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C/C++ code:
void permute(unsigned char *inblock,
unsigned char perm[16][16][8],/* 2K bytes defining perm. */
unsigned char *outblock)
{
register int i,j;
register char *ib, *ob, *p, *q;
for(i=0, ob=outblock; i<8; i++) *ob++ = 0; /* clear output block */
ib = inblock;
for (j = 0; j < 16; j += 2, ib++) { /* for each input nibble */
ob = outblock;
p = perm[j][(*ib >> 4) & 0xf];
q = perm[j + 1][*ib & 0xf];
for (i = 0; i < 8; i++) /* and each output byte */
*ob++ |= *p++ | *q++; /* OR the masks together*/
}
}
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C/C++ code:
void CDecipher::permute(unsigned char *inblock,unsigned char perm[16][16][8],unsigned char *outblock)
{
register int i,j;
register char *ib, *ob, *p, *q;
for(i=0, ob=outb
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