281 lines
7.9 KiB
C
281 lines
7.9 KiB
C
/*
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* RFC 1186/1320 compliant MD4 implementation
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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 MD4 algorithm was designed by Ron Rivest in 1990.
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*
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* http://www.ietf.org/rfc/rfc1186.txt
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* http://www.ietf.org/rfc/rfc1320.txt
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*/
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#include "lwip/opt.h"
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#if PPP_SUPPORT && LWIP_INCLUDED_POLARSSL_MD4
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#include "netif/ppp/polarssl/md4.h"
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#include <string.h>
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/*
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* 32-bit integer manipulation macros (little endian)
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*/
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#ifndef GET_ULONG_LE
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#define GET_ULONG_LE(n,b,i) \
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{ \
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(n) = ( (unsigned long) (b)[(i) ] ) \
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| ( (unsigned long) (b)[(i) + 1] << 8 ) \
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| ( (unsigned long) (b)[(i) + 2] << 16 ) \
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| ( (unsigned long) (b)[(i) + 3] << 24 ); \
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}
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#endif
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#ifndef PUT_ULONG_LE
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#define PUT_ULONG_LE(n,b,i) \
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{ \
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(b)[(i) ] = (unsigned char) ( (n) ); \
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(b)[(i) + 1] = (unsigned char) ( (n) >> 8 ); \
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(b)[(i) + 2] = (unsigned char) ( (n) >> 16 ); \
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(b)[(i) + 3] = (unsigned char) ( (n) >> 24 ); \
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}
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#endif
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/*
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* MD4 context setup
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*/
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void md4_starts( md4_context *ctx )
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{
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ctx->total[0] = 0;
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ctx->total[1] = 0;
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ctx->state[0] = 0x67452301;
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ctx->state[1] = 0xEFCDAB89;
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ctx->state[2] = 0x98BADCFE;
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ctx->state[3] = 0x10325476;
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}
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static void md4_process( md4_context *ctx, const unsigned char data[64] )
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{
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unsigned long X[16], A, B, C, D;
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GET_ULONG_LE( X[ 0], data, 0 );
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GET_ULONG_LE( X[ 1], data, 4 );
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GET_ULONG_LE( X[ 2], data, 8 );
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GET_ULONG_LE( X[ 3], data, 12 );
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GET_ULONG_LE( X[ 4], data, 16 );
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GET_ULONG_LE( X[ 5], data, 20 );
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GET_ULONG_LE( X[ 6], data, 24 );
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GET_ULONG_LE( X[ 7], data, 28 );
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GET_ULONG_LE( X[ 8], data, 32 );
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GET_ULONG_LE( X[ 9], data, 36 );
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GET_ULONG_LE( X[10], data, 40 );
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GET_ULONG_LE( X[11], data, 44 );
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GET_ULONG_LE( X[12], data, 48 );
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GET_ULONG_LE( X[13], data, 52 );
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GET_ULONG_LE( X[14], data, 56 );
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GET_ULONG_LE( X[15], data, 60 );
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#define S(x,n) ((x << n) | ((x & 0xFFFFFFFF) >> (32 - n)))
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A = ctx->state[0];
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B = ctx->state[1];
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C = ctx->state[2];
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D = ctx->state[3];
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#define F(x, y, z) ((x & y) | ((~x) & z))
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#define P(a,b,c,d,x,s) { a += F(b,c,d) + x; a = S(a,s); }
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P( A, B, C, D, X[ 0], 3 );
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P( D, A, B, C, X[ 1], 7 );
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P( C, D, A, B, X[ 2], 11 );
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P( B, C, D, A, X[ 3], 19 );
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P( A, B, C, D, X[ 4], 3 );
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P( D, A, B, C, X[ 5], 7 );
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P( C, D, A, B, X[ 6], 11 );
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P( B, C, D, A, X[ 7], 19 );
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P( A, B, C, D, X[ 8], 3 );
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P( D, A, B, C, X[ 9], 7 );
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P( C, D, A, B, X[10], 11 );
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P( B, C, D, A, X[11], 19 );
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P( A, B, C, D, X[12], 3 );
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P( D, A, B, C, X[13], 7 );
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P( C, D, A, B, X[14], 11 );
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P( B, C, D, A, X[15], 19 );
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#undef P
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#undef F
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#define F(x,y,z) ((x & y) | (x & z) | (y & z))
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#define P(a,b,c,d,x,s) { a += F(b,c,d) + x + 0x5A827999; a = S(a,s); }
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P( A, B, C, D, X[ 0], 3 );
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P( D, A, B, C, X[ 4], 5 );
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P( C, D, A, B, X[ 8], 9 );
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P( B, C, D, A, X[12], 13 );
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P( A, B, C, D, X[ 1], 3 );
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P( D, A, B, C, X[ 5], 5 );
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P( C, D, A, B, X[ 9], 9 );
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P( B, C, D, A, X[13], 13 );
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P( A, B, C, D, X[ 2], 3 );
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P( D, A, B, C, X[ 6], 5 );
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P( C, D, A, B, X[10], 9 );
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P( B, C, D, A, X[14], 13 );
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P( A, B, C, D, X[ 3], 3 );
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P( D, A, B, C, X[ 7], 5 );
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P( C, D, A, B, X[11], 9 );
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P( B, C, D, A, X[15], 13 );
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#undef P
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#undef F
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#define F(x,y,z) (x ^ y ^ z)
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#define P(a,b,c,d,x,s) { a += F(b,c,d) + x + 0x6ED9EBA1; a = S(a,s); }
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P( A, B, C, D, X[ 0], 3 );
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P( D, A, B, C, X[ 8], 9 );
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P( C, D, A, B, X[ 4], 11 );
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P( B, C, D, A, X[12], 15 );
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P( A, B, C, D, X[ 2], 3 );
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P( D, A, B, C, X[10], 9 );
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P( C, D, A, B, X[ 6], 11 );
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P( B, C, D, A, X[14], 15 );
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P( A, B, C, D, X[ 1], 3 );
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P( D, A, B, C, X[ 9], 9 );
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P( C, D, A, B, X[ 5], 11 );
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P( B, C, D, A, X[13], 15 );
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P( A, B, C, D, X[ 3], 3 );
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P( D, A, B, C, X[11], 9 );
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P( C, D, A, B, X[ 7], 11 );
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P( B, C, D, A, X[15], 15 );
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#undef F
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#undef P
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ctx->state[0] += A;
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ctx->state[1] += B;
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ctx->state[2] += C;
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ctx->state[3] += D;
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}
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/*
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* MD4 process buffer
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*/
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void md4_update( md4_context *ctx, const unsigned char *input, int ilen )
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{
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int fill;
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unsigned long left;
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if( ilen <= 0 )
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return;
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left = ctx->total[0] & 0x3F;
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fill = 64 - left;
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ctx->total[0] += ilen;
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ctx->total[0] &= 0xFFFFFFFF;
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if( ctx->total[0] < (unsigned long) ilen )
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ctx->total[1]++;
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if( left && ilen >= fill )
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{
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MEMCPY( (void *) (ctx->buffer + left),
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input, fill );
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md4_process( ctx, ctx->buffer );
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input += fill;
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ilen -= fill;
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left = 0;
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}
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while( ilen >= 64 )
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{
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md4_process( ctx, input );
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input += 64;
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ilen -= 64;
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}
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if( ilen > 0 )
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{
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MEMCPY( (void *) (ctx->buffer + left),
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input, ilen );
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}
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}
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static const unsigned char md4_padding[64] =
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{
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0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
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};
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/*
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* MD4 final digest
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*/
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void md4_finish( md4_context *ctx, unsigned char output[16] )
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{
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unsigned long last, padn;
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unsigned long high, low;
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unsigned char msglen[8];
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high = ( ctx->total[0] >> 29 )
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| ( ctx->total[1] << 3 );
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low = ( ctx->total[0] << 3 );
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PUT_ULONG_LE( low, msglen, 0 );
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PUT_ULONG_LE( high, msglen, 4 );
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last = ctx->total[0] & 0x3F;
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padn = ( last < 56 ) ? ( 56 - last ) : ( 120 - last );
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md4_update( ctx, md4_padding, padn );
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md4_update( ctx, msglen, 8 );
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PUT_ULONG_LE( ctx->state[0], output, 0 );
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PUT_ULONG_LE( ctx->state[1], output, 4 );
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PUT_ULONG_LE( ctx->state[2], output, 8 );
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PUT_ULONG_LE( ctx->state[3], output, 12 );
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}
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/*
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* output = MD4( input buffer )
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*/
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void md4( unsigned char *input, int ilen, unsigned char output[16] )
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{
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md4_context ctx;
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md4_starts( &ctx );
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md4_update( &ctx, input, ilen );
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md4_finish( &ctx, output );
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}
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#endif /* PPP_SUPPORT && LWIP_INCLUDED_POLARSSL_MD4 */
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