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      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 	//   http://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: http://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 	testBlock(t, (*Cipher).XORKeyStream)
    121 }
    122 
    123 // Test the pure Go version.
    124 // Because we have assembly for amd64, 386, and arm, this prevents
    125 // bitrot of the reference implementations.
    126 func TestBlockGeneric(t *testing.T) {
    127 	testBlock(t, (*Cipher).xorKeyStreamGeneric)
    128 }
    129 
    130 func testBlock(t *testing.T, xor func(c *Cipher, dst, src []byte)) {
    131 	c1a, _ := NewCipher(golden[0].key)
    132 	c1b, _ := NewCipher(golden[1].key)
    133 	data1 := make([]byte, 1<<20)
    134 	for i := range data1 {
    135 		xor(c1a, data1[i:i+1], data1[i:i+1])
    136 		xor(c1b, data1[i:i+1], data1[i:i+1])
    137 	}
    138 
    139 	c2a, _ := NewCipher(golden[0].key)
    140 	c2b, _ := NewCipher(golden[1].key)
    141 	data2 := make([]byte, 1<<20)
    142 	xor(c2a, data2, data2)
    143 	xor(c2b, data2, data2)
    144 
    145 	if !bytes.Equal(data1, data2) {
    146 		t.Fatalf("bad block")
    147 	}
    148 }
    149 
    150 func benchmark(b *testing.B, size int64) {
    151 	buf := make([]byte, size)
    152 	c, err := NewCipher(golden[0].key)
    153 	if err != nil {
    154 		panic(err)
    155 	}
    156 	b.SetBytes(size)
    157 
    158 	for i := 0; i < b.N; i++ {
    159 		c.XORKeyStream(buf, buf)
    160 	}
    161 }
    162 
    163 func BenchmarkRC4_128(b *testing.B) {
    164 	benchmark(b, 128)
    165 }
    166 
    167 func BenchmarkRC4_1K(b *testing.B) {
    168 	benchmark(b, 1024)
    169 }
    170 
    171 func BenchmarkRC4_8K(b *testing.B) {
    172 	benchmark(b, 8096)
    173 }
    174