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/*
*
* ===================================
* HARP | Host ATM Research Platform
* ===================================
*
*
* This Host ATM Research Platform ("HARP") file (the "Software") is
* made available by Network Computing Services, Inc. ("NetworkCS")
* "AS IS". NetworkCS does not provide maintenance, improvements or
* support of any kind.
*
* NETWORKCS MAKES NO WARRANTIES OR REPRESENTATIONS, EXPRESS OR IMPLIED,
* INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS FOR A PARTICULAR PURPOSE, AS TO ANY ELEMENT OF THE
* SOFTWARE OR ANY SUPPORT PROVIDED IN CONNECTION WITH THIS SOFTWARE.
* In no event shall NetworkCS be responsible for any damages, including
* but not limited to consequential damages, arising from or relating to
* any use of the Software or related support.
*
* Copyright 1994-1998 Network Computing Services, Inc.
*
* Copies of this Software may be made, however, the above copyright
* notice must be reproduced on all copies.
*
* @(#) $FreeBSD$
*
*/
/*
* User Space Library Functions
* ----------------------------
*
* SCSP cache key computation
*
*/
#include <sys/types.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <net/if.h>
#include <netinet/in.h>
#include <netatm/port.h>
#include <netatm/atm.h>
#include <netatm/atm_if.h>
#include <netatm/atm_sap.h>
#include <netatm/atm_sys.h>
#include <netatm/atm_ioctl.h>
#include <md5.h>
#include <string.h>
#include "libatm.h"
#ifndef lint
__RCSID("@(#) $FreeBSD$");
#endif
/*
* Compute an SCSP cache key
*
* Arguments:
* ap pointer to an Atm_addr with the ATM address
* ip pointer to a struct in_addr with the IP address
* ol the required length of the cache key
* op pointer to receive cache key
*
* Returns:
* none
*
*/
void
scsp_cache_key(ap, ip, ol, op)
Atm_addr *ap;
struct in_addr *ip;
int ol;
char *op;
{
int i, len;
char buff[32], digest[16];
MD5_CTX context;
/*
* Initialize
*/
UM_ZERO(buff, sizeof(buff));
/*
* Copy the addresses into a buffer for MD5 computation
*/
len = sizeof(struct in_addr) + ap->address_length;
if (len > sizeof(buff))
len = sizeof(buff);
UM_COPY(ip, buff, sizeof(struct in_addr));
UM_COPY(ap->address, &buff[sizeof(struct in_addr)],
len - sizeof(struct in_addr));
/*
* Compute the MD5 digest of the combined IP and ATM addresses
*/
MD5Init(&context);
MD5Update(&context, buff, len);
MD5Final(digest, &context);
/*
* Fold the 16-byte digest to the required length
*/
UM_ZERO((caddr_t)op, ol);
for (i = 0; i < 16; i++) {
op[i % ol] = op[i % ol] ^ digest[i];
}
}
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