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/*
* $Source$
* $Author$
*
* Copyright 1985, 1988, 1990 by the Massachusetts Institute of Technology.
*
* For copying and distribution information, please see the file
* <krb5/copyright.h>.
*
*/
#include <krb5/copyright.h>
#include <krb5/krb5.h>
#include <stdio.h>
#include "des_int.h"
#include "tables.h"
static unsigned char P_temp[32];
static unsigned long P_prime[4][256];
void gen(stream)
FILE *stream;
{
register i,j,k,m;
/* P permutes 32 bit input R1 into 32 bit output R2 */
#ifdef BIG
/* flip p into p_temp */
for (i = 0; i<32; i++)
P_temp[P[rev_swap_bit_pos_0(i)]] = rev_swap_bit_pos_0(i);
/*
* now for each byte of input, figure out all possible combinations
*/
for (i = 0; i <4 ; i ++) { /* each input byte */
for (j = 0; j<256; j++) { /* each possible byte value */
/* flip bit order */
k = j;
/* swap_byte_bits(j); */
for (m = 0; m < 8; m++) { /* each bit */
if (k & (1 << m)) {
/* set output values */
P_prime[i][j] |= 1 << P_temp[(i*8)+m];
}
}
}
}
fprintf(stream,
"\n\tstatic unsigned long const P_prime[4][256] = {\n\t");
for (i = 0; i < 4; i++) {
fprintf(stream,"\n");
for (j = 0; j < 64; j++) {
fprintf(stream,"\n");
for (k = 0; k < 4; k++) {
fprintf(stream,"0x%08X",P_prime[i][j*4+k]);
if ((i == 3) && (j == 63) && (k == 3))
fprintf(stream,"\n};");
else
fprintf(stream,", ");
}
}
}
#endif
fprintf(stream,"\n");
}
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