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/* sha3.c
*
* The sha3 hash function.
*/
/* nettle, low-level cryptographics library
*
* Copyright (C) 2012 Niels Möller
*
* The nettle library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or (at your
* option) any later version.
*
* The nettle library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with the nettle library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02111-1301, USA.
*/
#if HAVE_CONFIG_H
# include "config.h"
#endif
#include <assert.h>
#include <string.h>
#include "sha3.h"
#include "macros.h"
#include "memxor.h"
static void
sha3_absorb (struct sha3_state *state, unsigned length, const uint8_t *data)
{
assert ( (length & 7) == 0);
#if WORDS_BIGENDIAN
{
uint64_t *p;
for (p = state->a; length > 0; p++, length -= 8, data += 8)
*p ^= LE_READ_UINT64 (data);
}
#else /* !WORDS_BIGENDIAN */
memxor (state->a, data, length);
#endif
sha3_permute (state);
}
unsigned
_sha3_update (struct sha3_state *state,
unsigned block_size, uint8_t *block,
unsigned pos,
size_t length, const uint8_t *data)
{
if (pos > 0)
{
unsigned left = block_size - pos;
if (length < left)
{
memcpy (block + pos, data, length);
return pos + length;
}
else
{
memcpy (block + pos, data, left);
data += left;
length -= left;
sha3_absorb (state, block_size, block);
}
}
for (; length >= block_size; length -= block_size, data += block_size)
sha3_absorb (state, block_size, data);
memcpy (block, data, length);
return length;
}
void
_sha3_pad (struct sha3_state *state,
unsigned block_size, uint8_t *block, unsigned pos)
{
assert (pos < block_size);
block[pos++] = 1;
memset (block + pos, 0, block_size - pos);
block[block_size - 1] |= 0x80;
sha3_absorb (state, block_size, block);
}
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