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/* nettle, low-level cryptographics library
*
* Copyright (C) 2013 Nikos Mavrogiannopoulos
* Copyright (C) 2014 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 "poly1305.h"
#include "macros.h"
void
poly1305_aes_set_key (struct poly1305_aes_ctx *ctx, const uint8_t * key)
{
aes128_set_encrypt_key(&ctx->aes, (key));
poly1305_set_key(&ctx->pctx, (key+16));
ctx->index = 0;
}
void
poly1305_aes_set_nonce (struct poly1305_aes_ctx *ctx,
const uint8_t * nonce)
{
memcpy (ctx->nonce, nonce, POLY1305_AES_NONCE_SIZE);
}
#define COMPRESS(ctx, data) _poly1305_block(&(ctx)->pctx, (data), 1)
void
poly1305_aes_update (struct poly1305_aes_ctx *ctx,
size_t length, const uint8_t *data)
{
MD_UPDATE (ctx, length, data, COMPRESS, (void) 0);
}
void
poly1305_aes_digest (struct poly1305_aes_ctx *ctx,
size_t length, uint8_t *digest)
{
union nettle_block16 s;
/* final bytes */
if (ctx->index > 0)
{
assert (ctx->index < POLY1305_BLOCK_SIZE);
ctx->block[ctx->index] = 1;
memset (ctx->block + ctx->index + 1,
0, POLY1305_BLOCK_SIZE - 1 - ctx->index);
_poly1305_block (&ctx->pctx, ctx->block, 0);
}
aes128_encrypt(&ctx->aes, POLY1305_BLOCK_SIZE, s.b, ctx->nonce);
poly1305_digest (&ctx->pctx, &s);
memcpy (digest, s.b, length);
INCREMENT (16, ctx->nonce);
ctx->index = 0;
}
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