rc4_test.go

     1  // Copyright 2009 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 rc4
     6  
     7  import (
     8  	"bytes"
     9  	"fmt"
    10  	"testing"
    11  )
    12  
    13  type rc4Test struct {
    14  	key, keystream []byte
    15  }
    16  
    17  var golden = []rc4Test{
    18  	// Test vectors from the original cypherpunk posting of ARC4:
    19  	//   https://groups.google.com/group/sci.crypt/msg/10a300c9d21afca0?pli=1
    20  	{
    21  		[]byte{0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef},
    22  		[]byte{0x74, 0x94, 0xc2, 0xe7, 0x10, 0x4b, 0x08, 0x79},
    23  	},
    24  	{
    25  		[]byte{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
    26  		[]byte{0xde, 0x18, 0x89, 0x41, 0xa3, 0x37, 0x5d, 0x3a},
    27  	},
    28  	{
    29  		[]byte{0xef, 0x01, 0x23, 0x45},
    30  		[]byte{0xd6, 0xa1, 0x41, 0xa7, 0xec, 0x3c, 0x38, 0xdf, 0xbd, 0x61},
    31  	},
    32  
    33  	// Test vectors from the Wikipedia page: https://en.wikipedia.org/wiki/RC4
    34  	{
    35  		[]byte{0x4b, 0x65, 0x79},
    36  		[]byte{0xeb, 0x9f, 0x77, 0x81, 0xb7, 0x34, 0xca, 0x72, 0xa7, 0x19},
    37  	},
    38  	{
    39  		[]byte{0x57, 0x69, 0x6b, 0x69},
    40  		[]byte{0x60, 0x44, 0xdb, 0x6d, 0x41, 0xb7},
    41  	},
    42  	{
    43  		[]byte{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
    44  		[]byte{
    45  			0xde, 0x18, 0x89, 0x41, 0xa3, 0x37, 0x5d, 0x3a,
    46  			0x8a, 0x06, 0x1e, 0x67, 0x57, 0x6e, 0x92, 0x6d,
    47  			0xc7, 0x1a, 0x7f, 0xa3, 0xf0, 0xcc, 0xeb, 0x97,
    48  			0x45, 0x2b, 0x4d, 0x32, 0x27, 0x96, 0x5f, 0x9e,
    49  			0xa8, 0xcc, 0x75, 0x07, 0x6d, 0x9f, 0xb9, 0xc5,
    50  			0x41, 0x7a, 0xa5, 0xcb, 0x30, 0xfc, 0x22, 0x19,
    51  			0x8b, 0x34, 0x98, 0x2d, 0xbb, 0x62, 0x9e, 0xc0,
    52  			0x4b, 0x4f, 0x8b, 0x05, 0xa0, 0x71, 0x08, 0x50,
    53  			0x92, 0xa0, 0xc3, 0x58, 0x4a, 0x48, 0xe4, 0xa3,
    54  			0x0a, 0x39, 0x7b, 0x8a, 0xcd, 0x1d, 0x00, 0x9e,
    55  			0xc8, 0x7d, 0x68, 0x11, 0xf2, 0x2c, 0xf4, 0x9c,
    56  			0xa3, 0xe5, 0x93, 0x54, 0xb9, 0x45, 0x15, 0x35,
    57  			0xa2, 0x18, 0x7a, 0x86, 0x42, 0x6c, 0xca, 0x7d,
    58  			0x5e, 0x82, 0x3e, 0xba, 0x00, 0x44, 0x12, 0x67,
    59  			0x12, 0x57, 0xb8, 0xd8, 0x60, 0xae, 0x4c, 0xbd,
    60  			0x4c, 0x49, 0x06, 0xbb, 0xc5, 0x35, 0xef, 0xe1,
    61  			0x58, 0x7f, 0x08, 0xdb, 0x33, 0x95, 0x5c, 0xdb,
    62  			0xcb, 0xad, 0x9b, 0x10, 0xf5, 0x3f, 0xc4, 0xe5,
    63  			0x2c, 0x59, 0x15, 0x65, 0x51, 0x84, 0x87, 0xfe,
    64  			0x08, 0x4d, 0x0e, 0x3f, 0x03, 0xde, 0xbc, 0xc9,
    65  			0xda, 0x1c, 0xe9, 0x0d, 0x08, 0x5c, 0x2d, 0x8a,
    66  			0x19, 0xd8, 0x37, 0x30, 0x86, 0x16, 0x36, 0x92,
    67  			0x14, 0x2b, 0xd8, 0xfc, 0x5d, 0x7a, 0x73, 0x49,
    68  			0x6a, 0x8e, 0x59, 0xee, 0x7e, 0xcf, 0x6b, 0x94,
    69  			0x06, 0x63, 0xf4, 0xa6, 0xbe, 0xe6, 0x5b, 0xd2,
    70  			0xc8, 0x5c, 0x46, 0x98, 0x6c, 0x1b, 0xef, 0x34,
    71  			0x90, 0xd3, 0x7b, 0x38, 0xda, 0x85, 0xd3, 0x2e,
    72  			0x97, 0x39, 0xcb, 0x23, 0x4a, 0x2b, 0xe7, 0x40,
    73  		},
    74  	},
    75  }
    76  
    77  func testEncrypt(t *testing.T, desc string, c *Cipher, src, expect []byte) {
    78  	dst := make([]byte, len(src))
    79  	c.XORKeyStream(dst, src)
    80  	for i, v := range dst {
    81  		if v != expect[i] {
    82  			t.Fatalf("%s: mismatch at byte %d:\nhave %x\nwant %x", desc, i, dst, expect)
    83  		}
    84  	}
    85  }
    86  
    87  func TestGolden(t *testing.T) {
    88  	for gi, g := range golden {
    89  		data := make([]byte, len(g.keystream))
    90  		for i := range data {
    91  			data[i] = byte(i)
    92  		}
    93  
    94  		expect := make([]byte, len(g.keystream))
    95  		for i := range expect {
    96  			expect[i] = byte(i) ^ g.keystream[i]
    97  		}
    98  
    99  		for size := 1; size <= len(g.keystream); size++ {
   100  			c, err := NewCipher(g.key)
   101  			if err != nil {
   102  				t.Fatalf("#%d: NewCipher: %v", gi, err)
   103  			}
   104  
   105  			off := 0
   106  			for off < len(g.keystream) {
   107  				n := len(g.keystream) - off
   108  				if n > size {
   109  					n = size
   110  				}
   111  				desc := fmt.Sprintf("#%d@[%d:%d]", gi, off, off+n)
   112  				testEncrypt(t, desc, c, data[off:off+n], expect[off:off+n])
   113  				off += n
   114  			}
   115  		}
   116  	}
   117  }
   118  
   119  func TestBlock(t *testing.T) {
   120  	c1a, _ := NewCipher(golden[0].key)
   121  	c1b, _ := NewCipher(golden[1].key)
   122  	data1 := make([]byte, 1<<20)
   123  	for i := range data1 {
   124  		c1a.XORKeyStream(data1[i:i+1], data1[i:i+1])
   125  		c1b.XORKeyStream(data1[i:i+1], data1[i:i+1])
   126  	}
   127  
   128  	c2a, _ := NewCipher(golden[0].key)
   129  	c2b, _ := NewCipher(golden[1].key)
   130  	data2 := make([]byte, 1<<20)
   131  	c2a.XORKeyStream(data2, data2)
   132  	c2b.XORKeyStream(data2, data2)
   133  
   134  	if !bytes.Equal(data1, data2) {
   135  		t.Fatalf("bad block")
   136  	}
   137  }
   138  
   139  func benchmark(b *testing.B, size int64) {
   140  	buf := make([]byte, size)
   141  	c, err := NewCipher(golden[0].key)
   142  	if err != nil {
   143  		panic(err)
   144  	}
   145  	b.SetBytes(size)
   146  
   147  	for i := 0; i < b.N; i++ {
   148  		c.XORKeyStream(buf, buf)
   149  	}
   150  }
   151  
   152  func BenchmarkRC4_128(b *testing.B) {
   153  	benchmark(b, 128)
   154  }
   155  
   156  func BenchmarkRC4_1K(b *testing.B) {
   157  	benchmark(b, 1024)
   158  }
   159  
   160  func BenchmarkRC4_8K(b *testing.B) {
   161  	benchmark(b, 8096)
   162  }
   163
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