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diff --git a/src/lib/libcrypto/des/cfb64ede.c b/src/lib/libcrypto/des/cfb64ede.c
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1/* $OpenBSD: cfb64ede.c,v 1.13 2024/03/29 01:47:29 joshua Exp $ */
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.
8 *
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).
15 *
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.
22 *
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 :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 *
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.
52 *
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 "des_local.h"
60
61/* The input and output encrypted as though 64bit cfb mode is being
62 * used. The extra state information to record how much of the
63 * 64bit block we have used is contained in *num;
64 */
65
66void
67DES_ede3_cfb64_encrypt(const unsigned char *in, unsigned char *out,
68 long length, DES_key_schedule *ks1,
69 DES_key_schedule *ks2, DES_key_schedule *ks3,
70 DES_cblock *ivec, int *num, int enc)
71{
72 DES_LONG v0, v1;
73 long l = length;
74 int n = *num;
75 DES_LONG ti[2];
76 unsigned char *iv, c, cc;
77
78 iv = &(*ivec)[0];
79 if (enc) {
80 while (l--) {
81 if (n == 0) {
82 c2l(iv, v0);
83 c2l(iv, v1);
84
85 ti[0] = v0;
86 ti[1] = v1;
87 DES_encrypt3(ti, ks1, ks2, ks3);
88 v0 = ti[0];
89 v1 = ti[1];
90
91 iv = &(*ivec)[0];
92 l2c(v0, iv);
93 l2c(v1, iv);
94 iv = &(*ivec)[0];
95 }
96 c = *(in++) ^ iv[n];
97 *(out++) = c;
98 iv[n] = c;
99 n = (n + 1) & 0x07;
100 }
101 } else {
102 while (l--) {
103 if (n == 0) {
104 c2l(iv, v0);
105 c2l(iv, v1);
106
107 ti[0] = v0;
108 ti[1] = v1;
109 DES_encrypt3(ti, ks1, ks2, ks3);
110 v0 = ti[0];
111 v1 = ti[1];
112
113 iv = &(*ivec)[0];
114 l2c(v0, iv);
115 l2c(v1, iv);
116 iv = &(*ivec)[0];
117 }
118 cc = *(in++);
119 c = iv[n];
120 iv[n] = cc;
121 *(out++) = c ^ cc;
122 n = (n + 1) & 0x07;
123 }
124 }
125 v0 = v1 = ti[0] = ti[1] = c = cc = 0;
126 *num = n;
127}
128LCRYPTO_ALIAS(DES_ede3_cfb64_encrypt);
129
130/* This is compatible with the single key CFB-r for DES, even thought that's
131 * not what EVP needs.
132 */
133
134void
135DES_ede3_cfb_encrypt(const unsigned char *in, unsigned char *out,
136 int numbits, long length, DES_key_schedule *ks1,
137 DES_key_schedule *ks2, DES_key_schedule *ks3,
138 DES_cblock *ivec, int enc)
139{
140 DES_LONG d0, d1, v0, v1;
141 unsigned long l = length, n = ((unsigned int)numbits + 7)/8;
142 int num = numbits, i;
143 DES_LONG ti[2];
144 unsigned char *iv;
145 unsigned char ovec[16];
146
147 if (num > 64)
148 return;
149 iv = &(*ivec)[0];
150 c2l(iv, v0);
151 c2l(iv, v1);
152 if (enc) {
153 while (l >= n) {
154 l -= n;
155 ti[0] = v0;
156 ti[1] = v1;
157 DES_encrypt3(ti, ks1, ks2, ks3);
158 c2ln(in, d0, d1, n);
159 in += n;
160 d0 ^= ti[0];
161 d1 ^= ti[1];
162 l2cn(d0, d1, out, n);
163 out += n;
164 /* 30-08-94 - eay - changed because l>>32 and
165 * l<<32 are bad under gcc :-( */
166 if (num == 32) {
167 v0 = v1;
168 v1 = d0;
169 } else if (num == 64) {
170 v0 = d0;
171 v1 = d1;
172 } else {
173 iv = &ovec[0];
174 l2c(v0, iv);
175 l2c(v1, iv);
176 l2c(d0, iv);
177 l2c(d1, iv);
178 /* shift ovec left most of the bits... */
179 memmove(ovec, ovec + num/8,
180 8 + (num % 8 ? 1 : 0));
181 /* now the remaining bits */
182 if (num % 8 != 0) {
183 for (i = 0; i < 8; ++i) {
184 ovec[i] <<= num % 8;
185 ovec[i] |= ovec[i + 1] >>
186 (8 - num % 8);
187 }
188 }
189 iv = &ovec[0];
190 c2l(iv, v0);
191 c2l(iv, v1);
192 }
193 }
194 } else {
195 while (l >= n) {
196 l -= n;
197 ti[0] = v0;
198 ti[1] = v1;
199 DES_encrypt3(ti, ks1, ks2, ks3);
200 c2ln(in, d0, d1, n);
201 in += n;
202 /* 30-08-94 - eay - changed because l>>32 and
203 * l<<32 are bad under gcc :-( */
204 if (num == 32) {
205 v0 = v1;
206 v1 = d0;
207 } else if (num == 64) {
208 v0 = d0;
209 v1 = d1;
210 } else {
211 iv = &ovec[0];
212 l2c(v0, iv);
213 l2c(v1, iv);
214 l2c(d0, iv);
215 l2c(d1, iv);
216 /* shift ovec left most of the bits... */
217 memmove(ovec, ovec + num/8,
218 8 + (num % 8 ? 1 : 0));
219 /* now the remaining bits */
220 if (num % 8 != 0) {
221 for (i = 0; i < 8; ++i) {
222 ovec[i] <<= num % 8;
223 ovec[i] |= ovec[i + 1] >>
224 (8 - num % 8);
225 }
226 }
227 iv = &ovec[0];
228 c2l(iv, v0);
229 c2l(iv, v1);
230 }
231 d0 ^= ti[0];
232 d1 ^= ti[1];
233 l2cn(d0, d1, out, n);
234 out += n;
235 }
236 }
237 iv = &(*ivec)[0];
238 l2c(v0, iv);
239 l2c(v1, iv);
240 v0 = v1 = d0 = d1 = ti[0] = ti[1] = 0;
241}
242LCRYPTO_ALIAS(DES_ede3_cfb_encrypt);
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2025-08-19 21:04:24 +0000