1 | /*
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2 | * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
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3 | *
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4 | * Licensed under the OpenSSL license (the "License"). You may not use
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5 | * this file except in compliance with the License. You can obtain a copy
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6 | * in the file LICENSE in the source distribution or at
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7 | * https://www.openssl.org/source/license.html
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8 | */
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9 |
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10 | #include <stdio.h>
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11 |
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12 | #define USE_SOCKETS
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13 | #include "e_os.h"
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14 | #include "internal/cryptlib.h"
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15 | #include <openssl/rand.h>
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16 | #include "rand_lcl.h"
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17 |
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18 | #if !(defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32) || defined(OPENSSL_SYS_VMS) || defined(OPENSSL_SYS_VXWORKS) || defined(OPENSSL_SYS_UEFI))
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19 |
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20 | # include <sys/types.h>
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21 | # include <sys/time.h>
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22 | # include <sys/times.h>
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23 | # include <sys/stat.h>
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24 | # include <fcntl.h>
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25 | # include <unistd.h>
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26 | # include <time.h>
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27 | # if defined(OPENSSL_SYS_LINUX) /* should actually be available virtually
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28 | * everywhere */
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29 | # include <poll.h>
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30 | # endif
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31 | # include <limits.h>
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32 | # ifndef FD_SETSIZE
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33 | # define FD_SETSIZE (8*sizeof(fd_set))
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34 | # endif
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35 |
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36 | # if defined(OPENSSL_SYS_VOS)
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37 |
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38 | /*
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39 | * The following algorithm repeatedly samples the real-time clock (RTC) to
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40 | * generate a sequence of unpredictable data. The algorithm relies upon the
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41 | * uneven execution speed of the code (due to factors such as cache misses,
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42 | * interrupts, bus activity, and scheduling) and upon the rather large
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43 | * relative difference between the speed of the clock and the rate at which
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44 | * it can be read.
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45 | *
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46 | * If this code is ported to an environment where execution speed is more
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47 | * constant or where the RTC ticks at a much slower rate, or the clock can be
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48 | * read with fewer instructions, it is likely that the results would be far
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49 | * more predictable.
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50 | *
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51 | * As a precaution, we generate 4 times the minimum required amount of seed
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52 | * data.
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53 | */
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54 |
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55 | int RAND_poll(void)
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56 | {
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57 | short int code;
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58 | gid_t curr_gid;
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59 | pid_t curr_pid;
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60 | uid_t curr_uid;
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61 | int i, k;
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62 | struct timespec ts;
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63 | unsigned char v;
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64 |
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65 | # ifdef OPENSSL_SYS_VOS_HPPA
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66 | long duration;
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67 | extern void s$sleep(long *_duration, short int *_code);
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68 | # else
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69 | # ifdef OPENSSL_SYS_VOS_IA32
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70 | long long duration;
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71 | extern void s$sleep2(long long *_duration, short int *_code);
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72 | # else
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73 | # error "Unsupported Platform."
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74 | # endif /* OPENSSL_SYS_VOS_IA32 */
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75 | # endif /* OPENSSL_SYS_VOS_HPPA */
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76 |
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77 | /*
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78 | * Seed with the gid, pid, and uid, to ensure *some* variation between
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79 | * different processes.
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80 | */
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81 |
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82 | curr_gid = getgid();
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83 | RAND_add(&curr_gid, sizeof curr_gid, 1);
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84 | curr_gid = 0;
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85 |
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86 | curr_pid = getpid();
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87 | RAND_add(&curr_pid, sizeof curr_pid, 1);
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88 | curr_pid = 0;
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89 |
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90 | curr_uid = getuid();
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91 | RAND_add(&curr_uid, sizeof curr_uid, 1);
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92 | curr_uid = 0;
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93 |
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94 | for (i = 0; i < (ENTROPY_NEEDED * 4); i++) {
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95 | /*
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96 | * burn some cpu; hope for interrupts, cache collisions, bus
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97 | * interference, etc.
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98 | */
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99 | for (k = 0; k < 99; k++)
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100 | ts.tv_nsec = random();
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101 |
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102 | # ifdef OPENSSL_SYS_VOS_HPPA
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103 | /* sleep for 1/1024 of a second (976 us). */
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104 | duration = 1;
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105 | s$sleep(&duration, &code);
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106 | # else
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107 | # ifdef OPENSSL_SYS_VOS_IA32
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108 | /* sleep for 1/65536 of a second (15 us). */
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109 | duration = 1;
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110 | s$sleep2(&duration, &code);
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111 | # endif /* OPENSSL_SYS_VOS_IA32 */
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112 | # endif /* OPENSSL_SYS_VOS_HPPA */
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113 |
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114 | /* get wall clock time. */
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115 | clock_gettime(CLOCK_REALTIME, &ts);
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116 |
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117 | /* take 8 bits */
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118 | v = (unsigned char)(ts.tv_nsec % 256);
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119 | RAND_add(&v, sizeof v, 1);
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120 | v = 0;
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121 | }
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122 | return 1;
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123 | }
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124 | # elif defined __OpenBSD__
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125 | int RAND_poll(void)
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126 | {
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127 | u_int32_t rnd = 0, i;
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128 | unsigned char buf[ENTROPY_NEEDED];
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129 |
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130 | for (i = 0; i < sizeof(buf); i++) {
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131 | if (i % 4 == 0)
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132 | rnd = arc4random();
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133 | buf[i] = rnd;
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134 | rnd >>= 8;
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135 | }
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136 | RAND_add(buf, sizeof(buf), ENTROPY_NEEDED);
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137 | OPENSSL_cleanse(buf, sizeof(buf));
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138 |
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139 | return 1;
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140 | }
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141 | # else /* !defined(__OpenBSD__) */
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142 | int RAND_poll(void)
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143 | {
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144 | unsigned long l;
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145 | pid_t curr_pid = getpid();
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146 | # if defined(DEVRANDOM) || (!defined(OPENSS_NO_EGD) && defined(DEVRANDOM_EGD))
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147 | unsigned char tmpbuf[ENTROPY_NEEDED];
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148 | int n = 0;
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149 | # endif
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150 | # ifdef DEVRANDOM
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151 | static const char *randomfiles[] = { DEVRANDOM };
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152 | struct stat randomstats[OSSL_NELEM(randomfiles)];
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153 | int fd;
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154 | unsigned int i;
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155 | # endif
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156 | # if !defined(OPENSSL_NO_EGD) && defined(DEVRANDOM_EGD)
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157 | static const char *egdsockets[] = { DEVRANDOM_EGD, NULL };
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158 | const char **egdsocket = NULL;
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159 | # endif
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160 |
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161 | # ifdef DEVRANDOM
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162 | memset(randomstats, 0, sizeof(randomstats));
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163 | /*
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164 | * Use a random entropy pool device. Linux, FreeBSD and OpenBSD have
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165 | * this. Use /dev/urandom if you can as /dev/random may block if it runs
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166 | * out of random entries.
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167 | */
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168 |
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169 | for (i = 0; (i < OSSL_NELEM(randomfiles)) && (n < ENTROPY_NEEDED); i++) {
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170 | if ((fd = open(randomfiles[i], O_RDONLY
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171 | # ifdef O_NONBLOCK
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172 | | O_NONBLOCK
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173 | # endif
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174 | # ifdef O_BINARY
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175 | | O_BINARY
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176 | # endif
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177 | # ifdef O_NOCTTY /* If it happens to be a TTY (god forbid), do
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178 | * not make it our controlling tty */
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179 | | O_NOCTTY
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180 | # endif
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181 | )) >= 0) {
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182 | int usec = 10 * 1000; /* spend 10ms on each file */
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183 | int r;
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184 | unsigned int j;
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185 | struct stat *st = &randomstats[i];
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186 |
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187 | /*
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188 | * Avoid using same input... Used to be O_NOFOLLOW above, but
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189 | * it's not universally appropriate...
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190 | */
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191 | if (fstat(fd, st) != 0) {
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192 | close(fd);
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193 | continue;
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194 | }
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195 | for (j = 0; j < i; j++) {
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196 | if (randomstats[j].st_ino == st->st_ino &&
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197 | randomstats[j].st_dev == st->st_dev)
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198 | break;
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199 | }
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200 | if (j < i) {
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201 | close(fd);
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202 | continue;
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203 | }
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204 |
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205 | do {
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206 | int try_read = 0;
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207 |
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208 | # if defined(OPENSSL_SYS_LINUX)
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209 | /* use poll() */
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210 | struct pollfd pset;
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211 |
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212 | pset.fd = fd;
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213 | pset.events = POLLIN;
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214 | pset.revents = 0;
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215 |
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216 | if (poll(&pset, 1, usec / 1000) < 0)
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217 | usec = 0;
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218 | else
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219 | try_read = (pset.revents & POLLIN) != 0;
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220 |
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221 | # else
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222 | /* use select() */
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223 | fd_set fset;
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224 | struct timeval t;
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225 |
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226 | t.tv_sec = 0;
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227 | t.tv_usec = usec;
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228 |
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229 | if (FD_SETSIZE > 0 && (unsigned)fd >= FD_SETSIZE) {
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230 | /*
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231 | * can't use select, so just try to read once anyway
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232 | */
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233 | try_read = 1;
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234 | } else {
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235 | FD_ZERO(&fset);
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236 | FD_SET(fd, &fset);
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237 |
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238 | if (select(fd + 1, &fset, NULL, NULL, &t) >= 0) {
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239 | usec = t.tv_usec;
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240 | if (FD_ISSET(fd, &fset))
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241 | try_read = 1;
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242 | } else
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243 | usec = 0;
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244 | }
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245 | # endif
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246 |
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247 | if (try_read) {
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248 | r = read(fd, (unsigned char *)tmpbuf + n,
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249 | ENTROPY_NEEDED - n);
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250 | if (r > 0)
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251 | n += r;
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252 | } else
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253 | r = -1;
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254 |
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255 | /*
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256 | * Some Unixen will update t in select(), some won't. For
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257 | * those who won't, or if we didn't use select() in the first
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258 | * place, give up here, otherwise, we will do this once again
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259 | * for the remaining time.
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260 | */
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261 | if (usec == 10 * 1000)
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262 | usec = 0;
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263 | }
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264 | while ((r > 0 ||
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265 | (errno == EINTR || errno == EAGAIN)) && usec != 0
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266 | && n < ENTROPY_NEEDED);
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267 |
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268 | close(fd);
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269 | }
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270 | }
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271 | # endif /* defined(DEVRANDOM) */
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272 |
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273 | # if !defined(OPENSSL_NO_EGD) && defined(DEVRANDOM_EGD)
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274 | /*
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275 | * Use an EGD socket to read entropy from an EGD or PRNGD entropy
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276 | * collecting daemon.
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277 | */
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278 |
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279 | for (egdsocket = egdsockets; *egdsocket && n < ENTROPY_NEEDED;
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280 | egdsocket++) {
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281 | int r;
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282 |
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283 | r = RAND_query_egd_bytes(*egdsocket, (unsigned char *)tmpbuf + n,
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284 | ENTROPY_NEEDED - n);
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285 | if (r > 0)
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286 | n += r;
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287 | }
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288 | # endif /* defined(DEVRANDOM_EGD) */
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289 |
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290 | # if defined(DEVRANDOM) || (!defined(OPENSSL_NO_EGD) && defined(DEVRANDOM_EGD))
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291 | if (n > 0) {
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292 | RAND_add(tmpbuf, sizeof tmpbuf, (double)n);
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293 | OPENSSL_cleanse(tmpbuf, n);
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294 | }
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295 | # endif
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296 |
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297 | /* put in some default random data, we need more than just this */
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298 | l = curr_pid;
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299 | RAND_add(&l, sizeof(l), 0.0);
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300 | l = getuid();
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301 | RAND_add(&l, sizeof(l), 0.0);
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302 |
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303 | l = time(NULL);
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304 | RAND_add(&l, sizeof(l), 0.0);
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305 |
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306 | # if defined(DEVRANDOM) || (!defined(OPENSSL_NO_EGD) && defined(DEVRANDOM_EGD))
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307 | return 1;
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308 | # else
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309 | return 0;
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310 | # endif
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311 | }
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312 |
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313 | # endif /* defined(__OpenBSD__) */
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314 | #endif /* !(defined(OPENSSL_SYS_WINDOWS) ||
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315 | * defined(OPENSSL_SYS_WIN32) ||
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316 | * defined(OPENSSL_SYS_VMS) ||
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317 | * defined(OPENSSL_SYS_VXWORKS) */
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318 |
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319 | #if defined(OPENSSL_SYS_VXWORKS) || defined(OPENSSL_SYS_UEFI)
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320 | int RAND_poll(void)
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321 | {
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322 | return 0;
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323 | }
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324 | #endif
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