120 lines
3.5 KiB
C
120 lines
3.5 KiB
C
/*-
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* Copyright (c) 2000 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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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/queue.h>
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#include <sys/libkern.h>
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#include <sys/random.h>
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#include <sys/types.h>
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#include <crypto/blowfish/blowfish.h>
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#include <dev/random/hash.h>
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/* initialise the hash by copying in some supplied data */
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void
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yarrow_hash_init(struct yarrowhash *context, void *data, size_t size)
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{
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size_t count;
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count = size > KEYSIZE ? KEYSIZE : size;
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memset(context->hash, 0xff, KEYSIZE);
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memcpy(context->hash, data, count);
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}
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/* Do a Davies-Meyer hash using a block cipher.
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* H_0 = I
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* H_i = E_M_i(H_i-1) ^ H_i-1
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*/
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void
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yarrow_hash_iterate(struct yarrowhash *context, void *data, size_t size)
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{
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u_char keybuffer[KEYSIZE], temp[KEYSIZE];
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size_t count;
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int iteration, last, i;
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iteration = 0;
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last = 0;
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for (;;) {
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if (size <= KEYSIZE)
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last = 1;
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count = size > KEYSIZE ? KEYSIZE : size;
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memcpy(keybuffer, &((u_char *)data)[iteration], count);
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memset(&keybuffer[KEYSIZE - count], 0xff, count);
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BF_set_key(&context->hashkey, count,
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&((u_char *)data)[iteration]);
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BF_cbc_encrypt(context->hash, temp, KEYSIZE, &context->hashkey,
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context->ivec, BF_ENCRYPT);
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for (i = 0; i < KEYSIZE; i++)
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context->hash[i] ^= temp[i];
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if (last)
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break;
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iteration += KEYSIZE;
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size -= KEYSIZE;
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}
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}
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/* Conclude by returning a pointer to the data */
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void
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yarrow_hash_finish(struct yarrowhash *context, void *buf)
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{
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memcpy(buf, context->hash, sizeof(context->hash));
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}
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/* Initialise the encryption routine by setting up the key schedule */
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void
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yarrow_encrypt_init(struct yarrowkey *context, void *data, size_t size)
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{
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size_t count;
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count = size > KEYSIZE ? KEYSIZE : size;
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BF_set_key(&context->key, count, 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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void
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yarrow_encrypt(struct yarrowkey *context, void *d_in, void *d_out, size_t size)
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{
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size_t count;
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int iteration, last;
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last = 0;
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for (iteration = 0;; iteration += KEYSIZE) {
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if (size <= KEYSIZE)
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last = 1;
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count = size > KEYSIZE ? KEYSIZE : size;
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BF_cbc_encrypt(&((u_char *)d_in)[iteration],
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&((u_char *)d_out)[iteration], count, &context->key,
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context->ivec, BF_ENCRYPT);
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if (last)
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break;
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size -= KEYSIZE;
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}
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}
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