109 lines
2.6 KiB
C
109 lines
2.6 KiB
C
/*
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**
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** OpenBSD emulation routines
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**
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** Damien Miller <djm@ibs.com.au>
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**
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** Copyright 1999 Internet Business Solutions
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**
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** Permission is hereby granted, free of charge, to any person
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** obtaining a copy of this software and associated documentation
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** files (the "Software"), to deal in the Software without
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** restriction, including without limitation the rights to use, copy,
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** modify, merge, publish, distribute, sublicense, and/or sell copies
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** of the Software, and to permit persons to whom the Software is
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** furnished to do so, subject to the following conditions:
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**
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** The above copyright notice and this permission notice shall be
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** included in all copies or substantial portions of the Software.
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**
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** THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
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** KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
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** WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
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** AND NONINFRINGEMENT. IN NO EVENT SHALL DAMIEN MILLER OR INTERNET
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** BUSINESS SOLUTIONS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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** LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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** ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE
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** OR OTHER DEALINGS IN THE SOFTWARE.
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**
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** Except as contained in this notice, the name of Internet Business
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** Solutions shall not be used in advertising or otherwise to promote
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** the sale, use or other dealings in this Software without prior
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** written authorization from Internet Business Solutions.
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**
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <unistd.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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#include "rc4.h"
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#include "xmalloc.h"
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#include "helper.h"
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void get_random_bytes(unsigned char *buf, int len);
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static rc4_t *rc4 = NULL;
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void setproctitle(const char *fmt, ...)
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{
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/* FIXME */
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}
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unsigned char arc4random(void)
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{
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unsigned char r;
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if (rc4 == NULL)
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arc4random_stir();
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rc4_getbytes(rc4, &r, 1);
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return(r);
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}
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void arc4random_stir(void)
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{
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unsigned char rand_buf[32];
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if (rc4 == NULL)
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rc4 = xmalloc(sizeof(*rc4));
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get_random_bytes(rand_buf, sizeof(rand_buf));
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rc4_key(rc4, rand_buf, sizeof(rand_buf));
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}
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void get_random_bytes(unsigned char *buf, int len)
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{
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int urandom;
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int c;
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urandom = open("/dev/urandom", O_RDONLY);
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if (urandom == -1)
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{
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fprintf(stderr, "Couldn't open /dev/urandom: %s", strerror(errno));
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exit(1);
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}
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c = read(urandom, buf, len);
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if (c == -1)
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{
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fprintf(stderr, "Couldn't read from /dev/urandom: %s", strerror(errno));
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exit(1);
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}
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if (c != len)
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{
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fprintf(stderr, "Short read from /dev/urandom");
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exit(1);
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}
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}
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