147 lines
4.6 KiB
C
147 lines
4.6 KiB
C
/* $OpenBSD: randfile.c,v 1.45 2024/04/10 14:53:01 beck Exp $ */
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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* All rights reserved.
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*
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* This package is an SSL implementation written
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* by Eric Young (eay@cryptsoft.com).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson (tjh@cryptsoft.com).
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* "This product includes cryptographic software written by
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* Eric Young (eay@cryptsoft.com)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.]
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*/
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <openssl/crypto.h>
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#include <openssl/rand.h>
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#include <openssl/buffer.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#undef BUFSIZE
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#define BUFSIZE 1024
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#define RAND_DATA 1024
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/* Note that these functions should not be used. */
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int
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RAND_load_file(const char *file, long bytes)
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{
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/* the "whole" file */
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if (bytes == -1)
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return 123456;
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else
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return bytes;
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}
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LCRYPTO_ALIAS(RAND_load_file);
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int
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RAND_write_file(const char *file)
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{
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unsigned char buf[BUFSIZE];
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int i, ret = 0;
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FILE *out = NULL;
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int n, fd;
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struct stat sb;
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/*
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* If this file is a device, avoid opening it.
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* XXX TOCTOU
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*/
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if (stat(file, &sb) != -1 &&
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(S_ISBLK(sb.st_mode) || S_ISCHR(sb.st_mode))) {
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return (1);
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}
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fd = open(file, O_WRONLY|O_CREAT, 0600);
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if (fd == -1)
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return (1);
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out = fdopen(fd, "wb");
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if (out == NULL) {
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close(fd);
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return (1);
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}
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n = RAND_DATA;
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for (;;) {
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i = (n > BUFSIZE) ? BUFSIZE : n;
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n -= BUFSIZE;
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arc4random_buf(buf, i);
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i = fwrite(buf, 1, i, out);
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if (i <= 0) {
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ret = 0;
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break;
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}
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ret += i;
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if (n <= 0)
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break;
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}
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fclose(out);
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explicit_bzero(buf, BUFSIZE);
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return ret;
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}
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LCRYPTO_ALIAS(RAND_write_file);
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const char *
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RAND_file_name(char * buf, size_t size)
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{
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if (strlcpy(buf, "/dev/urandom", size) >= size)
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return (NULL);
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return buf;
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}
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LCRYPTO_ALIAS(RAND_file_name);
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