/*

 * Copyright (c) 2014 Vincent Hanquez <vincent@snarc.org>

 *

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. 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.

 * 3. Neither the name of the author nor the names of his contributors

 *    may be used to endorse or promote products derived from this software

 *    without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 THE AUTHORS OR CONTRIBUTORS 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.

 */

#ifndef CRYPTONITE_SALSA

#define CRYPTONITE_SALSA

typedef union {

	uint64_t q[8];

	uint32_t d[16];

	uint8_t  b[64];

} block;

typedef block cryptonite_salsa_state;

typedef struct {

	cryptonite_salsa_state st;

	uint8_t prev[64];

	uint8_t prev_ofs;

	uint8_t prev_len;

	uint8_t nb_rounds;

} cryptonite_salsa_context;

/* for scrypt */

void cryptonite_salsa_core_xor(int rounds, block *out, block *in);

void cryptonite_salsa_init_core(cryptonite_salsa_state *st, uint32_t keylen, const uint8_t *key, uint32_t ivlen, const uint8_t *iv);

void cryptonite_salsa_init(cryptonite_salsa_context *ctx, uint8_t nb_rounds, uint32_t keylen, const uint8_t *key, uint32_t ivlen, const uint8_t *iv);

void cryptonite_salsa_combine(uint8_t *dst, cryptonite_salsa_context *st, const uint8_t *src, uint32_t bytes);

void cryptonite_salsa_generate(uint8_t *dst, cryptonite_salsa_context *st, uint32_t bytes);

#endif