fcc5006, 0x282d166a, 0xbc3ce7b5, 0xe98ba06f, 0x448c773c, 0x8ecc7204, 0x01002202, }, nil, }, { // A.3. Expansion of a 256-bit Cipher Key []byte{ 0x60, 0x3d, 0xeb, 0x10, 0x15, 0xca, 0x71, 0xbe, 0x2b, 0x73, 0xae, 0xf0, 0x85, 0x7d, 0x77, 0x81, 0x1f, 0x35, 0x2c, 0x07, 0x3b, 0x61, 0x08, 0xd7, 0x2d, 0x98, 0x10, 0xa3, 0x09, 0x14, 0xdf, 0xf4, }, []uint32{ 0x603deb10, 0x15ca71be, 0x2b73aef0, 0x857d7781, 0x1f352c07, 0x3b6108d7, 0x2d9810a3, 0x0914dff4, 0x9ba35411, 0x8e6925af, 0xa51a8b5f, 0x2067fcde, 0xa8b09c1a, 0x93d194cd, 0xbe49846e, 0xb75d5b9a, 0xd59aecb8, 0x5bf3c917, 0xfee94248, 0xde8ebe96, 0xb5a9328a, 0x2678a647, 0x98312229, 0x2f6c79b3, 0x812c81ad, 0xdadf48ba, 0x24360af2, 0xfab8b464, 0x98c5bfc9, 0xbebd198e, 0x268c3ba7, 0x09e04214, 0x68007bac, 0xb2df3316, 0x96e939e4, 0x6c518d80, 0xc814e204, 0x76a9fb8a, 0x5025c02d, 0x59c58239, 0xde136967, 0x6ccc5a71, 0xfa256395, 0x9674ee15, 0x5886ca5d, 0x2e2f31d7, 0x7e0af1fa, 0x27cf73c3, 0x749c47ab, 0x18501dda, 0xe2757e4f, 0x7401905a, 0xcafaaae3, 0xe4d59b34, 0x9adf6ace, 0xbd10190d, 0xfe4890d1, 0xe6188d0b, 0x046df344, 0x706c631e, }, nil, }, } // Test key expansion against FIPS 197 examples. func TestExpandKey(t *testing.T) { L: for i, tt := range keyTests { enc := make([]uint32, len(tt.enc)) var dec []uint32 if tt.dec != nil { dec = make([]uint32, len(tt.dec)) } // This test could only test Go version of expandKey because asm // version might use different memory layout for expanded keys // This is OK because we don't expose expanded keys to the outside expandKeyGo(tt.key, enc, dec) for j, v := range enc { if v != tt.enc[j] { t.Errorf("key %d: enc[%d] = %#x, want %#x", i, j, v, tt.enc[j]) continue L } } for j, v := range dec { if v != tt.dec[j] { t.Errorf("key %d: dec[%d] = %#x, want %#x", i, j, v, tt.dec[j]) continue L } } } } // Appendix B, C of FIPS 197: Cipher examples, Example vectors. type CryptTest struct { key []byte in []byte out []byte } var encryptTests = []CryptTest{ { // Appendix B. []byte{0x2b, 0x7e, 0x15, 0x16, 0x28, 0xae, 0xd2, 0xa6, 0xab, 0xf7, 0x15, 0x88, 0x09, 0xcf, 0x4f, 0x3c}, []byte{0x32, 0x43, 0xf6, 0xa8, 0x88, 0x5a, 0x30, 0x8d, 0x31, 0x31, 0x98, 0xa2, 0xe0, 0x37, 0x07, 0x34}, []byte{0x39, 0x25, 0x84, 0x1d, 0x02, 0xdc, 0x09, 0xfb, 0xdc, 0x11, 0x85, 0x97, 0x19, 0x6a, 0x0b, 0x32}, }, { // Appendix C.1. AES-128 []byte{0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f}, []byte{0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff}, []byte{0x69, 0xc4, 0xe0, 0xd8, 0x6a, 0x7b, 0x04, 0x30, 0xd8, 0xcd, 0xb7, 0x80, 0x70, 0xb4, 0xc5, 0x5a}, }, { // Appendix C.2. AES-192 []byte{0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, }, []byte{0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff}, []byte{0xdd, 0xa9, 0x7c, 0xa4, 0x86, 0x4c, 0xdf, 0xe0, 0x6e, 0xaf, 0x70, 0xa0, 0xec, 0x0d, 0x71, 0x91}, }, { // Appendix C.3. AES-256 []byte{0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, }, []byte{0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff}, []byte{0x8e, 0xa2, 0xb7, 0xca, 0x51, 0x67, 0x45, 0xbf, 0xea, 0xfc, 0x49, 0x90, 0x4b, 0x49, 0x60, 0x89}, }, } // Test Cipher Encrypt method against FIPS 197 examples. func TestCipherEncrypt(t *testing.T) { for i, tt := range encryptTests { c, err := NewCipher(tt.key) if err != nil { t.Errorf("NewCipher(%d bytes) = %s", len(tt.key), err) continue } out := make([]byte, len(tt.in)) c.Encrypt(out, tt.in) for j, v := range out { if v != tt.out[j] { t.Errorf("Cipher.Encrypt %d: out[%d] = %#x, want %#x", i, j, v, tt.out[j]) break } } } } // Test Cipher Decrypt against FIPS 197 examples. func TestCipherDecrypt(t *testing.T) { for i, tt := range encryptTests { c, err := NewCipher(tt.key) if err != nil { t.Errorf("NewCipher(%d bytes) = %s", len(tt.key), err) continue } plain := make([]byte, len(tt.in)) c.Decrypt(plain, tt.out) for j, v := range plain { if v != tt.in[j] { t.Errorf("decryptBlock %d: plain[%d] = %#x, want %#x", i, j, v, tt.in[j]) break } } } } // Test short input/output. // Assembly used to not notice. // See issue 7928. func TestShortBlocks(t *testing.T) { bytes := func(n int) []byte { return make([]byte, n) } c, _ := NewCipher(bytes(16)) mustPanic(t, "crypto/aes: input not full block", func() { c.Encrypt(bytes(1), bytes(1)) }) mustPanic(t, "crypto/aes: input not full block", func() { c.Decrypt(bytes(1), bytes(1)) }) mustPanic(t, "crypto/aes: input not full block", func() { c.Encrypt(bytes(100), bytes(1)) }) mustPanic(t, "crypto/aes: input not full block", func() { c.Decrypt(bytes(100), bytes(1)) }) mustPanic(t, "crypto/aes: output not full block", func() { c.Encrypt(bytes(1), bytes(100)) }) mustPanic(t, "crypto/aes: output not full block", func() { c.Decrypt(bytes(1), bytes(100)) }) } func mustPanic(t *testing.T, msg string, f func()) { defer func() { err := recover() if err == nil { t.Errorf("function did not panic, wanted %q", msg) } else if err != msg { t.Errorf("got panic %v, wanted %q", err, msg) } }() f() } func BenchmarkEncrypt(b *testing.B) { b.Run("AES-128", func(b *testing.B) { benchmarkEncrypt(b, encryptTests[1]) }) b.Run("AES-192", func(b *testing.B) { benchmarkEncrypt(b, encryptTests[2]) }) b.Run("AES-256", func(b *testing.B) { benchmarkEncrypt(b, encryptTests[3]) }) } func benchmarkEncrypt(b *testing.B, tt CryptTest) { c, err := NewCipher(tt.key) if err != nil { b.Fatal("NewCipher:", err) } out := make([]byte, len(tt.in)) b.SetBytes(int64(len(out))) b.ResetTimer() for i := 0; i < b.N; i++ { c.Encrypt(out, tt.in) } } func BenchmarkDecrypt(b *testing.B) { b.Run("AES-128", func(b *testing.B) { benchmarkDecrypt(b, encryptTests[1]) }) b.Run("AES-192", func(b *testing.B) { benchmarkDecrypt(b, encryptTests[2]) }) b.Run("AES-256", func(b *testing.B) { benchmarkDecrypt(b, encryptTests[3]) }) } func benchmarkDecrypt(b *testing.B, tt CryptTest) { c, err := NewCipher(tt.key) if err != nil { b.Fatal("NewCipher:", err) } out := make([]byte, len(tt.out)) b.SetBytes(int64(len(out))) b.ResetTimer() for i := 0; i < b.N; i++ { c.Decrypt(out, tt.out) } } func BenchmarkExpand(b *testing.B) { b.Run("AES-128", func(b *testing.B) { benchmarkExpand(b, encryptTests[1]) }) b.Run("AES-192", func(b *testing.B) { benchmarkExpand(b, encryptTests[2]) }) b.Run("AES-256", func(b *testing.B) { benchmarkExpand(b, encryptTests[3]) }) } func benchmarkExpand(b *testing.B, tt CryptTest) { c := &aesCipher{l: uint8(len(tt.key) + 28)} b.ResetTimer() for i := 0; i < b.N; i++ { expandKey(tt.key, c.enc[:c.l], c.dec[:c.l]) } } func BenchmarkCreateCipher(b *testing.B) { b.Run("AES-128", func(b *testing.B) { benchmarkCreateCipher(b, encryptTests[1]) }) b.Run("AES-192", func(b *testing.B) { benchmarkCreateCipher(b, encryptTests[2]) }) b.Run("AES-256", func(b *testing.B) { benchmarkCreateCipher(b, encryptTests[3]) }) } func benchmarkCreateCipher(b *testing.B, tt CryptTest) { b.ReportAllocs() for i := 0; i < b.N; i++ { if _, err := NewCipher(tt.key); err != nil { b.Fatal(err) } } }
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