1bd3ae826c
process functions Access to process functions is needed to reduce possible timing attacks on SSL MAC checks. As SSL is set to move to using the dynamic MD layer, the MD layer needs access to these process functions as well.
461 lines
11 KiB
C
461 lines
11 KiB
C
/*
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* RFC 1186/1320 compliant MD4 implementation
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*
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* Copyright (C) 2006-2010, Brainspark B.V.
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*
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* This file is part of PolarSSL (http://www.polarssl.org)
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* Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
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*
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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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 "polarssl/config.h"
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#if defined(POLARSSL_MD4_C)
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#include "polarssl/md4.h"
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#if defined(POLARSSL_FS_IO) || defined(POLARSSL_SELF_TEST)
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#include <stdio.h>
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#endif
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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_UINT32_LE
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#define GET_UINT32_LE(n,b,i) \
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{ \
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(n) = ( (uint32_t) (b)[(i) ] ) \
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| ( (uint32_t) (b)[(i) + 1] << 8 ) \
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| ( (uint32_t) (b)[(i) + 2] << 16 ) \
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| ( (uint32_t) (b)[(i) + 3] << 24 ); \
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}
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#endif
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#ifndef PUT_UINT32_LE
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#define PUT_UINT32_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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void md4_process( md4_context *ctx, const unsigned char data[64] )
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{
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uint32_t X[16], A, B, C, D;
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GET_UINT32_LE( X[ 0], data, 0 );
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GET_UINT32_LE( X[ 1], data, 4 );
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GET_UINT32_LE( X[ 2], data, 8 );
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GET_UINT32_LE( X[ 3], data, 12 );
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GET_UINT32_LE( X[ 4], data, 16 );
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GET_UINT32_LE( X[ 5], data, 20 );
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GET_UINT32_LE( X[ 6], data, 24 );
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GET_UINT32_LE( X[ 7], data, 28 );
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GET_UINT32_LE( X[ 8], data, 32 );
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GET_UINT32_LE( X[ 9], data, 36 );
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GET_UINT32_LE( X[10], data, 40 );
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GET_UINT32_LE( X[11], data, 44 );
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GET_UINT32_LE( X[12], data, 48 );
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GET_UINT32_LE( X[13], data, 52 );
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GET_UINT32_LE( X[14], data, 56 );
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GET_UINT32_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, size_t ilen )
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{
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size_t fill;
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uint32_t 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] += (uint32_t) ilen;
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ctx->total[0] &= 0xFFFFFFFF;
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if( ctx->total[0] < (uint32_t) 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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(void *) 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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(void *) 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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uint32_t last, padn;
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uint32_t 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_UINT32_LE( low, msglen, 0 );
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PUT_UINT32_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, (unsigned char *) md4_padding, padn );
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md4_update( ctx, msglen, 8 );
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PUT_UINT32_LE( ctx->state[0], output, 0 );
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PUT_UINT32_LE( ctx->state[1], output, 4 );
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PUT_UINT32_LE( ctx->state[2], output, 8 );
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PUT_UINT32_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( const unsigned char *input, size_t 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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memset( &ctx, 0, sizeof( md4_context ) );
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}
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#if defined(POLARSSL_FS_IO)
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/*
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* output = MD4( file contents )
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*/
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int md4_file( const char *path, unsigned char output[16] )
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{
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FILE *f;
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size_t n;
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md4_context ctx;
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unsigned char buf[1024];
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if( ( f = fopen( path, "rb" ) ) == NULL )
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return( POLARSSL_ERR_MD4_FILE_IO_ERROR );
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md4_starts( &ctx );
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while( ( n = fread( buf, 1, sizeof( buf ), f ) ) > 0 )
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md4_update( &ctx, buf, n );
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md4_finish( &ctx, output );
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memset( &ctx, 0, sizeof( md4_context ) );
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if( ferror( f ) != 0 )
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{
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fclose( f );
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return( POLARSSL_ERR_MD4_FILE_IO_ERROR );
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}
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fclose( f );
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return( 0 );
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}
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#endif /* POLARSSL_FS_IO */
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/*
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* MD4 HMAC context setup
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*/
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void md4_hmac_starts( md4_context *ctx, const unsigned char *key, size_t keylen )
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{
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size_t i;
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unsigned char sum[16];
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if( keylen > 64 )
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{
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md4( key, keylen, sum );
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keylen = 16;
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key = sum;
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}
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memset( ctx->ipad, 0x36, 64 );
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memset( ctx->opad, 0x5C, 64 );
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for( i = 0; i < keylen; i++ )
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{
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ctx->ipad[i] = (unsigned char)( ctx->ipad[i] ^ key[i] );
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ctx->opad[i] = (unsigned char)( ctx->opad[i] ^ key[i] );
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}
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md4_starts( ctx );
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md4_update( ctx, ctx->ipad, 64 );
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memset( sum, 0, sizeof( sum ) );
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}
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/*
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* MD4 HMAC process buffer
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*/
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void md4_hmac_update( md4_context *ctx, const unsigned char *input, size_t ilen )
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{
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md4_update( ctx, input, ilen );
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}
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/*
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* MD4 HMAC final digest
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*/
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void md4_hmac_finish( md4_context *ctx, unsigned char output[16] )
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{
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unsigned char tmpbuf[16];
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md4_finish( ctx, tmpbuf );
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md4_starts( ctx );
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md4_update( ctx, ctx->opad, 64 );
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md4_update( ctx, tmpbuf, 16 );
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md4_finish( ctx, output );
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memset( tmpbuf, 0, sizeof( tmpbuf ) );
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}
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/*
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* MD4 HMAC context reset
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*/
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void md4_hmac_reset( md4_context *ctx )
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{
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md4_starts( ctx );
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md4_update( ctx, ctx->ipad, 64 );
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}
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/*
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* output = HMAC-MD4( hmac key, input buffer )
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*/
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void md4_hmac( const unsigned char *key, size_t keylen,
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const unsigned char *input, size_t ilen,
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unsigned char output[16] )
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{
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md4_context ctx;
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md4_hmac_starts( &ctx, key, keylen );
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md4_hmac_update( &ctx, input, ilen );
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md4_hmac_finish( &ctx, output );
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memset( &ctx, 0, sizeof( md4_context ) );
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}
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#if defined(POLARSSL_SELF_TEST)
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/*
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* RFC 1320 test vectors
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*/
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static const char md4_test_str[7][81] =
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{
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{ "" },
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{ "a" },
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{ "abc" },
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{ "message digest" },
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{ "abcdefghijklmnopqrstuvwxyz" },
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{ "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789" },
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{ "12345678901234567890123456789012345678901234567890123456789012" \
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"345678901234567890" }
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};
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static const unsigned char md4_test_sum[7][16] =
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{
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{ 0x31, 0xD6, 0xCF, 0xE0, 0xD1, 0x6A, 0xE9, 0x31,
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0xB7, 0x3C, 0x59, 0xD7, 0xE0, 0xC0, 0x89, 0xC0 },
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{ 0xBD, 0xE5, 0x2C, 0xB3, 0x1D, 0xE3, 0x3E, 0x46,
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0x24, 0x5E, 0x05, 0xFB, 0xDB, 0xD6, 0xFB, 0x24 },
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{ 0xA4, 0x48, 0x01, 0x7A, 0xAF, 0x21, 0xD8, 0x52,
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0x5F, 0xC1, 0x0A, 0xE8, 0x7A, 0xA6, 0x72, 0x9D },
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{ 0xD9, 0x13, 0x0A, 0x81, 0x64, 0x54, 0x9F, 0xE8,
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0x18, 0x87, 0x48, 0x06, 0xE1, 0xC7, 0x01, 0x4B },
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{ 0xD7, 0x9E, 0x1C, 0x30, 0x8A, 0xA5, 0xBB, 0xCD,
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0xEE, 0xA8, 0xED, 0x63, 0xDF, 0x41, 0x2D, 0xA9 },
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{ 0x04, 0x3F, 0x85, 0x82, 0xF2, 0x41, 0xDB, 0x35,
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0x1C, 0xE6, 0x27, 0xE1, 0x53, 0xE7, 0xF0, 0xE4 },
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{ 0xE3, 0x3B, 0x4D, 0xDC, 0x9C, 0x38, 0xF2, 0x19,
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0x9C, 0x3E, 0x7B, 0x16, 0x4F, 0xCC, 0x05, 0x36 }
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};
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/*
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* Checkup routine
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*/
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int md4_self_test( int verbose )
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{
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int i;
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unsigned char md4sum[16];
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for( i = 0; i < 7; i++ )
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{
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if( verbose != 0 )
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printf( " MD4 test #%d: ", i + 1 );
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md4( (unsigned char *) md4_test_str[i],
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strlen( md4_test_str[i] ), md4sum );
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if( memcmp( md4sum, md4_test_sum[i], 16 ) != 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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