f8530155da
1) Clean up namespace; only use "Yarrow" where it is Yarrow-specific or close enough to the Yarrow algorithm. For the rest use a neutral name. 2) Tidy up headers; put private stuff in private places. More could be done here. 3) Streamline the hashing/encryption; no need for a 256-bit counter; 128 bits will last for long enough. There are bits of debug code lying around; these will be removed at a later stage.
82 lines
2.7 KiB
C
82 lines
2.7 KiB
C
/*-
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* Copyright (c) 2000-2013 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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#include <sys/param.h>
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#include <sys/systm.h>
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#include <crypto/rijndael/rijndael-api-fst.h>
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#include <crypto/sha2/sha2.h>
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#include <dev/random/hash.h>
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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, 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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* 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 KEYSIZE bytes of binary
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* data. Use CBC mode for better avalanche.
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*/
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void
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randomdev_encrypt_init(struct randomdev_key *context, void *data)
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{
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rijndael_cipherInit(&context->cipher, MODE_CBC, NULL);
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rijndael_makeKey(&context->key, DIR_ENCRYPT, KEYSIZE*8, data);
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}
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/* Encrypt the supplied data using the key schedule preset in the context.
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* <length> bytes are encrypted from <*d_in> to <*d_out>. <length> must be
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* a multiple of BLOCKSIZE.
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*/
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void
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randomdev_encrypt(struct randomdev_key *context, void *d_in, void *d_out, unsigned length)
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{
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rijndael_blockEncrypt(&context->cipher, &context->key, d_in, length*8, d_out);
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}
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