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authorcvs2svn <admin@example.com>2001-10-01 21:58:54 +0000
committercvs2svn <admin@example.com>2001-10-01 21:58:54 +0000
commit2b482d950b0e856294fcd4c1068c1b21939a7240 (patch)
treeaa05f6be64877f76547f1b54ad84f7bfcb291f5d /src/lib/libcrypto/evp/e_rc2.c
parentd7b0aad33e28dafbbef67eb5b84ecb05a844fc88 (diff)
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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 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
67static int rc2_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
68 const unsigned char *iv,int enc);
69static int rc2_meth_to_magic(EVP_CIPHER_CTX *ctx);
70static int rc2_magic_to_meth(int i);
71static int rc2_set_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type);
72static int rc2_get_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type);
73static int rc2_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr);
74
75IMPLEMENT_BLOCK_CIPHER(rc2, rc2.ks, RC2, rc2, NID_rc2,
76 8,
77 EVP_RC2_KEY_SIZE, 8,
78 EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT,
79 rc2_init_key, NULL,
80 rc2_set_asn1_type_and_iv, rc2_get_asn1_type_and_iv,
81 rc2_ctrl)
82
83#define RC2_40_MAGIC 0xa0
84#define RC2_64_MAGIC 0x78
85#define RC2_128_MAGIC 0x3a
86
87static EVP_CIPHER r2_64_cbc_cipher=
88 {
89 NID_rc2_64_cbc,
90 8,8 /* 64 bit */,8,
91 EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT,
92 rc2_init_key,
93 rc2_cbc_cipher,
94 NULL,
95 sizeof(EVP_CIPHER_CTX)-sizeof((((EVP_CIPHER_CTX *)NULL)->c))+
96 sizeof((((EVP_CIPHER_CTX *)NULL)->c.rc2)),
97 rc2_set_asn1_type_and_iv,
98 rc2_get_asn1_type_and_iv,
99 rc2_ctrl,
100 NULL
101 };
102
103static EVP_CIPHER r2_40_cbc_cipher=
104 {
105 NID_rc2_40_cbc,
106 8,5 /* 40 bit */,8,
107 EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT,
108 rc2_init_key,
109 rc2_cbc_cipher,
110 NULL,
111 sizeof(EVP_CIPHER_CTX)-sizeof((((EVP_CIPHER_CTX *)NULL)->c))+
112 sizeof((((EVP_CIPHER_CTX *)NULL)->c.rc2)),
113 rc2_set_asn1_type_and_iv,
114 rc2_get_asn1_type_and_iv,
115 rc2_ctrl,
116 NULL
117 };
118
119EVP_CIPHER *EVP_rc2_64_cbc(void)
120 {
121 return(&r2_64_cbc_cipher);
122 }
123
124EVP_CIPHER *EVP_rc2_40_cbc(void)
125 {
126 return(&r2_40_cbc_cipher);
127 }
128
129static int rc2_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
130 const unsigned char *iv, int enc)
131 {
132 RC2_set_key(&(ctx->c.rc2.ks),EVP_CIPHER_CTX_key_length(ctx),
133 key,ctx->c.rc2.key_bits);
134 return 1;
135 }
136
137static int rc2_meth_to_magic(EVP_CIPHER_CTX *e)
138 {
139 int i;
140
141 EVP_CIPHER_CTX_ctrl(e, EVP_CTRL_GET_RC2_KEY_BITS, 0, &i);
142 if (i == 128) return(RC2_128_MAGIC);
143 else if (i == 64) return(RC2_64_MAGIC);
144 else if (i == 40) return(RC2_40_MAGIC);
145 else return(0);
146 }
147
148static int rc2_magic_to_meth(int i)
149 {
150 if (i == RC2_128_MAGIC) return 128;
151 else if (i == RC2_64_MAGIC) return 64;
152 else if (i == RC2_40_MAGIC) return 40;
153 else
154 {
155 EVPerr(EVP_F_RC2_MAGIC_TO_METH,EVP_R_UNSUPPORTED_KEY_SIZE);
156 return(0);
157 }
158 }
159
160static int rc2_get_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
161 {
162 long num=0;
163 int i=0,l;
164 int key_bits;
165 unsigned char iv[EVP_MAX_IV_LENGTH];
166
167 if (type != NULL)
168 {
169 l=EVP_CIPHER_CTX_iv_length(c);
170 i=ASN1_TYPE_get_int_octetstring(type,&num,iv,l);
171 if (i != l)
172 return(-1);
173 key_bits =rc2_magic_to_meth((int)num);
174 if (!key_bits)
175 return(-1);
176 if(i > 0) EVP_CipherInit(c, NULL, NULL, iv, -1);
177 EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_RC2_KEY_BITS, key_bits, NULL);
178 EVP_CIPHER_CTX_set_key_length(c, key_bits / 8);
179 }
180 return(i);
181 }
182
183static int rc2_set_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
184 {
185 long num;
186 int i=0,j;
187
188 if (type != NULL)
189 {
190 num=rc2_meth_to_magic(c);
191 j=EVP_CIPHER_CTX_iv_length(c);
192 i=ASN1_TYPE_set_int_octetstring(type,num,c->oiv,j);
193 }
194 return(i);
195 }
196
197static int rc2_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr)
198 {
199 switch(type) {
200
201 case EVP_CTRL_INIT:
202 c->c.rc2.key_bits = EVP_CIPHER_CTX_key_length(c) * 8;
203 return 1;
204
205 case EVP_CTRL_GET_RC2_KEY_BITS:
206 *(int *)ptr = c->c.rc2.key_bits;
207 return 1;
208
209
210 case EVP_CTRL_SET_RC2_KEY_BITS:
211 if(arg > 0) {
212 c->c.rc2.key_bits = arg;
213 return 1;
214 }
215 return 0;
216
217 default:
218 return -1;
219 }
220 }
221
222#endif
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