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Viewing changes to src/github.com/Azure/azure-sdk-for-go/Godeps/_workspace/src/golang.org/x/crypto/pkcs12/internal/rc2/rc2.go

  • Committer: Nicholas Skaggs
  • Date: 2016-08-26 19:28:00 UTC
  • mfrom: (1.5.1)
  • Revision ID: nicholas.skaggs@canonical.com-20160826192800-b2rgj3da7tgfdca4
* New upstream release 2.0-beta16
* Remove all quilt patches
* Ensure autopkgtests run on LXD upload (LP: #1614724)
* Update debian/copyrights

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src/github.com/Azure/azure-sdk-for-go/Godeps/_workspace/src/golang.org/x/crypto/pkcs12/internal/rc2/rc2.go
1
 
// Copyright 2015 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 rc2 implements the RC2 cipher
6
 
/*
7
 
https://www.ietf.org/rfc/rfc2268.txt
8
 
http://people.csail.mit.edu/rivest/pubs/KRRR98.pdf
9
 
 
10
 
This code is licensed under the MIT license.
11
 
*/
12
 
package rc2
13
 
 
14
 
import (
15
 
        "crypto/cipher"
16
 
        "encoding/binary"
17
 
)
18
 
 
19
 
// The rc2 block size in bytes
20
 
const BlockSize = 8
21
 
 
22
 
type rc2Cipher struct {
23
 
        k [64]uint16
24
 
}
25
 
 
26
 
// New returns a new rc2 cipher with the given key and effective key length t1
27
 
func New(key []byte, t1 int) (cipher.Block, error) {
28
 
        // TODO(dgryski): error checking for key length
29
 
        return &rc2Cipher{
30
 
                k: expandKey(key, t1),
31
 
        }, nil
32
 
}
33
 
 
34
 
func (*rc2Cipher) BlockSize() int { return BlockSize }
35
 
 
36
 
var piTable = [256]byte{
37
 
        0xd9, 0x78, 0xf9, 0xc4, 0x19, 0xdd, 0xb5, 0xed, 0x28, 0xe9, 0xfd, 0x79, 0x4a, 0xa0, 0xd8, 0x9d,
38
 
        0xc6, 0x7e, 0x37, 0x83, 0x2b, 0x76, 0x53, 0x8e, 0x62, 0x4c, 0x64, 0x88, 0x44, 0x8b, 0xfb, 0xa2,
39
 
        0x17, 0x9a, 0x59, 0xf5, 0x87, 0xb3, 0x4f, 0x13, 0x61, 0x45, 0x6d, 0x8d, 0x09, 0x81, 0x7d, 0x32,
40
 
        0xbd, 0x8f, 0x40, 0xeb, 0x86, 0xb7, 0x7b, 0x0b, 0xf0, 0x95, 0x21, 0x22, 0x5c, 0x6b, 0x4e, 0x82,
41
 
        0x54, 0xd6, 0x65, 0x93, 0xce, 0x60, 0xb2, 0x1c, 0x73, 0x56, 0xc0, 0x14, 0xa7, 0x8c, 0xf1, 0xdc,
42
 
        0x12, 0x75, 0xca, 0x1f, 0x3b, 0xbe, 0xe4, 0xd1, 0x42, 0x3d, 0xd4, 0x30, 0xa3, 0x3c, 0xb6, 0x26,
43
 
        0x6f, 0xbf, 0x0e, 0xda, 0x46, 0x69, 0x07, 0x57, 0x27, 0xf2, 0x1d, 0x9b, 0xbc, 0x94, 0x43, 0x03,
44
 
        0xf8, 0x11, 0xc7, 0xf6, 0x90, 0xef, 0x3e, 0xe7, 0x06, 0xc3, 0xd5, 0x2f, 0xc8, 0x66, 0x1e, 0xd7,
45
 
        0x08, 0xe8, 0xea, 0xde, 0x80, 0x52, 0xee, 0xf7, 0x84, 0xaa, 0x72, 0xac, 0x35, 0x4d, 0x6a, 0x2a,
46
 
        0x96, 0x1a, 0xd2, 0x71, 0x5a, 0x15, 0x49, 0x74, 0x4b, 0x9f, 0xd0, 0x5e, 0x04, 0x18, 0xa4, 0xec,
47
 
        0xc2, 0xe0, 0x41, 0x6e, 0x0f, 0x51, 0xcb, 0xcc, 0x24, 0x91, 0xaf, 0x50, 0xa1, 0xf4, 0x70, 0x39,
48
 
        0x99, 0x7c, 0x3a, 0x85, 0x23, 0xb8, 0xb4, 0x7a, 0xfc, 0x02, 0x36, 0x5b, 0x25, 0x55, 0x97, 0x31,
49
 
        0x2d, 0x5d, 0xfa, 0x98, 0xe3, 0x8a, 0x92, 0xae, 0x05, 0xdf, 0x29, 0x10, 0x67, 0x6c, 0xba, 0xc9,
50
 
        0xd3, 0x00, 0xe6, 0xcf, 0xe1, 0x9e, 0xa8, 0x2c, 0x63, 0x16, 0x01, 0x3f, 0x58, 0xe2, 0x89, 0xa9,
51
 
        0x0d, 0x38, 0x34, 0x1b, 0xab, 0x33, 0xff, 0xb0, 0xbb, 0x48, 0x0c, 0x5f, 0xb9, 0xb1, 0xcd, 0x2e,
52
 
        0xc5, 0xf3, 0xdb, 0x47, 0xe5, 0xa5, 0x9c, 0x77, 0x0a, 0xa6, 0x20, 0x68, 0xfe, 0x7f, 0xc1, 0xad,
53
 
}
54
 
 
55
 
func expandKey(key []byte, t1 int) [64]uint16 {
56
 
 
57
 
        l := make([]byte, 128)
58
 
        copy(l, key)
59
 
 
60
 
        var t = len(key)
61
 
        var t8 = (t1 + 7) / 8
62
 
        var tm = byte(255 % uint(1<<(8+uint(t1)-8*uint(t8))))
63
 
 
64
 
        for i := len(key); i < 128; i++ {
65
 
                l[i] = piTable[l[i-1]+l[uint8(i-t)]]
66
 
        }
67
 
 
68
 
        l[128-t8] = piTable[l[128-t8]&tm]
69
 
 
70
 
        for i := 127 - t8; i >= 0; i-- {
71
 
                l[i] = piTable[l[i+1]^l[i+t8]]
72
 
        }
73
 
 
74
 
        var k [64]uint16
75
 
 
76
 
        for i := range k {
77
 
                k[i] = uint16(l[2*i]) + uint16(l[2*i+1])*256
78
 
        }
79
 
 
80
 
        return k
81
 
}
82
 
 
83
 
func rotl16(x uint16, b uint) uint16 {
84
 
        return (x >> (16 - b)) | (x << b)
85
 
}
86
 
 
87
 
func (c *rc2Cipher) Encrypt(dst, src []byte) {
88
 
 
89
 
        r0 := binary.LittleEndian.Uint16(src[0:])
90
 
        r1 := binary.LittleEndian.Uint16(src[2:])
91
 
        r2 := binary.LittleEndian.Uint16(src[4:])
92
 
        r3 := binary.LittleEndian.Uint16(src[6:])
93
 
 
94
 
        var j int
95
 
 
96
 
        for j <= 16 {
97
 
                // mix r0
98
 
                r0 = r0 + c.k[j] + (r3 & r2) + ((^r3) & r1)
99
 
                r0 = rotl16(r0, 1)
100
 
                j++
101
 
 
102
 
                // mix r1
103
 
                r1 = r1 + c.k[j] + (r0 & r3) + ((^r0) & r2)
104
 
                r1 = rotl16(r1, 2)
105
 
                j++
106
 
 
107
 
                // mix r2
108
 
                r2 = r2 + c.k[j] + (r1 & r0) + ((^r1) & r3)
109
 
                r2 = rotl16(r2, 3)
110
 
                j++
111
 
 
112
 
                // mix r3
113
 
                r3 = r3 + c.k[j] + (r2 & r1) + ((^r2) & r0)
114
 
                r3 = rotl16(r3, 5)
115
 
                j++
116
 
 
117
 
        }
118
 
 
119
 
        r0 = r0 + c.k[r3&63]
120
 
        r1 = r1 + c.k[r0&63]
121
 
        r2 = r2 + c.k[r1&63]
122
 
        r3 = r3 + c.k[r2&63]
123
 
 
124
 
        for j <= 40 {
125
 
 
126
 
                // mix r0
127
 
                r0 = r0 + c.k[j] + (r3 & r2) + ((^r3) & r1)
128
 
                r0 = rotl16(r0, 1)
129
 
                j++
130
 
 
131
 
                // mix r1
132
 
                r1 = r1 + c.k[j] + (r0 & r3) + ((^r0) & r2)
133
 
                r1 = rotl16(r1, 2)
134
 
                j++
135
 
 
136
 
                // mix r2
137
 
                r2 = r2 + c.k[j] + (r1 & r0) + ((^r1) & r3)
138
 
                r2 = rotl16(r2, 3)
139
 
                j++
140
 
 
141
 
                // mix r3
142
 
                r3 = r3 + c.k[j] + (r2 & r1) + ((^r2) & r0)
143
 
                r3 = rotl16(r3, 5)
144
 
                j++
145
 
 
146
 
        }
147
 
 
148
 
        r0 = r0 + c.k[r3&63]
149
 
        r1 = r1 + c.k[r0&63]
150
 
        r2 = r2 + c.k[r1&63]
151
 
        r3 = r3 + c.k[r2&63]
152
 
 
153
 
        for j <= 60 {
154
 
 
155
 
                // mix r0
156
 
                r0 = r0 + c.k[j] + (r3 & r2) + ((^r3) & r1)
157
 
                r0 = rotl16(r0, 1)
158
 
                j++
159
 
 
160
 
                // mix r1
161
 
                r1 = r1 + c.k[j] + (r0 & r3) + ((^r0) & r2)
162
 
                r1 = rotl16(r1, 2)
163
 
                j++
164
 
 
165
 
                // mix r2
166
 
                r2 = r2 + c.k[j] + (r1 & r0) + ((^r1) & r3)
167
 
                r2 = rotl16(r2, 3)
168
 
                j++
169
 
 
170
 
                // mix r3
171
 
                r3 = r3 + c.k[j] + (r2 & r1) + ((^r2) & r0)
172
 
                r3 = rotl16(r3, 5)
173
 
                j++
174
 
        }
175
 
 
176
 
        binary.LittleEndian.PutUint16(dst[0:], r0)
177
 
        binary.LittleEndian.PutUint16(dst[2:], r1)
178
 
        binary.LittleEndian.PutUint16(dst[4:], r2)
179
 
        binary.LittleEndian.PutUint16(dst[6:], r3)
180
 
}
181
 
 
182
 
func (c *rc2Cipher) Decrypt(dst, src []byte) {
183
 
 
184
 
        r0 := binary.LittleEndian.Uint16(src[0:])
185
 
        r1 := binary.LittleEndian.Uint16(src[2:])
186
 
        r2 := binary.LittleEndian.Uint16(src[4:])
187
 
        r3 := binary.LittleEndian.Uint16(src[6:])
188
 
 
189
 
        j := 63
190
 
 
191
 
        for j >= 44 {
192
 
                // unmix r3
193
 
                r3 = rotl16(r3, 16-5)
194
 
                r3 = r3 - c.k[j] - (r2 & r1) - ((^r2) & r0)
195
 
                j--
196
 
 
197
 
                // unmix r2
198
 
                r2 = rotl16(r2, 16-3)
199
 
                r2 = r2 - c.k[j] - (r1 & r0) - ((^r1) & r3)
200
 
                j--
201
 
 
202
 
                // unmix r1
203
 
                r1 = rotl16(r1, 16-2)
204
 
                r1 = r1 - c.k[j] - (r0 & r3) - ((^r0) & r2)
205
 
                j--
206
 
 
207
 
                // unmix r0
208
 
                r0 = rotl16(r0, 16-1)
209
 
                r0 = r0 - c.k[j] - (r3 & r2) - ((^r3) & r1)
210
 
                j--
211
 
        }
212
 
 
213
 
        r3 = r3 - c.k[r2&63]
214
 
        r2 = r2 - c.k[r1&63]
215
 
        r1 = r1 - c.k[r0&63]
216
 
        r0 = r0 - c.k[r3&63]
217
 
 
218
 
        for j >= 20 {
219
 
                // unmix r3
220
 
                r3 = rotl16(r3, 16-5)
221
 
                r3 = r3 - c.k[j] - (r2 & r1) - ((^r2) & r0)
222
 
                j--
223
 
 
224
 
                // unmix r2
225
 
                r2 = rotl16(r2, 16-3)
226
 
                r2 = r2 - c.k[j] - (r1 & r0) - ((^r1) & r3)
227
 
                j--
228
 
 
229
 
                // unmix r1
230
 
                r1 = rotl16(r1, 16-2)
231
 
                r1 = r1 - c.k[j] - (r0 & r3) - ((^r0) & r2)
232
 
                j--
233
 
 
234
 
                // unmix r0
235
 
                r0 = rotl16(r0, 16-1)
236
 
                r0 = r0 - c.k[j] - (r3 & r2) - ((^r3) & r1)
237
 
                j--
238
 
 
239
 
        }
240
 
 
241
 
        r3 = r3 - c.k[r2&63]
242
 
        r2 = r2 - c.k[r1&63]
243
 
        r1 = r1 - c.k[r0&63]
244
 
        r0 = r0 - c.k[r3&63]
245
 
 
246
 
        for j >= 0 {
247
 
 
248
 
                // unmix r3
249
 
                r3 = rotl16(r3, 16-5)
250
 
                r3 = r3 - c.k[j] - (r2 & r1) - ((^r2) & r0)
251
 
                j--
252
 
 
253
 
                // unmix r2
254
 
                r2 = rotl16(r2, 16-3)
255
 
                r2 = r2 - c.k[j] - (r1 & r0) - ((^r1) & r3)
256
 
                j--
257
 
 
258
 
                // unmix r1
259
 
                r1 = rotl16(r1, 16-2)
260
 
                r1 = r1 - c.k[j] - (r0 & r3) - ((^r0) & r2)
261
 
                j--
262
 
 
263
 
                // unmix r0
264
 
                r0 = rotl16(r0, 16-1)
265
 
                r0 = r0 - c.k[j] - (r3 & r2) - ((^r3) & r1)
266
 
                j--
267
 
 
268
 
        }
269
 
 
270
 
        binary.LittleEndian.PutUint16(dst[0:], r0)
271
 
        binary.LittleEndian.PutUint16(dst[2:], r1)
272
 
        binary.LittleEndian.PutUint16(dst[4:], r2)
273
 
        binary.LittleEndian.PutUint16(dst[6:], r3)
274
 
}