a700b9bcaf
git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@1279 ec53bebd-3082-4978-b11e-865c3cabbd6b
71 lines
1.7 KiB
C
71 lines
1.7 KiB
C
#include <krb5_locl.h>
|
|
#include <krb5_error.h>
|
|
#include "crc.h"
|
|
|
|
krb5_error_code
|
|
krb5_encrypt (krb5_context context,
|
|
void *ptr,
|
|
size_t len,
|
|
krb5_keyblock *keyblock,
|
|
krb5_data *result)
|
|
{
|
|
u_char *p;
|
|
u_long crc;
|
|
size_t sz;
|
|
des_cblock key;
|
|
des_key_schedule schedule;
|
|
|
|
sz = len + 12;
|
|
sz = (sz + 7) & ~7;
|
|
p = malloc (sz);
|
|
if (p == NULL)
|
|
return ENOMEM;
|
|
memset (p, 0, sz);
|
|
des_rand_data (p, 8);
|
|
memcpy (p + 12, ptr, len);
|
|
crc_init_table ();
|
|
crc = crc_update (p, sz, 0);
|
|
p[8] = crc & 0xff;
|
|
p[9] = (crc >> 8) & 0xff;
|
|
p[10] = (crc >> 16) & 0xff;
|
|
p[11] = (crc >> 24) & 0xff;
|
|
|
|
memcpy (&key, keyblock->contents.data, sizeof(key));
|
|
des_set_key (&key, schedule);
|
|
des_cbc_encrypt ((des_cblock *)p, (des_cblock *)p, sz, schedule, &key, DES_ENCRYPT);
|
|
|
|
result->data = p;
|
|
result->length = sz;
|
|
return 0;
|
|
}
|
|
|
|
krb5_error_code
|
|
krb5_decrypt (krb5_context context,
|
|
void *ptr,
|
|
size_t len,
|
|
krb5_keyblock *keyblock,
|
|
krb5_data *result)
|
|
{
|
|
u_char *p = (u_char *)ptr;
|
|
u_long my_crc, her_crc;
|
|
des_cblock key;
|
|
des_key_schedule schedule;
|
|
|
|
memcpy (&key, keyblock->contents.data, sizeof(key));
|
|
des_set_key (&key, schedule);
|
|
des_cbc_encrypt ((des_cblock *)ptr, (des_cblock *)ptr, len, schedule, &key, DES_DECRYPT);
|
|
|
|
her_crc = (p[11] << 24) | (p[10] << 16) | (p[9] << 8) | (p[8] << 0);
|
|
memset (p + 8, 0, sizeof(her_crc));
|
|
crc_init_table ();
|
|
my_crc = crc_update (ptr, len, 0);
|
|
if (my_crc != her_crc)
|
|
return KRB5KRB_AP_ERR_BAD_INTEGRITY;
|
|
result->length = len - 12;
|
|
result->data = malloc(result->length);
|
|
if (result->data == NULL)
|
|
return ENOMEM;
|
|
memcpy (result->data, (u_char *)ptr + 12, result->length);
|
|
return 0;
|
|
}
|