1/*	$NetBSD: xmss_wots.h,v 1.2 2018/04/06 18:59:00 christos Exp $	*/
2/* $OpenBSD: xmss_wots.h,v 1.3 2018/02/26 12:14:53 dtucker Exp $ */
3/*
4wots.h version 20160722
5Andreas H��lsing
6Joost Rijneveld
7Public domain.
8*/
9
10#ifndef WOTS_H
11#define WOTS_H
12
13/**
14 * WOTS parameter set
15 *
16 * Meaning as defined in draft-irtf-cfrg-xmss-hash-based-signatures-02
17 */
18typedef struct {
19  uint32_t len_1;
20  uint32_t len_2;
21  uint32_t len;
22  uint32_t n;
23  uint32_t w;
24  uint32_t log_w;
25  uint32_t keysize;
26} wots_params;
27
28/**
29 * Set the WOTS parameters,
30 * only m, n, w are required as inputs,
31 * len, len_1, and len_2 are computed from those.
32 *
33 * Assumes w is a power of 2
34 */
35void wots_set_params(wots_params *params, int n, int w);
36
37/**
38 * 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.
39 * 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
40 *
41 * params, must have been initialized before using wots_set params for params ! This is not done in this function
42 *
43 * Places the computed public key at address pk.
44 */
45void wots_pkgen(unsigned char *pk, const unsigned char *sk, const wots_params *params, const unsigned char *pub_seed, uint32_t addr[8]);
46
47/**
48 * Takes a m-byte message and the 32-byte seed for the secret key to compute a signature that is placed at "sig".
49 *
50 */
51int 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]);
52
53/**
54 * Takes a WOTS signature, a m-byte message and computes a WOTS public key that it places at pk.
55 *
56 */
57int 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]);
58
59#endif
60