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58964a49 | 1 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
d02b48c6 RE |
2 | * All rights reserved. |
3 | * | |
4 | * This package is an SSL implementation written | |
5 | * by Eric Young (eay@cryptsoft.com). | |
6 | * The implementation was written so as to conform with Netscapes SSL. | |
0f113f3e | 7 | * |
d02b48c6 RE |
8 | * This library is free for commercial and non-commercial use as long as |
9 | * the following conditions are aheared to. The following conditions | |
10 | * apply to all code found in this distribution, be it the RC4, RSA, | |
11 | * lhash, DES, etc., code; not just the SSL code. The SSL documentation | |
12 | * included with this distribution is covered by the same copyright terms | |
13 | * except that the holder is Tim Hudson (tjh@cryptsoft.com). | |
0f113f3e | 14 | * |
d02b48c6 RE |
15 | * Copyright remains Eric Young's, and as such any Copyright notices in |
16 | * the code are not to be removed. | |
17 | * If this package is used in a product, Eric Young should be given attribution | |
18 | * as the author of the parts of the library used. | |
19 | * This can be in the form of a textual message at program startup or | |
20 | * in documentation (online or textual) provided with the package. | |
0f113f3e | 21 | * |
d02b48c6 RE |
22 | * Redistribution and use in source and binary forms, with or without |
23 | * modification, are permitted provided that the following conditions | |
24 | * are met: | |
25 | * 1. Redistributions of source code must retain the copyright | |
26 | * notice, this list of conditions and the following disclaimer. | |
27 | * 2. Redistributions in binary form must reproduce the above copyright | |
28 | * notice, this list of conditions and the following disclaimer in the | |
29 | * documentation and/or other materials provided with the distribution. | |
30 | * 3. All advertising materials mentioning features or use of this software | |
31 | * must display the following acknowledgement: | |
32 | * "This product includes cryptographic software written by | |
33 | * Eric Young (eay@cryptsoft.com)" | |
34 | * The word 'cryptographic' can be left out if the rouines from the library | |
35 | * being used are not cryptographic related :-). | |
0f113f3e | 36 | * 4. If you include any Windows specific code (or a derivative thereof) from |
d02b48c6 RE |
37 | * the apps directory (application code) you must include an acknowledgement: |
38 | * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" | |
0f113f3e | 39 | * |
d02b48c6 RE |
40 | * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND |
41 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
42 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
43 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE | |
44 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
45 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
46 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
47 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
48 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
49 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
50 | * SUCH DAMAGE. | |
0f113f3e | 51 | * |
d02b48c6 RE |
52 | * The licence and distribution terms for any publically available version or |
53 | * derivative of this code cannot be changed. i.e. this code cannot simply be | |
54 | * copied and put under another distribution licence | |
55 | * [including the GNU Public Licence.] | |
56 | */ | |
57 | ||
58 | #include "des_locl.h" | |
59 | ||
60 | /* RSA's DESX */ | |
61 | ||
c2e4f17c | 62 | void DES_xcbc_encrypt(const unsigned char *in, unsigned char *out, |
0f113f3e MC |
63 | long length, DES_key_schedule *schedule, |
64 | DES_cblock *ivec, const_DES_cblock *inw, | |
65 | const_DES_cblock *outw, int enc) | |
66 | { | |
67 | register DES_LONG tin0, tin1; | |
68 | register DES_LONG tout0, tout1, xor0, xor1; | |
69 | register DES_LONG inW0, inW1, outW0, outW1; | |
70 | register const unsigned char *in2; | |
71 | register long l = length; | |
72 | DES_LONG tin[2]; | |
73 | unsigned char *iv; | |
d02b48c6 | 74 | |
0f113f3e MC |
75 | in2 = &(*inw)[0]; |
76 | c2l(in2, inW0); | |
77 | c2l(in2, inW1); | |
78 | in2 = &(*outw)[0]; | |
79 | c2l(in2, outW0); | |
80 | c2l(in2, outW1); | |
d02b48c6 | 81 | |
0f113f3e | 82 | iv = &(*ivec)[0]; |
d02b48c6 | 83 | |
0f113f3e MC |
84 | if (enc) { |
85 | c2l(iv, tout0); | |
86 | c2l(iv, tout1); | |
87 | for (l -= 8; l >= 0; l -= 8) { | |
88 | c2l(in, tin0); | |
89 | c2l(in, tin1); | |
90 | tin0 ^= tout0 ^ inW0; | |
91 | tin[0] = tin0; | |
92 | tin1 ^= tout1 ^ inW1; | |
93 | tin[1] = tin1; | |
94 | DES_encrypt1(tin, schedule, DES_ENCRYPT); | |
95 | tout0 = tin[0] ^ outW0; | |
96 | l2c(tout0, out); | |
97 | tout1 = tin[1] ^ outW1; | |
98 | l2c(tout1, out); | |
99 | } | |
100 | if (l != -8) { | |
101 | c2ln(in, tin0, tin1, l + 8); | |
102 | tin0 ^= tout0 ^ inW0; | |
103 | tin[0] = tin0; | |
104 | tin1 ^= tout1 ^ inW1; | |
105 | tin[1] = tin1; | |
106 | DES_encrypt1(tin, schedule, DES_ENCRYPT); | |
107 | tout0 = tin[0] ^ outW0; | |
108 | l2c(tout0, out); | |
109 | tout1 = tin[1] ^ outW1; | |
110 | l2c(tout1, out); | |
111 | } | |
112 | iv = &(*ivec)[0]; | |
113 | l2c(tout0, iv); | |
114 | l2c(tout1, iv); | |
115 | } else { | |
116 | c2l(iv, xor0); | |
117 | c2l(iv, xor1); | |
118 | for (l -= 8; l > 0; l -= 8) { | |
119 | c2l(in, tin0); | |
120 | tin[0] = tin0 ^ outW0; | |
121 | c2l(in, tin1); | |
122 | tin[1] = tin1 ^ outW1; | |
123 | DES_encrypt1(tin, schedule, DES_DECRYPT); | |
124 | tout0 = tin[0] ^ xor0 ^ inW0; | |
125 | tout1 = tin[1] ^ xor1 ^ inW1; | |
126 | l2c(tout0, out); | |
127 | l2c(tout1, out); | |
128 | xor0 = tin0; | |
129 | xor1 = tin1; | |
130 | } | |
131 | if (l != -8) { | |
132 | c2l(in, tin0); | |
133 | tin[0] = tin0 ^ outW0; | |
134 | c2l(in, tin1); | |
135 | tin[1] = tin1 ^ outW1; | |
136 | DES_encrypt1(tin, schedule, DES_DECRYPT); | |
137 | tout0 = tin[0] ^ xor0 ^ inW0; | |
138 | tout1 = tin[1] ^ xor1 ^ inW1; | |
139 | l2cn(tout0, tout1, out, l + 8); | |
140 | xor0 = tin0; | |
141 | xor1 = tin1; | |
142 | } | |
d02b48c6 | 143 | |
0f113f3e MC |
144 | iv = &(*ivec)[0]; |
145 | l2c(xor0, iv); | |
146 | l2c(xor1, iv); | |
147 | } | |
148 | tin0 = tin1 = tout0 = tout1 = xor0 = xor1 = 0; | |
149 | inW0 = inW1 = outW0 = outW1 = 0; | |
150 | tin[0] = tin[1] = 0; | |
151 | } |