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/* $OpenBSD: gentcfskey.c,v 1.4 2000/06/20 07:58:56 fgsch Exp $ */
/*
* Transparent Cryptographic File System (TCFS) for NetBSD
* Author and mantainer: Luigi Catuogno [luicat@tcfs.unisa.it]
*
* references: http://tcfs.dia.unisa.it
* tcfs-bsd@tcfs.unisa.it
*/
/*
* Base utility set v0.1
*/
#include <sys/time.h>
#include <err.h>
#include <fcntl.h>
#include <md5.h>
#include <stdio.h>
#include <stdlib.h>
#include <termios.h>
#include <unistd.h>
#include <miscfs/tcfs/tcfs.h>
#include "tcfsdefines.h"
u_char *
gentcfskey(void)
{
u_char *buff;
MD5_CTX ctx, ctx2;
u_int32_t tmp[KEYSIZE];
u_char digest[16];
int i;
buff = (u_char *)calloc(KEYSIZE + 1, sizeof(char));
/* Generate random key */
for (i = 0; i < KEYSIZE; i ++)
tmp[i] = arc4random();
MD5Init(&ctx);
for (i = 0; i < KEYSIZE; i += 16) {
MD5Update(&ctx, (u_char *)tmp, sizeof(tmp));
ctx2 = ctx;
MD5Final(digest, &ctx2);
memcpy(buff + i, digest, KEYSIZE - i > 16 ? 16 : KEYSIZE - i);
}
buff[KEYSIZE] = '\0';
memset(&ctx, 0, sizeof(ctx));
return (buff);
}
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