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/* siv-ghash-update.c
POLYVAL implementation for AES-GCM-SIV, based on GHASH
Copyright (C) 2011 Katholieke Universiteit Leuven
Copyright (C) 2011, 2013, 2018, 2022 Niels Möller
Copyright (C) 2018, 2022 Red Hat, Inc.
This file is part of GNU Nettle.
GNU Nettle is free software: you can redistribute it and/or
modify it under the terms of either:
* the GNU Lesser General Public License as published by the Free
Software Foundation; either version 3 of the License, or (at your
option) any later version.
or
* the GNU General Public License as published by the Free
Software Foundation; either version 2 of the License, or (at your
option) any later version.
or both in parallel, as here.
GNU Nettle 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
General Public License for more details.
You should have received copies of the GNU General Public License and
the GNU Lesser General Public License along with this program. If
not, see http://www.gnu.org/licenses/.
*/
#if HAVE_CONFIG_H
# include "config.h"
#endif
#include "ghash-internal.h"
#include "block-internal.h"
#include "macros.h"
const uint8_t *
_siv_ghash_update (const struct gcm_key *ctx, union nettle_block16 *state,
size_t blocks, const uint8_t *data)
{
for (; blocks-- > 0; data += GCM_BLOCK_SIZE)
{
union nettle_block16 b;
#if WORDS_BIGENDIAN
b.u64[1] = LE_READ_UINT64(data);
b.u64[0] = LE_READ_UINT64(data + 8);
#else
b.u64[1] = READ_UINT64(data);
b.u64[0] = READ_UINT64(data + 8);
#endif
_ghash_update (ctx, state, 1, b.b);
}
return data;
}
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