algif_rng.c | Explore in Territory

/*
 * algif_rng: User-space interface for random number generators
 *
 * This file provides the user-space API for random number generators.
 *
 * Copyright (C) 2014, Stephan Mueller <[email protected]>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, and the entire permission notice in its entirety,
 *    including the disclaimer of warranties.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote
 *    products derived from this software without specific prior
 *    written permission.
 *
 * ALTERNATIVELY, this product may be distributed under the terms of
 * the GNU General Public License, in which case the provisions of the GPL2
 * are required INSTEAD OF the above restrictions.  (This clause is
 * necessary due to a potential bad interaction between the GPL and
 * the restrictions contained in a BSD-style copyright.)
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ALL OF
 * WHICH ARE HEREBY DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
 * USE OF THIS SOFTWARE, EVEN IF NOT ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGE.
 */

#include <linux/capability.h>
#include <linux/module.h>
#include <crypto/rng.h>
#include <linux/random.h>
#include <crypto/if_alg.h>
#include <linux/net.h>
#include <net/sock.h>

MODULE_LICENSE(…) …;
MODULE_AUTHOR(…) …;
MODULE_DESCRIPTION(…) …;

struct rng_ctx { … };

struct rng_parent_ctx { … };

static void rng_reset_addtl(struct rng_ctx *ctx)
{ … }

static int _rng_recvmsg(struct crypto_rng *drng, struct msghdr *msg, size_t len,
			u8 *addtl, size_t addtl_len)
{ … }

static int rng_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
		       int flags)
{ … }

static int rng_test_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
			    int flags)
{ … }

static int rng_test_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
{ … }

static struct proto_ops algif_rng_ops = …;

static struct proto_ops __maybe_unused algif_rng_test_ops = …;

static void *rng_bind(const char *name, u32 type, u32 mask)
{ … }

static void rng_release(void *private)
{ … }

static void rng_sock_destruct(struct sock *sk)
{ … }

static int rng_accept_parent(void *private, struct sock *sk)
{ … }

static int rng_setkey(void *private, const u8 *seed, unsigned int seedlen)
{ … }

static int __maybe_unused rng_setentropy(void *private, sockptr_t entropy,
					 unsigned int len)
{ … }

static const struct af_alg_type algif_type_rng = …;

static int __init rng_init(void)
{ … }

static void __exit rng_exit(void)
{ … }

module_init(…) …;
module_exit(rng_exit);
linux/crypto/algif_rng.c
