Line data Source code
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 : 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 :
84 605 : IMPLEMENT_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 : # define RC2_40_MAGIC 0xa0
92 : # define RC2_64_MAGIC 0x78
93 : # define RC2_128_MAGIC 0x3a
94 : static const EVP_CIPHER r2_64_cbc_cipher = {
95 : NID_rc2_64_cbc,
96 : 8, 8 /* 64 bit */ , 8,
97 : EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT,
98 : rc2_init_key,
99 : rc2_cbc_cipher,
100 : NULL,
101 : sizeof(EVP_RC2_KEY),
102 : rc2_set_asn1_type_and_iv,
103 : rc2_get_asn1_type_and_iv,
104 : rc2_ctrl,
105 : NULL
106 : };
107 :
108 : static const EVP_CIPHER r2_40_cbc_cipher = {
109 : NID_rc2_40_cbc,
110 : 8, 5 /* 40 bit */ , 8,
111 : EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT,
112 : rc2_init_key,
113 : rc2_cbc_cipher,
114 : NULL,
115 : sizeof(EVP_RC2_KEY),
116 : rc2_set_asn1_type_and_iv,
117 : rc2_get_asn1_type_and_iv,
118 : rc2_ctrl,
119 : NULL
120 : };
121 :
122 121 : const EVP_CIPHER *EVP_rc2_64_cbc(void)
123 : {
124 121 : return (&r2_64_cbc_cipher);
125 : }
126 :
127 242 : const EVP_CIPHER *EVP_rc2_40_cbc(void)
128 : {
129 242 : return (&r2_40_cbc_cipher);
130 : }
131 :
132 0 : static int rc2_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
133 : const unsigned char *iv, int enc)
134 : {
135 0 : RC2_set_key(&data(ctx)->ks, EVP_CIPHER_CTX_key_length(ctx),
136 0 : key, data(ctx)->key_bits);
137 0 : return 1;
138 : }
139 :
140 0 : static int rc2_meth_to_magic(EVP_CIPHER_CTX *e)
141 : {
142 : int i;
143 :
144 0 : EVP_CIPHER_CTX_ctrl(e, EVP_CTRL_GET_RC2_KEY_BITS, 0, &i);
145 0 : if (i == 128)
146 : return (RC2_128_MAGIC);
147 0 : else if (i == 64)
148 : return (RC2_64_MAGIC);
149 0 : else if (i == 40)
150 : return (RC2_40_MAGIC);
151 : else
152 0 : return (0);
153 : }
154 :
155 0 : static int rc2_magic_to_meth(int i)
156 : {
157 0 : if (i == RC2_128_MAGIC)
158 : return 128;
159 0 : else if (i == RC2_64_MAGIC)
160 : return 64;
161 0 : else if (i == RC2_40_MAGIC)
162 : return 40;
163 : else {
164 0 : EVPerr(EVP_F_RC2_MAGIC_TO_METH, EVP_R_UNSUPPORTED_KEY_SIZE);
165 0 : return (0);
166 : }
167 : }
168 :
169 0 : static int rc2_get_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
170 : {
171 0 : long num = 0;
172 : int i = 0;
173 : int key_bits;
174 : unsigned int l;
175 : unsigned char iv[EVP_MAX_IV_LENGTH];
176 :
177 0 : if (type != NULL) {
178 0 : l = EVP_CIPHER_CTX_iv_length(c);
179 0 : OPENSSL_assert(l <= sizeof(iv));
180 0 : i = ASN1_TYPE_get_int_octetstring(type, &num, iv, l);
181 0 : if (i != (int)l)
182 : return (-1);
183 0 : key_bits = rc2_magic_to_meth((int)num);
184 0 : if (!key_bits)
185 : return (-1);
186 0 : if (i > 0 && !EVP_CipherInit_ex(c, NULL, NULL, NULL, iv, -1))
187 : return -1;
188 0 : EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_RC2_KEY_BITS, key_bits, NULL);
189 0 : EVP_CIPHER_CTX_set_key_length(c, key_bits / 8);
190 : }
191 0 : return (i);
192 : }
193 :
194 0 : 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 0 : if (type != NULL) {
200 0 : num = rc2_meth_to_magic(c);
201 0 : j = EVP_CIPHER_CTX_iv_length(c);
202 0 : i = ASN1_TYPE_set_int_octetstring(type, num, c->oiv, j);
203 : }
204 0 : return (i);
205 : }
206 :
207 0 : static int rc2_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr)
208 : {
209 0 : switch (type) {
210 : case EVP_CTRL_INIT:
211 0 : data(c)->key_bits = EVP_CIPHER_CTX_key_length(c) * 8;
212 0 : return 1;
213 :
214 : case EVP_CTRL_GET_RC2_KEY_BITS:
215 0 : *(int *)ptr = data(c)->key_bits;
216 0 : return 1;
217 :
218 : case EVP_CTRL_SET_RC2_KEY_BITS:
219 0 : if (arg > 0) {
220 0 : data(c)->key_bits = arg;
221 0 : return 1;
222 : }
223 : return 0;
224 : # ifdef PBE_PRF_TEST
225 : case EVP_CTRL_PBE_PRF_NID:
226 : *(int *)ptr = NID_hmacWithMD5;
227 : return 1;
228 : # endif
229 :
230 : default:
231 : return -1;
232 : }
233 : }
234 :
235 : #endif
|
