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