/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */

/* lib/crypto/krb/state.c */

/*

 * Copyright (C) 2001 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

 *

 *

 *

 *  * Section 6 (Encryption) of the Kerberos revisions document defines

 * cipher states to be used to chain encryptions and decryptions

 * together.  Examples of cipher states include initialization vectors

 * for CBC encription.    This file contains implementations of

 * krb5_c_init_state and krb5_c_free_state used by clients of the

 * Kerberos crypto library.

 */

#include "crypto_int.h"

krb5_error_code KRB5_CALLCONV

krb5_c_init_state (krb5_context context, const krb5_keyblock *key,

                   krb5_keyusage keyusage, krb5_data *new_state)

{

    const struct krb5_keytypes *ktp;

    ktp = find_enctype(key->enctype);

    if (ktp == NULL)

        return KRB5_BAD_ENCTYPE;

    return ktp->enc->init_state(key, keyusage, new_state);

}

krb5_error_code KRB5_CALLCONV

krb5_c_free_state(krb5_context context, const krb5_keyblock *key,

                  krb5_data *state)

{

    const struct krb5_keytypes *ktp;

    ktp = find_enctype(key->enctype);

    if (ktp == NULL)

        return KRB5_BAD_ENCTYPE;

    ktp->enc->free_state(state);

    return 0;

}