/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/* plugins/preauth/spake/internal.h - SPAKE internal function declarations */
/*
 * Copyright (C) 2015 by the Massachusetts Institute of Technology.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * * Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * * Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in
 *   the documentation and/or other materials provided with the
 *   distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef UTIL_H
#define UTIL_H

#include "k5-int.h"
#include "groups.h"

krb5_error_code convert_to_padata(krb5_data *data, krb5_pa_data ***pa_out);

krb5_error_code update_thash(krb5_context context, groupstate *gstate,
                             int32_t group, krb5_data *thash,
                             const krb5_data *data1, const krb5_data *data2);

krb5_error_code derive_wbytes(krb5_context context, int32_t group,
                              const krb5_keyblock *ikey,
                              krb5_data *wbytes_out);

krb5_error_code derive_key(krb5_context context, groupstate *gstate,
                           int32_t group, const krb5_keyblock *ikey,
                           const krb5_data *wbytes,
                           const krb5_data *spakeresult,
                           const krb5_data *thash, const krb5_data *der_req,
                           uint32_t n, krb5_keyblock **out);

#endif /* UTIL_H */