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 #include <stdio.h>
60 #include "cryptlib.h"
61
62 #ifndef OPENSSL_NO_RC2
63
64 #include <openssl/evp.h>
65 #include <openssl/objects.h>
66 #include "evp_locl.h"
67 #include <openssl/rc2.h>
68
69 static int rc2_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
70 const unsigned char *iv,int enc);
71 static int rc2_meth_to_magic(EVP_CIPHER_CTX *ctx);
72 static int rc2_magic_to_meth(int i);
73 static int rc2_set_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type);
74 static int rc2_get_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type);
75 static int rc2_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr);
76
77 typedef struct
78 {
79 int key_bits; /* effective key bits */
80 RC2_KEY ks; /* key schedule */
81 } EVP_RC2_KEY;
82
83 #define data(ctx) ((EVP_RC2_KEY *)(ctx)->cipher_data)
84
85 IMPLEMENT_BLOCK_CIPHER(rc2, ks, RC2, EVP_RC2_KEY, NID_rc2,
86 8,
87 RC2_KEY_LENGTH, 8, 64,
88 EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT,
89 rc2_init_key, NULL,
90 rc2_set_asn1_type_and_iv, rc2_get_asn1_type_and_iv,
91 rc2_ctrl)
92
93 #define RC2_40_MAGIC 0xa0
94 #define RC2_64_MAGIC 0x78
95 #define RC2_128_MAGIC 0x3a
96
97 static const EVP_CIPHER r2_64_cbc_cipher=
98 {
99 NID_rc2_64_cbc,
100 8,8 /* 64 bit */,8,
101 EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT,
102 rc2_init_key,
103 rc2_cbc_cipher,
104 NULL,
105 sizeof(EVP_RC2_KEY),
106 rc2_set_asn1_type_and_iv,
107 rc2_get_asn1_type_and_iv,
108 rc2_ctrl,
109 NULL
110 };
111
112 static const EVP_CIPHER r2_40_cbc_cipher=
113 {
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
127 const EVP_CIPHER *EVP_rc2_64_cbc(void)
128 {
129 return(&r2_64_cbc_cipher);
130 }
131
132 const EVP_CIPHER *EVP_rc2_40_cbc(void)
133 {
134 return(&r2_40_cbc_cipher);
135 }
136
137 static int rc2_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
138 const unsigned char *iv, int enc)
139 {
140 RC2_set_key(&data(ctx)->ks,EVP_CIPHER_CTX_key_length(ctx),
141 key,data(ctx)->key_bits);
142 return 1;
143 }
144
145 static int rc2_meth_to_magic(EVP_CIPHER_CTX *e)
146 {
147 int i;
148
149 EVP_CIPHER_CTX_ctrl(e, EVP_CTRL_GET_RC2_KEY_BITS, 0, &i);
150 if (i == 128) return(RC2_128_MAGIC);
151 else if (i == 64) return(RC2_64_MAGIC);
152 else if (i == 40) return(RC2_40_MAGIC);
153 else return(0);
154 }
155
156 static int rc2_magic_to_meth(int i)
157 {
158 if (i == RC2_128_MAGIC) return 128;
159 else if (i == RC2_64_MAGIC) return 64;
160 else if (i == RC2_40_MAGIC) return 40;
161 else
162 {
163 EVPerr(EVP_F_RC2_MAGIC_TO_METH,EVP_R_UNSUPPORTED_KEY_SIZE);
164 return(0);
165 }
166 }
167
168 static int rc2_get_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
169 {
170 long num=0;
171 int i=0;
172 int key_bits;
173 unsigned int l;
174 unsigned char iv[EVP_MAX_IV_LENGTH];
175
176 if (type != NULL)
177 {
178 l=EVP_CIPHER_CTX_iv_length(c);
179 OPENSSL_assert(l <= sizeof(iv));
180 i=ASN1_TYPE_get_int_octetstring(type,&num,iv,l);
181 if (i != (int)l)
182 return(-1);
183 key_bits =rc2_magic_to_meth((int)num);
184 if (!key_bits)
185 return(-1);
186 if(i > 0 && !EVP_CipherInit_ex(c, NULL, NULL, NULL, iv, -1))
187 return -1;
188 EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_RC2_KEY_BITS, key_bits, NULL);
189 EVP_CIPHER_CTX_set_key_length(c, key_bits / 8);
190 }
191 return(i);
192 }
193
194 static int rc2_set_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
195 {
196 long num;
197 int i=0,j;
198
199 if (type != NULL)
200 {
201 num=rc2_meth_to_magic(c);
202 j=EVP_CIPHER_CTX_iv_length(c);
203 i=ASN1_TYPE_set_int_octetstring(type,num,c->oiv,j);
204 }
205 return(i);
206 }
207
208 static int rc2_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr)
209 {
210 switch(type)
211 {
212 case EVP_CTRL_INIT:
213 data(c)->key_bits = EVP_CIPHER_CTX_key_length(c) * 8;
214 return 1;
215
216 case EVP_CTRL_GET_RC2_KEY_BITS:
217 *(int *)ptr = data(c)->key_bits;
218 return 1;
219
220 case EVP_CTRL_SET_RC2_KEY_BITS:
221 if(arg > 0)
222 {
223 data(c)->key_bits = arg;
224 return 1;
225 }
226 return 0;
227 #ifdef PBE_PRF_TEST
228 case EVP_CTRL_PBE_PRF_NID:
229 *(int *)ptr = NID_hmacWithMD5;
230 return 1;
231 #endif
232
233 default:
234 return -1;
235 }
236 }
237
238 #endif