24 lines
559 B
C
24 lines
559 B
C
|
|
#define NITER 4
|
|
|
|
void psdes(lword,irword)
|
|
unsigned long *irword,*lword;
|
|
{
|
|
unsigned long i,ia,ib,iswap,itmph=0,itmpl=0;
|
|
static unsigned long c1[NITER]={
|
|
0xbaa96887L, 0x1e17d32cL, 0x03bcdc3cL, 0x0f33d1b2L};
|
|
static unsigned long c2[NITER]={
|
|
0x4b0f3b58L, 0xe874f0c3L, 0x6955c5a6L, 0x55a7ca46L};
|
|
|
|
for (i=0;i<NITER;i++) {
|
|
ia=(iswap=(*irword)) ^ c1[i];
|
|
itmpl = ia & 0xffff;
|
|
itmph = ia >> 16;
|
|
ib=itmpl*itmpl+ ~(itmph*itmph);
|
|
*irword=(*lword) ^ (((ia = (ib >> 16) |
|
|
((ib & 0xffff) << 16)) ^ c2[i])+itmpl*itmph);
|
|
*lword=iswap;
|
|
}
|
|
}
|
|
#undef NITER
|