Rizin
unix-like reverse engineering framework and cli tools
zip_random_unix.c
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1 /*
2  zip_random_unix.c -- fill the user's buffer with random stuff (Unix version)
3  Copyright (C) 2016-2021 Dieter Baron and Thomas Klausner
4 
5  This file is part of libzip, a library to manipulate ZIP archives.
6  The authors can be contacted at <info@libzip.org>
7 
8  Redistribution and use in source and binary forms, with or without
9  modification, are permitted provided that the following conditions
10  are met:
11  1. Redistributions of source code must retain the above copyright
12  notice, this list of conditions and the following disclaimer.
13  2. Redistributions in binary form must reproduce the above copyright
14  notice, this list of conditions and the following disclaimer in
15  the documentation and/or other materials provided with the
16  distribution.
17  3. The names of the authors may not be used to endorse or promote
18  products derived from this software without specific prior
19  written permission.
20 
21  THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS
22  OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
23  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24  ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
25  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
27  GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
29  IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
30  OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
31  IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 */
33 
34 #include "zipint.h"
35 
36 #ifdef HAVE_CRYPTO
37 #include "zip_crypto.h"
38 #endif
39 
40 #ifdef HAVE_ARC4RANDOM
41 
42 #include <stdlib.h>
43 
44 #ifndef HAVE_SECURE_RANDOM
45 ZIP_EXTERN bool
46 zip_secure_random(zip_uint8_t *buffer, zip_uint16_t length) {
47  arc4random_buf(buffer, length);
48  return true;
49 }
50 #endif
51 
52 #ifndef HAVE_RANDOM_UINT32
53 zip_uint32_t
54 zip_random_uint32(void) {
55  return arc4random();
56 }
57 #endif
58 
59 #else /* HAVE_ARC4RANDOM */
60 
61 #ifndef HAVE_SECURE_RANDOM
62 #include <fcntl.h>
63 #include <unistd.h>
64 
65 ZIP_EXTERN bool
66 zip_secure_random(zip_uint8_t *buffer, zip_uint16_t length) {
67  int fd;
68 
69  if ((fd = open("/dev/urandom", O_RDONLY)) < 0) {
70  return false;
71  }
72 
73  if (read(fd, buffer, length) != length) {
74  close(fd);
75  return false;
76  }
77 
78  close(fd);
79  return true;
80 }
81 #endif
82 
83 #ifndef HAVE_RANDOM_UINT32
84 #include <stdlib.h>
85 
86 zip_uint32_t
87 zip_random_uint32(void) {
88  static bool seeded = false;
89 
90  zip_uint32_t value;
91 
92  if (zip_secure_random((zip_uint8_t *)&value, sizeof(value))) {
93  return value;
94  }
95 
96  if (!seeded) {
97  srandom((unsigned int)time(NULL));
98  }
99 
100  return (zip_uint32_t)random();
101 }
102 #endif
103 
104 #endif /* HAVE_ARC4RANDOM */
value
static int value
Definition: cmd_api.c:93
NULL
#define NULL
Definition: cris-opc.c:27
close
static static fork const void static count close
Definition: sflib.h:33
length
static static sync static getppid static getegid const char static filename char static len const char char static bufsiz static mask static vfork const void static prot static getpgrp const char static swapflags static arg static fd static protocol static who struct sockaddr static addrlen static backlog struct timeval struct timezone static tz const struct iovec static count static mode const void const struct sockaddr static tolen const char static pathname void static offset struct stat static buf void long static basep static whence static length const void static len static semflg const void static shmflg const struct timespec struct timespec static rem const char static group const void length
Definition: sflib.h:133
ZIP_EXTERN
#define ZIP_EXTERN
Definition: zip.h:54
time
static static fork const void static count static fd const char const char static newpath char char char static envp time
Definition: sflib.h:42
O_RDONLY
#define O_RDONLY
Definition: sftypes.h:486
buffer
Definition: buffer.h:15
fd
static const z80_opcode fd[]
Definition: z80_tab.h:997
zip_crypto.h
zip_random_uint32
zip_uint32_t zip_random_uint32(void)
Definition: zip_random_unix.c:87
zip_secure_random
ZIP_EXTERN bool zip_secure_random(zip_uint8_t *buffer, zip_uint16_t length)
Definition: zip_random_unix.c:66
zip_uint32_t
uint32_t zip_uint32_t
Definition: zipconf.h:37
zip_uint8_t
uint8_t zip_uint8_t
Definition: zipconf.h:33
zip_uint16_t
uint16_t zip_uint16_t
Definition: zipconf.h:35
read
int read(izstream &zs, T *x, Items items)
Definition: zstream.h:115