?? psdes.c
字號:
#define NITER 4void psdes(unsigned long *lword, unsigned long *irword){ 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?? 快捷鍵說明
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