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/*
* lib/krb5/krb/kdc_rep_dc.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_kdc_rep_decrypt_proc()
*/
#include "k5-int.h"
/*
* Decrypt the encrypted portion of the KDC_REP message, using the key
* passed.
*
*/
/*ARGSUSED*/
krb5_error_code
krb5_kdc_rep_decrypt_proc(context, key, decryptarg, dec_rep)
krb5_context context;
const krb5_keyblock * key;
krb5_const_pointer decryptarg;
krb5_kdc_rep * dec_rep;
{
krb5_error_code retval;
krb5_encrypt_block eblock;
krb5_data scratch;
krb5_enc_kdc_rep_part *local_encpart;
if (!valid_enctype(dec_rep->enc_part.enctype))
return KRB5_PROG_ETYPE_NOSUPP;
/* set up scratch decrypt/decode area */
scratch.length = dec_rep->enc_part.ciphertext.length;
if (!(scratch.data = malloc(dec_rep->enc_part.ciphertext.length))) {
return(ENOMEM);
}
/* put together an eblock for this encryption */
krb5_use_enctype(context, &eblock, dec_rep->enc_part.enctype);
/* do any necessary key pre-processing */
if ((retval = krb5_process_key(context, &eblock, key))) {
free(scratch.data);
return(retval);
}
/* call the decryption routine */
if ((retval = krb5_decrypt(context, (krb5_pointer) dec_rep->enc_part.ciphertext.data,
(krb5_pointer) scratch.data,
scratch.length, &eblock, 0))) {
(void) krb5_finish_key(context, &eblock);
free(scratch.data);
return retval;
}
#define clean_scratch() {memset(scratch.data, 0, scratch.length); \
free(scratch.data);}
if ((retval = krb5_finish_key(context, &eblock))) {
clean_scratch();
return retval;
}
/* and do the decode */
retval = decode_krb5_enc_kdc_rep_part(&scratch, &local_encpart);
clean_scratch();
if (retval)
return retval;
dec_rep->enc_part2 = local_encpart;
return 0;
}
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