106 lines
1.7 KiB
C
106 lines
1.7 KiB
C
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/* Copyright (c) 1994, Microsoft Corporation, all rights reserved
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**
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** pwutil.c
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** Remote Access
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** Password handling routines
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**
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** 03/01/94 Steve Cobb
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*/
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#include <windows.h>
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#include <stdlib.h>
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#include <string.h>
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#define INCL_PWUTIL
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#include <ppputil.h>
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#define PASSWORDMAGIC 0xA5
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VOID ReverseString( CHAR* psz );
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CHAR*
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DecodePw(
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IN CHAR chSeed,
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IN OUT CHAR* pszPassword )
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/* Un-obfuscate 'pszPassword' in place.
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**
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** Returns the address of 'pszPassword'.
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*/
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{
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return EncodePw( chSeed, pszPassword );
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}
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CHAR*
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EncodePw(
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IN CHAR chSeed,
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IN OUT CHAR* pszPassword )
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/* Obfuscate 'pszPassword' in place to foil memory scans for passwords.
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**
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** Returns the address of 'pszPassword'.
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*/
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{
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if (pszPassword)
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{
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CHAR* psz;
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ReverseString( pszPassword );
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for (psz = pszPassword; *psz != '\0'; ++psz)
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{
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if (*psz != chSeed)
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*psz ^= chSeed;
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/*
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if (*psz != (CHAR)PASSWORDMAGIC)
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*psz ^= PASSWORDMAGIC;
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*/
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}
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}
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return pszPassword;
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}
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VOID
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ReverseString(
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CHAR* psz )
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/* Reverses order of characters in 'psz'.
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*/
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{
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CHAR* pszBegin;
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CHAR* pszEnd;
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for (pszBegin = psz, pszEnd = psz + strlen( psz ) - 1;
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pszBegin < pszEnd;
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++pszBegin, --pszEnd)
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{
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CHAR ch = *pszBegin;
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*pszBegin = *pszEnd;
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*pszEnd = ch;
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}
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}
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CHAR*
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WipePw(
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IN OUT CHAR* pszPassword )
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/* Zero out the memory occupied by a password.
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**
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** Returns the address of 'pszPassword'.
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*/
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{
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if (pszPassword)
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{
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CHAR* psz = pszPassword;
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while (*psz != '\0')
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*psz++ = '\0';
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}
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return pszPassword;
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}
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