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