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PPP, MPPE, import unmodified ARC4 from polarssl
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src/include/netif/ppp/polarssl/arc4.h
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82
src/include/netif/ppp/polarssl/arc4.h
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/**
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* \file arc4.h
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*
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* Based on XySSL: Copyright (C) 2006-2008 Christophe Devine
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*
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* Copyright (C) 2009 Paul Bakker <polarssl_maintainer at polarssl dot org>
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the names of PolarSSL or XySSL nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef POLARSSL_ARC4_H
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#define POLARSSL_ARC4_H
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/**
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* \brief ARC4 context structure
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*/
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typedef struct
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{
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int x; /*!< permutation index */
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int y; /*!< permutation index */
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unsigned char m[256]; /*!< permutation table */
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}
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arc4_context;
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* \brief ARC4 key schedule
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*
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* \param ctx ARC4 context to be initialized
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* \param key the secret key
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* \param keylen length of the key
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*/
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void arc4_setup( arc4_context *ctx, unsigned char *key, int keylen );
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/**
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* \brief ARC4 cipher function
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*
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* \param ctx ARC4 context
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* \param buf buffer to be processed
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* \param buflen amount of data in buf
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*/
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void arc4_crypt( arc4_context *ctx, unsigned char *buf, int buflen );
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/*
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* \brief Checkup routine
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*
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* \return 0 if successful, or 1 if the test failed
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*/
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int arc4_self_test( int verbose );
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#ifdef __cplusplus
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}
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#endif
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#endif /* arc4.h */
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173
src/netif/ppp/polarssl/arc4.c
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173
src/netif/ppp/polarssl/arc4.c
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/*
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* An implementation of the ARCFOUR algorithm
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*
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* Based on XySSL: Copyright (C) 2006-2008 Christophe Devine
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*
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* Copyright (C) 2009 Paul Bakker <polarssl_maintainer at polarssl dot org>
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the names of PolarSSL or XySSL nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* The ARCFOUR algorithm was publicly disclosed on 94/09.
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*
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* http://groups.google.com/group/sci.crypt/msg/10a300c9d21afca0
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*/
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#include "polarssl/config.h"
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#if defined(POLARSSL_ARC4_C)
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#include "polarssl/arc4.h"
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/*
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* ARC4 key schedule
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*/
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void arc4_setup( arc4_context *ctx, unsigned char *key, int keylen )
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{
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int i, j, k, a;
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unsigned char *m;
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ctx->x = 0;
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ctx->y = 0;
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m = ctx->m;
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for( i = 0; i < 256; i++ )
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m[i] = (unsigned char) i;
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j = k = 0;
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for( i = 0; i < 256; i++, k++ )
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{
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if( k >= keylen ) k = 0;
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a = m[i];
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j = ( j + a + key[k] ) & 0xFF;
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m[i] = m[j];
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m[j] = (unsigned char) a;
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}
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}
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/*
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* ARC4 cipher function
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*/
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void arc4_crypt( arc4_context *ctx, unsigned char *buf, int buflen )
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{
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int i, x, y, a, b;
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unsigned char *m;
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x = ctx->x;
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y = ctx->y;
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m = ctx->m;
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for( i = 0; i < buflen; i++ )
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{
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x = ( x + 1 ) & 0xFF; a = m[x];
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y = ( y + a ) & 0xFF; b = m[y];
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m[x] = (unsigned char) b;
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m[y] = (unsigned char) a;
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buf[i] = (unsigned char)
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( buf[i] ^ m[(unsigned char)( a + b )] );
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}
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ctx->x = x;
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ctx->y = y;
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}
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#if defined(POLARSSL_SELF_TEST)
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#include <string.h>
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#include <stdio.h>
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/*
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* ARC4 tests vectors as posted by Eric Rescorla in sep. 1994:
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*
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* http://groups.google.com/group/comp.security.misc/msg/10a300c9d21afca0
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*/
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static const unsigned char arc4_test_key[3][8] =
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{
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{ 0x01, 0x23, 0x45, 0x67, 0x89, 0xAB, 0xCD, 0xEF },
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{ 0x01, 0x23, 0x45, 0x67, 0x89, 0xAB, 0xCD, 0xEF },
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{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }
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};
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static const unsigned char arc4_test_pt[3][8] =
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{
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{ 0x01, 0x23, 0x45, 0x67, 0x89, 0xAB, 0xCD, 0xEF },
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{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
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{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }
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};
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static const unsigned char arc4_test_ct[3][8] =
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{
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{ 0x75, 0xB7, 0x87, 0x80, 0x99, 0xE0, 0xC5, 0x96 },
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{ 0x74, 0x94, 0xC2, 0xE7, 0x10, 0x4B, 0x08, 0x79 },
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{ 0xDE, 0x18, 0x89, 0x41, 0xA3, 0x37, 0x5D, 0x3A }
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};
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/*
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* Checkup routine
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*/
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int arc4_self_test( int verbose )
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{
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int i;
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unsigned char buf[8];
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arc4_context ctx;
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for( i = 0; i < 3; i++ )
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{
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if( verbose != 0 )
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printf( " ARC4 test #%d: ", i + 1 );
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memcpy( buf, arc4_test_pt[i], 8 );
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arc4_setup( &ctx, (unsigned char *) arc4_test_key[i], 8 );
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arc4_crypt( &ctx, buf, 8 );
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if( memcmp( buf, arc4_test_ct[i], 8 ) != 0 )
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{
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if( verbose != 0 )
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printf( "failed\n" );
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return( 1 );
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}
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if( verbose != 0 )
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printf( "passed\n" );
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}
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if( verbose != 0 )
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printf( "\n" );
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return( 0 );
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}
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#endif
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#endif
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