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/*
* $Source$
* $Author$
*
* Copyright 1990 by the Massachusetts Institute of Technology.
*
* For copying and distribution information, please see the file
* <krb5/copyright.h>.
*
* krb5_encode_kdc_rep() function.
*/
#if !defined(lint) && !defined(SABER)
static char rcsid_encode_kdc_c [] =
"$Id$";
#endif /* !lint & !SABER */
#include <krb5/copyright.h>
#include <krb5/krb5.h>
#include <krb5/asn1.h>
#include <krb5/ext-proto.h>
/*
Takes KDC rep parts in *rep and *encpart, and formats it into *enc_rep,
using message type type and encryption key client_key and encryption type
etype.
The string *enc_rep will be allocated before formatting; the caller should
free when finished.
returns system errors
dec_rep->enc_part is allocated and filled in.
*/
/* due to promotion rules, we need to play with this... */
krb5_error_code
krb5_encode_kdc_rep(DECLARG(const krb5_msgtype, type),
DECLARG(const register krb5_enc_kdc_rep_part *, encpart),
DECLARG(const krb5_keyblock *, client_key),
DECLARG(register krb5_kdc_rep *, dec_rep),
DECLARG(krb5_data **, enc_rep))
OLDDECLARG(const krb5_msgtype, type)
OLDDECLARG(const register krb5_enc_kdc_rep_part *, encpart)
OLDDECLARG(const krb5_keyblock *, client_key)
OLDDECLARG(register krb5_kdc_rep *, dec_rep)
OLDDECLARG(krb5_data **, enc_rep)
{
krb5_data *scratch;
krb5_encrypt_block eblock;
krb5_error_code retval;
if (!valid_etype(dec_rep->etype))
return KRB5_PROG_ETYPE_NOSUPP;
switch (type) {
case KRB5_AS_REP:
case KRB5_TGS_REP:
break;
default:
return KRB5_BADMSGTYPE;
}
if (retval = encode_krb5_enc_kdc_rep_part(encpart, &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_rep->etype]->system;
dec_rep->enc_part.length = krb5_encrypt_size(scratch->length,
eblock.crypto_entry);
/* add padding area, and zero it */
if (!(scratch->data = realloc(scratch->data, dec_rep->enc_part.length))) {
/* may destroy scratch->data */
xfree(scratch);
return ENOMEM;
}
bzero(scratch->data + scratch->length,
dec_rep->enc_part.length - scratch->length);
if (!(dec_rep->enc_part.data = malloc(dec_rep->enc_part.length))) {
retval = ENOMEM;
goto clean_scratch;
}
#define cleanup_encpart() {(void) bzero(dec_rep->enc_part.data, dec_rep->enc_part.length); free(dec_rep->enc_part.data); dec_rep->enc_part.length = 0; dec_rep->enc_part.data = 0;}
if (retval = (*eblock.crypto_entry->process_key)(&eblock, client_key)) {
goto clean_encpart;
}
#define cleanup_prockey() {(void) (*eblock.crypto_entry->finish_key)(&eblock);}
if (retval =
(*eblock.crypto_entry->encrypt_func)((krb5_pointer) scratch->data,
(krb5_pointer) dec_rep->enc_part.data,
scratch->length, &eblock, 0)) {
goto clean_prockey;
}
/* do some cleanup */
cleanup_scratch();
if (retval = (*eblock.crypto_entry->finish_key)(&eblock)) {
cleanup_encpart();
return retval;
}
/* now it's ready to be encoded for the wire! */
switch (type) {
case KRB5_AS_REP:
retval = encode_krb5_as_rep(dec_rep, enc_rep);
break;
case KRB5_TGS_REP:
retval = encode_krb5_tgs_rep(dec_rep, enc_rep);
break;
}
if (retval)
cleanup_encpart();
return retval;
clean_prockey:
cleanup_prockey();
clean_encpart:
cleanup_encpart();
clean_scratch:
cleanup_scratch();
return retval;
}
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