Mercurial > dropbear
annotate random.c @ 689:c3de235d9506
/dev/random blocks on busy servers too.
author | Matt Johnston <matt@ucc.asn.au> |
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date | Thu, 19 Jul 2012 21:34:27 +0800 |
parents | 650c41a4909a |
children | c85bb68e1db6 |
rev | line source |
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1 /* |
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2 * Dropbear - a SSH2 server |
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3 * |
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4 * Copyright (c) 2002,2003 Matt Johnston |
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5 * All rights reserved. |
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6 * |
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7 * Permission is hereby granted, free of charge, to any person obtaining a copy |
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8 * of this software and associated documentation files (the "Software"), to deal |
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9 * in the Software without restriction, including without limitation the rights |
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10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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11 * copies of the Software, and to permit persons to whom the Software is |
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12 * furnished to do so, subject to the following conditions: |
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13 * |
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14 * The above copyright notice and this permission notice shall be included in |
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15 * all copies or substantial portions of the Software. |
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16 * |
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17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
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23 * SOFTWARE. */ |
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24 |
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25 #include "includes.h" |
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26 #include "buffer.h" |
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27 #include "dbutil.h" |
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28 #include "bignum.h" |
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29 |
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30 /* this is used to generate unique output from the same hashpool */ |
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31 static uint32_t counter = 0; |
298
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32 /* the max value for the counter, so it won't integer overflow */ |
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33 #define MAX_COUNTER 1<<30 |
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34 |
687 | 35 static unsigned char hashpool[SHA1_HASH_SIZE] = {0}; |
36 static int donerandinit = 0; | |
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37 |
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38 #define INIT_SEED_SIZE 32 /* 256 bits */ |
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39 |
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40 /* The basic setup is we read some data from /dev/(u)random or prngd and hash it |
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41 * into hashpool. To read data, we hash together current hashpool contents, |
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42 * and a counter. We feed more data in by hashing the current pool and new |
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43 * data into the pool. |
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44 * |
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45 * It is important to ensure that counter doesn't wrap around before we |
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46 * feed in new entropy. |
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47 * |
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48 */ |
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49 |
687 | 50 /* Pass len=0 to hash an entire file */ |
51 static int | |
52 process_file(hash_state *hs, const char *filename, | |
53 unsigned int len, int prngd) | |
54 { | |
185
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55 static int already_blocked = 0; |
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56 int readfd; |
687 | 57 unsigned int readcount; |
58 int ret = DROPBEAR_FAILURE; | |
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59 |
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60 #ifdef DROPBEAR_PRNGD_SOCKET |
687 | 61 if (prngd) |
62 { | |
63 readfd = connect_unix(filename); | |
64 } | |
65 else | |
66 #endif | |
67 { | |
68 readfd = open(filename, O_RDONLY); | |
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69 } |
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70 |
687 | 71 if (readfd < 0) { |
72 goto out; | |
73 } | |
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74 |
687 | 75 readcount = 0; |
76 while (readcount < len) | |
77 { | |
78 int readlen, wantread; | |
79 unsigned char readbuf[128]; | |
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80 if (!already_blocked) |
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81 { |
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82 int ret; |
687 | 83 struct timeval timeout = { .tv_sec = 2, .tv_usec = 0}; |
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84 fd_set read_fds; |
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85 |
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86 FD_ZERO(&read_fds); |
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87 FD_SET(readfd, &read_fds); |
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88 ret = select(readfd + 1, &read_fds, NULL, NULL, &timeout); |
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89 if (ret == 0) |
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90 { |
687 | 91 dropbear_log(LOG_WARNING, "Warning: Reading the randomness source '%s' seems to have blocked.\nYou may need to find a better entropy source.", filename); |
185
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92 already_blocked = 1; |
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93 } |
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94 } |
687 | 95 |
96 wantread = MIN(sizeof(readbuf), len-readcount); | |
97 | |
98 #ifdef DROPBEAR_PRNGD_SOCKET | |
99 if (prngd) | |
100 { | |
101 char egdcmd[2]; | |
102 egdcmd[0] = 0x02; /* blocking read */ | |
103 egdcmd[1] = (unsigned char)wantread; | |
104 if (write(readfd, egdcmd, 2) < 0) | |
105 { | |
106 dropbear_exit("Can't send command to egd"); | |
107 } | |
108 } | |
109 #endif | |
110 | |
111 readlen = read(readfd, readbuf, wantread); | |
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112 if (readlen <= 0) { |
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113 if (readlen < 0 && errno == EINTR) { |
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114 continue; |
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115 } |
687 | 116 if (readlen == 0 && len == 0) |
117 { | |
118 /* whole file was read as requested */ | |
119 break; | |
120 } | |
121 goto out; | |
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122 } |
687 | 123 sha1_process(hs, readbuf, readlen); |
124 readcount += readlen; | |
125 } | |
126 ret = DROPBEAR_SUCCESS; | |
127 out: | |
128 close(readfd); | |
129 return ret; | |
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130 } |
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131 |
687 | 132 void addrandom(char * buf, int len) |
133 { | |
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134 hash_state hs; |
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135 |
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136 /* hash in the new seed data */ |
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137 sha1_init(&hs); |
687 | 138 /* existing state (zeroes on startup) */ |
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139 sha1_process(&hs, (void*)hashpool, sizeof(hashpool)); |
687 | 140 |
141 /* new */ | |
142 sha1_process(&hs, buf, len); | |
143 sha1_done(&hs, hashpool); | |
144 } | |
145 | |
146 static void write_urandom() | |
147 { | |
148 #ifndef DROPBEAR_PRNGD_SOCKET | |
149 /* This is opportunistic, don't worry about failure */ | |
150 unsigned char buf[INIT_SEED_SIZE]; | |
151 FILE *f = fopen(DROPBEAR_URANDOM_DEV, "w"); | |
152 genrandom(buf, sizeof(buf)); | |
153 fwrite(buf, sizeof(buf), 1, f); | |
154 fclose(f); | |
155 #endif | |
156 } | |
157 | |
158 /* Initialise the prng from /dev/urandom or prngd. This function can | |
159 * be called multiple times */ | |
160 void seedrandom() { | |
161 | |
162 hash_state hs; | |
163 | |
164 pid_t pid; | |
165 struct timeval tv; | |
166 clock_t clockval; | |
167 | |
168 /* hash in the new seed data */ | |
169 sha1_init(&hs); | |
170 /* existing state */ | |
171 sha1_process(&hs, (void*)hashpool, sizeof(hashpool)); | |
172 | |
173 #ifdef DROPBEAR_PRNGD_SOCKET | |
174 if (process_file(&hs, DROPBEAR_PRNGD_SOCKET, INIT_SEED_SIZE, 1) | |
175 != DROPBEAR_SUCCESS) { | |
176 dropbear_exit("Failure reading random device %s", | |
177 DROPBEAR_PRNGD_SOCKET); | |
178 } | |
179 #else | |
180 /* non-blocking random source (probably /dev/urandom) */ | |
181 if (process_file(&hs, DROPBEAR_URANDOM_DEV, INIT_SEED_SIZE, 0) | |
182 != DROPBEAR_SUCCESS) { | |
183 dropbear_exit("Failure reading random device %s", | |
184 DROPBEAR_URANDOM_DEV); | |
185 } | |
186 #endif | |
187 | |
188 /* A few other sources to fall back on. Add more here for other platforms */ | |
189 #ifdef __linux__ | |
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190 /* Seems to be a reasonable source of entropy from timers. Possibly hard |
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191 * for even local attackers to reproduce */ |
687 | 192 process_file(&hs, "/proc/timer_list", 0, 0); |
193 /* Might help on systems with wireless */ | |
194 process_file(&hs, "/proc/interrupts", 0, 0); | |
688
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195 |
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196 /* Mostly network visible but useful in some situations */ |
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197 process_file(&hs, "/proc/net/netstat", 0, 0); |
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198 process_file(&hs, "/proc/net/dev", 0, 0); |
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199 process_file(&hs, "/proc/net/tcp", 0, 0); |
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200 /* Also includes interface lo */ |
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201 process_file(&hs, "/proc/net/rt_cache", 0, 0); |
687 | 202 #endif |
203 | |
204 pid = getpid(); | |
205 sha1_process(&hs, (void*)&pid, sizeof(pid)); | |
206 | |
207 gettimeofday(&tv, NULL); | |
208 sha1_process(&hs, (void*)&tv, sizeof(tv)); | |
209 | |
210 clockval = clock(); | |
211 sha1_process(&hs, (void*)&clockval, sizeof(clockval)); | |
212 | |
213 /* When a private key is read by the client or server it will | |
214 * be added to the hashpool - see runopts.c */ | |
215 | |
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216 sha1_done(&hs, hashpool); |
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217 |
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218 counter = 0; |
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219 donerandinit = 1; |
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220 |
687 | 221 /* Feed it all back into /dev/urandom - this might help if Dropbear |
222 * is running from inetd and gets new state each time */ | |
223 write_urandom(); | |
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224 } |
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225 |
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226 /* return len bytes of pseudo-random data */ |
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227 void genrandom(unsigned char* buf, unsigned int len) { |
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228 |
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229 hash_state hs; |
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230 unsigned char hash[SHA1_HASH_SIZE]; |
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231 unsigned int copylen; |
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232 |
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233 if (!donerandinit) { |
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234 dropbear_exit("seedrandom not done"); |
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235 } |
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236 |
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237 while (len > 0) { |
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238 sha1_init(&hs); |
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239 sha1_process(&hs, (void*)hashpool, sizeof(hashpool)); |
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240 sha1_process(&hs, (void*)&counter, sizeof(counter)); |
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241 sha1_done(&hs, hash); |
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242 |
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243 counter++; |
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244 if (counter > MAX_COUNTER) { |
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245 seedrandom(); |
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246 } |
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247 |
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248 copylen = MIN(len, SHA1_HASH_SIZE); |
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249 memcpy(buf, hash, copylen); |
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250 len -= copylen; |
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251 buf += copylen; |
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252 } |
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253 m_burn(hash, sizeof(hash)); |
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254 } |
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255 |
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256 /* Generates a random mp_int. |
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257 * max is a *mp_int specifying an upper bound. |
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258 * rand must be an initialised *mp_int for the result. |
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259 * the result rand satisfies: 0 < rand < max |
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260 * */ |
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261 void gen_random_mpint(mp_int *max, mp_int *rand) { |
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262 |
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263 unsigned char *randbuf = NULL; |
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264 unsigned int len = 0; |
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265 const unsigned char masks[] = {0xff, 0x01, 0x03, 0x07, 0x0f, 0x1f, 0x3f, 0x7f}; |
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266 |
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267 const int size_bits = mp_count_bits(max); |
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268 |
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269 len = size_bits / 8; |
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270 if ((size_bits % 8) != 0) { |
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271 len += 1; |
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272 } |
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273 |
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274 randbuf = (unsigned char*)m_malloc(len); |
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275 do { |
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276 genrandom(randbuf, len); |
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277 /* Mask out the unrequired bits - mp_read_unsigned_bin expects |
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278 * MSB first.*/ |
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279 randbuf[0] &= masks[size_bits % 8]; |
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280 |
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281 bytes_to_mp(rand, randbuf, len); |
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282 |
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283 /* keep regenerating until we get one satisfying |
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284 * 0 < rand < max */ |
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285 } while (mp_cmp(rand, max) != MP_LT); |
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286 m_burn(randbuf, len); |
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287 m_free(randbuf); |
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288 } |