e_rc4.c revision 296465 
1/* crypto/evp/e_rc4.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_RC4
63
64# include <openssl/evp.h>
65# include <openssl/objects.h>
66# include <openssl/rc4.h>
67# include "evp_locl.h"
68
69/* FIXME: surely this is available elsewhere? */
70# define EVP_RC4_KEY_SIZE                16
71
72typedef struct {
73    RC4_KEY ks;                 /* working key */
74} EVP_RC4_KEY;
75
76# define data(ctx) ((EVP_RC4_KEY *)(ctx)->cipher_data)
77
78static int rc4_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
79                        const unsigned char *iv, int enc);
80static int rc4_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
81                      const unsigned char *in, unsigned int inl);
82static const EVP_CIPHER r4_cipher = {
83    NID_rc4,
84    1, EVP_RC4_KEY_SIZE, 0,
85    EVP_CIPH_VARIABLE_LENGTH,
86    rc4_init_key,
87    rc4_cipher,
88    NULL,
89    sizeof(EVP_RC4_KEY),
90    NULL,
91    NULL,
92    NULL,
93    NULL
94};
95
96static const EVP_CIPHER r4_40_cipher = {
97    NID_rc4_40,
98    1, 5 /* 40 bit */ , 0,
99    EVP_CIPH_VARIABLE_LENGTH,
100    rc4_init_key,
101    rc4_cipher,
102    NULL,
103    sizeof(EVP_RC4_KEY),
104    NULL,
105    NULL,
106    NULL,
107    NULL
108};
109
110const EVP_CIPHER *EVP_rc4(void)
111{
112    return (&r4_cipher);
113}
114
115const EVP_CIPHER *EVP_rc4_40(void)
116{
117    return (&r4_40_cipher);
118}
119
120static int rc4_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
121                        const unsigned char *iv, int enc)
122{
123    RC4_set_key(&data(ctx)->ks, EVP_CIPHER_CTX_key_length(ctx), key);
124    return 1;
125}
126
127static int rc4_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
128                      const unsigned char *in, unsigned int inl)
129{
130    RC4(&data(ctx)->ks, inl, in, out);
131    return 1;
132}
133#endif
134