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/*
* lib/krb5/krb/encrypt_tk.c
*
* Copyright 1990 by the Massachusetts Institute of Technology.
* All Rights Reserved.
*
* Export of this software from the United States of America may
* require a specific license from the United States Government.
* It is the responsibility of any person or organization contemplating
* export to obtain such a license before exporting.
*
* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
* distribute this software and its documentation for any purpose and
* without fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright notice and
* this permission notice appear in supporting documentation, and that
* the name of M.I.T. not be used in advertising or publicity pertaining
* to distribution of the software without specific, written prior
* permission. M.I.T. makes no representations about the suitability of
* this software for any purpose. It is provided "as is" without express
* or implied warranty.
*
*
* krb5_encrypt_tkt_part() routine.
*/
#include "k5-int.h"
/*
Takes unencrypted dec_ticket & dec_tkt_part, encrypts with
dec_ticket->enc_part.etype
using *srv_key, and places result in dec_ticket->enc_part.
The string dec_ticket->enc_part.ciphertext will be allocated before
formatting.
returns errors from encryption routines, system errors
enc_part->ciphertext.data allocated & filled in with encrypted stuff
*/
krb5_error_code
krb5_encrypt_tkt_part(context, srv_key, dec_ticket)
krb5_context context;
const krb5_keyblock *srv_key;
register krb5_ticket *dec_ticket;
{
krb5_encrypt_block eblock;
krb5_data *scratch;
krb5_error_code retval;
register krb5_enc_tkt_part *dec_tkt_part = dec_ticket->enc_part2;
/* start by encoding the to-be-encrypted part. */
if ((retval = encode_krb5_enc_tkt_part(dec_tkt_part, &scratch))) {
return retval;
}
#define cleanup_scratch() { (void) memset(scratch->data, 0, scratch->length); \
krb5_free_data(context, scratch); }
krb5_use_enctype(context, &eblock, srv_key->enctype);
dec_ticket->enc_part.ciphertext.length =
krb5_encrypt_size(scratch->length, eblock.crypto_entry);
/* add padding area, and zero it */
if (!(scratch->data = realloc(scratch->data,
dec_ticket->enc_part.ciphertext.length))) {
/* may destroy scratch->data */
krb5_xfree(scratch);
return ENOMEM;
}
memset(scratch->data + scratch->length, 0,
dec_ticket->enc_part.ciphertext.length - scratch->length);
if (!(dec_ticket->enc_part.ciphertext.data =
malloc(dec_ticket->enc_part.ciphertext.length))) {
retval = ENOMEM;
goto clean_scratch;
}
#define cleanup_encpart() {\
(void) memset(dec_ticket->enc_part.ciphertext.data, 0,\
dec_ticket->enc_part.ciphertext.length); \
free(dec_ticket->enc_part.ciphertext.data); \
dec_ticket->enc_part.ciphertext.length = 0; \
dec_ticket->enc_part.ciphertext.data = 0;}
/* do any necessary key pre-processing */
if ((retval = krb5_process_key(context, &eblock, srv_key))) {
goto clean_encpart;
}
#define cleanup_prockey() {(void) krb5_finish_key(context, &eblock);}
/* call the encryption routine */
if ((retval = krb5_encrypt(context, (krb5_pointer) scratch->data,
(krb5_pointer) dec_ticket->enc_part.ciphertext.data,
scratch->length, &eblock, 0))) {
goto clean_prockey;
}
dec_ticket->enc_part.enctype = srv_key->enctype;
/* ticket is now assembled-- do some cleanup */
cleanup_scratch();
if ((retval = krb5_finish_key(context, &eblock))) {
cleanup_encpart();
return retval;
}
return 0;
clean_prockey:
cleanup_prockey();
clean_encpart:
cleanup_encpart();
clean_scratch:
cleanup_scratch();
return retval;
}
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