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 "evp_locl.h"
66 #include <openssl/objects.h>
67 #include <openssl/rc4.h>
68
69 /* FIXME: surely this is available elsewhere? */
70 #define EVP_RC4_KEY_SIZE 16
71
72 typedef struct
73 {
74 RC4_KEY ks; /* working key */
75 } EVP_RC4_KEY;
76
77 #define data(ctx) ((EVP_RC4_KEY *)(ctx)->cipher_data)
78
79 static int rc4_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
80 const unsigned char *iv,int enc);
81 static int rc4_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
82 const unsigned char *in, size_t inl);
83 static const EVP_CIPHER r4_cipher=
84 {
85 NID_rc4,
86 1,EVP_RC4_KEY_SIZE,0,
87 EVP_CIPH_VARIABLE_LENGTH,
88 rc4_init_key,
89 rc4_cipher,
90 NULL,
91 sizeof(EVP_RC4_KEY),
92 NULL,
93 NULL,
94 NULL,
95 NULL
96 };
97
98 static const EVP_CIPHER r4_40_cipher=
99 {
100 NID_rc4_40,
101 1,5 /* 40 bit */,0,
102 EVP_CIPH_VARIABLE_LENGTH,
103 rc4_init_key,
104 rc4_cipher,
105 NULL,
106 sizeof(EVP_RC4_KEY),
107 NULL,
108 NULL,
109 NULL,
110 NULL
111 };
112
113 const EVP_CIPHER *EVP_rc4(void)
114 {
115 return(&r4_cipher);
116 }
117
118 const EVP_CIPHER *EVP_rc4_40(void)
119 {
120 return(&r4_40_cipher);
121 }
122
123 static int rc4_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
124 const unsigned char *iv, int enc)
125 {
126 RC4_set_key(&data(ctx)->ks,EVP_CIPHER_CTX_key_length(ctx),
127 key);
128 return 1;
129 }
130
131 static int rc4_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
132 const unsigned char *in, size_t inl)
133 {
134 RC4(&data(ctx)->ks,inl,in,out);
135 return 1;
136 }
137 #endif