pineapple-src/externals/libressl/crypto/rand/randfile.c

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2020-12-28 15:15:37 +00:00
/* $OpenBSD: randfile.c,v 1.42 2015/09/10 15:56:25 jsing Exp $ */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
* All rights reserved.
*
* This package is an SSL implementation written
* by Eric Young (eay@cryptsoft.com).
* The implementation was written so as to conform with Netscapes SSL.
*
* This library is free for commercial and non-commercial use as long as
* the following conditions are aheared to. The following conditions
* apply to all code found in this distribution, be it the RC4, RSA,
* lhash, DES, etc., code; not just the SSL code. The SSL documentation
* included with this distribution is covered by the same copyright terms
* except that the holder is Tim Hudson (tjh@cryptsoft.com).
*
* Copyright remains Eric Young's, and as such any Copyright notices in
* the code are not to be removed.
* If this package is used in a product, Eric Young should be given attribution
* as the author of the parts of the library used.
* This can be in the form of a textual message at program startup or
* in documentation (online or textual) provided with the package.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* "This product includes cryptographic software written by
* Eric Young (eay@cryptsoft.com)"
* The word 'cryptographic' can be left out if the rouines from the library
* being used are not cryptographic related :-).
* 4. If you include any Windows specific code (or a derivative thereof) from
* the apps directory (application code) you must include an acknowledgement:
* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
*
* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* The licence and distribution terms for any publically available version or
* derivative of this code cannot be changed. i.e. this code cannot simply be
* copied and put under another distribution licence
* [including the GNU Public Licence.]
*/
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <openssl/crypto.h>
#include <openssl/rand.h>
#include <openssl/buffer.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#undef BUFSIZE
#define BUFSIZE 1024
#define RAND_DATA 1024
/* Note that these functions should not be used. */
int
RAND_load_file(const char *file, long bytes)
{
/* the "whole" file */
if (bytes == -1)
return 123456;
else
return bytes;
}
int
RAND_write_file(const char *file)
{
unsigned char buf[BUFSIZE];
int i, ret = 0;
FILE *out = NULL;
int n, fd;
struct stat sb;
/*
* If this file is a device, avoid opening it.
* XXX TOCTOU
*/
if (stat(file, &sb) != -1 &&
(S_ISBLK(sb.st_mode) || S_ISCHR(sb.st_mode))) {
return (1);
}
fd = open(file, O_WRONLY|O_CREAT, 0600);
if (fd == -1)
return (1);
out = fdopen(fd, "wb");
if (out == NULL) {
close(fd);
return (1);
}
n = RAND_DATA;
for (;;) {
i = (n > BUFSIZE) ? BUFSIZE : n;
n -= BUFSIZE;
arc4random_buf(buf, i);
i = fwrite(buf, 1, i, out);
if (i <= 0) {
ret = 0;
break;
}
ret += i;
if (n <= 0)
break;
}
fclose(out);
explicit_bzero(buf, BUFSIZE);
return ret;
}
const char *
RAND_file_name(char * buf, size_t size)
{
if (strlcpy(buf, "/dev/urandom", size) >= size)
return (NULL);
return buf;
}