a_md5decrypt.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
* Copyright (c) 1996 by Sun Microsystems, Inc.
* All Rights Reserved.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
/*
* md5crypt - MD5 based authentication routines
*/
#include "ntp_types.h"
#include "ntp_string.h"
#include <md5.h>
#include "ntp_stdlib.h"
extern u_int32 cache_keyid;
extern char *cache_key;
extern int cache_keylen;
/*
* Stat counters, imported from data base module
*/
extern u_int32 authencryptions;
extern u_int32 authdecryptions;
extern u_int32 authkeyuncached;
/*
* For our purposes an NTP packet looks like:
*
* a variable amount of encrypted data, multiple of 8 bytes, followed by:
* NOCRYPT_OCTETS worth of unencrypted data, followed by:
* BLOCK_OCTETS worth of ciphered checksum.
*/
#define NOCRYPT_OCTETS 4
#define BLOCK_OCTETS 16
int
int length; /* length of variable data in octets */
{
#if defined(__NetBSD__) || defined(SYS_SOLARIS)
unsigned char hash[16];
#endif
if (keyno != cache_keyid) {
if (!authhavekey(keyno))
return 0;
}
#if defined(__NetBSD__) || defined(SYS_SOLARIS)
#else
#endif
return (!memcmp(
#if defined(__NetBSD__) || defined(SYS_SOLARIS)
(const char *) hash,
#else
#endif
BLOCK_OCTETS));
}