e_cast.c revision 1.9 
1/* $OpenBSD: e_cast.c,v 1.9 2022/09/04 13:17:18 jsing 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 <stdio.h>
60
61#include <openssl/opensslconf.h>
62
63#ifndef OPENSSL_NO_CAST
64
65#include <openssl/cast.h>
66#include <openssl/evp.h>
67#include <openssl/objects.h>
68
69#include "evp_locl.h"
70
71typedef struct {
72	CAST_KEY ks;
73} EVP_CAST_KEY;
74
75#define data(ctx)	((EVP_CAST_KEY *)(ctx)->cipher_data)
76
77static int
78cast_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
79    const unsigned char *iv, int enc)
80{
81	CAST_set_key(&data(ctx)->ks, EVP_CIPHER_CTX_key_length(ctx), key);
82	return 1;
83}
84
85static int
86cast5_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, const unsigned char *in, size_t inl)
87{
88	while (inl >= EVP_MAXCHUNK) {
89		CAST_cbc_encrypt(in, out, (long)EVP_MAXCHUNK, &((EVP_CAST_KEY *)ctx->cipher_data)->ks, ctx->iv, ctx->encrypt);
90		inl -= EVP_MAXCHUNK;
91		in += EVP_MAXCHUNK;
92		out += EVP_MAXCHUNK;
93	}
94
95	if (inl)
96		CAST_cbc_encrypt(in, out, (long)inl, &((EVP_CAST_KEY *)ctx->cipher_data)->ks, ctx->iv, ctx->encrypt);
97
98	return 1;
99}
100
101static int
102cast5_cfb64_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, const unsigned char *in, size_t inl)
103{
104	size_t chunk = EVP_MAXCHUNK;
105
106	if (64 == 1)
107		chunk >>= 3;
108
109	if (inl < chunk)
110		chunk = inl;
111
112	while (inl && inl >= chunk) {
113		CAST_cfb64_encrypt(in, out, (long)((64 == 1) && !(ctx->flags & EVP_CIPH_FLAG_LENGTH_BITS) ? inl * 8 : inl), &((EVP_CAST_KEY *)ctx->cipher_data)->ks, ctx->iv, &ctx->num, ctx->encrypt);
114		inl -= chunk;
115		in += chunk;
116		out += chunk;
117		if (inl < chunk)
118			chunk = inl;
119	}
120
121	return 1;
122}
123
124static int
125cast5_ecb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, const unsigned char *in, size_t inl)
126{
127	size_t i, bl;
128
129	bl = ctx->cipher->block_size;
130
131	if (inl < bl)
132		return 1;
133
134	inl -= bl;
135
136	for (i = 0; i <= inl; i += bl)
137		CAST_ecb_encrypt(in + i, out + i, &((EVP_CAST_KEY *)ctx->cipher_data)->ks, ctx->encrypt);
138
139	return 1;
140}
141
142static int
143cast5_ofb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, const unsigned char *in, size_t inl)
144{
145	while (inl >= EVP_MAXCHUNK) {
146		CAST_ofb64_encrypt(in, out, (long)EVP_MAXCHUNK, &((EVP_CAST_KEY *)ctx->cipher_data)->ks, ctx->iv, &ctx->num);
147		inl -= EVP_MAXCHUNK;
148		in += EVP_MAXCHUNK;
149		out += EVP_MAXCHUNK;
150	}
151
152	if (inl)
153		CAST_ofb64_encrypt(in, out, (long)inl, &((EVP_CAST_KEY *)ctx->cipher_data)->ks, ctx->iv, &ctx->num);
154
155	return 1;
156}
157
158static const EVP_CIPHER cast5_cbc = {
159	.nid = NID_cast5_cbc,
160	.block_size = 8,
161	.key_len = CAST_KEY_LENGTH,
162	.iv_len = 8,
163	.flags = EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CBC_MODE,
164	.init = cast_init_key,
165	.do_cipher = cast5_cbc_cipher,
166	.cleanup = NULL,
167	.ctx_size = sizeof(EVP_CAST_KEY),
168	.set_asn1_parameters = EVP_CIPHER_set_asn1_iv,
169	.get_asn1_parameters = EVP_CIPHER_get_asn1_iv,
170	.ctrl = NULL,
171	.app_data = NULL,
172};
173
174const EVP_CIPHER *
175EVP_cast5_cbc(void)
176{
177	return &cast5_cbc;
178}
179
180static const EVP_CIPHER cast5_cfb64 = {
181	.nid = NID_cast5_cfb64,
182	.block_size = 1,
183	.key_len = CAST_KEY_LENGTH,
184	.iv_len = 8,
185	.flags = EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CFB_MODE,
186	.init = cast_init_key,
187	.do_cipher = cast5_cfb64_cipher,
188	.cleanup = NULL,
189	.ctx_size = sizeof(EVP_CAST_KEY),
190	.set_asn1_parameters = EVP_CIPHER_set_asn1_iv,
191	.get_asn1_parameters = EVP_CIPHER_get_asn1_iv,
192	.ctrl = NULL,
193	.app_data = NULL,
194};
195
196const EVP_CIPHER *
197EVP_cast5_cfb64(void)
198{
199	return &cast5_cfb64;
200}
201
202static const EVP_CIPHER cast5_ofb = {
203	.nid = NID_cast5_ofb64,
204	.block_size = 1,
205	.key_len = CAST_KEY_LENGTH,
206	.iv_len = 8,
207	.flags = EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_OFB_MODE,
208	.init = cast_init_key,
209	.do_cipher = cast5_ofb_cipher,
210	.cleanup = NULL,
211	.ctx_size = sizeof(EVP_CAST_KEY),
212	.set_asn1_parameters = EVP_CIPHER_set_asn1_iv,
213	.get_asn1_parameters = EVP_CIPHER_get_asn1_iv,
214	.ctrl = NULL,
215	.app_data = NULL,
216};
217
218const EVP_CIPHER *
219EVP_cast5_ofb(void)
220{
221	return &cast5_ofb;
222}
223
224static const EVP_CIPHER cast5_ecb = {
225	.nid = NID_cast5_ecb,
226	.block_size = 8,
227	.key_len = CAST_KEY_LENGTH,
228	.iv_len = 0,
229	.flags = EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_ECB_MODE,
230	.init = cast_init_key,
231	.do_cipher = cast5_ecb_cipher,
232	.cleanup = NULL,
233	.ctx_size = sizeof(EVP_CAST_KEY),
234	.set_asn1_parameters = EVP_CIPHER_set_asn1_iv,
235	.get_asn1_parameters = EVP_CIPHER_get_asn1_iv,
236	.ctrl = NULL,
237	.app_data = NULL,
238};
239
240const EVP_CIPHER *
241EVP_cast5_ecb(void)
242{
243	return &cast5_ecb;
244}
245#endif
246