58 rivejä
1.7 KiB
C
58 rivejä
1.7 KiB
C
/*
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wots.h version 20151120
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Andreas Hülsing
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Public domain.
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*/
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#ifndef WOTS_H
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#define WOTS_H
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/**
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* WOTS parameter set
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*
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* Meaning as defined in draft-irtf-cfrg-xmss-hash-based-signatures-02
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*/
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typedef struct{
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int len_1;
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int len_2;
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int len;
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int m;
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int n;
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int w;
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int log_w;
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int keysize;
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} wots_params;
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/**
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* Set the WOTS parameters,
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* only m, n, w are required as inputs,
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* len, len_1, and len_2 are computed from those.
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*
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* Assumes w is a power of 2
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*/
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void wots_set_params(wots_params *params, int m, int n, int w);
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/**
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* 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.
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* 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
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*
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* params, must have been initialized before using wots_set params for params ! This is not done in this function
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*
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* Places the computed public key at address pk.
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*/
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void wots_pkgen(unsigned char *pk, const unsigned char *sk, const wots_params *params, const unsigned char *pub_seed, unsigned char addr[16]);
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/**
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* Takes a m-byte message and the 32-byte seed for the secret key to compute a signature that is placed at "sig".
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*
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*/
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void wots_sign(unsigned char *sig, const unsigned char *msg, const unsigned char *sk, const wots_params *params, const unsigned char *pub_seed, unsigned char addr[16]);
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/**
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* Takes a WOTS signature, a m-byte message and computes a WOTS public key that it places at pk.
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*
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*/
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void wots_pkFromSig(unsigned char *pk, const unsigned char *sig, const unsigned char *msg, const wots_params *params, const unsigned char *pub_seed, unsigned char addr[16]);
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#endif
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