1 /* $OpenBSD: e_rc4.c,v 1.20 2024/04/09 13:52:41 beck Exp $ */
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
61 #include <openssl/opensslconf.h>
62
63 #ifndef OPENSSL_NO_RC4
64
65 #include <openssl/evp.h>
66 #include <openssl/objects.h>
67 #include <openssl/rc4.h>
68
69 #include "evp_local.h"
70
71 /* FIXME: surely this is available elsewhere? */
72 #define EVP_RC4_KEY_SIZE 16
73
74 typedef struct {
75 RC4_KEY ks; /* working key */
76 } EVP_RC4_KEY;
77
78 #define data(ctx) ((EVP_RC4_KEY *)(ctx)->cipher_data)
79
80 static int rc4_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
81 const unsigned char *iv, int enc);
82 static int rc4_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
83 const unsigned char *in, size_t inl);
84
85 static const EVP_CIPHER r4_cipher = {
86 .nid = NID_rc4,
87 .block_size = 1,
88 .key_len = EVP_RC4_KEY_SIZE,
89 .iv_len = 0,
90 .flags = EVP_CIPH_VARIABLE_LENGTH,
91 .init = rc4_init_key,
92 .do_cipher = rc4_cipher,
93 .cleanup = NULL,
94 .ctx_size = sizeof(EVP_RC4_KEY),
95 .set_asn1_parameters = NULL,
96 .get_asn1_parameters = NULL,
97 .ctrl = NULL,
98 };
99
100 static const EVP_CIPHER r4_40_cipher = {
101 .nid = NID_rc4_40,
102 .block_size = 1,
103 .key_len = 5,
104 .iv_len = 0,
105 .flags = EVP_CIPH_VARIABLE_LENGTH,
106 .init = rc4_init_key,
107 .do_cipher = rc4_cipher,
108 .cleanup = NULL,
109 .ctx_size = sizeof(EVP_RC4_KEY),
110 .set_asn1_parameters = NULL,
111 .get_asn1_parameters = NULL,
112 .ctrl = NULL,
113 };
114
115 const EVP_CIPHER *
EVP_rc4(void)116 EVP_rc4(void)
117 {
118 return (&r4_cipher);
119 }
120 LCRYPTO_ALIAS(EVP_rc4);
121
122 const EVP_CIPHER *
EVP_rc4_40(void)123 EVP_rc4_40(void)
124 {
125 return (&r4_40_cipher);
126 }
127 LCRYPTO_ALIAS(EVP_rc4_40);
128
129 static int
rc4_init_key(EVP_CIPHER_CTX * ctx,const unsigned char * key,const unsigned char * iv,int enc)130 rc4_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
131 const unsigned char *iv, int enc)
132 {
133 RC4_set_key(&data(ctx)->ks, EVP_CIPHER_CTX_key_length(ctx), key);
134 return 1;
135 }
136
137 static int
rc4_cipher(EVP_CIPHER_CTX * ctx,unsigned char * out,const unsigned char * in,size_t inl)138 rc4_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
139 const unsigned char *in, size_t inl)
140 {
141 RC4(&data(ctx)->ks, inl, in, out);
142 return 1;
143 }
144 #endif
145