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1d97c843 | 1 | /*- |
82dccbd7 | 2 | * #included by: |
c2e4f17c RL |
3 | * cbc_enc.c (DES_cbc_encrypt) |
4 | * des_enc.c (DES_ncbc_encrypt) | |
82dccbd7 | 5 | */ |
58964a49 | 6 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
d02b48c6 RE |
7 | * All rights reserved. |
8 | * | |
9 | * This package is an SSL implementation written | |
10 | * by Eric Young (eay@cryptsoft.com). | |
11 | * The implementation was written so as to conform with Netscapes SSL. | |
0f113f3e | 12 | * |
d02b48c6 RE |
13 | * This library is free for commercial and non-commercial use as long as |
14 | * the following conditions are aheared to. The following conditions | |
15 | * apply to all code found in this distribution, be it the RC4, RSA, | |
16 | * lhash, DES, etc., code; not just the SSL code. The SSL documentation | |
17 | * included with this distribution is covered by the same copyright terms | |
18 | * except that the holder is Tim Hudson (tjh@cryptsoft.com). | |
0f113f3e | 19 | * |
d02b48c6 RE |
20 | * Copyright remains Eric Young's, and as such any Copyright notices in |
21 | * the code are not to be removed. | |
22 | * If this package is used in a product, Eric Young should be given attribution | |
23 | * as the author of the parts of the library used. | |
24 | * This can be in the form of a textual message at program startup or | |
25 | * in documentation (online or textual) provided with the package. | |
0f113f3e | 26 | * |
d02b48c6 RE |
27 | * Redistribution and use in source and binary forms, with or without |
28 | * modification, are permitted provided that the following conditions | |
29 | * are met: | |
30 | * 1. Redistributions of source code must retain the copyright | |
31 | * notice, this list of conditions and the following disclaimer. | |
32 | * 2. Redistributions in binary form must reproduce the above copyright | |
33 | * notice, this list of conditions and the following disclaimer in the | |
34 | * documentation and/or other materials provided with the distribution. | |
35 | * 3. All advertising materials mentioning features or use of this software | |
36 | * must display the following acknowledgement: | |
37 | * "This product includes cryptographic software written by | |
38 | * Eric Young (eay@cryptsoft.com)" | |
39 | * The word 'cryptographic' can be left out if the rouines from the library | |
40 | * being used are not cryptographic related :-). | |
0f113f3e | 41 | * 4. If you include any Windows specific code (or a derivative thereof) from |
d02b48c6 RE |
42 | * the apps directory (application code) you must include an acknowledgement: |
43 | * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" | |
0f113f3e | 44 | * |
d02b48c6 RE |
45 | * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND |
46 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
47 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
48 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE | |
49 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
50 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
51 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
52 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
53 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
54 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
55 | * SUCH DAMAGE. | |
0f113f3e | 56 | * |
d02b48c6 RE |
57 | * The licence and distribution terms for any publically available version or |
58 | * derivative of this code cannot be changed. i.e. this code cannot simply be | |
59 | * copied and put under another distribution licence | |
60 | * [including the GNU Public Licence.] | |
61 | */ | |
62 | ||
63 | #include "des_locl.h" | |
64 | ||
3bcfce28 | 65 | #ifdef CBC_ENC_C__DONT_UPDATE_IV |
c2e4f17c | 66 | void DES_cbc_encrypt(const unsigned char *in, unsigned char *out, long length, |
0f113f3e | 67 | DES_key_schedule *_schedule, DES_cblock *ivec, int enc) |
3bcfce28 | 68 | #else |
0f113f3e MC |
69 | void DES_ncbc_encrypt(const unsigned char *in, unsigned char *out, |
70 | long length, DES_key_schedule *_schedule, | |
71 | DES_cblock *ivec, int enc) | |
3bcfce28 | 72 | #endif |
0f113f3e MC |
73 | { |
74 | register DES_LONG tin0, tin1; | |
75 | register DES_LONG tout0, tout1, xor0, xor1; | |
76 | register long l = length; | |
77 | DES_LONG tin[2]; | |
78 | unsigned char *iv; | |
d02b48c6 | 79 | |
0f113f3e | 80 | iv = &(*ivec)[0]; |
d02b48c6 | 81 | |
0f113f3e MC |
82 | if (enc) { |
83 | c2l(iv, tout0); | |
84 | c2l(iv, tout1); | |
85 | for (l -= 8; l >= 0; l -= 8) { | |
86 | c2l(in, tin0); | |
87 | c2l(in, tin1); | |
88 | tin0 ^= tout0; | |
89 | tin[0] = tin0; | |
90 | tin1 ^= tout1; | |
91 | tin[1] = tin1; | |
92 | DES_encrypt1((DES_LONG *)tin, _schedule, DES_ENCRYPT); | |
93 | tout0 = tin[0]; | |
94 | l2c(tout0, out); | |
95 | tout1 = tin[1]; | |
96 | l2c(tout1, out); | |
97 | } | |
98 | if (l != -8) { | |
99 | c2ln(in, tin0, tin1, l + 8); | |
100 | tin0 ^= tout0; | |
101 | tin[0] = tin0; | |
102 | tin1 ^= tout1; | |
103 | tin[1] = tin1; | |
104 | DES_encrypt1((DES_LONG *)tin, _schedule, DES_ENCRYPT); | |
105 | tout0 = tin[0]; | |
106 | l2c(tout0, out); | |
107 | tout1 = tin[1]; | |
108 | l2c(tout1, out); | |
109 | } | |
3bcfce28 | 110 | #ifndef CBC_ENC_C__DONT_UPDATE_IV |
0f113f3e MC |
111 | iv = &(*ivec)[0]; |
112 | l2c(tout0, iv); | |
113 | l2c(tout1, iv); | |
3bcfce28 | 114 | #endif |
0f113f3e MC |
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; | |
121 | c2l(in, tin1); | |
122 | tin[1] = tin1; | |
123 | DES_encrypt1((DES_LONG *)tin, _schedule, DES_DECRYPT); | |
124 | tout0 = tin[0] ^ xor0; | |
125 | tout1 = tin[1] ^ xor1; | |
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; | |
134 | c2l(in, tin1); | |
135 | tin[1] = tin1; | |
136 | DES_encrypt1((DES_LONG *)tin, _schedule, DES_DECRYPT); | |
137 | tout0 = tin[0] ^ xor0; | |
138 | tout1 = tin[1] ^ xor1; | |
139 | l2cn(tout0, tout1, out, l + 8); | |
3bcfce28 | 140 | #ifndef CBC_ENC_C__DONT_UPDATE_IV |
0f113f3e MC |
141 | xor0 = tin0; |
142 | xor1 = tin1; | |
3bcfce28 | 143 | #endif |
0f113f3e MC |
144 | } |
145 | #ifndef CBC_ENC_C__DONT_UPDATE_IV | |
146 | iv = &(*ivec)[0]; | |
147 | l2c(xor0, iv); | |
148 | l2c(xor1, iv); | |
3bcfce28 | 149 | #endif |
0f113f3e MC |
150 | } |
151 | tin0 = tin1 = tout0 = tout1 = xor0 = xor1 = 0; | |
152 | tin[0] = tin[1] = 0; | |
153 | } |