wots.h

/*
 * Copyright (c) 2022 Arm Limited
 * Copyright (c) 2022 Matthias Kannwischer
 * SPDX-License-Identifier: MIT
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 */

//
// This implementation is based on the public domain implementation of SPHINCS+
// available on https://github.com/sphincs/sphincsplus
//

#ifndef SPX_WOTS_H
#define SPX_WOTS_H

#include <stdint.h>

#include "params.h"
#include "context.h"

/**
 * Takes a WOTS signature and an n-byte message, computes a WOTS public key.
 *
 * Writes the computed public key to 'pk'.
 */
#define wots_pk_from_sig SPX_NAMESPACE(wots_pk_from_sig)
void wots_pk_from_sig(unsigned char *pk,
                      const unsigned char *sig, const unsigned char *msg,
                      const spx_ctx *ctx, uint32_t addr[8]);

/*
 * Compute the chain lengths needed for a given message hash
 */
#define chain_lengths SPX_NAMESPACE(chain_lengths)
void chain_lengths(unsigned int *lengths, const unsigned char *msg);

#endif