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des.h
1 /**
2  * /@code
3  *
4  * \file des.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 
41 #include "ppp_opts.h"
42 #if PPP_INCLUDED_POLARSSL_DES
43 
44 #ifndef PPP_INCLUDED_POLARSSL_DES_H
45 #define PPP_INCLUDED_POLARSSL_DES_H
46 
47 #define DES_ENCRYPT 1
48 #define DES_DECRYPT 0
49 
50 /**
51  * \brief DES context structure
52  */
53 typedef struct
54 {
55  int mode; /*!< encrypt/decrypt */
56  unsigned long sk[32]; /*!< DES subkeys */
57 }
58 des_context;
59 
60 #ifdef __cplusplus
61 extern "C" {
62 #endif
63 
64 /**
65  * \brief DES key schedule (56-bit, encryption)
66  *
67  * \param ctx DES context to be initialized
68  * \param key 8-byte secret key
69  */
70 void des_setkey_enc( des_context *ctx, unsigned char key[8] );
71 
72 /**
73  * \brief DES key schedule (56-bit, decryption)
74  *
75  * \param ctx DES context to be initialized
76  * \param key 8-byte secret key
77  */
78 void des_setkey_dec( des_context *ctx, unsigned char key[8] );
79 
80 /**
81  * \brief DES-ECB block encryption/decryption
82  *
83  * \param ctx DES context
84  * \param input 64-bit input block
85  * \param output 64-bit output block
86  */
87 void des_crypt_ecb( des_context *ctx,
88  const unsigned char input[8],
89  unsigned char output[8] );
90 
91 #ifdef __cplusplus
92 }
93 #endif
94 
95 #endif /* PPP_INCLUDED_POLARSSL_DES_H */
96 
97 #endif /* PPP_INCLUDED_POLARSSL_DES */
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