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

/* lib/crypto/krb/prng_os.c - OS PRNG implementation */

/*

 * Copyright (C) 2016 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.

 */

/*

 * This file implements a PRNG module which relies on the system's PRNG.  An

 * OS packager can select this module given sufficient confidence in the

 * operating system's native PRNG quality.

 */

#include "crypto_int.h"

int

k5_prng_init(void)

{

    return 0;

}

void

k5_prng_cleanup(void)

{

}

krb5_error_code KRB5_CALLCONV

krb5_c_random_add_entropy(krb5_context context, unsigned int randsource,

                          const krb5_data *indata)

{

    return 0;

}

krb5_error_code KRB5_CALLCONV

krb5_c_random_make_octets(krb5_context context, krb5_data *outdata)

{

    krb5_boolean res;

    res = k5_get_os_entropy((uint8_t *)outdata->data, outdata->length, 0);

    return res ? 0 : KRB5_CRYPTO_INTERNAL;

}

krb5_error_code KRB5_CALLCONV

krb5_c_random_os_entropy(krb5_context context, int strong, int *success)

{

    return 0;

}