67 lines
1.5 KiB
C
67 lines
1.5 KiB
C
|
/*
|
||
|
|
* 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");
|