root/crypto/krng.c

DEFINITIONS

1. krng_get_random
2. krng_reset
3. krng_mod_init
4. krng_mod_fini

/*
 * RNG implementation using standard kernel RNG.
 *
 * Copyright (c) 2008 Herbert Xu <herbert@gondor.apana.org.au>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2 of the License, or (at your
 * any later version.
 *
 */

#include <crypto/internal/rng.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/random.h>

static int krng_get_random(struct crypto_rng *tfm, u8 *rdata, unsigned int dlen)
{
        get_random_bytes(rdata, dlen);
        return 0;
}

static int krng_reset(struct crypto_rng *tfm, u8 *seed, unsigned int slen)
{
        return 0;
}

static struct crypto_alg krng_alg = {
        .cra_name               = "stdrng",
        .cra_driver_name        = "krng",
        .cra_priority           = 200,
        .cra_flags              = CRYPTO_ALG_TYPE_RNG,
        .cra_ctxsize            = 0,
        .cra_type               = &crypto_rng_type,
        .cra_module             = THIS_MODULE,
        .cra_list               = LIST_HEAD_INIT(krng_alg.cra_list),
        .cra_u                  = {
                .rng = {
                        .rng_make_random        = krng_get_random,
                        .rng_reset              = krng_reset,
                        .seedsize               = 0,
                }
        }
};


/* Module initalization */
static int __init krng_mod_init(void)
{
        return crypto_register_alg(&krng_alg);
}

static void __exit krng_mod_fini(void)
{
        crypto_unregister_alg(&krng_alg);
        return;
}

module_init(krng_mod_init);
module_exit(krng_mod_fini);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Kernel Random Number Generator");
MODULE_ALIAS("stdrng");