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1#ifdef WITH_XMSS
2/* $OpenBSD: xmss_wots.h,v 1.3 2018/02/26 12:14:53 dtucker Exp $ */
3/*
4wots.h version 20160722
5Andreas Hülsing
6Joost Rijneveld
7Public domain.
8*/
9
10#ifndef WOTS_H
11#define WOTS_H
12
13#ifdef HAVE_STDINT_H
14#include "stdint.h"
15#endif
16
17/**
18 * WOTS parameter set
19 *
20 * Meaning as defined in draft-irtf-cfrg-xmss-hash-based-signatures-02
21 */
22typedef struct {
23 uint32_t len_1;
24 uint32_t len_2;
25 uint32_t len;
26 uint32_t n;
27 uint32_t w;
28 uint32_t log_w;
29 uint32_t keysize;
30} wots_params;
31
32/**
33 * Set the WOTS parameters,
34 * only m, n, w are required as inputs,
35 * len, len_1, and len_2 are computed from those.
36 *
37 * Assumes w is a power of 2
38 */
39void wots_set_params(wots_params *params, int n, int w);
40
41/**
42 * 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.
43 * 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
44 *
45 * params, must have been initialized before using wots_set params for params ! This is not done in this function
46 *
47 * Places the computed public key at address pk.
48 */
49void wots_pkgen(unsigned char *pk, const unsigned char *sk, const wots_params *params, const unsigned char *pub_seed, uint32_t addr[8]);
50
51/**
52 * Takes a m-byte message and the 32-byte seed for the secret key to compute a signature that is placed at "sig".
53 *
54 */
55int 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]);
56
57/**
58 * Takes a WOTS signature, a m-byte message and computes a WOTS public key that it places at pk.
59 *
60 */
61int 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]);
62
63#endif
64#endif /* WITH_XMSS */