/usr/share/doc/nettle-dev/examples/io.c is in nettle-dev 2.7.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 | /* io.c
*
* Miscellaneous functions used by the example programs.
*/
/* nettle, low-level cryptographics library
*
* Copyright (C) 2002 Niels Möller
*
* The nettle library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or (at your
* option) any later version.
*
* The nettle library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with the nettle library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02111-1301, USA.
*/
#if HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdarg.h>
#include <stdlib.h>
/* For errno and strerror */
#include <errno.h>
#include <string.h>
#include "io.h"
#define RANDOM_DEVICE "/dev/urandom"
#define BUFSIZE 1000
int quiet_flag = 0;
void *
xalloc(size_t size)
{
void *p = malloc(size);
if (!p)
{
fprintf(stderr, "Virtual memory exhausted.\n");
abort();
}
return p;
}
void
werror(const char *format, ...)
{
if (!quiet_flag)
{
va_list args;
va_start(args, format);
vfprintf(stderr, format, args);
va_end(args);
}
}
#define MIN(a,b) (((a) < (b)) ? (a) : (b))
unsigned
read_file(const char *name, unsigned max_size, char **contents)
{
unsigned size, done;
char *buffer;
FILE *f;
f = fopen(name, "rb");
if (!f)
{
werror("Opening `%s' failed: %s\n", name, strerror(errno));
return 0;
}
size = 100;
for (buffer = NULL, done = 0;; size *= 2)
{
char *p;
if (max_size && size > max_size)
size = max_size;
/* Space for terminating NUL */
p = realloc(buffer, size + 1);
if (!p)
{
fail:
fclose(f);
free(buffer);
*contents = NULL;
return 0;
}
buffer = p;
done += fread(buffer + done, 1, size - done, f);
if (done < size)
{
/* Short count means EOF or read error */
if (ferror(f))
{
fprintf (stderr, "Reading `%s' failed: %s\n",
name, strerror(errno));
goto fail;
}
if (done == 0)
/* Treat empty file as error */
goto fail;
break;
}
if (size == max_size)
break;
}
fclose(f);
/* NUL-terminate the data. */
buffer[done] = '\0';
*contents = buffer;
return done;
}
int
write_string(FILE *f, unsigned size, const char *buffer)
{
size_t res = fwrite(buffer, 1, size, f);
return res == size;
}
int
write_file(const char *name, unsigned size, const char *buffer)
{
FILE *f = fopen(name, "wb");
int res;
if (!f)
return 0;
res = write_string(f, size, buffer);
return fclose(f) == 0 && res;
}
int
simple_random(struct yarrow256_ctx *ctx, const char *name)
{
unsigned length;
char *buffer;
if (name)
length = read_file(name, 0, &buffer);
else
length = read_file(RANDOM_DEVICE, 20, &buffer);
if (!length)
return 0;
yarrow256_seed(ctx, length, buffer);
free(buffer);
return 1;
}
int
hash_file(const struct nettle_hash *hash, void *ctx, FILE *f)
{
for (;;)
{
char buffer[BUFSIZE];
size_t res = fread(buffer, 1, sizeof(buffer), f);
if (ferror(f))
return 0;
hash->update(ctx, res, buffer);
if (feof(f))
return 1;
}
}
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