/* From Andy Tanenbaum's book "Computer Networks",
unsigned char b_data
[64];
unsigned char o_data
[64];
static struct ordering InitialTr
= {
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 struct ordering FinalTr
= {
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,
static struct ordering swap
= {
33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,
49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,
1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14,15,16,
17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,
static struct ordering KeyTr1
= {
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 struct ordering KeyTr2
= {
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 struct ordering etr
= {
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,
static struct ordering ptr
= {
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,
static unsigned char s_boxes
[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,
1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1,
static void transpose(struct block
*data
, struct ordering
*t
, int n
)
data
->b_data
[n
] = x
.b_data
[t
->o_data
[n
] - 1];
static void rotate(struct block
*key
)
register unsigned char *p
= key
->b_data
;
register unsigned char *ep
= &(key
->b_data
[55]);
int data0
= key
->b_data
[0], data28
= key
->b_data
[28];
while (p
++ < ep
) *(p
-1) = *p
;
key
->b_data
[27] = (char) data0
;
key
->b_data
[55] = (char) data28
;
static struct ordering
*EP
= &etr
;
static void f(int i
, struct block
*key
, struct block
*a
, struct block
*x
)
register unsigned char *p
, *q
, *r
;
for (k
= rots
[i
]; k
; k
--) rotate(key
);
transpose(&ikey
, &KeyTr2
, 48);
for (k
= 0; k
< 8; k
++) {
*q
++ = (char) (xb
>> 3) & 1;
*q
++ = (char) (xb
>>2) & 1;
*q
++ = (char) (xb
>>1) & 1;
key
= *((struct block
*) k
);
transpose(&key
, &KeyTr1
, 56);
void encrypt(char *blck
, int edflag
)
register struct block
*p
= (struct block
*) blck
;
transpose(p
, &InitialTr
, 64);
for (i
= 15; i
>= 0; i
--) {
int j
= edflag
? i
: 15 - i
;
for (k
= 31; k
>= 0; k
--) {
p
->b_data
[k
] = b
.b_data
[k
+ 32];
for (k
= 31; k
>= 0; k
--) {
p
->b_data
[k
+32] = b
.b_data
[k
] ^ x
.b_data
[k
];
transpose(p
, &FinalTr
, 64);
char *crypt(char *pw
, char *salt
)
while (*pw
&& p
< &pwb
[64]) {
while (p
< &pwb
[64]) *p
++ = 0;
while (p
< &pwb
[66]) *p
++ = 0;
for (i
= 0; i
< 2; i
++) {
register char c
= *salt
++;
if ( c
> 'Z') c
-= 6 + 7 + '.'; /* c was a lower case letter */
else if ( c
> '9') c
-= 7 + '.';/* c was upper case letter */
else c
-= '.'; /* c was digit, '.' or '/'. */
for (j
= 0; j
< 6; j
++) {
int temp
= new_etr
.o_data
[t
];
new_etr
.o_data
[t
] = new_etr
.o_data
[t
+24];
new_etr
.o_data
[t
+24] = (char) temp
;
if (result
[1] == 0) result
[1] = result
[0];
for (i
= 0; i
< 25; i
++) encrypt(pwb
,0);
c
+= '.'; /* becomes >= '.' */
if (c
> '9') c
+= 7; /* not in [./0-9], becomes upper */
if (c
> 'Z') c
+= 6; /* not in [A-Z], becomes lower */