1 /* crypto/evp/e_rc5.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_RC5
63
64 #include <openssl/evp.h>
65 #include <openssl/objects.h>
66 #include "evp_locl.h"
67 #include <openssl/rc5.h>
68
69 static int r_32_12_16_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
70 const unsigned char *iv,int enc);
71 static int rc5_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr);
72
73 typedef struct
74 {
75 int rounds; /* number of rounds */
76 RC5_32_KEY ks; /* key schedule */
77 } EVP_RC5_KEY;
78
79 #define data(ctx) EVP_C_DATA(EVP_RC5_KEY,ctx)
80
81 IMPLEMENT_BLOCK_CIPHER(rc5_32_12_16, ks, RC5_32, EVP_RC5_KEY, NID_rc5,
82 8, RC5_32_KEY_LENGTH, 8, 64,
83 EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT,
84 r_32_12_16_init_key, NULL,
85 NULL, NULL, rc5_ctrl)
86
87 static int rc5_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr)
88 {
89 switch(type)
90 {
91 case EVP_CTRL_INIT:
92 data(c)->rounds = RC5_12_ROUNDS;
93 return 1;
94
95 case EVP_CTRL_GET_RC5_ROUNDS:
96 *(int *)ptr = data(c)->rounds;
97 return 1;
98
99 case EVP_CTRL_SET_RC5_ROUNDS:
100 switch(arg)
101 {
102 case RC5_8_ROUNDS:
103 case RC5_12_ROUNDS:
104 case RC5_16_ROUNDS:
105 data(c)->rounds = arg;
106 return 1;
107
108 default:
109 EVPerr(EVP_F_RC5_CTRL, EVP_R_UNSUPORTED_NUMBER_OF_ROUNDS);
110 return 0;
111 }
112
113 default:
114 return -1;
115 }
116 }
117
118 static int r_32_12_16_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
119 const unsigned char *iv, int enc)
120 {
121 RC5_32_set_key(&data(ctx)->ks,EVP_CIPHER_CTX_key_length(ctx),
122 key,data(ctx)->rounds);
123 return 1;
124 }
125
126 #endif