1 | /* |
2 | * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved. |
3 | * |
4 | * Licensed under the Apache License 2.0 (the "License"). You may not use |
5 | * this file except in compliance with the License. You can obtain a copy |
6 | * in the file LICENSE in the source distribution or at |
7 | * https://www.openssl.org/source/license.html |
8 | */ |
9 | |
10 | #include <openssl/crypto.h> |
11 | #include "des_local.h" |
12 | |
13 | void DES_string_to_key(const char *str, DES_cblock *key) |
14 | { |
15 | DES_key_schedule ks; |
16 | int i, length; |
17 | |
18 | memset(key, 0, 8); |
19 | length = strlen(str); |
20 | for (i = 0; i < length; i++) { |
21 | register unsigned char j = str[i]; |
22 | |
23 | if ((i % 16) < 8) |
24 | (*key)[i % 8] ^= (j << 1); |
25 | else { |
26 | /* Reverse the bit order 05/05/92 eay */ |
27 | j = ((j << 4) & 0xf0) | ((j >> 4) & 0x0f); |
28 | j = ((j << 2) & 0xcc) | ((j >> 2) & 0x33); |
29 | j = ((j << 1) & 0xaa) | ((j >> 1) & 0x55); |
30 | (*key)[7 - (i % 8)] ^= j; |
31 | } |
32 | } |
33 | DES_set_odd_parity(key); |
34 | DES_set_key_unchecked(key, &ks); |
35 | DES_cbc_cksum((const unsigned char *)str, key, length, &ks, key); |
36 | OPENSSL_cleanse(&ks, sizeof(ks)); |
37 | DES_set_odd_parity(key); |
38 | } |
39 | |
40 | void DES_string_to_2keys(const char *str, DES_cblock *key1, DES_cblock *key2) |
41 | { |
42 | DES_key_schedule ks; |
43 | int i, length; |
44 | |
45 | memset(key1, 0, 8); |
46 | memset(key2, 0, 8); |
47 | length = strlen(str); |
48 | for (i = 0; i < length; i++) { |
49 | register unsigned char j = str[i]; |
50 | |
51 | if ((i % 32) < 16) { |
52 | if ((i % 16) < 8) |
53 | (*key1)[i % 8] ^= (j << 1); |
54 | else |
55 | (*key2)[i % 8] ^= (j << 1); |
56 | } else { |
57 | j = ((j << 4) & 0xf0) | ((j >> 4) & 0x0f); |
58 | j = ((j << 2) & 0xcc) | ((j >> 2) & 0x33); |
59 | j = ((j << 1) & 0xaa) | ((j >> 1) & 0x55); |
60 | if ((i % 16) < 8) |
61 | (*key1)[7 - (i % 8)] ^= j; |
62 | else |
63 | (*key2)[7 - (i % 8)] ^= j; |
64 | } |
65 | } |
66 | if (length <= 8) |
67 | memcpy(key2, key1, 8); |
68 | DES_set_odd_parity(key1); |
69 | DES_set_odd_parity(key2); |
70 | DES_set_key_unchecked(key1, &ks); |
71 | DES_cbc_cksum((const unsigned char *)str, key1, length, &ks, key1); |
72 | DES_set_key_unchecked(key2, &ks); |
73 | DES_cbc_cksum((const unsigned char *)str, key2, length, &ks, key2); |
74 | OPENSSL_cleanse(&ks, sizeof(ks)); |
75 | DES_set_odd_parity(key1); |
76 | DES_set_odd_parity(key2); |
77 | } |
78 | |