Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/curl/lib/rand.c @ 7:5ab937c03c27

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Apply full RELRO to all generated binaries. Also strip the generated binaries.
author Franz Glasner <fzglas.hg@dom66.de>
date Tue, 16 Sep 2025 12:37:32 +0200
parents b50eed0cc0ef
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
2
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1 /***************************************************************************
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2 * _ _ ____ _
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3 * Project ___| | | | _ \| |
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4 * / __| | | | |_) | |
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5 * | (__| |_| | _ <| |___
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6 * \___|\___/|_| \_\_____|
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7 *
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8 * Copyright (C) 1998 - 2019, Daniel Stenberg, <daniel@haxx.se>, et al.
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9 *
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10 * This software is licensed as described in the file COPYING, which
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11 * you should have received as part of this distribution. The terms
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12 * are also available at https://curl.haxx.se/docs/copyright.html.
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13 *
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14 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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15 * copies of the Software, and permit persons to whom the Software is
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16 * furnished to do so, under the terms of the COPYING file.
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17 *
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18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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19 * KIND, either express or implied.
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20 *
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21 ***************************************************************************/
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22
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23 #include "curl_setup.h"
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24
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25 #ifdef HAVE_FCNTL_H
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26 #include <fcntl.h>
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27 #endif
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28
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29 #include <curl/curl.h>
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30 #include "vtls/vtls.h"
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31 #include "sendf.h"
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32 #include "rand.h"
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33
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34 /* The last 3 #include files should be in this order */
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35 #include "curl_printf.h"
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36 #include "curl_memory.h"
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37 #include "memdebug.h"
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38
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39 static CURLcode randit(struct Curl_easy *data, unsigned int *rnd)
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40 {
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41 unsigned int r;
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42 CURLcode result = CURLE_OK;
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43 static unsigned int randseed;
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44 static bool seeded = FALSE;
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45
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46 #ifdef CURLDEBUG
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47 char *force_entropy = getenv("CURL_ENTROPY");
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48 if(force_entropy) {
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49 if(!seeded) {
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50 unsigned int seed = 0;
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51 size_t elen = strlen(force_entropy);
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52 size_t clen = sizeof(seed);
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53 size_t min = elen < clen ? elen : clen;
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54 memcpy((char *)&seed, force_entropy, min);
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55 randseed = ntohl(seed);
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56 seeded = TRUE;
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57 }
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58 else
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59 randseed++;
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60 *rnd = randseed;
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61 return CURLE_OK;
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62 }
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63 #endif
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64
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65 /* data may be NULL! */
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66 result = Curl_ssl_random(data, (unsigned char *)rnd, sizeof(*rnd));
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67 if(result != CURLE_NOT_BUILT_IN)
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68 /* only if there is no random function in the TLS backend do the non crypto
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69 version, otherwise return result */
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70 return result;
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71
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72 /* ---- non-cryptographic version following ---- */
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73
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74 #ifdef RANDOM_FILE
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75 if(!seeded) {
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76 /* if there's a random file to read a seed from, use it */
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77 int fd = open(RANDOM_FILE, O_RDONLY);
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78 if(fd > -1) {
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79 /* read random data into the randseed variable */
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80 ssize_t nread = read(fd, &randseed, sizeof(randseed));
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81 if(nread == sizeof(randseed))
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82 seeded = TRUE;
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83 close(fd);
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84 }
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85 }
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86 #endif
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87
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88 if(!seeded) {
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89 struct curltime now = Curl_now();
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90 infof(data, "WARNING: Using weak random seed\n");
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91 randseed += (unsigned int)now.tv_usec + (unsigned int)now.tv_sec;
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92 randseed = randseed * 1103515245 + 12345;
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93 randseed = randseed * 1103515245 + 12345;
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94 randseed = randseed * 1103515245 + 12345;
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95 seeded = TRUE;
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96 }
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97
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98 /* Return an unsigned 32-bit pseudo-random number. */
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99 r = randseed = randseed * 1103515245 + 12345;
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100 *rnd = (r << 16) | ((r >> 16) & 0xFFFF);
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101 return CURLE_OK;
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102 }
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103
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104 /*
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105 * Curl_rand() stores 'num' number of random unsigned integers in the buffer
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106 * 'rndptr' points to.
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107 *
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108 * If libcurl is built without TLS support or with a TLS backend that lacks a
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109 * proper random API (Gskit or mbedTLS), this function will use "weak" random.
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110 *
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111 * When built *with* TLS support and a backend that offers strong random, it
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112 * will return error if it cannot provide strong random values.
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113 *
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114 * NOTE: 'data' may be passed in as NULL when coming from external API without
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115 * easy handle!
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116 *
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117 */
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118
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Franz Glasner <fzglas.hg@dom66.de>
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119 CURLcode Curl_rand(struct Curl_easy *data, unsigned char *rnd, size_t num)
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120 {
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121 CURLcode result = CURLE_BAD_FUNCTION_ARGUMENT;
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122
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123 DEBUGASSERT(num > 0);
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124
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125 while(num) {
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126 unsigned int r;
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127 size_t left = num < sizeof(unsigned int) ? num : sizeof(unsigned int);
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128
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129 result = randit(data, &r);
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130 if(result)
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131 return result;
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132
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133 while(left) {
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134 *rnd++ = (unsigned char)(r & 0xFF);
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135 r >>= 8;
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136 --num;
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137 --left;
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138 }
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139 }
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140
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141 return result;
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142 }
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143
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144 /*
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145 * Curl_rand_hex() fills the 'rnd' buffer with a given 'num' size with random
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146 * hexadecimal digits PLUS a zero terminating byte. It must be an odd number
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147 * size.
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148 */
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149
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150 CURLcode Curl_rand_hex(struct Curl_easy *data, unsigned char *rnd,
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parents:
diff changeset
151 size_t num)
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parents:
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152 {
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153 CURLcode result = CURLE_BAD_FUNCTION_ARGUMENT;
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154 const char *hex = "0123456789abcdef";
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parents:
diff changeset
155 unsigned char buffer[128];
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156 unsigned char *bufp = buffer;
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parents:
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157 DEBUGASSERT(num > 1);
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158
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159 #ifdef __clang_analyzer__
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160 /* This silences a scan-build warning about accessing this buffer with
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parents:
diff changeset
161 uninitialized memory. */
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
162 memset(buffer, 0, sizeof(buffer));
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163 #endif
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164
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parents:
diff changeset
165 if((num/2 >= sizeof(buffer)) || !(num&1))
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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166 /* make sure it fits in the local buffer and that it is an odd number! */
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
167 return CURLE_BAD_FUNCTION_ARGUMENT;
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parents:
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168
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
169 num--; /* save one for zero termination */
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parents:
diff changeset
170
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parents:
diff changeset
171 result = Curl_rand(data, buffer, num/2);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
172 if(result)
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
173 return result;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
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174
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parents:
diff changeset
175 while(num) {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
176 /* clang-tidy warns on this line without this comment: */
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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177 /* NOLINTNEXTLINE(clang-analyzer-core.UndefinedBinaryOperatorResult) */
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
178 *rnd++ = hex[(*bufp & 0xF0)>>4];
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
179 *rnd++ = hex[*bufp & 0x0F];
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
180 bufp++;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
181 num -= 2;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
182 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
183 *rnd = 0;
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parents:
diff changeset
184
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
185 return result;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
186 }