reactos/lib/rtl/encode.c

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/* COPYRIGHT: See COPYING in the top level directory
* PROJECT: ReactOS system libraries
* PURPOSE: Security descriptor functions
* FILE: lib/rtl/encode.c
* PROGRAMMER: KJK::Hyperion <noog@libero.it>
* (code contributed by crazylord <crazyl0rd@minithins.net>)
*/
/* INCLUDES *****************************************************************/
#include <rtl.h>
#define NDEBUG
#include <debug.h>
/* FUNCTIONS ***************************************************************/
VOID NTAPI
RtlRunDecodeUnicodeString (IN UCHAR Hash,
IN OUT PUNICODE_STRING String)
{
PUCHAR ptr;
USHORT i;
ptr = (PUCHAR)String->Buffer;
if (String->Length > 1)
{
for (i = String->Length; i > 1; i--)
{
ptr[i - 1] ^= ptr[i - 2] ^ Hash;
}
}
if (String->Length >= 1)
{
ptr[0] ^= Hash | (UCHAR)0x43;
}
}
VOID NTAPI
RtlRunEncodeUnicodeString (IN OUT PUCHAR Hash,
IN OUT PUNICODE_STRING String)
{
LARGE_INTEGER CurrentTime;
PUCHAR ptr;
USHORT i;
NTSTATUS Status;
ptr = (PUCHAR) String->Buffer;
if (*Hash == 0)
{
Status = NtQuerySystemTime (&CurrentTime);
if (NT_SUCCESS(Status))
{
for (i = 1; i < sizeof(LARGE_INTEGER) && (*Hash == 0); i++)
*Hash |= *(PUCHAR)(((PUCHAR)&CurrentTime) + i);
}
if (*Hash == 0)
*Hash = 1;
}
if (String->Length >= 1)
{
ptr[0] ^= (*Hash) | (UCHAR)0x43;
if (String->Length > 1)
{
for (i = 1; i < String->Length; i++)
{
ptr[i] ^= ptr[i - 1] ^ (*Hash);
}
}
}
}
/* EOF */