1#include <stdint.h>
2#include <stdlib.h>
3#include <unistd.h>
4
5#include "crypt_des.h"
6
7static struct expanded_key __encrypt_key;
8
9void setkey(const char *key)
10{
11	unsigned char bkey[8];
12	int i, j;
13
14	for (i = 0; i < 8; i++) {
15		bkey[i] = 0;
16		for (j = 7; j >= 0; j--, key++)
17			bkey[i] |= (uint32_t)(*key & 1) << j;
18	}
19
20	__des_setkey(bkey, &__encrypt_key);
21}
22
23void encrypt(char *block, int edflag)
24{
25	struct expanded_key decrypt_key, *key;
26	uint32_t b[2];
27	int i, j;
28	char *p;
29
30	p = block;
31	for (i = 0; i < 2; i++) {
32		b[i] = 0;
33		for (j = 31; j >= 0; j--, p++)
34			b[i] |= (uint32_t)(*p & 1) << j;
35	}
36
37	key = &__encrypt_key;
38	if (edflag) {
39		key = &decrypt_key;
40		for (i = 0; i < 16; i++) {
41			decrypt_key.l[i] = __encrypt_key.l[15-i];
42			decrypt_key.r[i] = __encrypt_key.r[15-i];
43		}
44	}
45
46	__do_des(b[0], b[1], b, b + 1, 1, 0, key);
47
48	p = block;
49	for (i = 0; i < 2; i++)
50		for (j = 31; j >= 0; j--)
51			*p++ = b[i]>>j & 1;
52}
53