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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 : :
68 : : /* FIXME: surely this is available elsewhere? */
69 : : #define EVP_RC4_KEY_SIZE 16
70 : :
71 : : typedef struct
72 : : {
73 : : RC4_KEY ks; /* working key */
74 : : } EVP_RC4_KEY;
75 : :
76 : : #define data(ctx) ((EVP_RC4_KEY *)(ctx)->cipher_data)
77 : :
78 : : static int rc4_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
79 : : const unsigned char *iv,int enc);
80 : : static int rc4_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
81 : : const unsigned char *in, size_t inl);
82 : : static const EVP_CIPHER r4_cipher=
83 : : {
84 : : NID_rc4,
85 : : 1,EVP_RC4_KEY_SIZE,0,
86 : : EVP_CIPH_VARIABLE_LENGTH,
87 : : rc4_init_key,
88 : : rc4_cipher,
89 : : NULL,
90 : : sizeof(EVP_RC4_KEY),
91 : : NULL,
92 : : NULL,
93 : : NULL,
94 : : NULL
95 : : };
96 : :
97 : : static const EVP_CIPHER r4_40_cipher=
98 : : {
99 : : NID_rc4_40,
100 : : 1,5 /* 40 bit */,0,
101 : : EVP_CIPH_VARIABLE_LENGTH,
102 : : rc4_init_key,
103 : : rc4_cipher,
104 : : NULL,
105 : : sizeof(EVP_RC4_KEY),
106 : : NULL,
107 : : NULL,
108 : : NULL,
109 : : NULL
110 : : };
111 : :
112 : 1695 : const EVP_CIPHER *EVP_rc4(void)
113 : : {
114 : 1695 : return(&r4_cipher);
115 : : }
116 : :
117 : 726 : const EVP_CIPHER *EVP_rc4_40(void)
118 : : {
119 : 726 : return(&r4_40_cipher);
120 : : }
121 : :
122 : 152 : static int rc4_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
123 : : const unsigned char *iv, int enc)
124 : : {
125 : 152 : RC4_set_key(&data(ctx)->ks,EVP_CIPHER_CTX_key_length(ctx),
126 : : key);
127 : 152 : return 1;
128 : : }
129 : :
130 : 406 : static int rc4_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
131 : : const unsigned char *in, size_t inl)
132 : : {
133 : 406 : RC4(&data(ctx)->ks,inl,in,out);
134 : 406 : return 1;
135 : : }
136 : : #endif
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