/*
   * 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");