1 #ifdef WITH_XMSS 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 #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 */ 22 typedef 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 */ 39 void 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 */ 49 void 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 */ 55 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]); 56 57 /** 58 * Takes a WOTS signature, a m-byte message and computes a WOTS public key that it places at pk. 59 * 60 */ 61 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]); 62 63 #endif 64 #endif /* WITH_XMSS */ 65