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/* $OpenBSD: encdata.c,v 1.1 1997/12/18 22:28:02 art Exp $ */
/* $KTH: encdata.c,v 1.9 1997/04/01 08:17:30 joda Exp $ */
/*
* Copyright (c) 1995, 1996, 1997 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* All rights reserved.
*
* 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 above 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 software developed by the Kungliga Tekniska
* Högskolan and its contributors.
*
* 4. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``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 INSTITUTE 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.
*/
#include "kauth.h"
int
write_encrypted (int fd, void *buf, size_t len, des_key_schedule schedule,
des_cblock *session, struct sockaddr_in *me,
struct sockaddr_in *him)
{
void *outbuf;
int32_t outlen, l;
int i;
unsigned char tmp[4];
outbuf = malloc(len + 30);
if (outbuf == NULL)
return -1;
outlen = krb_mk_priv (buf, outbuf, len, schedule, session, me, him);
if (outlen < 0) {
free(outbuf);
return -1;
}
l = outlen;
for(i = 3; i >= 0; i--, l = l >> 8)
tmp[i] = l & 0xff;
if (krb_net_write (fd, tmp, 4) != 4 ||
krb_net_write (fd, outbuf, outlen) != outlen) {
free(outbuf);
outbuf = NULL;
return -1;
}
free(outbuf);
outbuf = NULL;
return 0;
}
int
read_encrypted (int fd, void *buf, size_t len, void **ret,
des_key_schedule schedule, des_cblock *session,
struct sockaddr_in *him, struct sockaddr_in *me)
{
int status;
int32_t l;
MSG_DAT msg;
unsigned char tmp[4];
l = krb_net_read (fd, tmp, 4);
if (l != 4)
return l;
l = (tmp[0] << 24) | (tmp[1] << 16) | (tmp[2] << 8) | tmp[3];
if (l > len)
return -1;
if (krb_net_read (fd, buf, l) != l)
return -1;
status = krb_rd_priv (buf, l, schedule, session, him, me, &msg);
if (status != RD_AP_OK) {
fprintf (stderr, "read_encrypted: %s\n",
krb_get_err_text(status));
return -1;
}
*ret = msg.app_data;
return msg.app_length;
}
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