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/*
* Copyright (c) 1999 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 "krb_locl.h"
RCSID("$Id: str2key.c,v 1.17 1999/12/02 16:58:44 joda Exp $");
#define lowcase(c) (('A' <= (c) && (c) <= 'Z') ? ((c) - 'A' + 'a') : (c))
/*
* The string to key function used by Transarc AFS.
*/
void
afs_string_to_key(const char *pass, const char *cell, des_cblock *key)
{
if (strlen(pass) <= 8) /* Short passwords. */
{
char buf[8 + 1], *s;
int i;
/*
* XOR cell and password and pad (or fill) with 'X' to length 8,
* then use crypt(3) to create DES key.
*/
for (i = 0; i < 8; i++)
{
buf[i] = *pass ^ lowcase(*cell);
if (buf[i] == 0)
buf[i] = 'X';
if (*pass != 0)
pass++;
if (*cell != 0)
cell++;
}
buf[8] = 0;
s = crypt(buf, "p1"); /* Result from crypt is 7bit chars. */
s = s + 2; /* Skip 2 chars of salt. */
for (i = 0; i < 8; i++)
((char *) key)[i] = s[i] << 1; /* High bit is always zero */
des_fixup_key_parity(key); /* Low bit is parity */
}
else /* Long passwords */
{
int plen, clen;
char *buf, *t;
des_key_schedule sched;
des_cblock ivec;
/*
* Concatenate password with cell name,
* then checksum twice to create DES key.
*/
plen = strlen(pass);
clen = strlen(cell);
buf = malloc(plen + clen + 1);
memcpy(buf, pass, plen);
for (t = buf + plen; *cell != 0; t++, cell++)
*t = lowcase(*cell);
memcpy(&ivec, "kerberos", 8);
memcpy(key, "kdsbdsns", 8);
des_key_sched(key, sched);
/* Beware, ivec is passed twice */
des_cbc_cksum((des_cblock *)buf, &ivec, plen + clen, sched, &ivec);
memcpy(key, &ivec, 8);
des_fixup_key_parity(key);
des_key_sched(key, sched);
/* Beware, ivec is passed twice */
des_cbc_cksum((des_cblock *)buf, key, plen + clen, sched, &ivec);
free(buf);
des_fixup_key_parity(key);
}
}
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