105 lines
3.0 KiB
C
105 lines
3.0 KiB
C
/* This defines the Andrew string_to_key function. It accepts a password
|
|
* string as input and converts its via a one-way encryption algorithm to a DES
|
|
* encryption key. It is compatible with the original Andrew authentication
|
|
* service password database.
|
|
*/
|
|
|
|
#include "krb_locl.h"
|
|
|
|
RCSID("$Id: str2key.c,v 1.12.2.1 1999/08/19 13:35:01 assar Exp $");
|
|
|
|
static inline void
|
|
mklower(char *s)
|
|
{
|
|
for (; *s; s++)
|
|
if ('A' <= *s && *s <= 'Z')
|
|
*s = *s - 'A' + 'a';
|
|
}
|
|
|
|
/*
|
|
* Short passwords, i.e 8 characters or less.
|
|
*/
|
|
static inline void
|
|
afs_cmu_StringToKey(const char *str, const char *cell, des_cblock *key)
|
|
{
|
|
char password[8+1]; /* crypt is limited to 8 chars anyway */
|
|
int i;
|
|
int passlen;
|
|
|
|
memset (key, 0, sizeof(key));
|
|
memset(password, 0, sizeof(password));
|
|
|
|
strcpy_truncate (password, cell, sizeof(password));
|
|
passlen = strlen (str);
|
|
if (passlen > 8) passlen = 8;
|
|
|
|
for (i=0; i<passlen; i++)
|
|
password[i] = str[i] ^ cell[i]; /* make sure cell is zero padded */
|
|
|
|
for (i=0; i<8; i++)
|
|
if (password[i] == '\0') password[i] = 'X';
|
|
|
|
/* crypt only considers the first 8 characters of password but for some
|
|
reason returns eleven characters of result (plus the two salt chars). */
|
|
strncpy((char *)key, crypt(password, "p1") + 2, sizeof(des_cblock));
|
|
|
|
/* parity is inserted into the LSB so leftshift each byte up one bit. This
|
|
allows ascii characters with a zero MSB to retain as much significance
|
|
as possible. */
|
|
{ char *keybytes = (char *)key;
|
|
unsigned int temp;
|
|
|
|
for (i = 0; i < 8; i++) {
|
|
temp = (unsigned int) keybytes[i];
|
|
keybytes[i] = (unsigned char) (temp << 1);
|
|
}
|
|
}
|
|
des_fixup_key_parity (key);
|
|
}
|
|
|
|
/*
|
|
* Long passwords, i.e 9 characters or more.
|
|
*/
|
|
static inline void
|
|
afs_transarc_StringToKey(const char *str, const char *cell, des_cblock *key)
|
|
{
|
|
des_key_schedule schedule;
|
|
des_cblock temp_key;
|
|
des_cblock ivec;
|
|
char password[512];
|
|
int passlen;
|
|
|
|
strcpy_truncate (password, str, sizeof(password));
|
|
if ((passlen = strlen (password)) < sizeof(password)-1)
|
|
strcat_truncate (password, cell, sizeof(password));
|
|
if ((passlen = strlen(password)) > sizeof(password))
|
|
passlen = sizeof(password);
|
|
|
|
memcpy(&ivec, "kerberos", 8);
|
|
memcpy(&temp_key, "kerberos", 8);
|
|
des_fixup_key_parity (&temp_key);
|
|
des_key_sched (&temp_key, schedule);
|
|
des_cbc_cksum ((des_cblock *)password, &ivec, passlen, schedule, &ivec);
|
|
|
|
memcpy(&temp_key, &ivec, 8);
|
|
des_fixup_key_parity (&temp_key);
|
|
des_key_sched (&temp_key, schedule);
|
|
des_cbc_cksum ((des_cblock *)password, key, passlen, schedule, &ivec);
|
|
|
|
des_fixup_key_parity (key);
|
|
}
|
|
|
|
void
|
|
afs_string_to_key(const char *str, const char *cell, des_cblock *key)
|
|
{
|
|
char realm[REALM_SZ];
|
|
|
|
strcpy_truncate(realm, cell, REALM_SZ);
|
|
mklower(realm);
|
|
|
|
if (strlen(str) > 8)
|
|
afs_transarc_StringToKey (str, realm, key);
|
|
else
|
|
afs_cmu_StringToKey (str, realm, key);
|
|
}
|