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/*
* Copyright (c) 2015, Vsevolod Stakhov
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY AUTHOR ''AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL AUTHOR BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "ottery-internal.h"
#include "libcryptobox/chacha20/chacha.h"
#define STATE_LEN (sizeof(chacha_state))
#define STATE_BYTES 40
#define IDX_STEP 16
#define OUTPUT_LEN (IDX_STEP * 64)
static void
chacha20_cryptobox_state_setup (void *state_, const uint8_t *bytes)
{
chacha_state *x = state_;
chacha_init (x, (chacha_key *)bytes, (chacha_iv *)(bytes + 32), 20);
}
static void
chacha20_cryptobox_generate (void *state_, uint8_t *output, uint32_t idx)
{
chacha_state *x = state_;
memset (output, 0, OUTPUT_LEN);
memcpy (output, &idx, sizeof (idx));
chacha_update (x, output, output, OUTPUT_LEN);
}
#define PRF_CHACHA(r) { \
"CHACHA" #r "-CRYPTOBOX", \
"CHACHA" #r "-CRYPTOBOX", \
"CHACHA" #r "-CRYPTOBOX", \
STATE_LEN, \
STATE_BYTES, \
OUTPUT_LEN, \
0, \
chacha ## r ## _cryptobox_state_setup, \
chacha ## r ## _cryptobox_generate \
}
const struct ottery_prf ottery_prf_chacha20_cryptobox_ = PRF_CHACHA(20);
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