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1/* $OpenBSD: e_rc2.c,v 1.11 2015/02/10 09:52:35 miod 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_RC2
64
65#include <openssl/err.h>
66#include <openssl/evp.h>
67#include <openssl/objects.h>
68#include <openssl/rc2.h>
69
70#include "evp_locl.h"
71
72static int rc2_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
73 const unsigned char *iv, int enc);
74static int rc2_meth_to_magic(EVP_CIPHER_CTX *ctx);
75static int rc2_magic_to_meth(int i);
76static int rc2_set_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type);
77static int rc2_get_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type);
78static int rc2_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr);
79
80typedef struct {
81 int key_bits; /* effective key bits */
82 RC2_KEY ks; /* key schedule */
83} EVP_RC2_KEY;
84
85#define data(ctx) ((EVP_RC2_KEY *)(ctx)->cipher_data)
86
87IMPLEMENT_BLOCK_CIPHER(rc2, ks, RC2, EVP_RC2_KEY, NID_rc2,
88 8,
89 RC2_KEY_LENGTH, 8, 64,
90 EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT,
91 rc2_init_key, NULL,
92 rc2_set_asn1_type_and_iv, rc2_get_asn1_type_and_iv,
93 rc2_ctrl)
94
95#define RC2_40_MAGIC 0xa0
96#define RC2_64_MAGIC 0x78
97#define RC2_128_MAGIC 0x3a
98
99static const EVP_CIPHER r2_64_cbc_cipher = {
100 NID_rc2_64_cbc,
101 8, 8 /* 64 bit */, 8,
102 EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT,
103 rc2_init_key,
104 rc2_cbc_cipher,
105 NULL,
106 sizeof(EVP_RC2_KEY),
107 rc2_set_asn1_type_and_iv,
108 rc2_get_asn1_type_and_iv,
109 rc2_ctrl,
110 NULL
111};
112
113static const EVP_CIPHER r2_40_cbc_cipher = {
114 NID_rc2_40_cbc,
115 8, 5 /* 40 bit */, 8,
116 EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT,
117 rc2_init_key,
118 rc2_cbc_cipher,
119 NULL,
120 sizeof(EVP_RC2_KEY),
121 rc2_set_asn1_type_and_iv,
122 rc2_get_asn1_type_and_iv,
123 rc2_ctrl,
124 NULL
125};
126
127const EVP_CIPHER *
128EVP_rc2_64_cbc(void)
129{
130 return (&r2_64_cbc_cipher);
131}
132
133const EVP_CIPHER *
134EVP_rc2_40_cbc(void)
135{
136 return (&r2_40_cbc_cipher);
137}
138
139static int
140rc2_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
141 const unsigned char *iv, int enc)
142{
143 RC2_set_key(&data(ctx)->ks, EVP_CIPHER_CTX_key_length(ctx),
144 key, data(ctx)->key_bits);
145 return 1;
146}
147
148static int
149rc2_meth_to_magic(EVP_CIPHER_CTX *e)
150{
151 int i;
152
153 EVP_CIPHER_CTX_ctrl(e, EVP_CTRL_GET_RC2_KEY_BITS, 0, &i);
154 if (i == 128)
155 return (RC2_128_MAGIC);
156 else if (i == 64)
157 return (RC2_64_MAGIC);
158 else if (i == 40)
159 return (RC2_40_MAGIC);
160 else
161 return (0);
162}
163
164static int
165rc2_magic_to_meth(int i)
166{
167 if (i == RC2_128_MAGIC)
168 return 128;
169 else if (i == RC2_64_MAGIC)
170 return 64;
171 else if (i == RC2_40_MAGIC)
172 return 40;
173 else {
174 EVPerr(EVP_F_RC2_MAGIC_TO_METH, EVP_R_UNSUPPORTED_KEY_SIZE);
175 return (0);
176 }
177}
178
179static int
180rc2_get_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
181{
182 long num = 0;
183 int i = 0;
184 int key_bits;
185 unsigned int l;
186 unsigned char iv[EVP_MAX_IV_LENGTH];
187
188 if (type != NULL) {
189 l = EVP_CIPHER_CTX_iv_length(c);
190 if (l > sizeof(iv)) {
191 EVPerr(EVP_F_RC2_GET_ASN1_TYPE_AND_IV,
192 EVP_R_IV_TOO_LARGE);
193 return -1;
194 }
195 i = ASN1_TYPE_get_int_octetstring(type, &num, iv, l);
196 if (i != (int)l)
197 return (-1);
198 key_bits = rc2_magic_to_meth((int)num);
199 if (!key_bits)
200 return (-1);
201 if (i > 0 && !EVP_CipherInit_ex(c, NULL, NULL, NULL, iv, -1))
202 return -1;
203 EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_RC2_KEY_BITS,
204 key_bits, NULL);
205 EVP_CIPHER_CTX_set_key_length(c, key_bits / 8);
206 }
207 return (i);
208}
209
210static int
211rc2_set_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
212{
213 long num;
214 int i = 0, j;
215
216 if (type != NULL) {
217 num = rc2_meth_to_magic(c);
218 j = EVP_CIPHER_CTX_iv_length(c);
219 i = ASN1_TYPE_set_int_octetstring(type, num, c->oiv, j);
220 }
221 return (i);
222}
223
224static int
225rc2_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr)
226{
227 switch (type) {
228 case EVP_CTRL_INIT:
229 data(c)->key_bits = EVP_CIPHER_CTX_key_length(c) * 8;
230 return 1;
231
232 case EVP_CTRL_GET_RC2_KEY_BITS:
233 *(int *)ptr = data(c)->key_bits;
234 return 1;
235
236 case EVP_CTRL_SET_RC2_KEY_BITS:
237 if (arg > 0) {
238 data(c)->key_bits = arg;
239 return 1;
240 }
241 return 0;
242
243#ifdef PBE_PRF_TEST
244 case EVP_CTRL_PBE_PRF_NID:
245 *(int *)ptr = NID_hmacWithMD5;
246 return 1;
247#endif
248
249 default:
250 return -1;
251 }
252}
253
254#endif
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