/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/* 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.  Furthermore if you modify this software you must label
 * your software as modified software and not distribute it in such a
 * fashion that it might be confused with the original M.I.T. software.
 * 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.
 */

#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(krb5_context context, const krb5_keyblock *key, krb5_const_pointer decryptarg, krb5_kdc_rep *dec_rep)
{
    krb5_error_code retval;
    krb5_data scratch;
    krb5_enc_kdc_rep_part *local_encpart;
    krb5_keyusage usage;

    if (decryptarg) {
        usage = *(const krb5_keyusage *) decryptarg;
    } else {
        usage = KRB5_KEYUSAGE_AS_REP_ENCPART;
    }

    /* 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);
    }

    /*dec_rep->enc_part.enctype;*/

    if ((retval = krb5_c_decrypt(context, key, usage, 0, &dec_rep->enc_part,
                                 &scratch))) {
        free(scratch.data);
        return(retval);
    }

#define clean_scratch() {memset(scratch.data, 0, scratch.length);       \
        free(scratch.data);}

    /* 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;
}