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/* $OpenBSD: xmss_wots.h,v 1.2 2018/02/26 03:56:44 dtucker Exp $ */
/*
wots.h version 20160722
Andreas Hülsing
Joost Rijneveld
Public domain.
*/
#ifndef WOTS_H
#define WOTS_H
#include "stdint.h"
/**
* WOTS parameter set
*
* Meaning as defined in draft-irtf-cfrg-xmss-hash-based-signatures-02
*/
typedef struct {
uint32_t len_1;
uint32_t len_2;
uint32_t len;
uint32_t n;
uint32_t w;
uint32_t log_w;
uint32_t keysize;
} wots_params;
/**
* Set the WOTS parameters,
* only m, n, w are required as inputs,
* len, len_1, and len_2 are computed from those.
*
* Assumes w is a power of 2
*/
void wots_set_params(wots_params *params, int n, int w);
/**
* WOTS key generation. Takes a 32byte seed for the secret key, expands it to a full WOTS secret key and computes the corresponding public key.
* For this it takes the seed pub_seed which is used to generate bitmasks and hash keys and the address of this WOTS key pair addr
*
* params, must have been initialized before using wots_set params for params ! This is not done in this function
*
* Places the computed public key at address pk.
*/
void wots_pkgen(unsigned char *pk, const unsigned char *sk, const wots_params *params, const unsigned char *pub_seed, uint32_t addr[8]);
/**
* Takes a m-byte message and the 32-byte seed for the secret key to compute a signature that is placed at "sig".
*
*/
int wots_sign(unsigned char *sig, const unsigned char *msg, const unsigned char *sk, const wots_params *params, const unsigned char *pub_seed, uint32_t addr[8]);
/**
* Takes a WOTS signature, a m-byte message and computes a WOTS public key that it places at pk.
*
*/
int wots_pkFromSig(unsigned char *pk, const unsigned char *sig, const unsigned char *msg, const wots_params *params, const unsigned char *pub_seed, uint32_t addr[8]);
#endif
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