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RtlRunEncodeUnicodeString & RtlRunDecodeUnicodeString contributed by crazylord

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svn path=/trunk/; revision=4473
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KJK::Hyperion 2003-04-02 00:01:21 +00:00
parent c3a2a5dc0d
commit e379c5e0b7
1 changed files with 75 additions and 0 deletions
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reactos/lib/ntdll/rtl/encode.c Normal file
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/* $Id: encode.c,v 1.1 2003/04/02 00:01:21 hyperion Exp $
*
* COPYRIGHT: See COPYING in the top level directory
* PROJECT: ReactOS kernel
* PURPOSE: Security descriptor functions
* FILE: lib/ntdll/rtl/encode.c
* PROGRAMMER: KJK::Hyperion <noog@libero.it>
* REVISION HISTORY:
* 02/04/2003: created (code contributed by crazylord
* <crazyl0rd@minithins.net>)
*/
/* INCLUDES *****************************************************************/
#include <ddk/ntddk.h>
#include <ntdll/ntdll.h>
/* FUNCTIONS ***************************************************************/
VOID NTAPI RtlRunDecodeUnicodeString
(
IN UCHAR hash,
IN OUT PUNICODE_STRING uString
)
{
UCHAR *ptr;
WORD i;
ptr = (UCHAR *) uString->Buffer;
if (uString->Length > 1) {
for (i=uString->Length; i>1; i--) {
ptr[i-1] ^= ptr[i-2] ^ hash;
}
}
if (uString->Length >= 1) {
ptr[0] ^= hash | (UCHAR) 0x43;
}
}
VOID NTAPI RtlRunEncodeUnicodeString
(
IN OUT PUCHAR hash,
IN OUT PUNICODE_STRING uString
)
{
NTSTATUS ntS;
UCHAR *ptr;
TIME CurrentTime;
WORD i;
ptr = (UCHAR *) uString->Buffer;
if (*hash == 0) {
ntS = NtQuerySystemTime(&CurrentTime);
if (NT_SUCCESS(ntS)) {
for (i=1; i<sizeof(TIME) && (*hash == 0); i++)
*hash |= *(PUCHAR) (((PUCHAR) &CurrentTime)+i);
}
if (*hash == 0)
*hash = 1;
}
if (uString->Length >= 1) {
ptr[0] ^= (*hash) | (UCHAR) 0x43;
if (uString->Length > 1) {
for (i=1; i<uString->Length; i++) {
ptr[i] ^= ptr[i-1] ^ (*hash);
}
}
}
}
/* EOF */