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1/* $OpenBSD: e_des.c,v 1.24 2024/04/09 13:52:41 beck 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 <limits.h>
60#include <stdio.h>
61
62#include <openssl/opensslconf.h>
63
64#ifndef OPENSSL_NO_DES
65
66#include <openssl/evp.h>
67#include <openssl/des.h>
68#include <openssl/objects.h>
69
70#include "evp_local.h"
71
72static int
73des_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
74 const unsigned char *iv, int enc)
75{
76 DES_cblock *deskey = (DES_cblock *)key;
77
78 DES_set_key_unchecked(deskey, ctx->cipher_data);
79 return 1;
80}
81
82static int
83des_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr)
84{
85 switch (type) {
86 case EVP_CTRL_RAND_KEY:
87 if (DES_random_key((DES_cblock *)ptr) == 0)
88 return 0;
89 return 1;
90
91 default:
92 return -1;
93 }
94}
95
96static int
97des_ecb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
98 const unsigned char *in, size_t inl)
99{
100 size_t i, bl;
101
102 bl = ctx->cipher->block_size;
103
104 if (inl < bl)
105 return 1;
106
107 inl -= bl;
108
109 for (i = 0; i <= inl; i += bl)
110 DES_ecb_encrypt((DES_cblock *)(in + i), (DES_cblock *)(out + i),
111 ctx->cipher_data, ctx->encrypt);
112
113 return 1;
114}
115
116static int
117des_ofb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
118 const unsigned char *in, size_t inl)
119{
120 size_t chunk = LONG_MAX & ~0xff;
121
122 while (inl >= chunk) {
123 DES_ofb64_encrypt(in, out, (long)chunk, ctx->cipher_data,
124 (DES_cblock *)ctx->iv, &ctx->num);
125 inl -= chunk;
126 in += chunk;
127 out += chunk;
128 }
129 if (inl)
130 DES_ofb64_encrypt(in, out, (long)inl, ctx->cipher_data,
131 (DES_cblock *)ctx->iv, &ctx->num);
132 return 1;
133}
134
135static int
136des_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
137 const unsigned char *in, size_t inl)
138{
139 size_t chunk = LONG_MAX & ~0xff;
140
141 while (inl >= chunk) {
142 DES_ncbc_encrypt(in, out, (long)chunk, ctx->cipher_data,
143 (DES_cblock *)ctx->iv, ctx->encrypt);
144 inl -= chunk;
145 in += chunk;
146 out += chunk;
147 }
148 if (inl)
149 DES_ncbc_encrypt(in, out, (long)inl, ctx->cipher_data,
150 (DES_cblock *)ctx->iv, ctx->encrypt);
151 return 1;
152}
153
154static int
155des_cfb64_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
156 const unsigned char *in, size_t inl)
157{
158 size_t chunk = LONG_MAX & ~0xff;
159
160 while (inl >= chunk) {
161 DES_cfb64_encrypt(in, out, (long)chunk, ctx->cipher_data,
162 (DES_cblock *)ctx->iv, &ctx->num, ctx->encrypt);
163 inl -= chunk;
164 in += chunk;
165 out += chunk;
166 }
167 if (inl)
168 DES_cfb64_encrypt(in, out, (long)inl, ctx->cipher_data,
169 (DES_cblock *)ctx->iv, &ctx->num, ctx->encrypt);
170 return 1;
171}
172
173/* Although we have a CFB-r implementation for DES, it doesn't pack the right
174 way, so wrap it here */
175static int
176des_cfb1_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
177 const unsigned char *in, size_t inl)
178{
179 unsigned char c[1], d[1];
180 size_t chunk = LONG_MAX / 8;
181 size_t n;
182
183 if (inl < chunk)
184 chunk = inl;
185
186 while (inl && inl >= chunk) {
187 for (n = 0; n < chunk*8; ++n) {
188 c[0] = (in[n / 8] & (1 << (7 - n % 8))) ? 0x80 : 0;
189 DES_cfb_encrypt(c, d, 1, 1, ctx->cipher_data,
190 (DES_cblock *)ctx->iv, ctx->encrypt);
191 out[n / 8] = (out[n / 8] &
192 ~(0x80 >> (unsigned int)(n % 8))) |
193 ((d[0] & 0x80) >> (unsigned int)(n % 8));
194 }
195 inl -= chunk;
196 in += chunk;
197 out += chunk;
198 if (inl < chunk)
199 chunk = inl;
200 }
201
202 return 1;
203}
204
205static int
206des_cfb8_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
207 const unsigned char *in, size_t inl)
208{
209 size_t chunk = LONG_MAX & ~0xff;
210
211 while (inl >= chunk) {
212 DES_cfb_encrypt(in, out, 8, (long)chunk,
213 ctx->cipher_data, (DES_cblock *)ctx->iv, ctx->encrypt);
214 inl -= chunk;
215 in += chunk;
216 out += chunk;
217 }
218 if (inl)
219 DES_cfb_encrypt(in, out, 8, (long)inl, ctx->cipher_data,
220 (DES_cblock *)ctx->iv, ctx->encrypt);
221 return 1;
222}
223
224static const EVP_CIPHER des_cbc = {
225 .nid = NID_des_cbc,
226 .block_size = 8,
227 .key_len = 8,
228 .iv_len = 8,
229 .flags = EVP_CIPH_RAND_KEY | EVP_CIPH_CBC_MODE,
230 .init = des_init_key,
231 .do_cipher = des_cbc_cipher,
232 .cleanup = NULL,
233 .ctx_size = sizeof(DES_key_schedule),
234 .set_asn1_parameters = EVP_CIPHER_set_asn1_iv,
235 .get_asn1_parameters = EVP_CIPHER_get_asn1_iv,
236 .ctrl = des_ctrl,
237};
238
239const EVP_CIPHER *
240EVP_des_cbc(void)
241{
242 return &des_cbc;
243}
244LCRYPTO_ALIAS(EVP_des_cbc);
245
246static const EVP_CIPHER des_cfb64 = {
247 .nid = NID_des_cfb64,
248 .block_size = 1,
249 .key_len = 8,
250 .iv_len = 8,
251 .flags = EVP_CIPH_RAND_KEY | EVP_CIPH_CFB_MODE,
252 .init = des_init_key,
253 .do_cipher = des_cfb64_cipher,
254 .cleanup = NULL,
255 .ctx_size = sizeof(DES_key_schedule),
256 .set_asn1_parameters = EVP_CIPHER_set_asn1_iv,
257 .get_asn1_parameters = EVP_CIPHER_get_asn1_iv,
258 .ctrl = des_ctrl,
259};
260
261const EVP_CIPHER *
262EVP_des_cfb64(void)
263{
264 return &des_cfb64;
265}
266LCRYPTO_ALIAS(EVP_des_cfb64);
267
268static const EVP_CIPHER des_ofb = {
269 .nid = NID_des_ofb64,
270 .block_size = 1,
271 .key_len = 8,
272 .iv_len = 8,
273 .flags = EVP_CIPH_RAND_KEY | EVP_CIPH_OFB_MODE,
274 .init = des_init_key,
275 .do_cipher = des_ofb_cipher,
276 .cleanup = NULL,
277 .ctx_size = sizeof(DES_key_schedule),
278 .set_asn1_parameters = EVP_CIPHER_set_asn1_iv,
279 .get_asn1_parameters = EVP_CIPHER_get_asn1_iv,
280 .ctrl = des_ctrl,
281};
282
283const EVP_CIPHER *
284EVP_des_ofb(void)
285{
286 return &des_ofb;
287}
288LCRYPTO_ALIAS(EVP_des_ofb);
289
290static const EVP_CIPHER des_ecb = {
291 .nid = NID_des_ecb,
292 .block_size = 8,
293 .key_len = 8,
294 .iv_len = 0,
295 .flags = EVP_CIPH_RAND_KEY | EVP_CIPH_ECB_MODE,
296 .init = des_init_key,
297 .do_cipher = des_ecb_cipher,
298 .cleanup = NULL,
299 .ctx_size = sizeof(DES_key_schedule),
300 .set_asn1_parameters = EVP_CIPHER_set_asn1_iv,
301 .get_asn1_parameters = EVP_CIPHER_get_asn1_iv,
302 .ctrl = des_ctrl,
303};
304
305const EVP_CIPHER *
306EVP_des_ecb(void)
307{
308 return &des_ecb;
309}
310LCRYPTO_ALIAS(EVP_des_ecb);
311
312static const EVP_CIPHER des_cfb1 = {
313 .nid = NID_des_cfb1,
314 .block_size = 1,
315 .key_len = 8,
316 .iv_len = 8,
317 .flags = EVP_CIPH_RAND_KEY | EVP_CIPH_CFB_MODE,
318 .init = des_init_key,
319 .do_cipher = des_cfb1_cipher,
320 .cleanup = NULL,
321 .ctx_size = sizeof(DES_key_schedule),
322 .set_asn1_parameters = EVP_CIPHER_set_asn1_iv,
323 .get_asn1_parameters = EVP_CIPHER_get_asn1_iv,
324 .ctrl = des_ctrl,
325};
326
327const EVP_CIPHER *
328EVP_des_cfb1(void)
329{
330 return &des_cfb1;
331}
332LCRYPTO_ALIAS(EVP_des_cfb1);
333
334static const EVP_CIPHER des_cfb8 = {
335 .nid = NID_des_cfb8,
336 .block_size = 1,
337 .key_len = 8,
338 .iv_len = 8,
339 .flags = EVP_CIPH_RAND_KEY | EVP_CIPH_CFB_MODE,
340 .init = des_init_key,
341 .do_cipher = des_cfb8_cipher,
342 .cleanup = NULL,
343 .ctx_size = sizeof(DES_key_schedule),
344 .set_asn1_parameters = EVP_CIPHER_set_asn1_iv,
345 .get_asn1_parameters = EVP_CIPHER_get_asn1_iv,
346 .ctrl = des_ctrl,
347};
348
349const EVP_CIPHER *
350EVP_des_cfb8(void)
351{
352 return &des_cfb8;
353}
354LCRYPTO_ALIAS(EVP_des_cfb8);
355#endif
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