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Source file src/crypto/aes/aes_test.go

Documentation: crypto/aes

  // 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:
  //	http://www.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
  			}
  		}
  		if dec != nil {
  			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) {
  	tt := encryptTests[0]
  	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) {
  	tt := encryptTests[0]
  	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) {
  	tt := encryptTests[0]
  	n := len(tt.key) + 28
  	c := &aesCipher{make([]uint32, n), make([]uint32, n)}
  	b.ResetTimer()
  	for i := 0; i < b.N; i++ {
  		expandKey(tt.key, c.enc, c.dec)
  	}
  }
  

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