9f509a92e5
o Each source gets its own queue, which is a FIFO, not a ring buffer.
The FIFOs are implemented with the sys/queue.h macros. The separation
is so that a low entropy/high rate source can't swamp the harvester
with low-grade entropy and destroy the reseeds.
o Each FIFO is limited to 256 (set as a macro, so adjustable) events
queueable. Full FIFOs are ignored by the harvester. This is to
prevent memory wastage, and helps to keep the kernel thread CPU
usage within reasonable limits.
o There is no need to break up the event harvesting into ${burst}
sized chunks, so retire that feature.
o Break the device away from its roots with the memory device, and
allow it to get its major number automagically.
82 lines
2.6 KiB
C
82 lines
2.6 KiB
C
/*-
|
|
* Copyright (c) 2000, 2001, 2002, 2003 Mark R V Murray
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer
|
|
* in this position and unchanged.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
|
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
|
|
#include <crypto/rijndael/rijndael.h>
|
|
#include <crypto/sha2/sha2.h>
|
|
|
|
#include <dev/random/hash.h>
|
|
|
|
/* initialise the hash */
|
|
void
|
|
yarrow_hash_init(struct yarrowhash *context)
|
|
{
|
|
SHA256_Init(&context->sha);
|
|
}
|
|
|
|
/* iterate the hash */
|
|
void
|
|
yarrow_hash_iterate(struct yarrowhash *context, void *data, size_t size)
|
|
{
|
|
SHA256_Update(&context->sha, data, size);
|
|
}
|
|
|
|
/* Conclude by returning the hash in the supplied /buf/ which must be
|
|
* KEYSIZE bytes long.
|
|
*/
|
|
void
|
|
yarrow_hash_finish(struct yarrowhash *context, void *buf)
|
|
{
|
|
SHA256_Final(buf, &context->sha);
|
|
}
|
|
|
|
/* Initialise the encryption routine by setting up the key schedule
|
|
* from the supplied /data/ which must be KEYSIZE bytes of binary
|
|
* data.
|
|
*/
|
|
void
|
|
yarrow_encrypt_init(struct yarrowkey *context, void *data)
|
|
{
|
|
rijndael_cipherInit(&context->cipher, MODE_CBC, NULL);
|
|
rijndael_makeKey(&context->key, DIR_ENCRYPT, KEYSIZE*8, data);
|
|
}
|
|
|
|
/* Encrypt the supplied data using the key schedule preset in the context.
|
|
* KEYSIZE bytes are encrypted from /d_in/ to /d_out/.
|
|
*/
|
|
void
|
|
yarrow_encrypt(struct yarrowkey *context, void *d_in, void *d_out)
|
|
{
|
|
rijndael_blockEncrypt(&context->cipher, &context->key, d_in,
|
|
KEYSIZE*8, d_out);
|
|
}
|