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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_decrypt_tkt_part() function.
*/
#if !defined(lint) && !defined(SABER)
static char rcsid_decrypt_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>
/* array of pointers into encryption systems */
extern krb5_cs_table_entry *csarray[];
extern int max_cryptosystem;
/*
Takes encrypted dec_ticket->enc_part, encrypts with dec_ticket->etype
using *srv_key, and places result in dec_ticket->enc_part2.
The storage of dec_ticket->enc_part2 will be allocated before return.
returns errors from encryption routines, system errors
*/
krb5_error_code
krb5_decrypt_tkt_part(srv_key, ticket)
krb5_keyblock *srv_key;
register krb5_ticket *ticket;
{
krb5_enc_tkt_part *dec_tkt_part;
krb5_encrypt_block eblock;
krb5_data scratch;
krb5_error_code retval;
if (ticket->etype > max_cryptosystem ||
ticket->etype < 0 ||
!csarray[ticket->etype])
return KRB5KDC_ERR_ETYPE_NOSUPP;
/* put together an eblock for this encryption */
eblock.crypto_entry = csarray[ticket->etype]->system;
scratch.length = ticket->enc_part.length;
if (!(scratch.data = malloc(ticket->enc_part.length)))
return(ENOMEM);
/* do any necessary key pre-processing */
if (retval = (*eblock.crypto_entry->process_key)(&eblock, srv_key)) {
free(scratch.data);
return(retval);
}
/* call the encryption routine */
if (retval =
(*eblock.crypto_entry->decrypt_func)((krb5_pointer) ticket->enc_part.data,
(krb5_pointer) scratch.data,
scratch.length, &eblock)) {
(void) (*eblock.crypto_entry->finish_key)(&eblock);
free(scratch.data);
return retval;
}
#define clean_scratch() {bzero(scratch.data, scratch.length); free(scratch.data);}
if (retval = (*eblock.crypto_entry->finish_key)(&eblock)) {
clean_scratch();
return retval;
}
/* now decode the decrypted stuff */
if (!(retval = decode_krb5_enc_tkt_part(&scratch, &dec_tkt_part))) {
ticket->enc_part2 = dec_tkt_part;
}
clean_scratch();
return retval;
}
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