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/*
* Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the OpenSSL license (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include "apps.h"
#include <openssl/bio.h>
#include <openssl/rand.h>
static int seeded = 0;
static int egdsocket = 0;
int app_RAND_load_file(const char *file, int dont_warn)
{
int consider_randfile = (file == NULL);
char buffer[200];
if (file == NULL)
file = RAND_file_name(buffer, sizeof(buffer));
#ifndef OPENSSL_NO_EGD
else if (RAND_egd(file) > 0) {
/*
* we try if the given filename is an EGD socket. if it is, we don't
* write anything back to the file.
*/
egdsocket = 1;
return 1;
}
#endif
if (file == NULL || !RAND_load_file(file, -1)) {
if (RAND_status() == 0) {
if (!dont_warn) {
BIO_printf(bio_err, "unable to load 'random state'\n");
BIO_printf(bio_err,
"This means that the random number generator has not been seeded\n");
BIO_printf(bio_err, "with much random data.\n");
if (consider_randfile) { /* explanation does not apply when a
* file is explicitly named */
BIO_printf(bio_err,
"Consider setting the RANDFILE environment variable to point at a file that\n");
BIO_printf(bio_err,
"'random' data can be kept in (the file will be overwritten).\n");
}
}
return 0;
}
}
seeded = 1;
return 1;
}
long app_RAND_load_files(char *name)
{
char *p, *n;
int last;
long tot = 0;
#ifndef OPENSSL_NO_EGD
int egd;
#endif
for (;;) {
last = 0;
for (p = name; ((*p != '\0') && (*p != LIST_SEPARATOR_CHAR)); p++) ;
if (*p == '\0')
last = 1;
*p = '\0';
n = name;
name = p + 1;
if (*n == '\0')
break;
#ifndef OPENSSL_NO_EGD
egd = RAND_egd(n);
if (egd > 0)
tot += egd;
else
#endif
tot += RAND_load_file(n, -1);
if (last)
break;
}
if (tot > 512)
app_RAND_allow_write_file();
return (tot);
}
int app_RAND_write_file(const char *file)
{
char buffer[200];
if (egdsocket || !seeded)
/*
* If we did not manage to read the seed file, we should not write a
* low-entropy seed file back -- it would suppress a crucial warning
* the next time we want to use it.
*/
return 0;
if (file == NULL)
file = RAND_file_name(buffer, sizeof(buffer));
if (file == NULL || !RAND_write_file(file)) {
BIO_printf(bio_err, "unable to write 'random state'\n");
return 0;
}
return 1;
}
void app_RAND_allow_write_file(void)
{
seeded = 1;
}
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