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1/* $OpenBSD: e_bf.c,v 1.19 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_BF
65
66#include <openssl/blowfish.h>
67#include <openssl/evp.h>
68#include <openssl/objects.h>
69
70#include "evp_local.h"
71
72typedef struct {
73 BF_KEY ks;
74} EVP_BF_KEY;
75
76#define data(ctx) ((EVP_BF_KEY *)(ctx)->cipher_data)
77
78static int
79bf_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
80 const unsigned char *iv, int enc)
81{
82 BF_set_key(&data(ctx)->ks, EVP_CIPHER_CTX_key_length(ctx), key);
83 return 1;
84}
85
86static int
87bf_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 BF_cbc_encrypt(in, out, (long)chunk, &((EVP_BF_KEY *)ctx->cipher_data)->ks, ctx->iv, ctx->encrypt);
93 inl -= chunk;
94 in += chunk;
95 out += chunk;
96 }
97
98 if (inl)
99 BF_cbc_encrypt(in, out, (long)inl, &((EVP_BF_KEY *)ctx->cipher_data)->ks, ctx->iv, ctx->encrypt);
100
101 return 1;
102}
103
104static int
105bf_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 BF_cfb64_encrypt(in, out, (long)chunk, &((EVP_BF_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
125bf_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 BF_ecb_encrypt(in + i, out + i, &((EVP_BF_KEY *)ctx->cipher_data)->ks, ctx->encrypt);
138
139 return 1;
140}
141
142static int
143bf_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 BF_ofb64_encrypt(in, out, (long)chunk, &((EVP_BF_KEY *)ctx->cipher_data)->ks, ctx->iv, &ctx->num);
149 inl -= chunk;
150 in += chunk;
151 out += chunk;
152 }
153
154 if (inl)
155 BF_ofb64_encrypt(in, out, (long)inl, &((EVP_BF_KEY *)ctx->cipher_data)->ks, ctx->iv, &ctx->num);
156
157 return 1;
158}
159
160static const EVP_CIPHER bf_cbc = {
161 .nid = NID_bf_cbc,
162 .block_size = 8,
163 .key_len = 16,
164 .iv_len = 8,
165 .flags = EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CBC_MODE,
166 .init = bf_init_key,
167 .do_cipher = bf_cbc_cipher,
168 .cleanup = NULL,
169 .ctx_size = sizeof(EVP_BF_KEY),
170 .set_asn1_parameters = EVP_CIPHER_set_asn1_iv,
171 .get_asn1_parameters = EVP_CIPHER_get_asn1_iv,
172 .ctrl = NULL,
173};
174
175const EVP_CIPHER *
176EVP_bf_cbc(void)
177{
178 return &bf_cbc;
179}
180LCRYPTO_ALIAS(EVP_bf_cbc);
181
182static const EVP_CIPHER bf_cfb64 = {
183 .nid = NID_bf_cfb64,
184 .block_size = 1,
185 .key_len = 16,
186 .iv_len = 8,
187 .flags = EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CFB_MODE,
188 .init = bf_init_key,
189 .do_cipher = bf_cfb64_cipher,
190 .cleanup = NULL,
191 .ctx_size = sizeof(EVP_BF_KEY),
192 .set_asn1_parameters = EVP_CIPHER_set_asn1_iv,
193 .get_asn1_parameters = EVP_CIPHER_get_asn1_iv,
194 .ctrl = NULL,
195};
196
197const EVP_CIPHER *
198EVP_bf_cfb64(void)
199{
200 return &bf_cfb64;
201}
202LCRYPTO_ALIAS(EVP_bf_cfb64);
203
204static const EVP_CIPHER bf_ofb = {
205 .nid = NID_bf_ofb64,
206 .block_size = 1,
207 .key_len = 16,
208 .iv_len = 8,
209 .flags = EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_OFB_MODE,
210 .init = bf_init_key,
211 .do_cipher = bf_ofb_cipher,
212 .cleanup = NULL,
213 .ctx_size = sizeof(EVP_BF_KEY),
214 .set_asn1_parameters = EVP_CIPHER_set_asn1_iv,
215 .get_asn1_parameters = EVP_CIPHER_get_asn1_iv,
216 .ctrl = NULL,
217};
218
219const EVP_CIPHER *
220EVP_bf_ofb(void)
221{
222 return &bf_ofb;
223}
224LCRYPTO_ALIAS(EVP_bf_ofb);
225
226static const EVP_CIPHER bf_ecb = {
227 .nid = NID_bf_ecb,
228 .block_size = 8,
229 .key_len = 16,
230 .iv_len = 0,
231 .flags = EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_ECB_MODE,
232 .init = bf_init_key,
233 .do_cipher = bf_ecb_cipher,
234 .cleanup = NULL,
235 .ctx_size = sizeof(EVP_BF_KEY),
236 .set_asn1_parameters = EVP_CIPHER_set_asn1_iv,
237 .get_asn1_parameters = EVP_CIPHER_get_asn1_iv,
238 .ctrl = NULL,
239};
240
241const EVP_CIPHER *
242EVP_bf_ecb(void)
243{
244 return &bf_ecb;
245}
246LCRYPTO_ALIAS(EVP_bf_ecb);
247#endif
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