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