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/***********************************************************************
*
* encrypt.c - routines to send and receive encrypted chunks using
* the krb_mk_priv and krb_rd_priv routines. A chunk
* consists of a network long "n" (the length) followed
* by "n" bytes of encrypted data.
*
* $Id: encrypt.c,v 1.2 2001/03/06 15:02:11 bbense Exp $
*
* $Log: encrypt.c,v $
* Revision 1.2 2001/03/06 15:02:11 bbense
* Ported to Solaris 2.7 and new krb5 k4 libraries.
*
* Revision 1.1 1994/06/08 17:21:41 schemers
* Initial revision
*
*
*----------------------------------------------------------------------
* Copyright (c) 1994 Board of Trustees, Leland Stanford Jr. University
***********************************************************************/
#ifndef lint
static char _rcs_id[]="$Id: encrypt.c,v 1.2 2001/03/06 15:02:11 bbense Exp $";
#endif
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <krb.h>
#include <errno.h>
#include <memory.h>
#include <stdlib.h>
#include <string.h>
#include "kftgt.h"
int
send_encrypted_chunk(
char *in,
int in_len,
int sock,
des_cblock session,
des_key_schedule sched,
struct sockaddr_in *sender,
struct sockaddr_in *receiver)
{
char buffer[KFTGT_MAX_BUFFER*2];
int elen;
KRB_UINT32 nlen;
elen = krb_mk_priv(in, buffer, in_len, sched, session, sender, receiver);
if (elen >KFTGT_MAX_BUFFER) return -1;
nlen = htonl(elen);
if (
(krb_net_write(sock,(char *)&nlen,sizeof(nlen)) != sizeof(nlen))
|| (krb_net_write(sock,buffer,elen) != elen)
) {
return -1;
}
return elen;
}
int
receive_encrypted_chunk(
MSG_DAT *m_data,
char *buffer,
int buffer_max,
int sock,
des_cblock session,
des_key_schedule sched,
struct sockaddr_in *sender,
struct sockaddr_in *receiver)
{
KRB_UINT32 nlen,elen;
int status;
if (krb_net_read(sock,(char *)&nlen, sizeof(nlen)) != sizeof(nlen)) {
return -1;
}
elen=ntohl(nlen);
if (elen> buffer_max) return -1;
if ( krb_net_read(sock, buffer, elen) != elen) return -1;
/* decrypt */
status = krb_rd_priv(buffer,elen,sched, session,sender,receiver,m_data);
if (status != KSUCCESS) return -1;
else return m_data->app_length;
}
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