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51c68d18e2
As a step towards adding other potential streaming ciphers. As well as just pushing the loop down into the rijndael APIs (basically 128-bit wide AES-ICM mode) to eliminate some excess explicit_bzero(). No functional change intended. Reviewed by: delphij, markm Approved by: secteam (delphij) Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D19411
113 lines
3.4 KiB
C
113 lines
3.4 KiB
C
/*-
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* Copyright (c) 2000-2015 Mark R V Murray
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer
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* in this position and unchanged.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#ifdef _KERNEL
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#include <sys/param.h>
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#include <sys/systm.h>
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#else /* !_KERNEL */
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#include <sys/param.h>
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#include <sys/types.h>
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#include <inttypes.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <threads.h>
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#include "unit_test.h"
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#endif /* _KERNEL */
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#include <crypto/rijndael/rijndael-api-fst.h>
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#include <crypto/sha2/sha256.h>
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#include <dev/random/hash.h>
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/* This code presumes that RANDOM_KEYSIZE is twice as large as RANDOM_BLOCKSIZE */
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CTASSERT(RANDOM_KEYSIZE == 2*RANDOM_BLOCKSIZE);
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/* Initialise the hash */
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void
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randomdev_hash_init(struct randomdev_hash *context)
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{
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SHA256_Init(&context->sha);
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}
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/* Iterate the hash */
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void
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randomdev_hash_iterate(struct randomdev_hash *context, const void *data, size_t size)
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{
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SHA256_Update(&context->sha, data, size);
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}
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/* Conclude by returning the hash in the supplied <*buf> which must be
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* RANDOM_KEYSIZE bytes long.
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*/
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void
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randomdev_hash_finish(struct randomdev_hash *context, void *buf)
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{
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SHA256_Final(buf, &context->sha);
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}
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/* Initialise the encryption routine by setting up the key schedule
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* from the supplied <*data> which must be RANDOM_KEYSIZE bytes of binary
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* data.
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*/
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void
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randomdev_encrypt_init(struct randomdev_key *context, const void *data)
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{
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rijndael_cipherInit(&context->cipher, MODE_ECB, NULL);
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rijndael_makeKey(&context->key, DIR_ENCRYPT, RANDOM_KEYSIZE*8, data);
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}
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/*
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* Create a psuedorandom output stream of 'blockcount' blocks using a CTR-mode
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* cipher or similar. The 128-bit counter is supplied in the in-out parmeter
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* 'ctr.' The output stream goes to 'd_out.' 'blockcount' RANDOM_BLOCKSIZE
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* bytes are generated.
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*/
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void
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randomdev_keystream(struct randomdev_key *context, uint128_t *ctr,
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void *d_out, u_int blockcount)
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{
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u_int i;
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for (i = 0; i < blockcount; i++) {
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/*-
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* FS&K - r = r|E(K,C)
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* - C = C + 1
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*/
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rijndael_blockEncrypt(&context->cipher, &context->key,
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(void *)ctr, RANDOM_BLOCKSIZE * 8, d_out);
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d_out = (char *)d_out + RANDOM_BLOCKSIZE;
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uint128_increment(ctr);
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}
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}
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