#ifdef CRYPTKIT_CSP_ENABLE
#define STATIC_PERMS 0
#else
#define STATIC_PERMS 1
#endif
#include "DES.h"
#if !STATIC_PERMS
#include <CryptKit/falloc.h>
#endif
#include <stdlib.h>
#ifndef NULL
#define NULL ((void *)0)
#endif
#define DES_DEBUG 0
#ifdef __LITTLE_ENDIAN__
static unsigned int byteswap(unsigned int x) {
register char *cp,tmp;
cp = (char *)&x;
tmp = cp[3];
cp[3] = cp[0];
cp[0] = tmp;
tmp = cp[2];
cp[2] = cp[1];
cp[1] = tmp;
return x;
}
#endif
static const char ip[] = {
58, 50, 42, 34, 26, 18, 10, 2,
60, 52, 44, 36, 28, 20, 12, 4,
62, 54, 46, 38, 30, 22, 14, 6,
64, 56, 48, 40, 32, 24, 16, 8,
57, 49, 41, 33, 25, 17, 9, 1,
59, 51, 43, 35, 27, 19, 11, 3,
61, 53, 45, 37, 29, 21, 13, 5,
63, 55, 47, 39, 31, 23, 15, 7
};
static const char fp[] = {
40, 8, 48, 16, 56, 24, 64, 32,
39, 7, 47, 15, 55, 23, 63, 31,
38, 6, 46, 14, 54, 22, 62, 30,
37, 5, 45, 13, 53, 21, 61, 29,
36, 4, 44, 12, 52, 20, 60, 28,
35, 3, 43, 11, 51, 19, 59, 27,
34, 2, 42, 10, 50, 18, 58, 26,
33, 1, 41, 9, 49, 17, 57, 25
};
#ifdef notdef
static char ei[] = {
32, 1, 2, 3, 4, 5,
4, 5, 6, 7, 8, 9,
8, 9, 10, 11, 12, 13,
12, 13, 14, 15, 16, 17,
16, 17, 18, 19, 20, 21,
20, 21, 22, 23, 24, 25,
24, 25, 26, 27, 28, 29,
28, 29, 30, 31, 32, 1
};
#endif
static const char pc1[] = {
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
};
static const char totrot[] = {
1,2,4,6,8,10,12,14,15,17,19,21,23,25,27,28
};
static const char pc2[] = {
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
};
static const char si[8][64] = {
{
14, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9, 0, 7,
0, 15, 7, 4, 14, 2, 13, 1, 10, 6, 12, 11, 9, 5, 3, 8,
4, 1, 14, 8, 13, 6, 2, 11, 15, 12, 9, 7, 3, 10, 5, 0,
15, 12, 8, 2, 4, 9, 1, 7, 5, 11, 3, 14, 10, 0, 6, 13
},
{
15, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10,
3, 13, 4, 7, 15, 2, 8, 14, 12, 0, 1, 10, 6, 9, 11, 5,
0, 14, 7, 11, 10, 4, 13, 1, 5, 8, 12, 6, 9, 3, 2, 15,
13, 8, 10, 1, 3, 15, 4, 2, 11, 6, 7, 12, 0, 5, 14, 9
},
{
10, 0, 9, 14, 6, 3, 15, 5, 1, 13, 12, 7, 11, 4, 2, 8,
13, 7, 0, 9, 3, 4, 6, 10, 2, 8, 5, 14, 12, 11, 15, 1,
13, 6, 4, 9, 8, 15, 3, 0, 11, 1, 2, 12, 5, 10, 14, 7,
1, 10, 13, 0, 6, 9, 8, 7, 4, 15, 14, 3, 11, 5, 2, 12
},
{
7, 13, 14, 3, 0, 6, 9, 10, 1, 2, 8, 5, 11, 12, 4, 15,
13, 8, 11, 5, 6, 15, 0, 3, 4, 7, 2, 12, 1, 10, 14, 9,
10, 6, 9, 0, 12, 11, 7, 13, 15, 1, 3, 14, 5, 2, 8, 4,
3, 15, 0, 6, 10, 1, 13, 8, 9, 4, 5, 11, 12, 7, 2, 14
},
{
2, 12, 4, 1, 7, 10, 11, 6, 8, 5, 3, 15, 13, 0, 14, 9,
14, 11, 2, 12, 4, 7, 13, 1, 5, 0, 15, 10, 3, 9, 8, 6,
4, 2, 1, 11, 10, 13, 7, 8, 15, 9, 12, 5, 6, 3, 0, 14,
11, 8, 12, 7, 1, 14, 2, 13, 6, 15, 0, 9, 10, 4, 5, 3
},
{
12, 1, 10, 15, 9, 2, 6, 8, 0, 13, 3, 4, 14, 7, 5, 11,
10, 15, 4, 2, 7, 12, 9, 5, 6, 1, 13, 14, 0, 11, 3, 8,
9, 14, 15, 5, 2, 8, 12, 3, 7, 0, 4, 10, 1, 13, 11, 6,
4, 3, 2, 12, 9, 5, 15, 10, 11, 14, 1, 7, 6, 0, 8, 13
},
{
4, 11, 2, 14, 15, 0, 8, 13, 3, 12, 9, 7, 5, 10, 6, 1,
13, 0, 11, 7, 4, 9, 1, 10, 14, 3, 5, 12, 2, 15, 8, 6,
1, 4, 11, 13, 12, 3, 7, 14, 10, 15, 6, 8, 0, 5, 9, 2,
6, 11, 13, 8, 1, 4, 10, 7, 9, 5, 0, 15, 14, 2, 3, 12
},
{
13, 2, 8, 4, 6, 15, 11, 1, 10, 9, 3, 14, 5, 0, 12, 7,
1, 15, 13, 8, 10, 3, 7, 4, 12, 5, 6, 11, 0, 14, 9, 2,
7, 11, 4, 1, 9, 12, 14, 2, 0, 6, 10, 13, 15, 3, 5, 8,
2, 1, 14, 7, 4, 10, 8, 13, 15, 12, 9, 0, 3, 5, 6, 11
}
};
static const char p32i[] = {
16, 7, 20, 21,
29, 12, 28, 17,
1, 15, 23, 26,
5, 18, 31, 10,
2, 8, 24, 14,
32, 27, 3, 9,
19, 13, 30, 6,
22, 11, 4, 25
};
#if STATIC_PERMS
static long sp[8][64];
static char iperm[16][16][8];
static char fperm[16][16][8];
static char perms_init = 0;
#else
static long (*sp)[64];
static char (*iperm)[16][8];
static char (*fperm)[16][8];
#endif
static const int bytebit[] = {
0200,0100,040,020,010,04,02,01
};
static const int nibblebit[] = {
010,04,02,01
};
static void spinit() {
char pbox[32];
int p,i,s,j,rowcol;
long val;
for(p=0;p<32;p++){
for(i=0;i<32;i++){
if(p32i[i]-1 == p){
pbox[p] = i;
break;
}
}
}
for(s = 0; s < 8; s++){
for(i=0; i<64; i++){
val = 0;
rowcol = (i & 32) | ((i & 1) ? 16 : 0) | ((i >> 1) & 0xf);
for(j=0;j<4;j++){
if(si[s][rowcol] & (8 >> j)){
val |= 1L << (31 - pbox[4*s + j]);
}
}
sp[s][i] = val;
#if DES_DEBUG
printf("sp[%d][%2d] = %08lx\n",s,i,sp[s][i]);
#endif
}
}
}
static void perminit(char perm[16][16][8], const char p[64]) {
register int l, j, k;
int i,m;
for (i=0; i<16; i++)
for (j=0; j<16; j++)
for (k=0; k<8; k++)
perm[i][j][k]=0;
for (i=0; i<16; i++)
for (j = 0; j < 16; j++)
for (k = 0; k < 64; k++)
{ l = p[k] - 1;
if ((l >> 2) != i)
continue;
if (!(j & nibblebit[l & 3]))
continue;
m = k & 07;
perm[i][j][k>>3] |= bytebit[m];
}
}
int desinit(desInst dinst, int mode) {
dinst->desmode = mode;
#if STATIC_PERMS
if(perms_init) {
return 0;
}
#else
if(sp != NULL){
return 0;
}
if((sp = (long (*)[64])fmalloc(sizeof(long) * 8 * 64)) == NULL){
return -1;
}
iperm = (char (*)[16][8])fmalloc(sizeof(char) * 16 * 16 * 8);
if(iperm == NULL){
ffree((char *)sp);
return -1;
}
fperm = (char (*)[16][8])fmalloc(sizeof(char) * 16 * 16 * 8);
if(fperm == NULL){
ffree((char *)sp);
ffree((char *)iperm);
return -1;
}
#endif
spinit();
perminit(iperm,ip);
perminit(fperm,fp);
#if STATIC_PERMS
perms_init = 1;
#endif
return 0;
}
void desdone(desInst dinst) {
}
void dessetkey(desInst dinst, char *key) {
char pc1m[56];
char pcr[56];
register int i,j,l;
int m;
if(dinst->desmode == 2){
for(i=0;i<16;i++)
for(j=0;j<8;j++)
dinst->kn[i][j] = *key++;
return;
}
for (i=0; i<16; i++)
for (j=0; j<8; j++)
dinst->kn[i][j]=0;
for (j=0; j<56; j++) {
l=pc1[j]-1;
m = l & 07;
pc1m[j]=(key[l>>3] &
bytebit[m])
? 1 : 0;
}
for (i=0; i<16; i++) {
for (j=0; j<56; j++)
pcr[j] = pc1m[(l=j+totrot[i])<(j<28? 28 : 56) ? l: l-28];
for (j=0; j<48; j++){
if (pcr[pc2[j]-1]){
l= j % 6;
dinst->kn[i][j/6] |= bytebit[l] >> 2;
}
}
}
#if DES_DEBUG
for(i=0;i<16;i++) {
printf("dinst->kn[%d] = ", i);
for(j=0;j<8;j++) {
printf("%x ", dinst->kn[i][j]);
}
printf("\n");
}
#endif
}
static long int f(unsigned long r, unsigned char subkey[8]) {
register unsigned long rval,rt;
#if DES_DEBUG
printf("f(%08lx, %02x %02x %02x %02x %02x %02x %02x %02x) = ",
r,
subkey[0], subkey[1], subkey[2],
subkey[3], subkey[4], subkey[5],
subkey[6], subkey[7]);
#endif
rt = (r >> 1) | ((r & 1) ? 0x80000000 : 0);
rval = 0;
rval |= sp[0][((rt >> 26) ^ *subkey++) & 0x3f];
rval |= sp[1][((rt >> 22) ^ *subkey++) & 0x3f];
rval |= sp[2][((rt >> 18) ^ *subkey++) & 0x3f];
rval |= sp[3][((rt >> 14) ^ *subkey++) & 0x3f];
rval |= sp[4][((rt >> 10) ^ *subkey++) & 0x3f];
rval |= sp[5][((rt >> 6) ^ *subkey++) & 0x3f];
rval |= sp[6][((rt >> 2) ^ *subkey++) & 0x3f];
rt = (r << 1) | ((r & 0x80000000) ? 1 : 0);
rval |= sp[7][(rt ^ *subkey) & 0x3f];
#if DES_DEBUG
printf(" %08lx\n",rval);
#endif
return rval;
}
static void round(desInst dinst, int num, unsigned long int *block) {
if(num & 1){
block[1] ^= f(block[0],dinst->kn[num]);
} else {
block[0] ^= f(block[1],dinst->kn[num]);
}
}
static void permute(char *inblock, char perm[16][16][8], char *outblock) {
register int i,j;
register char *ib, *ob;
register char *p, *q;
if(perm == NULL){
for(i=8; i!=0; i--)
*outblock++ = *inblock++;
return;
}
for (i=8, ob = outblock; i != 0; i--)
*ob++ = 0;
ib = inblock;
for (j = 0; j < 16; j += 2, ib++) {
ob = outblock;
p = perm[j][(*ib >> 4) & 017];
q = perm[j + 1][*ib & 017];
for (i = 8; i != 0; i--){
*ob++ |= *p++ | *q++;
}
}
}
void endes(desInst dinst, char *block) {
register int i;
unsigned long work[2];
long tmp;
permute(block,iperm,(char *)work);
#ifdef __LITTLE_ENDIAN__
work[0] = byteswap(work[0]);
work[1] = byteswap(work[1]);
#endif
for (i=0; i<16; i++)
round(dinst,i,work);
tmp = work[0];
work[0] = work[1];
work[1] = tmp;
#ifdef __LITTLE_ENDIAN__
work[0] = byteswap(work[0]);
work[1] = byteswap(work[1]);
#endif
permute((char *)work,fperm,block);
}
void dedes(desInst dinst, char *block) {
register int i;
unsigned long work[2];
long tmp;
permute(block,iperm,(char *)work);
#ifdef __LITTLE_ENDIAN__
work[0] = byteswap(work[0]);
work[1] = byteswap(work[1]);
#endif
tmp = work[0];
work[0] = work[1];
work[1] = tmp;
for (i=15; i >= 0; i--)
round(dinst,i,work);
#ifdef __LITTLE_ENDIAN__
work[0] = byteswap(work[0]);
work[1] = byteswap(work[1]);
#endif
permute((char *)work,fperm,block);
}