/* * 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_CRYPTO("stdrng"); MODULE_ALIAS_CRYPTO("krng");