| 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 | |
| 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 | |
| 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 | } |