summaryrefslogtreecommitdiffstats
path: root/xmss_wots.h
blob: 1eebf3b215dfdc82f7b7fdd9b4b06fce603aea6d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
#ifdef WITH_XMSS
/* $OpenBSD: xmss_wots.h,v 1.3 2018/02/26 12:14:53 dtucker Exp $ */
/*
wots.h version 20160722
Andreas Hülsing
Joost Rijneveld
Public domain.
*/

#ifndef WOTS_H
#define WOTS_H

#ifdef HAVE_STDINT_H
#include "stdint.h"
#endif

/**
 * 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
#endif /* WITH_XMSS */