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   1 /**
   2  * \file arc4.h
   3  *
   4  * \brief The ARCFOUR stream cipher
   5  *
   6  * \warning   ARC4 is considered a weak cipher and its use constitutes a
   7  *            security risk. We recommend considering stronger ciphers instead.
   8  */
   9 /*
  10  *  Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
  11  *  SPDX-License-Identifier: GPL-2.0
  12  *
  13  *  This program is free software; you can redistribute it and/or modify
  14  *  it under the terms of the GNU General Public License as published by
  15  *  the Free Software Foundation; either version 2 of the License, or
  16  *  (at your option) any later version.
  17  *
  18  *  This program is distributed in the hope that it will be useful,
  19  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  *  GNU General Public License for more details.
  22  *
  23  *  You should have received a copy of the GNU General Public License along
  24  *  with this program; if not, write to the Free Software Foundation, Inc.,
  25  *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  26  *
  27  *  This file is part of mbed TLS (https://tls.mbed.org)
  28  *
  29  */
  30 #ifndef MBEDTLS_ARC4_H
  31 #define MBEDTLS_ARC4_H
  32
  33 #if !defined(MBEDTLS_CONFIG_FILE)
  34 #include "config.h"
  35 #else
  36 #include MBEDTLS_CONFIG_FILE
  37 #endif
  38
  39 #include <stddef.h>
  40
  41 #define MBEDTLS_ERR_ARC4_HW_ACCEL_FAILED                  -0x0019  /**< ARC4 hardware accelerator failed. */
  42
  43 #ifdef __cplusplus
  44 extern "C" {
  45 #endif
  46
  47 #if !defined(MBEDTLS_ARC4_ALT)
  48 // Regular implementation
  49 //
  50
  51 /**
  52  * \brief     ARC4 context structure
  53  *
  54  * \warning   ARC4 is considered a weak cipher and its use constitutes a
  55  *            security risk. We recommend considering stronger ciphers instead.
  56  *
  57  */
  58 typedef struct mbedtls_arc4_context
  59 {
  60     int x;                      /*!< permutation index */
  61     int y;                      /*!< permutation index */
  62     unsigned char m[256];       /*!< permutation table */
  63 }
  64 mbedtls_arc4_context;
  65
  66 #else  /* MBEDTLS_ARC4_ALT */
  67 #include "arc4_alt.h"
  68 #endif /* MBEDTLS_ARC4_ALT */
  69
  70 /**
  71  * \brief          Initialize ARC4 context
  72  *
  73  * \param ctx      ARC4 context to be initialized
  74  *
  75  * \warning        ARC4 is considered a weak cipher and its use constitutes a
  76  *                 security risk. We recommend considering stronger ciphers
  77  *                 instead.
  78  *
  79  */
  80 void mbedtls_arc4_init( mbedtls_arc4_context *ctx );
  81
  82 /**
  83  * \brief          Clear ARC4 context
  84  *
  85  * \param ctx      ARC4 context to be cleared
  86  *
  87  * \warning        ARC4 is considered a weak cipher and its use constitutes a
  88  *                 security risk. We recommend considering stronger ciphers
  89  *                 instead.
  90  *
  91  */
  92 void mbedtls_arc4_free( mbedtls_arc4_context *ctx );
  93
  94 /**
  95  * \brief          ARC4 key schedule
  96  *
  97  * \param ctx      ARC4 context to be setup
  98  * \param key      the secret key
  99  * \param keylen   length of the key, in bytes
 100  *
 101  * \warning        ARC4 is considered a weak cipher and its use constitutes a
 102  *                 security risk. We recommend considering stronger ciphers
 103  *                 instead.
 104  *
 105  */
 106 void mbedtls_arc4_setup( mbedtls_arc4_context *ctx, const unsigned char *key,
 107                  unsigned int keylen );
 108
 109 /**
 110  * \brief          ARC4 cipher function
 111  *
 112  * \param ctx      ARC4 context
 113  * \param length   length of the input data
 114  * \param input    buffer holding the input data
 115  * \param output   buffer for the output data
 116  *
 117  * \return         0 if successful
 118  *
 119  * \warning        ARC4 is considered a weak cipher and its use constitutes a
 120  *                 security risk. We recommend considering stronger ciphers
 121  *                 instead.
 122  *
 123  */
 124 int mbedtls_arc4_crypt( mbedtls_arc4_context *ctx, size_t length, const unsigned char *input,
 125                 unsigned char *output );
 126
 127 /**
 128  * \brief          Checkup routine
 129  *
 130  * \return         0 if successful, or 1 if the test failed
 131  *
 132  * \warning        ARC4 is considered a weak cipher and its use constitutes a
 133  *                 security risk. We recommend considering stronger ciphers
 134  *                 instead.
 135  *
 136  */
 137 int mbedtls_arc4_self_test( int verbose );
 138
 139 #ifdef __cplusplus
 140 }
 141 #endif
 142
 143 #endif /* arc4.h */