kris/xmss-KAT-generator
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Check if a NEXT-tree exists before updating it

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Joost Rijneveld 2015-10-05 21:57:10 +02:00
parent 4c19fe61e4
commit 2af61cea82
1 changed files with 31 additions and 22 deletions
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13
xmss_fast.c
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@ -844,6 +844,7 @@ int xmssmt_sign(unsigned char *sk, bds_state *states, unsigned char *wots_sigs,
unsigned int n = params->n;
unsigned int m = params->m;
unsigned int tree_h = params->xmss_par.h;
unsigned int h = params->h;
unsigned int k = params->xmss_par.k;
unsigned int idx_len = params->index_len;
unsigned long long idx_tree;
@ -951,11 +952,15 @@ int xmssmt_sign(unsigned char *sk, bds_state *states, unsigned char *wots_sigs,
SET_LAYER_ADDRESS(ots_addr, 0);
SET_TREE_ADDRESS(ots_addr, (idx_tree + 1));
// mandatory update for NEXT_0 (does not count towards h-k)
bds_state_update(&states[params->d], sk_seed, &(params->xmss_par), pub_seed, ots_addr);
updates = tree_h - k;
// if a NEXT-tree exists within the hypertree
if ((1 + idx_tree) * (1 << tree_h) + idx_leaf < (1 << h)) {
// mandatory update for NEXT_0 (does not count towards h-k)
bds_state_update(&states[params->d], sk_seed, &(params->xmss_par), pub_seed, ots_addr);
// check if we're at the end of a tree
for (i = 0; i < params->d; i++) {
if (((idx + 1) & ((1 << ((i+1)*tree_h)) - 1)) == 0) {
memcpy(&tmp, states+params->d + i, sizeof(bds_state));
@ -982,6 +987,7 @@ int xmssmt_sign(unsigned char *sk, bds_state *states, unsigned char *wots_sigs,
}
}
}
}
SET_LAYER_ADDRESS(ots_addr, 0);
SET_TREE_ADDRESS(ots_addr, idx_tree);
@ -1005,10 +1011,13 @@ int xmssmt_sign(unsigned char *sk, bds_state *states, unsigned char *wots_sigs,
updates--;
}
SET_TREE_ADDRESS(ots_addr, (idx_tree + 1));
// if a NEXT-tree exists for this level;
if ((1 + idx_tree) * (1 << tree_h) + idx_leaf < (1 << (h - tree_h * i))) {
while (updates > 0 && !bds_state_update(&states[params->d + i], sk_seed, &(params->xmss_par), pub_seed, ots_addr)) {
updates--;
}
}
}
//Whipe secret elements?
//zerobytes(tsk, CRYPTO_SECRETKEYBYTES);