e_rc5.c revision 296465 
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
69static int r_32_12_16_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
70                               const unsigned char *iv, int enc);
71static int rc5_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr);
72
73typedef struct {
74    int rounds;                 /* number of rounds */
75    RC5_32_KEY ks;              /* key schedule */
76} EVP_RC5_KEY;
77
78# define data(ctx)       EVP_C_DATA(EVP_RC5_KEY,ctx)
79
80IMPLEMENT_BLOCK_CIPHER(rc5_32_12_16, ks, RC5_32, EVP_RC5_KEY, NID_rc5,
81                       8, RC5_32_KEY_LENGTH, 8, 64,
82                       EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT,
83                       r_32_12_16_init_key, NULL, NULL, NULL, rc5_ctrl)
84
85static int rc5_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr)
86{
87    switch (type) {
88    case EVP_CTRL_INIT:
89        data(c)->rounds = RC5_12_ROUNDS;
90        return 1;
91
92    case EVP_CTRL_GET_RC5_ROUNDS:
93        *(int *)ptr = data(c)->rounds;
94        return 1;
95
96    case EVP_CTRL_SET_RC5_ROUNDS:
97        switch (arg) {
98        case RC5_8_ROUNDS:
99        case RC5_12_ROUNDS:
100        case RC5_16_ROUNDS:
101            data(c)->rounds = arg;
102            return 1;
103
104        default:
105            EVPerr(EVP_F_RC5_CTRL, EVP_R_UNSUPORTED_NUMBER_OF_ROUNDS);
106            return 0;
107        }
108
109    default:
110        return -1;
111    }
112}
113
114static int r_32_12_16_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
115                               const unsigned char *iv, int enc)
116{
117    RC5_32_set_key(&data(ctx)->ks, EVP_CIPHER_CTX_key_length(ctx),
118                   key, data(ctx)->rounds);
119    return 1;
120}
121
122#endif
123