[mirror_ubuntu-bionic-kernel.git] / crypto / krng.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_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");
Commit	Line	Data
17f0f4a4 NH	1	/*
	2	* RNG implementation using standard kernel RNG.
	3	*
	4	* Copyright (c) 2008 Herbert Xu <herbert@gondor.apana.org.au>
	5	*
	6	* This program is free software; you can redistribute it and/or modify it
	7	* under the terms of the GNU General Public License as published by the
	8	* Free Software Foundation; either version 2 of the License, or (at your
	9	* any later version.
	10	*
	11	*/
	12
	13	#include <crypto/internal/rng.h>
	14	#include <linux/err.h>
	15	#include <linux/init.h>
	16	#include <linux/module.h>
	17	#include <linux/random.h>
	18
	19	static int krng_get_random(struct crypto_rng tfm, u8 rdata, unsigned int dlen)
	20	{
	21	get_random_bytes(rdata, dlen);
	22	return 0;
	23	}
	24
	25	static int krng_reset(struct crypto_rng tfm, u8 seed, unsigned int slen)
	26	{
	27	return 0;
	28	}
	29
	30	static struct crypto_alg krng_alg = {
	31	.cra_name = "stdrng",
	32	.cra_driver_name = "krng",
	33	.cra_priority = 200,
	34	.cra_flags = CRYPTO_ALG_TYPE_RNG,
	35	.cra_ctxsize = 0,
	36	.cra_type = &crypto_rng_type,
	37	.cra_module = THIS_MODULE,
17f0f4a4 NH	38	.cra_u = {
	39	.rng = {
	40	.rng_make_random = krng_get_random,
	41	.rng_reset = krng_reset,
	42	.seedsize = 0,
	43	}
	44	}
	45	};
	46
	47
	48	/* Module initalization */
	49	static int __init krng_mod_init(void)
	50	{
	51	return crypto_register_alg(&krng_alg);
	52	}
	53
	54	static void __exit krng_mod_fini(void)
	55	{
	56	crypto_unregister_alg(&krng_alg);
	57	return;
	58	}
	59
	60	module_init(krng_mod_init);
	61	module_exit(krng_mod_fini);
	62
	63	MODULE_LICENSE("GPL");
	64	MODULE_DESCRIPTION("Kernel Random Number Generator");
	65	MODULE_ALIAS("stdrng");