[331] | 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 "internal/cryptlib.h"
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| 11 |
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| 12 | #include <errno.h>
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| 13 | #include <stdio.h>
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| 14 | #include <stdlib.h>
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| 15 | #include <string.h>
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| 16 |
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| 17 | #include <openssl/crypto.h>
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| 18 | #include <openssl/rand.h>
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| 19 | #include <openssl/buffer.h>
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| 20 |
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| 21 | #ifdef OPENSSL_SYS_VMS
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| 22 | # include <unixio.h>
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| 23 | #endif
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| 24 | #ifndef NO_SYS_TYPES_H
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| 25 | # include <sys/types.h>
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| 26 | #endif
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| 27 | #ifndef OPENSSL_NO_POSIX_IO
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| 28 | # include <sys/stat.h>
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| 29 | # include <fcntl.h>
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| 30 | /*
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| 31 | * Following should not be needed, and we could have been stricter
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| 32 | * and demand S_IS*. But some systems just don't comply... Formally
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| 33 | * below macros are "anatomically incorrect", because normally they
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| 34 | * would look like ((m) & MASK == TYPE), but since MASK availability
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| 35 | * is as questionable, we settle for this poor-man fallback...
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| 36 | */
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| 37 | # if !defined(S_ISBLK)
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| 38 | # if defined(_S_IFBLK)
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| 39 | # define S_ISBLK(m) ((m) & _S_IFBLK)
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| 40 | # elif defined(S_IFBLK)
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| 41 | # define S_ISBLK(m) ((m) & S_IFBLK)
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| 42 | # elif defined(_WIN32)
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| 43 | # define S_ISBLK(m) 0 /* no concept of block devices on Windows */
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| 44 | # endif
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| 45 | # endif
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| 46 | # if !defined(S_ISCHR)
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| 47 | # if defined(_S_IFCHR)
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| 48 | # define S_ISCHR(m) ((m) & _S_IFCHR)
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| 49 | # elif defined(S_IFCHR)
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| 50 | # define S_ISCHR(m) ((m) & S_IFCHR)
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| 51 | # endif
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| 52 | # endif
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| 53 | #endif
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| 54 |
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| 55 | #ifdef _WIN32
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| 56 | # define stat _stat
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| 57 | # define chmod _chmod
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| 58 | # define open _open
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| 59 | # define fdopen _fdopen
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| 60 | # define fstat _fstat
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| 61 | # define fileno _fileno
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| 62 | #endif
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| 63 |
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| 64 | #undef BUFSIZE
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| 65 | #define BUFSIZE 1024
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| 66 | #define RAND_DATA 1024
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| 67 |
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| 68 | #ifdef OPENSSL_SYS_VMS
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| 69 | /*
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| 70 | * Misc hacks needed for specific cases.
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| 71 | *
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| 72 | * __FILE_ptr32 is a type provided by DEC C headers (types.h specifically)
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| 73 | * to make sure the FILE* is a 32-bit pointer no matter what. We know that
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| 74 | * stdio function return this type (a study of stdio.h proves it).
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| 75 | * Additionally, we create a similar char pointer type for the sake of
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| 76 | * vms_setbuf below.
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| 77 | */
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| 78 | # if __INITIAL_POINTER_SIZE == 64
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| 79 | # pragma pointer_size save
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| 80 | # pragma pointer_size 32
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| 81 | typedef char *char_ptr32;
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| 82 | # pragma pointer_size restore
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| 83 | /*
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| 84 | * On VMS, setbuf() will only take 32-bit pointers, and a compilation
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| 85 | * with /POINTER_SIZE=64 will give off a MAYLOSEDATA2 warning here.
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| 86 | * Since we know that the FILE* really is a 32-bit pointer expanded to
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| 87 | * 64 bits, we also know it's safe to convert it back to a 32-bit pointer.
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| 88 | * As for the buffer parameter, we only use NULL here, so that passes as
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| 89 | * well...
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| 90 | */
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| 91 | # define setbuf(fp,buf) (setbuf)((__FILE_ptr32)(fp), (char_ptr32)(buf))
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| 92 | # endif
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| 93 |
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| 94 | /*
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| 95 | * This declaration is a nasty hack to get around vms' extension to fopen for
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| 96 | * passing in sharing options being disabled by /STANDARD=ANSI89
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| 97 | */
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| 98 | static __FILE_ptr32 (*const vms_fopen)(const char *, const char *, ...) =
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| 99 | (__FILE_ptr32 (*)(const char *, const char *, ...))fopen;
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| 100 | # define VMS_OPEN_ATTRS "shr=get,put,upd,del","ctx=bin,stm","rfm=stm","rat=none","mrs=0"
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| 101 |
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| 102 | # define openssl_fopen(fname,mode) vms_fopen((fname), (mode), VMS_OPEN_ATTRS)
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| 103 | #endif
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| 104 |
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| 105 | #define RFILE ".rnd"
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| 106 |
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| 107 | /*
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| 108 | * Note that these functions are intended for seed files only. Entropy
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| 109 | * devices and EGD sockets are handled in rand_unix.c
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| 110 | */
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| 111 |
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| 112 | int RAND_load_file(const char *file, long bytes)
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| 113 | {
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| 114 | /*-
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| 115 | * If bytes >= 0, read up to 'bytes' bytes.
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| 116 | * if bytes == -1, read complete file.
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| 117 | */
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| 118 |
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| 119 | unsigned char buf[BUFSIZE];
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| 120 | #ifndef OPENSSL_NO_POSIX_IO
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| 121 | struct stat sb;
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| 122 | #endif
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| 123 | int i, ret = 0, n;
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| 124 | FILE *in = NULL;
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| 125 |
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| 126 | if (file == NULL)
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| 127 | return 0;
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| 128 |
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| 129 | if (bytes == 0)
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| 130 | return ret;
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| 131 |
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| 132 | in = openssl_fopen(file, "rb");
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| 133 | if (in == NULL)
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| 134 | goto err;
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| 135 |
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| 136 | #ifndef OPENSSL_NO_POSIX_IO
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| 137 | /*
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| 138 | * struct stat can have padding and unused fields that may not be
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| 139 | * initialized in the call to stat(). We need to clear the entire
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| 140 | * structure before calling RAND_add() to avoid complaints from
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| 141 | * applications such as Valgrind.
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| 142 | */
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| 143 | memset(&sb, 0, sizeof(sb));
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| 144 | if (fstat(fileno(in), &sb) < 0)
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| 145 | goto err;
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| 146 | RAND_add(&sb, sizeof(sb), 0.0);
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| 147 |
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| 148 | # if defined(S_ISBLK) && defined(S_ISCHR)
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| 149 | if (S_ISBLK(sb.st_mode) || S_ISCHR(sb.st_mode)) {
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| 150 | /*
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| 151 | * this file is a device. we don't want read an infinite number of
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| 152 | * bytes from a random device, nor do we want to use buffered I/O
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| 153 | * because we will waste system entropy.
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| 154 | */
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| 155 | bytes = (bytes == -1) ? 2048 : bytes; /* ok, is 2048 enough? */
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| 156 | setbuf(in, NULL); /* don't do buffered reads */
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| 157 | }
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| 158 | # endif
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| 159 | #endif
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| 160 | for (;;) {
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| 161 | if (bytes > 0)
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| 162 | n = (bytes < BUFSIZE) ? (int)bytes : BUFSIZE;
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| 163 | else
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| 164 | n = BUFSIZE;
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| 165 | i = fread(buf, 1, n, in);
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| 166 | if (i <= 0)
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| 167 | break;
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| 168 |
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| 169 | RAND_add(buf, i, (double)i);
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| 170 | ret += i;
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| 171 | if (bytes > 0) {
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| 172 | bytes -= n;
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| 173 | if (bytes <= 0)
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| 174 | break;
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| 175 | }
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| 176 | }
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| 177 | OPENSSL_cleanse(buf, BUFSIZE);
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| 178 | err:
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| 179 | if (in != NULL)
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| 180 | fclose(in);
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| 181 | return ret;
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| 182 | }
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| 183 |
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| 184 | int RAND_write_file(const char *file)
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| 185 | {
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| 186 | unsigned char buf[BUFSIZE];
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| 187 | int i, ret = 0, rand_err = 0;
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| 188 | FILE *out = NULL;
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| 189 | int n;
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| 190 | #ifndef OPENSSL_NO_POSIX_IO
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| 191 | struct stat sb;
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| 192 |
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| 193 | # if defined(S_ISBLK) && defined(S_ISCHR)
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| 194 | # ifdef _WIN32
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| 195 | /*
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| 196 | * Check for |file| being a driver as "ASCII-safe" on Windows,
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| 197 | * because driver paths are always ASCII.
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| 198 | */
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| 199 | # endif
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| 200 | i = stat(file, &sb);
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| 201 | if (i != -1) {
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| 202 | if (S_ISBLK(sb.st_mode) || S_ISCHR(sb.st_mode)) {
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| 203 | /*
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| 204 | * this file is a device. we don't write back to it. we
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| 205 | * "succeed" on the assumption this is some sort of random
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| 206 | * device. Otherwise attempting to write to and chmod the device
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| 207 | * causes problems.
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| 208 | */
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| 209 | return 1;
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| 210 | }
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| 211 | }
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| 212 | # endif
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| 213 | #endif
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| 214 |
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| 215 | #if defined(O_CREAT) && !defined(OPENSSL_NO_POSIX_IO) && \
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| 216 | !defined(OPENSSL_SYS_VMS) && !defined(OPENSSL_SYS_WINDOWS)
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| 217 | {
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| 218 | # ifndef O_BINARY
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| 219 | # define O_BINARY 0
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| 220 | # endif
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| 221 | /*
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| 222 | * chmod(..., 0600) is too late to protect the file, permissions
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| 223 | * should be restrictive from the start
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| 224 | */
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| 225 | int fd = open(file, O_WRONLY | O_CREAT | O_BINARY, 0600);
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| 226 | if (fd != -1)
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| 227 | out = fdopen(fd, "wb");
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| 228 | }
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| 229 | #endif
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| 230 |
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| 231 | #ifdef OPENSSL_SYS_VMS
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| 232 | /*
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| 233 | * VMS NOTE: Prior versions of this routine created a _new_ version of
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| 234 | * the rand file for each call into this routine, then deleted all
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| 235 | * existing versions named ;-1, and finally renamed the current version
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| 236 | * as ';1'. Under concurrent usage, this resulted in an RMS race
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| 237 | * condition in rename() which could orphan files (see vms message help
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| 238 | * for RMS$_REENT). With the fopen() calls below, openssl/VMS now shares
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| 239 | * the top-level version of the rand file. Note that there may still be
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| 240 | * conditions where the top-level rand file is locked. If so, this code
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| 241 | * will then create a new version of the rand file. Without the delete
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| 242 | * and rename code, this can result in ascending file versions that stop
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| 243 | * at version 32767, and this routine will then return an error. The
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| 244 | * remedy for this is to recode the calling application to avoid
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| 245 | * concurrent use of the rand file, or synchronize usage at the
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| 246 | * application level. Also consider whether or not you NEED a persistent
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| 247 | * rand file in a concurrent use situation.
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| 248 | */
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| 249 |
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| 250 | out = openssl_fopen(file, "rb+");
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| 251 | #endif
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| 252 | if (out == NULL)
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| 253 | out = openssl_fopen(file, "wb");
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| 254 | if (out == NULL)
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| 255 | goto err;
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| 256 |
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| 257 | #if !defined(NO_CHMOD) && !defined(OPENSSL_NO_POSIX_IO)
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| 258 | chmod(file, 0600);
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| 259 | #endif
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| 260 | n = RAND_DATA;
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| 261 | for (;;) {
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| 262 | i = (n > BUFSIZE) ? BUFSIZE : n;
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| 263 | n -= BUFSIZE;
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| 264 | if (RAND_bytes(buf, i) <= 0)
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| 265 | rand_err = 1;
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| 266 | i = fwrite(buf, 1, i, out);
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| 267 | if (i <= 0) {
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| 268 | ret = 0;
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| 269 | break;
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| 270 | }
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| 271 | ret += i;
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| 272 | if (n <= 0)
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| 273 | break;
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| 274 | }
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| 275 |
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| 276 | fclose(out);
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| 277 | OPENSSL_cleanse(buf, BUFSIZE);
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| 278 | err:
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| 279 | return (rand_err ? -1 : ret);
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| 280 | }
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| 281 |
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| 282 | const char *RAND_file_name(char *buf, size_t size)
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| 283 | {
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| 284 | char *s = NULL;
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| 285 | int use_randfile = 1;
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| 286 | #ifdef __OpenBSD__
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| 287 | struct stat sb;
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| 288 | #endif
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| 289 |
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| 290 | #if defined(_WIN32) && defined(CP_UTF8)
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| 291 | DWORD len;
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| 292 | WCHAR *var, *val;
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| 293 |
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| 294 | if ((var = L"RANDFILE",
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| 295 | len = GetEnvironmentVariableW(var, NULL, 0)) == 0
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| 296 | && (var = L"HOME", use_randfile = 0,
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| 297 | len = GetEnvironmentVariableW(var, NULL, 0)) == 0
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| 298 | && (var = L"USERPROFILE",
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| 299 | len = GetEnvironmentVariableW(var, NULL, 0)) == 0) {
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| 300 | var = L"SYSTEMROOT",
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| 301 | len = GetEnvironmentVariableW(var, NULL, 0);
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| 302 | }
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| 303 |
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| 304 | if (len != 0) {
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| 305 | int sz;
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| 306 |
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| 307 | val = _alloca(len * sizeof(WCHAR));
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| 308 |
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| 309 | if (GetEnvironmentVariableW(var, val, len) < len
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| 310 | && (sz = WideCharToMultiByte(CP_UTF8, 0, val, -1, NULL, 0,
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| 311 | NULL, NULL)) != 0) {
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| 312 | s = _alloca(sz);
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| 313 | if (WideCharToMultiByte(CP_UTF8, 0, val, -1, s, sz,
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| 314 | NULL, NULL) == 0)
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| 315 | s = NULL;
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| 316 | }
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| 317 | }
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| 318 | #else
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| 319 | if (OPENSSL_issetugid() != 0) {
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| 320 | use_randfile = 0;
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| 321 | } else {
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| 322 | s = getenv("RANDFILE");
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| 323 | if (s == NULL || *s == '\0') {
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| 324 | use_randfile = 0;
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| 325 | s = getenv("HOME");
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| 326 | }
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| 327 | }
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| 328 | #endif
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| 329 | #ifdef DEFAULT_HOME
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| 330 | if (!use_randfile && s == NULL) {
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| 331 | s = DEFAULT_HOME;
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| 332 | }
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| 333 | #endif
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| 334 | if (s != NULL && *s) {
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| 335 | size_t len = strlen(s);
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| 336 |
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| 337 | if (use_randfile && len + 1 < size) {
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| 338 | if (OPENSSL_strlcpy(buf, s, size) >= size)
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| 339 | return NULL;
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| 340 | } else if (len + strlen(RFILE) + 2 < size) {
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| 341 | OPENSSL_strlcpy(buf, s, size);
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| 342 | #ifndef OPENSSL_SYS_VMS
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| 343 | OPENSSL_strlcat(buf, "/", size);
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| 344 | #endif
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| 345 | OPENSSL_strlcat(buf, RFILE, size);
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| 346 | }
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| 347 | } else {
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| 348 | buf[0] = '\0'; /* no file name */
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| 349 | }
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| 350 |
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| 351 | #ifdef __OpenBSD__
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| 352 | /*
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| 353 | * given that all random loads just fail if the file can't be seen on a
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| 354 | * stat, we stat the file we're returning, if it fails, use /dev/arandom
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| 355 | * instead. this allows the user to use their own source for good random
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| 356 | * data, but defaults to something hopefully decent if that isn't
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| 357 | * available.
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| 358 | */
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| 359 |
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| 360 | if (!buf[0] || stat(buf, &sb) == -1)
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| 361 | if (OPENSSL_strlcpy(buf, "/dev/arandom", size) >= size) {
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| 362 | return NULL;
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| 363 | }
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| 364 | #endif
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| 365 | return buf[0] ? buf : NULL;
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| 366 | }
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