annotate random.c @ 255:89ace56293f6

* common-algo.c: use zlib for dbclient
author Matt Johnston <matt@ucc.asn.au>
date Tue, 08 Nov 2005 11:35:52 +0000
parents 65585699d980
children ca7e76d981d9 3be7ae2e8dfa
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
1 /*
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
2 * Dropbear - a SSH2 server
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
3 *
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
4 * Copyright (c) 2002,2003 Matt Johnston
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
5 * All rights reserved.
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
6 *
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
7 * Permission is hereby granted, free of charge, to any person obtaining a copy
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
8 * of this software and associated documentation files (the "Software"), to deal
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
9 * in the Software without restriction, including without limitation the rights
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
11 * copies of the Software, and to permit persons to whom the Software is
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
12 * furnished to do so, subject to the following conditions:
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
13 *
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
14 * The above copyright notice and this permission notice shall be included in
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
15 * all copies or substantial portions of the Software.
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
16 *
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
23 * SOFTWARE. */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
24
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
25 #include "includes.h"
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
26 #include "buffer.h"
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
27 #include "dbutil.h"
188
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 159
diff changeset
28 #include "bignum.h"
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
29
198
65585699d980 * add a "label" argument to printhex()
Matt Johnston <matt@ucc.asn.au>
parents: 189
diff changeset
30 static int donerandinit = 0;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
31
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
32 /* this is used to generate unique output from the same hashpool */
198
65585699d980 * add a "label" argument to printhex()
Matt Johnston <matt@ucc.asn.au>
parents: 189
diff changeset
33 static unsigned int counter = 0;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
34 #define MAX_COUNTER 1000000/* the max value for the counter, so it won't loop */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
35
198
65585699d980 * add a "label" argument to printhex()
Matt Johnston <matt@ucc.asn.au>
parents: 189
diff changeset
36 static unsigned char hashpool[SHA1_HASH_SIZE];
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
37
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
38 #define INIT_SEED_SIZE 32 /* 256 bits */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
39
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
40 static void readrand(unsigned char* buf, unsigned int buflen);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
41
149
ed9ca2a9705c Cleaned up the random code, use /dev/random by default,
Matt Johnston <matt@ucc.asn.au>
parents: 70
diff changeset
42 /* The basic setup is we read some data from /dev/(u)random or prngd and hash it
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
43 * into hashpool. To read data, we hash together current hashpool contents,
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
44 * and a counter. We feed more data in by hashing the current pool and new
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
45 * data into the pool.
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
46 *
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
47 * It is important to ensure that counter doesn't wrap around before we
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
48 * feed in new entropy.
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
49 *
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
50 */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
51
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
52 static void readrand(unsigned char* buf, unsigned int buflen) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
53
185
5ccad7634388 * warn if we seem to be blocking on /dev/random
Matt Johnston <matt@ucc.asn.au>
parents: 159
diff changeset
54 static int already_blocked = 0;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
55 int readfd;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
56 unsigned int readpos;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
57 int readlen;
149
ed9ca2a9705c Cleaned up the random code, use /dev/random by default,
Matt Johnston <matt@ucc.asn.au>
parents: 70
diff changeset
58 #ifdef DROPBEAR_PRNGD_SOCKET
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
59 struct sockaddr_un egdsock;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
60 char egdcmd[2];
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
61 #endif
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
62
149
ed9ca2a9705c Cleaned up the random code, use /dev/random by default,
Matt Johnston <matt@ucc.asn.au>
parents: 70
diff changeset
63 #ifdef DROPBEAR_RANDOM_DEV
ed9ca2a9705c Cleaned up the random code, use /dev/random by default,
Matt Johnston <matt@ucc.asn.au>
parents: 70
diff changeset
64 readfd = open(DROPBEAR_RANDOM_DEV, O_RDONLY);
70
b0316ce64e4b Merging in the changes from 0.41-0.43 main Dropbear tree
Matt Johnston <matt@ucc.asn.au>
parents: 4
diff changeset
65 if (readfd < 0) {
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
66 dropbear_exit("couldn't open random device");
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
67 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
68 #endif
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
69
149
ed9ca2a9705c Cleaned up the random code, use /dev/random by default,
Matt Johnston <matt@ucc.asn.au>
parents: 70
diff changeset
70 #ifdef DROPBEAR_PRNGD_SOCKET
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
71 memset((void*)&egdsock, 0x0, sizeof(egdsock));
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
72 egdsock.sun_family = AF_UNIX;
159
4bd4fc8023bd random.c: fix missed instance of DROPBEAR_EGD_SOCKET
Matt Johnston <matt@ucc.asn.au>
parents: 149
diff changeset
73 strlcpy(egdsock.sun_path, DROPBEAR_PRNGD_SOCKET,
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
74 sizeof(egdsock.sun_path));
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
75
70
b0316ce64e4b Merging in the changes from 0.41-0.43 main Dropbear tree
Matt Johnston <matt@ucc.asn.au>
parents: 4
diff changeset
76 readfd = socket(PF_UNIX, SOCK_STREAM, 0);
b0316ce64e4b Merging in the changes from 0.41-0.43 main Dropbear tree
Matt Johnston <matt@ucc.asn.au>
parents: 4
diff changeset
77 if (readfd < 0) {
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
78 dropbear_exit("couldn't open random device");
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
79 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
80 /* todo - try various common locations */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
81 if (connect(readfd, (struct sockaddr*)&egdsock,
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
82 sizeof(struct sockaddr_un)) < 0) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
83 dropbear_exit("couldn't open random device");
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
84 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
85
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
86 if (buflen > 255)
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
87 dropbear_exit("can't request more than 255 bytes from egd");
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
88 egdcmd[0] = 0x02; /* blocking read */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
89 egdcmd[1] = (unsigned char)buflen;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
90 if (write(readfd, egdcmd, 2) < 0)
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
91 dropbear_exit("can't send command to egd");
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
92 #endif
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
93
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
94 /* read the actual random data */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
95 readpos = 0;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
96 do {
185
5ccad7634388 * warn if we seem to be blocking on /dev/random
Matt Johnston <matt@ucc.asn.au>
parents: 159
diff changeset
97 if (!already_blocked)
5ccad7634388 * warn if we seem to be blocking on /dev/random
Matt Johnston <matt@ucc.asn.au>
parents: 159
diff changeset
98 {
5ccad7634388 * warn if we seem to be blocking on /dev/random
Matt Johnston <matt@ucc.asn.au>
parents: 159
diff changeset
99 int ret;
5ccad7634388 * warn if we seem to be blocking on /dev/random
Matt Johnston <matt@ucc.asn.au>
parents: 159
diff changeset
100 struct timeval timeout;
5ccad7634388 * warn if we seem to be blocking on /dev/random
Matt Johnston <matt@ucc.asn.au>
parents: 159
diff changeset
101 fd_set read_fds;
5ccad7634388 * warn if we seem to be blocking on /dev/random
Matt Johnston <matt@ucc.asn.au>
parents: 159
diff changeset
102
5ccad7634388 * warn if we seem to be blocking on /dev/random
Matt Johnston <matt@ucc.asn.au>
parents: 159
diff changeset
103 timeout.tv_sec = 2; /* two seconds should be enough */
5ccad7634388 * warn if we seem to be blocking on /dev/random
Matt Johnston <matt@ucc.asn.au>
parents: 159
diff changeset
104 timeout.tv_usec = 0;
5ccad7634388 * warn if we seem to be blocking on /dev/random
Matt Johnston <matt@ucc.asn.au>
parents: 159
diff changeset
105
5ccad7634388 * warn if we seem to be blocking on /dev/random
Matt Johnston <matt@ucc.asn.au>
parents: 159
diff changeset
106 FD_ZERO(&read_fds);
5ccad7634388 * warn if we seem to be blocking on /dev/random
Matt Johnston <matt@ucc.asn.au>
parents: 159
diff changeset
107 FD_SET(readfd, &read_fds);
5ccad7634388 * warn if we seem to be blocking on /dev/random
Matt Johnston <matt@ucc.asn.au>
parents: 159
diff changeset
108 ret = select(readfd + 1, &read_fds, NULL, NULL, &timeout);
5ccad7634388 * warn if we seem to be blocking on /dev/random
Matt Johnston <matt@ucc.asn.au>
parents: 159
diff changeset
109 if (ret == 0)
5ccad7634388 * warn if we seem to be blocking on /dev/random
Matt Johnston <matt@ucc.asn.au>
parents: 159
diff changeset
110 {
5ccad7634388 * warn if we seem to be blocking on /dev/random
Matt Johnston <matt@ucc.asn.au>
parents: 159
diff changeset
111 dropbear_log(LOG_INFO, "Warning: Reading the random source seems to have blocked.\nIf you experience problems, you probably need to find a better entropy source.");
5ccad7634388 * warn if we seem to be blocking on /dev/random
Matt Johnston <matt@ucc.asn.au>
parents: 159
diff changeset
112 already_blocked = 1;
5ccad7634388 * warn if we seem to be blocking on /dev/random
Matt Johnston <matt@ucc.asn.au>
parents: 159
diff changeset
113 }
5ccad7634388 * warn if we seem to be blocking on /dev/random
Matt Johnston <matt@ucc.asn.au>
parents: 159
diff changeset
114 }
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
115 readlen = read(readfd, &buf[readpos], buflen - readpos);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
116 if (readlen <= 0) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
117 if (readlen < 0 && errno == EINTR) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
118 continue;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
119 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
120 dropbear_exit("error reading random source");
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
121 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
122 readpos += readlen;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
123 } while (readpos < buflen);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
124
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
125 close (readfd);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
126 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
127
149
ed9ca2a9705c Cleaned up the random code, use /dev/random by default,
Matt Johnston <matt@ucc.asn.au>
parents: 70
diff changeset
128 /* initialise the prng from /dev/(u)random or prngd */
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
129 void seedrandom() {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
130
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
131 unsigned char readbuf[INIT_SEED_SIZE];
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
132
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
133 hash_state hs;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
134
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
135 /* initialise so compilers will be happy about hashing it */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
136 if (!donerandinit) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
137 m_burn(hashpool, sizeof(hashpool));
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
138 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
139
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
140 /* get the seed data */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
141 readrand(readbuf, sizeof(readbuf));
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
142
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
143 /* hash in the new seed data */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
144 sha1_init(&hs);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
145 sha1_process(&hs, (void*)hashpool, sizeof(hashpool));
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
146 sha1_process(&hs, (void*)readbuf, sizeof(readbuf));
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
147 sha1_done(&hs, hashpool);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
148
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
149 counter = 0;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
150 donerandinit = 1;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
151 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
152
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
153 /* return len bytes of pseudo-random data */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
154 void genrandom(unsigned char* buf, unsigned int len) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
155
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
156 hash_state hs;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
157 unsigned char hash[SHA1_HASH_SIZE];
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
158 unsigned int copylen;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
159
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
160 if (!donerandinit) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
161 dropbear_exit("seedrandom not done");
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
162 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
163
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
164 while (len > 0) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
165 sha1_init(&hs);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
166 sha1_process(&hs, (void*)hashpool, sizeof(hashpool));
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
167 sha1_process(&hs, (void*)&counter, sizeof(counter));
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
168 sha1_done(&hs, hash);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
169
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
170 counter++;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
171 if (counter > MAX_COUNTER) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
172 seedrandom();
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
173 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
174
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
175 copylen = MIN(len, SHA1_HASH_SIZE);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
176 memcpy(buf, hash, copylen);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
177 len -= copylen;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
178 buf += copylen;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
179 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
180 m_burn(hash, sizeof(hash));
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
181 }
188
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 159
diff changeset
182
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 159
diff changeset
183 /* Generates a random mp_int.
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 159
diff changeset
184 * max is a *mp_int specifying an upper bound.
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 159
diff changeset
185 * rand must be an initialised *mp_int for the result.
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 159
diff changeset
186 * the result rand satisfies: 0 < rand < max
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 159
diff changeset
187 * */
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 159
diff changeset
188 void gen_random_mpint(mp_int *max, mp_int *rand) {
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 159
diff changeset
189
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 159
diff changeset
190 unsigned char *randbuf = NULL;
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 159
diff changeset
191 unsigned int len = 0;
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 159
diff changeset
192 const char masks[] = {0xff, 0x01, 0x03, 0x07, 0x0f, 0x1f, 0x3f, 0x7f};
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 159
diff changeset
193
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 159
diff changeset
194 const int size_bits = mp_count_bits(max);
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 159
diff changeset
195
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 159
diff changeset
196 len = size_bits / 8;
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 159
diff changeset
197 if ((size_bits % 8) != 0) {
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 159
diff changeset
198 len += 1;
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 159
diff changeset
199 }
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 159
diff changeset
200
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 159
diff changeset
201 randbuf = (unsigned char*)m_malloc(len);
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 159
diff changeset
202 do {
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 159
diff changeset
203 genrandom(randbuf, len);
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 159
diff changeset
204 /* Mask out the unrequired bits - mp_read_unsigned_bin expects
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 159
diff changeset
205 * MSB first.*/
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 159
diff changeset
206 randbuf[0] &= masks[size_bits % 8];
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 159
diff changeset
207
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 159
diff changeset
208 bytes_to_mp(rand, randbuf, len);
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 159
diff changeset
209
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 159
diff changeset
210 /* keep regenerating until we get one satisfying
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 159
diff changeset
211 * 0 < rand < max */
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 159
diff changeset
212 } while ( ( (max != NULL) && (mp_cmp(rand, max) != MP_LT) )
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 159
diff changeset
213 || (mp_cmp_d(rand, 0) != MP_GT) );
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 159
diff changeset
214 m_burn(randbuf, len);
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 159
diff changeset
215 m_free(randbuf);
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 159
diff changeset
216 }