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/* poly1305-update.c
Copyright (C) 2022 Niels Möller
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 "poly1305.h"
#include "poly1305-internal.h"
#include "md-internal.h"
#if HAVE_NATIVE_fat_poly1305_blocks
const uint8_t *
_nettle_poly1305_blocks_c(struct poly1305_ctx *ctx,
size_t blocks, const uint8_t *m);
const uint8_t *
_nettle_poly1305_blocks_c(struct poly1305_ctx *ctx,
size_t blocks, const uint8_t *m)
{
for (; blocks; blocks--, m += POLY1305_BLOCK_SIZE)
_nettle_poly1305_block(ctx, m, 1);
return m;
}
#endif
unsigned
_nettle_poly1305_update (struct poly1305_ctx *ctx,
uint8_t *block, unsigned index,
size_t length, const uint8_t *m)
{
if (index > 0)
{
/* Try to fill partial block */
MD_FILL_OR_RETURN_INDEX (POLY1305_BLOCK_SIZE, block, index,
length, m);
_nettle_poly1305_block(ctx, block, 1);
}
#if HAVE_NATIVE_poly1305_blocks || HAVE_NATIVE_fat_poly1305_blocks
m = _nettle_poly1305_blocks (ctx, length >> 4, m);
length &= 15;
#else
for (; length >= POLY1305_BLOCK_SIZE;
length -= POLY1305_BLOCK_SIZE, m += POLY1305_BLOCK_SIZE)
_nettle_poly1305_block (ctx, m, 1);
#endif
memcpy (block, m, length);
return length;
}
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