mirror of
https://github.com/libretro/scummvm.git
synced 2024-12-30 14:14:43 +00:00
366 lines
9.2 KiB
C++
366 lines
9.2 KiB
C++
/* ScummVM - Scumm Interpreter
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* Copyright (C) 2002-2005 The ScummVM project
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (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
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* $Header$
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*/
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/*
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* RFC 1321 compliant MD5 implementation,
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* by Christophe Devine <devine(at)cr0.net>
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* this program is licensed under the GPL.
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*/
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#include <string.h>
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#include "common/file.h"
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#include "common/md5.h"
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#include "common/util.h"
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#define GET_UINT32(n,b,i) (n) = READ_LE_UINT32(b + i)
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#define PUT_UINT32(n,b,i) WRITE_LE_UINT32(b + i, n)
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void md5_starts( md5_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 md5_process( md5_context *ctx, const uint8 data[64] )
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{
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uint32 X[16], A, B, C, D;
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GET_UINT32( X[0], data, 0 );
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GET_UINT32( X[1], data, 4 );
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GET_UINT32( X[2], data, 8 );
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GET_UINT32( X[3], data, 12 );
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GET_UINT32( X[4], data, 16 );
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GET_UINT32( X[5], data, 20 );
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GET_UINT32( X[6], data, 24 );
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GET_UINT32( X[7], data, 28 );
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GET_UINT32( X[8], data, 32 );
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GET_UINT32( X[9], data, 36 );
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GET_UINT32( X[10], data, 40 );
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GET_UINT32( X[11], data, 44 );
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GET_UINT32( X[12], data, 48 );
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GET_UINT32( X[13], data, 52 );
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GET_UINT32( X[14], data, 56 );
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GET_UINT32( X[15], data, 60 );
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#define S(x,n) ((x << n) | ((x & 0xFFFFFFFF) >> (32 - n)))
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#define P(a,b,c,d,k,s,t) \
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{ \
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a += F(b,c,d) + X[k] + t; a = S(a,s) + b; \
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}
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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) (z ^ (x & (y ^ z)))
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P( A, B, C, D, 0, 7, 0xD76AA478 );
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P( D, A, B, C, 1, 12, 0xE8C7B756 );
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P( C, D, A, B, 2, 17, 0x242070DB );
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P( B, C, D, A, 3, 22, 0xC1BDCEEE );
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P( A, B, C, D, 4, 7, 0xF57C0FAF );
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P( D, A, B, C, 5, 12, 0x4787C62A );
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P( C, D, A, B, 6, 17, 0xA8304613 );
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P( B, C, D, A, 7, 22, 0xFD469501 );
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P( A, B, C, D, 8, 7, 0x698098D8 );
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P( D, A, B, C, 9, 12, 0x8B44F7AF );
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P( C, D, A, B, 10, 17, 0xFFFF5BB1 );
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P( B, C, D, A, 11, 22, 0x895CD7BE );
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P( A, B, C, D, 12, 7, 0x6B901122 );
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P( D, A, B, C, 13, 12, 0xFD987193 );
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P( C, D, A, B, 14, 17, 0xA679438E );
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P( B, C, D, A, 15, 22, 0x49B40821 );
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#undef F
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#define F(x,y,z) (y ^ (z & (x ^ y)))
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P( A, B, C, D, 1, 5, 0xF61E2562 );
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P( D, A, B, C, 6, 9, 0xC040B340 );
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P( C, D, A, B, 11, 14, 0x265E5A51 );
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P( B, C, D, A, 0, 20, 0xE9B6C7AA );
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P( A, B, C, D, 5, 5, 0xD62F105D );
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P( D, A, B, C, 10, 9, 0x02441453 );
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P( C, D, A, B, 15, 14, 0xD8A1E681 );
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P( B, C, D, A, 4, 20, 0xE7D3FBC8 );
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P( A, B, C, D, 9, 5, 0x21E1CDE6 );
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P( D, A, B, C, 14, 9, 0xC33707D6 );
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P( C, D, A, B, 3, 14, 0xF4D50D87 );
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P( B, C, D, A, 8, 20, 0x455A14ED );
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P( A, B, C, D, 13, 5, 0xA9E3E905 );
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P( D, A, B, C, 2, 9, 0xFCEFA3F8 );
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P( C, D, A, B, 7, 14, 0x676F02D9 );
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P( B, C, D, A, 12, 20, 0x8D2A4C8A );
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#undef F
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#define F(x,y,z) (x ^ y ^ z)
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P( A, B, C, D, 5, 4, 0xFFFA3942 );
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P( D, A, B, C, 8, 11, 0x8771F681 );
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P( C, D, A, B, 11, 16, 0x6D9D6122 );
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P( B, C, D, A, 14, 23, 0xFDE5380C );
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P( A, B, C, D, 1, 4, 0xA4BEEA44 );
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P( D, A, B, C, 4, 11, 0x4BDECFA9 );
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P( C, D, A, B, 7, 16, 0xF6BB4B60 );
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P( B, C, D, A, 10, 23, 0xBEBFBC70 );
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P( A, B, C, D, 13, 4, 0x289B7EC6 );
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P( D, A, B, C, 0, 11, 0xEAA127FA );
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P( C, D, A, B, 3, 16, 0xD4EF3085 );
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P( B, C, D, A, 6, 23, 0x04881D05 );
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P( A, B, C, D, 9, 4, 0xD9D4D039 );
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P( D, A, B, C, 12, 11, 0xE6DB99E5 );
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P( C, D, A, B, 15, 16, 0x1FA27CF8 );
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P( B, C, D, A, 2, 23, 0xC4AC5665 );
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#undef F
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#define F(x,y,z) (y ^ (x | ~z))
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P( A, B, C, D, 0, 6, 0xF4292244 );
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P( D, A, B, C, 7, 10, 0x432AFF97 );
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P( C, D, A, B, 14, 15, 0xAB9423A7 );
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P( B, C, D, A, 5, 21, 0xFC93A039 );
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P( A, B, C, D, 12, 6, 0x655B59C3 );
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P( D, A, B, C, 3, 10, 0x8F0CCC92 );
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P( C, D, A, B, 10, 15, 0xFFEFF47D );
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P( B, C, D, A, 1, 21, 0x85845DD1 );
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P( A, B, C, D, 8, 6, 0x6FA87E4F );
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P( D, A, B, C, 15, 10, 0xFE2CE6E0 );
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P( C, D, A, B, 6, 15, 0xA3014314 );
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P( B, C, D, A, 13, 21, 0x4E0811A1 );
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P( A, B, C, D, 4, 6, 0xF7537E82 );
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P( D, A, B, C, 11, 10, 0xBD3AF235 );
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P( C, D, A, B, 2, 15, 0x2AD7D2BB );
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P( B, C, D, A, 9, 21, 0xEB86D391 );
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#undef F
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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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void md5_update( md5_context *ctx, const uint8 *input, uint32 length )
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{
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uint32 left, fill;
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if( ! length ) return;
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left = ctx->total[0] & 0x3F;
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fill = 64 - left;
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ctx->total[0] += length;
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ctx->total[0] &= 0xFFFFFFFF;
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if( ctx->total[0] < length )
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ctx->total[1]++;
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if( left && length >= fill )
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{
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memcpy( (void *) (ctx->buffer + left),
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(const void *) input, fill );
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md5_process( ctx, ctx->buffer );
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length -= fill;
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input += fill;
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left = 0;
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}
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while( length >= 64 )
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{
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md5_process( ctx, input );
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length -= 64;
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input += 64;
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}
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if( length )
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{
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memcpy( (void *) (ctx->buffer + left),
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(const void *) input, length );
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}
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}
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static const uint8 md5_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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void md5_finish( md5_context *ctx, uint8 digest[16] )
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{
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uint32 last, padn;
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uint32 high, low;
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uint8 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( low, msglen, 0 );
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PUT_UINT32( 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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md5_update( ctx, md5_padding, padn );
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md5_update( ctx, msglen, 8 );
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PUT_UINT32( ctx->state[0], digest, 0 );
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PUT_UINT32( ctx->state[1], digest, 4 );
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PUT_UINT32( ctx->state[2], digest, 8 );
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PUT_UINT32( ctx->state[3], digest, 12 );
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}
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bool md5_file( const char *name, uint8 digest[16], const char *directory, uint32 length )
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{
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File f;
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md5_context ctx;
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int i;
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unsigned char buf[1000];
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bool restricted = (length != 0);
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int readlen;
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f.open(name, File::kFileReadMode, directory);
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if( ! f.isOpen() )
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{
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warning( "md5_file couldn't open '%s'", name );
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return false;
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}
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if( ! restricted || sizeof( buf ) <= length )
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readlen = sizeof( buf );
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else
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readlen = length;
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md5_starts( &ctx );
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while( ( i = f.read( buf, readlen ) ) > 0 )
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{
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md5_update( &ctx, buf, i );
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length -= i;
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if( restricted && length == 0 )
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break;
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if( restricted && sizeof( buf ) > length )
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readlen = length;
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}
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md5_finish( &ctx, digest );
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return true;
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}
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#ifdef TEST
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#include <stdlib.h>
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#include <stdio.h>
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/*
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* those are the standard RFC 1321 test vectors
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*/
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static const char *msg[] =
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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 char *val[] =
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{
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"d41d8cd98f00b204e9800998ecf8427e",
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"0cc175b9c0f1b6a831c399e269772661",
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"900150983cd24fb0d6963f7d28e17f72",
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"f96b697d7cb7938d525a2f31aaf161d0",
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"c3fcd3d76192e4007dfb496cca67e13b",
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"d174ab98d277d9f5a5611c2c9f419d9f",
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"57edf4a22be3c955ac49da2e2107b67a"
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};
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int main( int argc, char *argv[] )
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{
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int i, j;
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char output[33];
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md5_context ctx;
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unsigned char md5sum[16];
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if( argc < 2 )
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{
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printf( "\n MD5 Validation Tests:\n\n" );
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for( i = 0; i < 7; i++ )
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{
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printf( " Test %d ", i + 1 );
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md5_starts( &ctx );
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md5_update( &ctx, (const uint8 *) msg[i], strlen( msg[i] ) );
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md5_finish( &ctx, md5sum );
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for( j = 0; j < 16; j++ )
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{
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sprintf( output + j * 2, "%02x", md5sum[j] );
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}
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if( memcmp( output, val[i], 32 ) )
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{
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printf( "failed!\n" );
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return( 1 );
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}
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printf( "passed.\n" );
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}
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printf( "\n" );
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}
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else
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{
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for( i = 1; i < argc; i++ )
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{
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md5_file( argv[i], md5sum );
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for( j = 0; j < 16; j++ )
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{
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printf( "%02x", md5sum[j] );
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}
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printf( " %s\n", argv[i] );
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}
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}
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return( 0 );
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}
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#endif
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