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57ae2e24 | 1 | /* crypto/evp/e_rc2.c */ |
58964a49 | 2 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
d02b48c6 RE |
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 | ||
d02b48c6 RE |
59 | #include <stdio.h> |
60 | #include "cryptlib.h" | |
c7e7fc3e RL |
61 | |
62 | #ifndef OPENSSL_NO_RC2 | |
63 | ||
ec577822 BM |
64 | #include <openssl/evp.h> |
65 | #include <openssl/objects.h> | |
57ae2e24 | 66 | #include "evp_locl.h" |
dbad1690 | 67 | #include <openssl/rc2.h> |
d02b48c6 | 68 | |
1921eaad BL |
69 | static int rc2_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key, |
70 | const unsigned char *iv,int enc); | |
49528751 DSH |
71 | static int rc2_meth_to_magic(EVP_CIPHER_CTX *ctx); |
72 | static int rc2_magic_to_meth(int i); | |
dfeab068 RE |
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); | |
49528751 | 75 | static int rc2_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr); |
dfeab068 | 76 | |
dbad1690 BL |
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, | |
57ae2e24 | 86 | 8, |
a6cd8707 | 87 | RC2_KEY_LENGTH, 8, 64, |
49528751 DSH |
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) | |
57ae2e24 | 92 | |
dfeab068 RE |
93 | #define RC2_40_MAGIC 0xa0 |
94 | #define RC2_64_MAGIC 0x78 | |
95 | #define RC2_128_MAGIC 0x3a | |
96 | ||
13588350 | 97 | static const EVP_CIPHER r2_64_cbc_cipher= |
dfeab068 | 98 | { |
1b266dab | 99 | NID_rc2_64_cbc, |
dfeab068 | 100 | 8,8 /* 64 bit */,8, |
49528751 | 101 | EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT, |
57ae2e24 | 102 | rc2_init_key, |
dfeab068 RE |
103 | rc2_cbc_cipher, |
104 | NULL, | |
dbad1690 | 105 | sizeof(EVP_RC2_KEY), |
dfeab068 RE |
106 | rc2_set_asn1_type_and_iv, |
107 | rc2_get_asn1_type_and_iv, | |
49528751 | 108 | rc2_ctrl, |
7f060601 | 109 | NULL |
58964a49 RE |
110 | }; |
111 | ||
13588350 | 112 | static const EVP_CIPHER r2_40_cbc_cipher= |
58964a49 RE |
113 | { |
114 | NID_rc2_40_cbc, | |
115 | 8,5 /* 40 bit */,8, | |
49528751 | 116 | EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT, |
57ae2e24 | 117 | rc2_init_key, |
58964a49 RE |
118 | rc2_cbc_cipher, |
119 | NULL, | |
dbad1690 | 120 | sizeof(EVP_RC2_KEY), |
dfeab068 RE |
121 | rc2_set_asn1_type_and_iv, |
122 | rc2_get_asn1_type_and_iv, | |
49528751 | 123 | rc2_ctrl, |
7f060601 | 124 | NULL |
d02b48c6 RE |
125 | }; |
126 | ||
13588350 | 127 | const EVP_CIPHER *EVP_rc2_64_cbc(void) |
dfeab068 RE |
128 | { |
129 | return(&r2_64_cbc_cipher); | |
130 | } | |
131 | ||
13588350 | 132 | const EVP_CIPHER *EVP_rc2_40_cbc(void) |
58964a49 RE |
133 | { |
134 | return(&r2_40_cbc_cipher); | |
135 | } | |
d02b48c6 | 136 | |
1921eaad BL |
137 | static int rc2_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key, |
138 | const unsigned char *iv, int enc) | |
d02b48c6 | 139 | { |
dbad1690 BL |
140 | RC2_set_key(&data(ctx)->ks,EVP_CIPHER_CTX_key_length(ctx), |
141 | key,data(ctx)->key_bits); | |
be06a934 | 142 | return 1; |
d02b48c6 RE |
143 | } |
144 | ||
49528751 | 145 | static int rc2_meth_to_magic(EVP_CIPHER_CTX *e) |
dfeab068 RE |
146 | { |
147 | int i; | |
148 | ||
49528751 DSH |
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); | |
dfeab068 RE |
153 | else return(0); |
154 | } | |
155 | ||
49528751 | 156 | static int rc2_magic_to_meth(int i) |
dfeab068 | 157 | { |
49528751 DSH |
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; | |
dfeab068 RE |
161 | else |
162 | { | |
163 | EVPerr(EVP_F_RC2_MAGIC_TO_METH,EVP_R_UNSUPPORTED_KEY_SIZE); | |
49528751 | 164 | return(0); |
dfeab068 RE |
165 | } |
166 | } | |
167 | ||
6b691a5c | 168 | static int rc2_get_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type) |
dfeab068 RE |
169 | { |
170 | long num=0; | |
171 | int i=0,l; | |
49528751 DSH |
172 | int key_bits; |
173 | unsigned char iv[EVP_MAX_IV_LENGTH]; | |
dfeab068 RE |
174 | |
175 | if (type != NULL) | |
176 | { | |
177 | l=EVP_CIPHER_CTX_iv_length(c); | |
54a656ef | 178 | OPENSSL_assert(l <= sizeof iv); |
49528751 | 179 | i=ASN1_TYPE_get_int_octetstring(type,&num,iv,l); |
dfeab068 RE |
180 | if (i != l) |
181 | return(-1); | |
49528751 DSH |
182 | key_bits =rc2_magic_to_meth((int)num); |
183 | if (!key_bits) | |
dfeab068 | 184 | return(-1); |
581f1c84 | 185 | if(i > 0) EVP_CipherInit_ex(c, NULL, NULL, NULL, iv, -1); |
49528751 DSH |
186 | EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_RC2_KEY_BITS, key_bits, NULL); |
187 | EVP_CIPHER_CTX_set_key_length(c, key_bits / 8); | |
dfeab068 RE |
188 | } |
189 | return(i); | |
190 | } | |
191 | ||
6b691a5c | 192 | static int rc2_set_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type) |
dfeab068 RE |
193 | { |
194 | long num; | |
195 | int i=0,j; | |
196 | ||
197 | if (type != NULL) | |
198 | { | |
49528751 | 199 | num=rc2_meth_to_magic(c); |
dfeab068 RE |
200 | j=EVP_CIPHER_CTX_iv_length(c); |
201 | i=ASN1_TYPE_set_int_octetstring(type,num,c->oiv,j); | |
202 | } | |
203 | return(i); | |
204 | } | |
205 | ||
49528751 DSH |
206 | static int rc2_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr) |
207 | { | |
dbad1690 BL |
208 | switch(type) |
209 | { | |
210 | case EVP_CTRL_INIT: | |
211 | data(c)->key_bits = EVP_CIPHER_CTX_key_length(c) * 8; | |
212 | return 1; | |
49528751 | 213 | |
dbad1690 BL |
214 | case EVP_CTRL_GET_RC2_KEY_BITS: |
215 | *(int *)ptr = data(c)->key_bits; | |
216 | return 1; | |
49528751 | 217 | |
dbad1690 BL |
218 | case EVP_CTRL_SET_RC2_KEY_BITS: |
219 | if(arg > 0) | |
220 | { | |
221 | data(c)->key_bits = arg; | |
222 | return 1; | |
49528751 | 223 | } |
dbad1690 | 224 | return 0; |
49528751 | 225 | |
dbad1690 BL |
226 | default: |
227 | return -1; | |
49528751 DSH |
228 | } |
229 | } | |
230 | ||
d02b48c6 | 231 | #endif |