2 * Copyright 1985, 1988 by the Massachusetts Institute of Technology.
4 * For copying and distribution information, please
5 * see the file <mit-cpyright.h>.
9 #include <mit-cpyright.h>
11 #include "des_internal.h"
14 extern afs_uint32 swap_byte_bits();
15 extern afs_uint32 rev_swap_bit_pos_0();
16 static unsigned char P_temp[32];
17 static afs_uint32 P_prime[4][256];
23 /* P permutes 32 bit input R1 into 32 bit output R2 */
26 /* flip p into p_temp */
27 for (i = 0; i<32; i++)
28 P_temp[P[rev_swap_bit_pos_0(i)]] = rev_swap_bit_pos_0(i);
31 * now for each byte of input, figure out all possible combinations
33 for (i = 0; i <4 ; i ++) { /* each input byte */
34 for (j = 0; j<256; j++) { /* each possible byte value */
37 /* swap_byte_bits(j); */
38 for (m = 0; m < 8; m++) { /* each bit */
40 /* set output values */
41 P_prime[i][j] |= 1 << P_temp[(i*8)+m];
48 "\n\tstatic afs_uint32 const P_prime[4][256] = {\n\t");
49 for (i = 0; i < 4; i++) {
51 for (j = 0; j < 64; j++) {
53 for (k = 0; k < 4; k++) {
54 fprintf(stream,"0x%08X",P_prime[i][j*4+k]);
55 if ((i == 3) && (j == 63) && (k == 3))
56 fprintf(stream,"\n};");