1 #include <stdint.h>
2 #include <stdlib.h>
3 #include <unistd.h>
4
5 #include "crypt_des.h"
6
7 static struct expanded_key __encrypt_key;
8
setkey(const char * key)9 void 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
encrypt(char * block,int edflag)23 void 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