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/*
* 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");
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