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/*
* $Source$
* $Author$
*
* Copyright 1990 by the Massachusetts Institute of Technology.
*
* For copying and distribution information, please see the file
* <krb5/mit-copyright.h>.
*
* krb5_encrypt_tkt_part() routine.
*/
#if !defined(lint) && !defined(SABER)
static char rcsid_encrypt_tk_c[] =
"$Id$";
#endif /* !lint & !SABER */
#include <krb5/copyright.h>
#include <krb5/krb5.h>
#include <krb5/asn1.h>
#include <krb5/krb5_err.h>
#include <errno.h>
#include <krb5/ext-proto.h>
/*
Takes unencrypted dec_ticket & dec_tkt_part, encrypts with dec_ticket->etype
using *srv_key, and places result in dec_ticket->enc_part.
The string dec_ticket->enc_part will be allocated before formatting.
returns errors from encryption routines, system errors
enc_part->data allocated & filled in with encrypted stuff
*/
krb5_error_code
krb5_encrypt_tkt_part(srv_key, dec_ticket)
const krb5_keyblock *srv_key;
register krb5_ticket *dec_ticket;
{
krb5_data *scratch;
krb5_error_code retval;
krb5_encrypt_block eblock;
register krb5_enc_tkt_part *dec_tkt_part = dec_ticket->enc_part2;
/* encrypt the encrypted part */
if (!valid_etype(dec_ticket->etype))
return KRB5_PROG_ETYPE_NOSUPP;
/* 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) bzero(scratch->data, scratch->length); krb5_free_data(scratch); }
/* put together an eblock for this encryption */
eblock.crypto_entry = krb5_csarray[dec_ticket->etype]->system;
dec_ticket->enc_part.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.length))) {
/* may destroy scratch->data */
xfree(scratch);
return ENOMEM;
}
bzero(scratch->data + scratch->length,
dec_ticket->enc_part.length - scratch->length);
if (!(dec_ticket->enc_part.data = malloc(dec_ticket->enc_part.length))) {
retval = ENOMEM;
goto clean_scratch;
}
#define cleanup_encpart() {(void) bzero(dec_ticket->enc_part.data, dec_ticket->enc_part.length); free(dec_ticket->enc_part.data); dec_ticket->enc_part.length = 0; dec_ticket->enc_part.data = 0;}
/* do any necessary key pre-processing */
if (retval = (*eblock.crypto_entry->process_key)(&eblock, srv_key)) {
goto clean_encpart;
}
#define cleanup_prockey() {(void) (*eblock.crypto_entry->finish_key)(&eblock);}
/* call the encryption routine */
if (retval =
(*eblock.crypto_entry->encrypt_func)((krb5_pointer) scratch->data,
(krb5_pointer) dec_ticket->enc_part.data,
scratch->length, &eblock, 0)) {
goto clean_prockey;
}
/* ticket is now assembled-- do some cleanup */
cleanup_scratch();
if (retval = (*eblock.crypto_entry->finish_key)(&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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