c5b916ca6f
git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@7464 ec53bebd-3082-4978-b11e-865c3cabbd6b
72 lines
2.2 KiB
C
72 lines
2.2 KiB
C
/*
|
|
* Copyright (c) 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. 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 "krb5_locl.h"
|
|
|
|
RCSID("$Id$");
|
|
|
|
static u_long table[256];
|
|
|
|
#define CRC_GEN 0xEDB88320L
|
|
|
|
void
|
|
_krb5_crc_init_table(void)
|
|
{
|
|
static int flag = 0;
|
|
unsigned long crc, poly;
|
|
int i, j;
|
|
|
|
if(flag) return;
|
|
poly = CRC_GEN;
|
|
for (i = 0; i < 256; i++) {
|
|
crc = i;
|
|
for (j = 8; j > 0; j--) {
|
|
if (crc & 1) {
|
|
crc = (crc >> 1) ^ poly;
|
|
} else {
|
|
crc >>= 1;
|
|
}
|
|
}
|
|
table[i] = crc;
|
|
}
|
|
flag = 1;
|
|
}
|
|
|
|
u_int32_t
|
|
_krb5_crc_update (char *p, size_t len, u_int32_t res)
|
|
{
|
|
while (len--)
|
|
res = table[(res ^ *p++) & 0xFF] ^ (res >> 8);
|
|
return res & 0xFFFFFFFF;
|
|
}
|