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 /* 4 wots.h version 20160722 5 Andreas Hülsing 6 Joost Rijneveld 7 Public 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 */ 18 typedef 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 */ 35 void 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 */ 45 void 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 */ 51 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]); 52 53 /** 54 * Takes a WOTS signature, a m-byte message and computes a WOTS public key that it places at pk. 55 * 56 */ 57 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]); 58 59 #endif 60