1 /* $OpenBSD: e_cast.c,v 1.13 2022/09/15 07:04:19 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 <limits.h>
60 #include <stdio.h>
61
62 #include <openssl/opensslconf.h>
63
64 #ifndef OPENSSL_NO_CAST
65
66 #include <openssl/cast.h>
67 #include <openssl/evp.h>
68 #include <openssl/objects.h>
69
70 #include "evp_locl.h"
71
72 typedef struct {
73 CAST_KEY ks;
74 } EVP_CAST_KEY;
75
76 #define data(ctx) ((EVP_CAST_KEY *)(ctx)->cipher_data)
77
78 static int
cast_init_key(EVP_CIPHER_CTX * ctx,const unsigned char * key,const unsigned char * iv,int enc)79 cast_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
80 const unsigned char *iv, int enc)
81 {
82 CAST_set_key(&data(ctx)->ks, EVP_CIPHER_CTX_key_length(ctx), key);
83 return 1;
84 }
85
86 static int
cast5_cbc_cipher(EVP_CIPHER_CTX * ctx,unsigned char * out,const unsigned char * in,size_t inl)87 cast5_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, const unsigned char *in, size_t inl)
88 {
89 size_t chunk = LONG_MAX & ~0xff;
90
91 while (inl >= chunk) {
92 CAST_cbc_encrypt(in, out, (long)chunk, &((EVP_CAST_KEY *)ctx->cipher_data)->ks, ctx->iv, ctx->encrypt);
93 inl -= chunk;
94 in += chunk;
95 out += chunk;
96 }
97
98 if (inl)
99 CAST_cbc_encrypt(in, out, (long)inl, &((EVP_CAST_KEY *)ctx->cipher_data)->ks, ctx->iv, ctx->encrypt);
100
101 return 1;
102 }
103
104 static int
cast5_cfb64_cipher(EVP_CIPHER_CTX * ctx,unsigned char * out,const unsigned char * in,size_t inl)105 cast5_cfb64_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, const unsigned char *in, size_t inl)
106 {
107 size_t chunk = LONG_MAX & ~0xff;
108
109 if (inl < chunk)
110 chunk = inl;
111
112 while (inl && inl >= chunk) {
113 CAST_cfb64_encrypt(in, out, (long)chunk, &((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
124 static int
cast5_ecb_cipher(EVP_CIPHER_CTX * ctx,unsigned char * out,const unsigned char * in,size_t inl)125 cast5_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
142 static int
cast5_ofb_cipher(EVP_CIPHER_CTX * ctx,unsigned char * out,const unsigned char * in,size_t inl)143 cast5_ofb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, const unsigned char *in, size_t inl)
144 {
145 size_t chunk = LONG_MAX & ~0xff;
146
147 while (inl >= chunk) {
148 CAST_ofb64_encrypt(in, out, (long)chunk, &((EVP_CAST_KEY *)ctx->cipher_data)->ks, ctx->iv, &ctx->num);
149 inl -= chunk;
150 in += chunk;
151 out += chunk;
152 }
153
154 if (inl)
155 CAST_ofb64_encrypt(in, out, (long)inl, &((EVP_CAST_KEY *)ctx->cipher_data)->ks, ctx->iv, &ctx->num);
156
157 return 1;
158 }
159
160 static const EVP_CIPHER cast5_cbc = {
161 .nid = NID_cast5_cbc,
162 .block_size = 8,
163 .key_len = CAST_KEY_LENGTH,
164 .iv_len = 8,
165 .flags = EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CBC_MODE,
166 .init = cast_init_key,
167 .do_cipher = cast5_cbc_cipher,
168 .cleanup = NULL,
169 .ctx_size = sizeof(EVP_CAST_KEY),
170 .set_asn1_parameters = EVP_CIPHER_set_asn1_iv,
171 .get_asn1_parameters = EVP_CIPHER_get_asn1_iv,
172 .ctrl = NULL,
173 .app_data = NULL,
174 };
175
176 const EVP_CIPHER *
EVP_cast5_cbc(void)177 EVP_cast5_cbc(void)
178 {
179 return &cast5_cbc;
180 }
181
182 static const EVP_CIPHER cast5_cfb64 = {
183 .nid = NID_cast5_cfb64,
184 .block_size = 1,
185 .key_len = CAST_KEY_LENGTH,
186 .iv_len = 8,
187 .flags = EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CFB_MODE,
188 .init = cast_init_key,
189 .do_cipher = cast5_cfb64_cipher,
190 .cleanup = NULL,
191 .ctx_size = sizeof(EVP_CAST_KEY),
192 .set_asn1_parameters = EVP_CIPHER_set_asn1_iv,
193 .get_asn1_parameters = EVP_CIPHER_get_asn1_iv,
194 .ctrl = NULL,
195 .app_data = NULL,
196 };
197
198 const EVP_CIPHER *
EVP_cast5_cfb64(void)199 EVP_cast5_cfb64(void)
200 {
201 return &cast5_cfb64;
202 }
203
204 static const EVP_CIPHER cast5_ofb = {
205 .nid = NID_cast5_ofb64,
206 .block_size = 1,
207 .key_len = CAST_KEY_LENGTH,
208 .iv_len = 8,
209 .flags = EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_OFB_MODE,
210 .init = cast_init_key,
211 .do_cipher = cast5_ofb_cipher,
212 .cleanup = NULL,
213 .ctx_size = sizeof(EVP_CAST_KEY),
214 .set_asn1_parameters = EVP_CIPHER_set_asn1_iv,
215 .get_asn1_parameters = EVP_CIPHER_get_asn1_iv,
216 .ctrl = NULL,
217 .app_data = NULL,
218 };
219
220 const EVP_CIPHER *
EVP_cast5_ofb(void)221 EVP_cast5_ofb(void)
222 {
223 return &cast5_ofb;
224 }
225
226 static const EVP_CIPHER cast5_ecb = {
227 .nid = NID_cast5_ecb,
228 .block_size = 8,
229 .key_len = CAST_KEY_LENGTH,
230 .iv_len = 0,
231 .flags = EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_ECB_MODE,
232 .init = cast_init_key,
233 .do_cipher = cast5_ecb_cipher,
234 .cleanup = NULL,
235 .ctx_size = sizeof(EVP_CAST_KEY),
236 .set_asn1_parameters = EVP_CIPHER_set_asn1_iv,
237 .get_asn1_parameters = EVP_CIPHER_get_asn1_iv,
238 .ctrl = NULL,
239 .app_data = NULL,
240 };
241
242 const EVP_CIPHER *
EVP_cast5_ecb(void)243 EVP_cast5_ecb(void)
244 {
245 return &cast5_ecb;
246 }
247 #endif
248