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/*
* $Source$
* $Author$
* $Locker$
*
* Copyright 1988,1990 by the Massachusetts Institute of Technology.
*
* For copying and distribution information, please see the file
* <krb5/copyright.h>.
*
* This routine calculates an effective Key schedule set of
* permutations for des. Beginning with the pre-defined key schedule
* algorithm, it reduces it to a set of 16 permutations upon the
* initial key. Only needs to execute once to produce a header file.
* Note that we subtract one from the values ouput to fix up for C
* subscripts starting at 0.
*/
#include <krb5/copyright.h>
#include <krb5/krb5.h>
#include <stdio.h>
#include "des_int.h"
#ifndef lint
static char rcsid_make_kp[]=
"$Id$";
#endif /* lint */
char *progname;
extern int errno;
int sflag;
int vflag;
int dflag;
int pid;
int child_status;
int key_position[64+1];
int C[28+1];
int D[28+1];
int C_temp, D_temp;
/*
* CONVENTIONS for numbering the bits
* bit 0 ==> lsb
* L starts at bit 0
* R starts at bit 64
*
* BEWARE-- some stuff starts at 0, some at 1; perhaps some bugs still?
*/
/*
* Sequence of shifts used for the key schedule.
*/
int shift[16+1] = { 0,
1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1,
};
int pc_1[64+1] = { 0,
57,49,41,33,25,17, 9,
1,58,50,42,34,26,18,
10, 2,59,51,43,35,27,
19,11, 3,60,52,44,36,
63,55,47,39,31,23,15,
7,62,54,46,38,30,22,
14, 6,61,53,45,37,29,
21,13, 5,28,20,12, 4,
};
/*
* Permuted-choice 2, to pick out the bits from
* the CD array that generate the key schedule.
*/
int pc_2[48+1] = { 0,
14,17,11,24, 1, 5,
3,28,15, 6,21,10,
23,19,12, 4,26, 8,
16, 7,27,20,13, 2,
41,52,31,37,47,55,
30,40,51,45,33,48,
44,49,39,56,34,53,
46,42,50,36,29,32,
};
int ks_perm[16+1][48+1];
int mit_des_debug;
void gen(stream)
FILE *stream;
{
/* Local Declarations */
register i, j, iter;
/*
* initialize the key_position array s.t. key_position[i] = i;
* that is, each element is equal to its starting position.
*
* Also adjust for the bit order within bytes.
*/
for (i=0; i<65; i++)
key_position[i]= swap_bit_pos_1(i);
fprintf(stream,"static int const key_perm[16][48] = {\n");
/*
* apply pc_1 to initial key_position to create C[0] and D[0]
* Start at pc_1[1], not pc_1[0]
*/
for (i=1; i<=28; i++) {
C[i] = key_position[pc_1[i]];
D[i] = key_position[pc_1[i+28]];
}
/*
* major loop over the 16 iterations
* start at iter = 1, not zero.
*/
for (iter = 1; iter <= 16; iter++) {
if (mit_des_debug) {
/* for debugging */
printf(
"/* DEBUG-- start iteration = %d shifts = %d",
iter, shift[iter]);
printf("\nC array");
for (i = 1; i <=4 ; i++) {
printf("\n");
for (j = 1; j<=7; j++)
printf("%d, ",C[(i-1)*7+j]);
}
printf("\n\nD array");
for (i = 1; i <=4 ; i++) {
printf("\n");
for (j = 1; j<=7; j++)
printf("%d, ",D[(i-1)*7+j]);
}
printf("\n */");
fflush(stdout);
}
/* apply the appropriate left shifts */
for (i = 1; i <= shift[iter]; i++) {
C_temp = C[1];
D_temp = D[1];
for (j =1; j<=27; j++) {
C[j] = C[j+1];
D[j] = D[j+1];
}
C[j] = C_temp;
D[j] = D_temp;
}
if (mit_des_debug) {
/* for debugging */
printf("/* DEBUG:\n");
printf(" * after shifts, iteration = %d shifts = %d",
iter, shift[iter]);
printf("\nC array");
for (i = 1; i <=4 ; i++) {
printf("\n");
for (j = 1; j<=7; j++)
printf("%d, ",C[(i-1)*7+j]);
}
printf("\n\nD array");
for (i = 1; i <=4 ; i++) {
printf("\n");
for (j = 1; j<=7; j++)
printf("%d, ",D[(i-1)*7+j]);
}
printf("\n */");
fflush(stdout);
}
/*
* apply pc_2
* Start at pc_2[1], not pc_2[0]
*
* Start stuffing ks_perm[1][1], not ks_perm[0][0]
*
* Adjust ks_perm for bit order if needed.
*/
for (i = 1; i <= 48; i++) {
if (pc_2[i] <= 28)
ks_perm[iter][(i)] = C[pc_2[i]];
else
ks_perm[iter][(i)] = D[pc_2[i]-28];
}
/* now output the resulting key permutation */
fprintf(stream, " /* ks permutation iteration = %2d */",
iter);
for (i = 1; i <= 6; i++) {
fprintf(stream, "\n ");
for (j = 1; j <= 8; j++) {
/*
* IMPORTANT -- subtract one from value to adjust to a
* zero-based subscript for key
*/
fprintf(stream, "%d", ks_perm[iter][(i-1)*8+j]-1);
/* omit last comma */
if ((j != 8) || (i != 6) || (iter != 16)) {
fprintf(stream,", ");
}
}
}
}
fprintf(stream,"\n};\n");
}
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