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
356