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58964a49 RE |
1 | /* crypto/rc5/rc5_enc.c */ |
2 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) | |
3 | * All rights reserved. | |
4 | * | |
5 | * This package is an SSL implementation written | |
6 | * by Eric Young (eay@cryptsoft.com). | |
7 | * The implementation was written so as to conform with Netscapes SSL. | |
40720ce3 | 8 | * |
58964a49 RE |
9 | * This library is free for commercial and non-commercial use as long as |
10 | * the following conditions are aheared to. The following conditions | |
11 | * apply to all code found in this distribution, be it the RC4, RSA, | |
12 | * lhash, DES, etc., code; not just the SSL code. The SSL documentation | |
13 | * included with this distribution is covered by the same copyright terms | |
14 | * except that the holder is Tim Hudson (tjh@cryptsoft.com). | |
40720ce3 | 15 | * |
58964a49 RE |
16 | * Copyright remains Eric Young's, and as such any Copyright notices in |
17 | * the code are not to be removed. | |
18 | * If this package is used in a product, Eric Young should be given attribution | |
19 | * as the author of the parts of the library used. | |
20 | * This can be in the form of a textual message at program startup or | |
21 | * in documentation (online or textual) provided with the package. | |
40720ce3 | 22 | * |
58964a49 RE |
23 | * Redistribution and use in source and binary forms, with or without |
24 | * modification, are permitted provided that the following conditions | |
25 | * are met: | |
26 | * 1. Redistributions of source code must retain the copyright | |
27 | * notice, this list of conditions and the following disclaimer. | |
28 | * 2. Redistributions in binary form must reproduce the above copyright | |
29 | * notice, this list of conditions and the following disclaimer in the | |
30 | * documentation and/or other materials provided with the distribution. | |
31 | * 3. All advertising materials mentioning features or use of this software | |
32 | * must display the following acknowledgement: | |
33 | * "This product includes cryptographic software written by | |
34 | * Eric Young (eay@cryptsoft.com)" | |
35 | * The word 'cryptographic' can be left out if the rouines from the library | |
36 | * being used are not cryptographic related :-). | |
40720ce3 | 37 | * 4. If you include any Windows specific code (or a derivative thereof) from |
58964a49 RE |
38 | * the apps directory (application code) you must include an acknowledgement: |
39 | * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" | |
40720ce3 | 40 | * |
58964a49 RE |
41 | * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND |
42 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
43 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
44 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE | |
45 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
46 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
47 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
48 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
49 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
50 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
51 | * SUCH DAMAGE. | |
40720ce3 | 52 | * |
58964a49 RE |
53 | * The licence and distribution terms for any publically available version or |
54 | * derivative of this code cannot be changed. i.e. this code cannot simply be | |
55 | * copied and put under another distribution licence | |
56 | * [including the GNU Public Licence.] | |
57 | */ | |
58 | ||
59 | #include <stdio.h> | |
ec577822 | 60 | #include <openssl/rc5.h> |
58964a49 RE |
61 | #include "rc5_locl.h" |
62 | ||
1921eaad | 63 | void RC5_32_cbc_encrypt(const unsigned char *in, unsigned char *out, |
40720ce3 MC |
64 | long length, RC5_32_KEY *ks, unsigned char *iv, |
65 | int encrypt) | |
66 | { | |
67 | register unsigned long tin0, tin1; | |
68 | register unsigned long tout0, tout1, xor0, xor1; | |
69 | register long l = length; | |
70 | unsigned long tin[2]; | |
58964a49 | 71 | |
40720ce3 MC |
72 | if (encrypt) { |
73 | c2l(iv, tout0); | |
74 | c2l(iv, tout1); | |
75 | iv -= 8; | |
76 | for (l -= 8; l >= 0; l -= 8) { | |
77 | c2l(in, tin0); | |
78 | c2l(in, tin1); | |
79 | tin0 ^= tout0; | |
80 | tin1 ^= tout1; | |
81 | tin[0] = tin0; | |
82 | tin[1] = tin1; | |
83 | RC5_32_encrypt(tin, ks); | |
84 | tout0 = tin[0]; | |
85 | l2c(tout0, out); | |
86 | tout1 = tin[1]; | |
87 | l2c(tout1, out); | |
88 | } | |
89 | if (l != -8) { | |
90 | c2ln(in, tin0, tin1, l + 8); | |
91 | tin0 ^= tout0; | |
92 | tin1 ^= tout1; | |
93 | tin[0] = tin0; | |
94 | tin[1] = tin1; | |
95 | RC5_32_encrypt(tin, ks); | |
96 | tout0 = tin[0]; | |
97 | l2c(tout0, out); | |
98 | tout1 = tin[1]; | |
99 | l2c(tout1, out); | |
100 | } | |
101 | l2c(tout0, iv); | |
102 | l2c(tout1, iv); | |
103 | } else { | |
104 | c2l(iv, xor0); | |
105 | c2l(iv, xor1); | |
106 | iv -= 8; | |
107 | for (l -= 8; l >= 0; l -= 8) { | |
108 | c2l(in, tin0); | |
109 | tin[0] = tin0; | |
110 | c2l(in, tin1); | |
111 | tin[1] = tin1; | |
112 | RC5_32_decrypt(tin, ks); | |
113 | tout0 = tin[0] ^ xor0; | |
114 | tout1 = tin[1] ^ xor1; | |
115 | l2c(tout0, out); | |
116 | l2c(tout1, out); | |
117 | xor0 = tin0; | |
118 | xor1 = tin1; | |
119 | } | |
120 | if (l != -8) { | |
121 | c2l(in, tin0); | |
122 | tin[0] = tin0; | |
123 | c2l(in, tin1); | |
124 | tin[1] = tin1; | |
125 | RC5_32_decrypt(tin, ks); | |
126 | tout0 = tin[0] ^ xor0; | |
127 | tout1 = tin[1] ^ xor1; | |
128 | l2cn(tout0, tout1, out, l + 8); | |
129 | xor0 = tin0; | |
130 | xor1 = tin1; | |
131 | } | |
132 | l2c(xor0, iv); | |
133 | l2c(xor1, iv); | |
134 | } | |
135 | tin0 = tin1 = tout0 = tout1 = xor0 = xor1 = 0; | |
136 | tin[0] = tin[1] = 0; | |
137 | } | |
58964a49 | 138 | |
6b691a5c | 139 | void RC5_32_encrypt(unsigned long *d, RC5_32_KEY *key) |
40720ce3 MC |
140 | { |
141 | RC5_32_INT a, b, *s; | |
58964a49 | 142 | |
40720ce3 | 143 | s = key->data; |
58964a49 | 144 | |
40720ce3 MC |
145 | a = d[0] + s[0]; |
146 | b = d[1] + s[1]; | |
147 | E_RC5_32(a, b, s, 2); | |
148 | E_RC5_32(a, b, s, 4); | |
149 | E_RC5_32(a, b, s, 6); | |
150 | E_RC5_32(a, b, s, 8); | |
151 | E_RC5_32(a, b, s, 10); | |
152 | E_RC5_32(a, b, s, 12); | |
153 | E_RC5_32(a, b, s, 14); | |
154 | E_RC5_32(a, b, s, 16); | |
155 | if (key->rounds == 12) { | |
156 | E_RC5_32(a, b, s, 18); | |
157 | E_RC5_32(a, b, s, 20); | |
158 | E_RC5_32(a, b, s, 22); | |
159 | E_RC5_32(a, b, s, 24); | |
160 | } else if (key->rounds == 16) { | |
161 | /* Do a full expansion to avoid a jump */ | |
162 | E_RC5_32(a, b, s, 18); | |
163 | E_RC5_32(a, b, s, 20); | |
164 | E_RC5_32(a, b, s, 22); | |
165 | E_RC5_32(a, b, s, 24); | |
166 | E_RC5_32(a, b, s, 26); | |
167 | E_RC5_32(a, b, s, 28); | |
168 | E_RC5_32(a, b, s, 30); | |
169 | E_RC5_32(a, b, s, 32); | |
170 | } | |
171 | d[0] = a; | |
172 | d[1] = b; | |
173 | } | |
58964a49 | 174 | |
6b691a5c | 175 | void RC5_32_decrypt(unsigned long *d, RC5_32_KEY *key) |
40720ce3 MC |
176 | { |
177 | RC5_32_INT a, b, *s; | |
58964a49 | 178 | |
40720ce3 | 179 | s = key->data; |
58964a49 | 180 | |
40720ce3 MC |
181 | a = d[0]; |
182 | b = d[1]; | |
183 | if (key->rounds == 16) { | |
184 | D_RC5_32(a, b, s, 32); | |
185 | D_RC5_32(a, b, s, 30); | |
186 | D_RC5_32(a, b, s, 28); | |
187 | D_RC5_32(a, b, s, 26); | |
188 | /* Do a full expansion to avoid a jump */ | |
189 | D_RC5_32(a, b, s, 24); | |
190 | D_RC5_32(a, b, s, 22); | |
191 | D_RC5_32(a, b, s, 20); | |
192 | D_RC5_32(a, b, s, 18); | |
193 | } else if (key->rounds == 12) { | |
194 | D_RC5_32(a, b, s, 24); | |
195 | D_RC5_32(a, b, s, 22); | |
196 | D_RC5_32(a, b, s, 20); | |
197 | D_RC5_32(a, b, s, 18); | |
198 | } | |
199 | D_RC5_32(a, b, s, 16); | |
200 | D_RC5_32(a, b, s, 14); | |
201 | D_RC5_32(a, b, s, 12); | |
202 | D_RC5_32(a, b, s, 10); | |
203 | D_RC5_32(a, b, s, 8); | |
204 | D_RC5_32(a, b, s, 6); | |
205 | D_RC5_32(a, b, s, 4); | |
206 | D_RC5_32(a, b, s, 2); | |
207 | d[0] = a - s[0]; | |
208 | d[1] = b - s[1]; | |
209 | } |