twofish_test.go

Documentation: golang.org/x/crypto/twofish

     1  // Copyright 2011 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package twofish
     6  
     7  import (
     8  	"bytes"
     9  	"testing"
    10  )
    11  
    12  var qbox = [2][4][16]byte{
    13  	{
    14  		{0x8, 0x1, 0x7, 0xD, 0x6, 0xF, 0x3, 0x2, 0x0, 0xB, 0x5, 0x9, 0xE, 0xC, 0xA, 0x4},
    15  		{0xE, 0xC, 0xB, 0x8, 0x1, 0x2, 0x3, 0x5, 0xF, 0x4, 0xA, 0x6, 0x7, 0x0, 0x9, 0xD},
    16  		{0xB, 0xA, 0x5, 0xE, 0x6, 0xD, 0x9, 0x0, 0xC, 0x8, 0xF, 0x3, 0x2, 0x4, 0x7, 0x1},
    17  		{0xD, 0x7, 0xF, 0x4, 0x1, 0x2, 0x6, 0xE, 0x9, 0xB, 0x3, 0x0, 0x8, 0x5, 0xC, 0xA},
    18  	},
    19  	{
    20  		{0x2, 0x8, 0xB, 0xD, 0xF, 0x7, 0x6, 0xE, 0x3, 0x1, 0x9, 0x4, 0x0, 0xA, 0xC, 0x5},
    21  		{0x1, 0xE, 0x2, 0xB, 0x4, 0xC, 0x3, 0x7, 0x6, 0xD, 0xA, 0x5, 0xF, 0x9, 0x0, 0x8},
    22  		{0x4, 0xC, 0x7, 0x5, 0x1, 0x6, 0x9, 0xA, 0x0, 0xE, 0xD, 0x8, 0x2, 0xB, 0x3, 0xF},
    23  		{0xB, 0x9, 0x5, 0x1, 0xC, 0x3, 0xD, 0xE, 0x6, 0x4, 0x7, 0xF, 0x2, 0x0, 0x8, 0xA},
    24  	},
    25  }
    26  
    27  // genSbox generates the variable sbox
    28  func genSbox(qi int, x byte) byte {
    29  	a0, b0 := x/16, x%16
    30  	for i := 0; i < 2; i++ {
    31  		a1 := a0 ^ b0
    32  		b1 := (a0 ^ ((b0 << 3) | (b0 >> 1)) ^ (a0 << 3)) & 15
    33  		a0 = qbox[qi][2*i][a1]
    34  		b0 = qbox[qi][2*i+1][b1]
    35  	}
    36  	return (b0 << 4) + a0
    37  }
    38  
    39  func TestSbox(t *testing.T) {
    40  	for n := range sbox {
    41  		for m := range sbox[n] {
    42  			if genSbox(n, byte(m)) != sbox[n][m] {
    43  				t.Errorf("#%d|%d: sbox value = %d want %d", n, m, sbox[n][m], genSbox(n, byte(m)))
    44  			}
    45  		}
    46  	}
    47  }
    48  
    49  var testVectors = []struct {
    50  	key []byte
    51  	dec []byte
    52  	enc []byte
    53  }{
    54  	// These tests are extracted from LibTom
    55  	{
    56  		[]byte{0x9F, 0x58, 0x9F, 0x5C, 0xF6, 0x12, 0x2C, 0x32, 0xB6, 0xBF, 0xEC, 0x2F, 0x2A, 0xE8, 0xC3, 0x5A},
    57  		[]byte{0xD4, 0x91, 0xDB, 0x16, 0xE7, 0xB1, 0xC3, 0x9E, 0x86, 0xCB, 0x08, 0x6B, 0x78, 0x9F, 0x54, 0x19},
    58  		[]byte{0x01, 0x9F, 0x98, 0x09, 0xDE, 0x17, 0x11, 0x85, 0x8F, 0xAA, 0xC3, 0xA3, 0xBA, 0x20, 0xFB, 0xC3},
    59  	},
    60  	{
    61  		[]byte{0x88, 0xB2, 0xB2, 0x70, 0x6B, 0x10, 0x5E, 0x36, 0xB4, 0x46, 0xBB, 0x6D, 0x73, 0x1A, 0x1E, 0x88,
    62  			0xEF, 0xA7, 0x1F, 0x78, 0x89, 0x65, 0xBD, 0x44},
    63  		[]byte{0x39, 0xDA, 0x69, 0xD6, 0xBA, 0x49, 0x97, 0xD5, 0x85, 0xB6, 0xDC, 0x07, 0x3C, 0xA3, 0x41, 0xB2},
    64  		[]byte{0x18, 0x2B, 0x02, 0xD8, 0x14, 0x97, 0xEA, 0x45, 0xF9, 0xDA, 0xAC, 0xDC, 0x29, 0x19, 0x3A, 0x65},
    65  	},
    66  	{
    67  		[]byte{0xD4, 0x3B, 0xB7, 0x55, 0x6E, 0xA3, 0x2E, 0x46, 0xF2, 0xA2, 0x82, 0xB7, 0xD4, 0x5B, 0x4E, 0x0D,
    68  			0x57, 0xFF, 0x73, 0x9D, 0x4D, 0xC9, 0x2C, 0x1B, 0xD7, 0xFC, 0x01, 0x70, 0x0C, 0xC8, 0x21, 0x6F},
    69  		[]byte{0x90, 0xAF, 0xE9, 0x1B, 0xB2, 0x88, 0x54, 0x4F, 0x2C, 0x32, 0xDC, 0x23, 0x9B, 0x26, 0x35, 0xE6},
    70  		[]byte{0x6C, 0xB4, 0x56, 0x1C, 0x40, 0xBF, 0x0A, 0x97, 0x05, 0x93, 0x1C, 0xB6, 0xD4, 0x08, 0xE7, 0xFA},
    71  	},
    72  	// These tests are derived from https://www.schneier.com/code/ecb_ival.txt
    73  	{
    74  		[]byte{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
    75  		[]byte{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
    76  		[]byte{0x9F, 0x58, 0x9F, 0x5C, 0xF6, 0x12, 0x2C, 0x32, 0xB6, 0xBF, 0xEC, 0x2F, 0x2A, 0xE8, 0xC3, 0x5A},
    77  	},
    78  	{
    79  		[]byte{0x01, 0x23, 0x45, 0x67, 0x89, 0xAB, 0xCD, 0xEF, 0xFE, 0xDC, 0xBA, 0x98, 0x76, 0x54, 0x32, 0x10,
    80  			0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77,
    81  		},
    82  		[]byte{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
    83  		[]byte{0xCF, 0xD1, 0xD2, 0xE5, 0xA9, 0xBE, 0x9C, 0xDF, 0x50, 0x1F, 0x13, 0xB8, 0x92, 0xBD, 0x22, 0x48},
    84  	},
    85  	{
    86  		[]byte{0x01, 0x23, 0x45, 0x67, 0x89, 0xAB, 0xCD, 0xEF, 0xFE, 0xDC, 0xBA, 0x98, 0x76, 0x54, 0x32, 0x10,
    87  			0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88, 0x99, 0xAA, 0xBB, 0xCC, 0xDD, 0xEE, 0xFF,
    88  		},
    89  		[]byte{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
    90  		[]byte{0x37, 0x52, 0x7B, 0xE0, 0x05, 0x23, 0x34, 0xB8, 0x9F, 0x0C, 0xFC, 0xCA, 0xE8, 0x7C, 0xFA, 0x20},
    91  	},
    92  }
    93  
    94  func TestCipher(t *testing.T) {
    95  	for n, tt := range testVectors {
    96  		// Test if the plaintext (dec) is encrypts to the given
    97  		// ciphertext (enc) using the given key. Test also if enc can
    98  		// be decrypted again into dec.
    99  		c, err := NewCipher(tt.key)
   100  		if err != nil {
   101  			t.Errorf("#%d: NewCipher: %v", n, err)
   102  			return
   103  		}
   104  
   105  		buf := make([]byte, 16)
   106  		c.Encrypt(buf, tt.dec)
   107  		if !bytes.Equal(buf, tt.enc) {
   108  			t.Errorf("#%d: encrypt = %x want %x", n, buf, tt.enc)
   109  		}
   110  		c.Decrypt(buf, tt.enc)
   111  		if !bytes.Equal(buf, tt.dec) {
   112  			t.Errorf("#%d: decrypt = %x want %x", n, buf, tt.dec)
   113  		}
   114  
   115  		// Test that 16 zero bytes, encrypted 1000 times then decrypted
   116  		// 1000 times results in zero bytes again.
   117  		zero := make([]byte, 16)
   118  		buf = make([]byte, 16)
   119  		for i := 0; i < 1000; i++ {
   120  			c.Encrypt(buf, buf)
   121  		}
   122  		for i := 0; i < 1000; i++ {
   123  			c.Decrypt(buf, buf)
   124  		}
   125  		if !bytes.Equal(buf, zero) {
   126  			t.Errorf("#%d: encrypt/decrypt 1000: have %x want %x", n, buf, zero)
   127  		}
   128  	}
   129  }
   130
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