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arc4.h
1 /**
2  * /@code
3  *
4  * \file arc4.h
5  *
6  * Based on XySSL: Copyright (C) 2006-2008 Christophe Devine
7  *
8  * Copyright (C) 2009 Paul Bakker <polarssl_maintainer at polarssl dot org>
9  *
10  * All rights reserved.
11  *
12  * Redistribution and use in source and binary forms, with or without
13  * modification, are permitted provided that the following conditions
14  * are met:
15  *
16  * * Redistributions of source code must retain the above copyright
17  * notice, this list of conditions and the following disclaimer.
18  * * Redistributions in binary form must reproduce the above copyright
19  * notice, this list of conditions and the following disclaimer in the
20  * documentation and/or other materials provided with the distribution.
21  * * Neither the names of PolarSSL or XySSL nor the names of its contributors
22  * may be used to endorse or promote products derived from this software
23  * without specific prior written permission.
24  *
25  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
26  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
27  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
28  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
29  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
30  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
31  * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
32  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
33  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
34  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
35  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36  *
37  * /@endcode
38  */
39 
40 #include "ppp_opts.h"
41 #if PPP_INCLUDED_POLARSSL_ARC4
42 
43 #ifndef PPP_INCLUDED_POLARSSL_ARC4_H
44 #define PPP_INCLUDED_POLARSSL_ARC4_H
45 
46 /**
47  * \brief ARC4 context structure
48  */
49 typedef struct
50 {
51  int x; /*!< permutation index */
52  int y; /*!< permutation index */
53  unsigned char m[256]; /*!< permutation table */
54 }
55 arc4_context;
56 
57 #ifdef __cplusplus
58 extern "C" {
59 #endif
60 
61 /**
62  * \brief ARC4 key schedule
63  *
64  * \param ctx ARC4 context to be initialized
65  * \param key the secret key
66  * \param keylen length of the key
67  */
68 void arc4_setup( arc4_context *ctx, unsigned char *key, int keylen );
69 
70 /**
71  * \brief ARC4 cipher function
72  *
73  * \param ctx ARC4 context
74  * \param buf buffer to be processed
75  * \param buflen amount of data in buf
76  */
77 void arc4_crypt( arc4_context *ctx, unsigned char *buf, int buflen );
78 
79 #ifdef __cplusplus
80 }
81 #endif
82 
83 #endif /* PPP_INCLUDED_POLARSSL_ARC4_H */
84 
85 #endif /* PPP_INCLUDED_POLARSSL_ARC4 */
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