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1/* crypto/evp/e_rc2.c */
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#ifndef OPENSSL_NO_RC2
60
61#include <stdio.h>
62#include "cryptlib.h"
63#include <openssl/evp.h>
64#include <openssl/objects.h>
65#include "evp_locl.h"
66#include <openssl/rc2.h>
67
68static int rc2_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
69 const unsigned char *iv,int enc);
70static int rc2_meth_to_magic(EVP_CIPHER_CTX *ctx);
71static int rc2_magic_to_meth(int i);
72static int rc2_set_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type);
73static int rc2_get_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type);
74static int rc2_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr);
75
76typedef struct
77 {
78 int key_bits; /* effective key bits */
79 RC2_KEY ks; /* key schedule */
80 } EVP_RC2_KEY;
81
82#define data(ctx) ((EVP_RC2_KEY *)(ctx)->cipher_data)
83
84IMPLEMENT_BLOCK_CIPHER(rc2, ks, RC2, EVP_RC2_KEY, NID_rc2,
85 8,
86 RC2_KEY_LENGTH, 8, 64,
87 EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT,
88 rc2_init_key, NULL,
89 rc2_set_asn1_type_and_iv, rc2_get_asn1_type_and_iv,
90 rc2_ctrl)
91
92#define RC2_40_MAGIC 0xa0
93#define RC2_64_MAGIC 0x78
94#define RC2_128_MAGIC 0x3a
95
96static const EVP_CIPHER r2_64_cbc_cipher=
97 {
98 NID_rc2_64_cbc,
99 8,8 /* 64 bit */,8,
100 EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT,
101 rc2_init_key,
102 rc2_cbc_cipher,
103 NULL,
104 sizeof(EVP_RC2_KEY),
105 rc2_set_asn1_type_and_iv,
106 rc2_get_asn1_type_and_iv,
107 rc2_ctrl,
108 NULL
109 };
110
111static const EVP_CIPHER r2_40_cbc_cipher=
112 {
113 NID_rc2_40_cbc,
114 8,5 /* 40 bit */,8,
115 EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT,
116 rc2_init_key,
117 rc2_cbc_cipher,
118 NULL,
119 sizeof(EVP_RC2_KEY),
120 rc2_set_asn1_type_and_iv,
121 rc2_get_asn1_type_and_iv,
122 rc2_ctrl,
123 NULL
124 };
125
126const EVP_CIPHER *EVP_rc2_64_cbc(void)
127 {
128 return(&r2_64_cbc_cipher);
129 }
130
131const EVP_CIPHER *EVP_rc2_40_cbc(void)
132 {
133 return(&r2_40_cbc_cipher);
134 }
135
136static int rc2_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
137 const unsigned char *iv, int enc)
138 {
139 RC2_set_key(&data(ctx)->ks,EVP_CIPHER_CTX_key_length(ctx),
140 key,data(ctx)->key_bits);
141 return 1;
142 }
143
144static int rc2_meth_to_magic(EVP_CIPHER_CTX *e)
145 {
146 int i;
147
148 EVP_CIPHER_CTX_ctrl(e, EVP_CTRL_GET_RC2_KEY_BITS, 0, &i);
149 if (i == 128) return(RC2_128_MAGIC);
150 else if (i == 64) return(RC2_64_MAGIC);
151 else if (i == 40) return(RC2_40_MAGIC);
152 else return(0);
153 }
154
155static int rc2_magic_to_meth(int i)
156 {
157 if (i == RC2_128_MAGIC) return 128;
158 else if (i == RC2_64_MAGIC) return 64;
159 else if (i == RC2_40_MAGIC) return 40;
160 else
161 {
162 EVPerr(EVP_F_RC2_MAGIC_TO_METH,EVP_R_UNSUPPORTED_KEY_SIZE);
163 return(0);
164 }
165 }
166
167static int rc2_get_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
168 {
169 long num=0;
170 int i=0,l;
171 int key_bits;
172 unsigned char iv[EVP_MAX_IV_LENGTH];
173
174 if (type != NULL)
175 {
176 l=EVP_CIPHER_CTX_iv_length(c);
177 OPENSSL_assert(l <= sizeof iv);
178 i=ASN1_TYPE_get_int_octetstring(type,&num,iv,l);
179 if (i != l)
180 return(-1);
181 key_bits =rc2_magic_to_meth((int)num);
182 if (!key_bits)
183 return(-1);
184 if(i > 0) EVP_CipherInit_ex(c, NULL, NULL, NULL, iv, -1);
185 EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_RC2_KEY_BITS, key_bits, NULL);
186 EVP_CIPHER_CTX_set_key_length(c, key_bits / 8);
187 }
188 return(i);
189 }
190
191static int rc2_set_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
192 {
193 long num;
194 int i=0,j;
195
196 if (type != NULL)
197 {
198 num=rc2_meth_to_magic(c);
199 j=EVP_CIPHER_CTX_iv_length(c);
200 i=ASN1_TYPE_set_int_octetstring(type,num,c->oiv,j);
201 }
202 return(i);
203 }
204
205static int rc2_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr)
206 {
207 switch(type)
208 {
209 case EVP_CTRL_INIT:
210 data(c)->key_bits = EVP_CIPHER_CTX_key_length(c) * 8;
211 return 1;
212
213 case EVP_CTRL_GET_RC2_KEY_BITS:
214 *(int *)ptr = data(c)->key_bits;
215 return 1;
216
217 case EVP_CTRL_SET_RC2_KEY_BITS:
218 if(arg > 0)
219 {
220 data(c)->key_bits = arg;
221 return 1;
222 }
223 return 0;
224
225 default:
226 return -1;
227 }
228 }
229
230#endif
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