Reconstruction of des.exe/undes.exe

2026-09-09 23:28:46 +02:00
parent b90136f137
commit 5aa37bf374
64 changed files with 13344 additions and 2 deletions
@@ -0,0 +1,122 @@
+/*
+ * Common support reconstructed from DES/UNDES V1.1.0 executables.
+ * Original program copyright: (C) 1998 H.N.M. Dijkema, GPL.
+ *
+ * This is reconstructed source, not the original source text.  The helper
+ * behaviour and strings below are derived directly from des.exe/undes.exe.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "des_common.h"
+
+DES_INT32 desKnownVersions[] = {
+    DES_FILE_VERSION,
+    (DES_INT32) -1
+};
+
+const char *desProgramVersion =
+    "DES/UNDES V1.1.0, (C) 1998 H.N.M. Dijkema (GPL)";
+
+const char *desCopyrightText =
+    "    Copyright (C) 1998 H.N.M. Dijkema\n"
+    "\n"
+    "    This product includes software developed by Eric Young (eay@mincom.oz.au)\n"
+    "\n"
+    "    This program is free software; you can redistribute it and/or modify\n"
+    "    it under the terms of the GNU General Public License as published by\n"
+    "    the Free Software Foundation; either version 2 of the License, or\n"
+    "    (at your option) any later version.\n"
+    "\n"
+    "    This program is distributed in the hope that it will be useful,\n"
+    "    but WITHOUT ANY WARRANTY; without even the implied warranty of\n"
+    "    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n"
+    "    GNU General Public License for more details.\n"
+    "\n"
+    "    You should have received a copy of the GNU General Public License\n"
+    "    along with this program; if not, write to the Free Software\n"
+    "    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA\n"
+    "\n"
+    "    You can contact the author by electronic mail, hnmdijkema@freemail.nl\n"
+    "\n"
+    "\n"
+    "Acknowledgements\n"
+    "----------------\n"
+    "The author of CRYPTLIB, Peter Putmann of University of Auckland\n"
+    "cryptl99.zip Free encryption library for DOS/UNIX/Windows\n"
+    "\n"
+    "The DES and 3DES encryption code was contributed by Eric Young\n"
+    "<eay@psych.psy.uq.oz.au> and is part of his libdes package.\n"
+    "The primary ftp site for the full libdes is\n"
+    "   ftp://ftp.psy.uq.oz.au/pub/Crypto/DES/libdes-x.xx.tar.gz.\n"
+    "\n";
+
+void checkRead( int result )
+{
+    if( result == -1 )
+    {
+        fprintf( stderr, "\nFATAL   : error reading input stream\n" );
+        perror( "MESSAGE " );
+        exit( 3 );
+    }
+}
+
+void checkWrite( FILE *stream )
+{
+    if( ferror( stream ) )
+    {
+        fprintf( stderr, "\nFATAL   : error writing output stream\n" );
+        perror( "MESSAGE " );
+        exit( 3 );
+    }
+}
+
+void checkOpen( FILE *stream, const char *name )
+{
+    if( stream == NULL )
+    {
+        fprintf( stderr, "\nFATAL   : Cannot open '%s'\n", name );
+        perror( "MESSAGE " );
+        exit( 3 );
+    }
+}
+
+void checkVersion( DES_INT32 version )
+{
+    int i = 0;
+
+    while( desKnownVersions[ i ] != version &&
+           desKnownVersions[ i ] != (DES_INT32) -1 )
+        i++;
+
+    if( desKnownVersions[ i ] == (DES_INT32) -1 )
+    {
+        fprintf( stderr,
+                 "I don't know the version of this file, can't decrypt this\n" );
+        exit( 1 );
+    }
+}
+
+/*
+ * The compiler output proves that the marker is formed from a signed 16-bit
+ * word: abs(word), followed by negation and sign-extension to 32 bits.
+ */
+DES_INT32 negativeMarker( const unsigned char *p )
+{
+    DES_INT16 value;
+    DES_UINT16 magnitude;
+    DES_UINT16 negated;
+
+    memcpy( &value, p, sizeof( value ) );
+
+    /* Emulate 16-bit Turbo C arithmetic exactly, including -32768. */
+    if( value < 0 )
+        magnitude = (DES_UINT16) ( -(DES_INT32) value );
+    else
+        magnitude = (DES_UINT16) value;
+
+    negated = (DES_UINT16) ( 0U - magnitude );
+    memcpy( &value, &negated, sizeof( value ) );
+    return( (DES_INT32) value );
+}