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d02b48c6 | 1 | /* crypto/des/rand_key.c */ |
58964a49 | 2 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
d02b48c6 RE |
3 | * All rights reserved. |
4 | * | |
5 | * This package is an SSL implementation written | |
6 | * by Eric Young (eay@cryptsoft.com). | |
7 | * The implementation was written so as to conform with Netscapes SSL. | |
8 | * | |
9 | * This library is free for commercial and non-commercial use as long as | |
10 | * the following conditions are aheared to. The following conditions | |
11 | * apply to all code found in this distribution, be it the RC4, RSA, | |
12 | * lhash, DES, etc., code; not just the SSL code. The SSL documentation | |
13 | * included with this distribution is covered by the same copyright terms | |
14 | * except that the holder is Tim Hudson (tjh@cryptsoft.com). | |
15 | * | |
16 | * Copyright remains Eric Young's, and as such any Copyright notices in | |
17 | * the code are not to be removed. | |
18 | * If this package is used in a product, Eric Young should be given attribution | |
19 | * as the author of the parts of the library used. | |
20 | * This can be in the form of a textual message at program startup or | |
21 | * in documentation (online or textual) provided with the package. | |
22 | * | |
23 | * Redistribution and use in source and binary forms, with or without | |
24 | * modification, are permitted provided that the following conditions | |
25 | * are met: | |
26 | * 1. Redistributions of source code must retain the copyright | |
27 | * notice, this list of conditions and the following disclaimer. | |
28 | * 2. Redistributions in binary form must reproduce the above copyright | |
29 | * notice, this list of conditions and the following disclaimer in the | |
30 | * documentation and/or other materials provided with the distribution. | |
31 | * 3. All advertising materials mentioning features or use of this software | |
32 | * must display the following acknowledgement: | |
33 | * "This product includes cryptographic software written by | |
34 | * Eric Young (eay@cryptsoft.com)" | |
35 | * The word 'cryptographic' can be left out if the rouines from the library | |
36 | * being used are not cryptographic related :-). | |
37 | * 4. If you include any Windows specific code (or a derivative thereof) from | |
38 | * the apps directory (application code) you must include an acknowledgement: | |
39 | * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" | |
40 | * | |
41 | * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND | |
42 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
43 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
44 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE | |
45 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
46 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
47 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
48 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
49 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
50 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
51 | * SUCH DAMAGE. | |
52 | * | |
53 | * The licence and distribution terms for any publically available version or | |
54 | * derivative of this code cannot be changed. i.e. this code cannot simply be | |
55 | * copied and put under another distribution licence | |
56 | * [including the GNU Public Licence.] | |
57 | */ | |
58 | ||
59 | #include "des_locl.h" | |
60 | #include <time.h> | |
61 | ||
62 | static int seed=0; | |
63 | static des_cblock init; | |
64 | ||
edf0bfb5 | 65 | void des_random_seed(des_cblock *key) |
d02b48c6 | 66 | { |
edf0bfb5 | 67 | memcpy(&init,key,sizeof(des_cblock)); |
d02b48c6 RE |
68 | seed=1; |
69 | } | |
70 | ||
edf0bfb5 | 71 | void des_random_key(des_cblock *ret) |
d02b48c6 RE |
72 | { |
73 | des_key_schedule ks; | |
74 | static DES_LONG c=0; | |
75 | static unsigned short pid=0; | |
76 | static des_cblock data={0x01,0x23,0x45,0x67,0x89,0xab,0xcd,0xef}; | |
77 | des_cblock key; | |
78 | unsigned char *p; | |
79 | DES_LONG t; | |
80 | int i; | |
81 | ||
82 | #ifdef MSDOS | |
83 | pid=1; | |
84 | #else | |
85 | if (!pid) pid=getpid(); | |
86 | #endif | |
87 | p=key; | |
88 | if (seed) | |
89 | { | |
90 | for (i=0; i<8; i++) | |
91 | { | |
92 | data[i] ^= init[i]; | |
93 | init[i]=0; | |
94 | } | |
95 | seed=0; | |
96 | } | |
97 | t=(DES_LONG)time(NULL); | |
98 | l2c(t,p); | |
99 | t=(DES_LONG)((pid)|((c++)<<16)); | |
100 | l2c(t,p); | |
101 | ||
edf0bfb5 | 102 | des_set_odd_parity(&data); |
cddfe788 | 103 | des_set_key_unchecked(&data,ks); |
edf0bfb5 | 104 | des_cbc_cksum(key,&key,sizeof(key),ks,&data); |
d02b48c6 | 105 | |
edf0bfb5 | 106 | des_set_odd_parity(&key); |
cddfe788 | 107 | des_set_key_unchecked(&key,ks); |
edf0bfb5 | 108 | des_cbc_cksum(key,&data,sizeof(key),ks,&key); |
d02b48c6 RE |
109 | |
110 | memcpy(ret,data,sizeof(key)); | |
111 | memset(key,0,sizeof(key)); | |
112 | memset(ks,0,sizeof(ks)); | |
113 | t=0; | |
114 | } |