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

/*

 * Copyright (C) 1998 by the FundsXpress, INC.

 *

 * 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 FundsXpress. not be used in advertising or publicity pertaining

 * to distribution of the software without specific, written prior

 * permission.  FundsXpress makes no representations about the suitability of

 * this software for any purpose.  It is provided "as is" without express

 * or implied warranty.

 *

 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR

 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED

 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.

 */

#include "crypto_int.h"

krb5_error_code KRB5_CALLCONV

krb5_c_make_random_key(krb5_context context, krb5_enctype enctype,

                       krb5_keyblock *random_key)

{

    krb5_error_code ret;

    const struct krb5_keytypes *ktp;

    const struct krb5_enc_provider *enc;

    size_t keybytes, keylength;

    krb5_data random_data;

    unsigned char *bytes = NULL;

    ktp = find_enctype(enctype);

    if (ktp == NULL)

        return KRB5_BAD_ENCTYPE;

    enc = ktp->enc;

    keybytes = enc->keybytes;

    keylength = enc->keylength;

    bytes = k5alloc(keybytes, &ret;;

    if (ret)

        return ret;

    random_key->contents = k5alloc(keylength, &ret;;

    if (ret)

        goto cleanup;

    random_data.data = (char *) bytes;

    random_data.length = keybytes;

    ret = krb5_c_random_make_octets(context, &random_data);

    if (ret)

        goto cleanup;

    random_key->magic = KV5M_KEYBLOCK;

    random_key->enctype = enctype;

    random_key->length = keylength;

    ret = (*ktp->rand2key)(&random_data, random_key);

cleanup:

    if (ret) {

        zapfree(random_key->contents, keylength);

        random_key->contents = NULL;

    }

    zapfree(bytes, keybytes);

    return ret;

}