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MiMCSponge: makes first and last round constants always zero

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This commit is contained in:
Kobi Gurkan 2019-10-04 17:35:32 +03:00
parent 50a725c174
commit 01a5530213
1 changed files with 10 additions and 5 deletions
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15
circuits/mimcsponge.circom
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@ -39,8 +39,8 @@ template MiMCFeistel(nrounds) {
signal output xL_out; signal output xL_out;
signal output xR_out; signal output xR_out;
var c = [ // doesn't contain the first and last round constants, which are always zero
0, var c_partial = [
7120861356467848435263064379192047478074060781135320967663101236819528304084, 7120861356467848435263064379192047478074060781135320967663101236819528304084,
5024705281721889198577876690145313457398658950011302225525409148828000436681, 5024705281721889198577876690145313457398658950011302225525409148828000436681,
17980351014018068290387269214713820287804403312720763401943303895585469787384, 17980351014018068290387269214713820287804403312720763401943303895585469787384,
@ -258,8 +258,7 @@ template MiMCFeistel(nrounds) {
18224457394066545825553407391290108485121649197258948320896164404518684305122, 18224457394066545825553407391290108485121649197258948320896164404518684305122,
274945154732293792784580363548970818611304339008964723447672490026510689427, 274945154732293792784580363548970818611304339008964723447672490026510689427,
11050822248291117548220126630860474473945266276626263036056336623671308219529, 11050822248291117548220126630860474473945266276626263036056336623671308219529,
2119542016932434047340813757208803962484943912710204325088879681995922344971, 2119542016932434047340813757208803962484943912710204325088879681995922344971
0
]; ];
var t; var t;
@ -268,8 +267,14 @@ template MiMCFeistel(nrounds) {
signal xL[nrounds-1]; signal xL[nrounds-1];
signal xR[nrounds-1]; signal xR[nrounds-1];
var c;
for (var i=0; i<nrounds; i++) { for (var i=0; i<nrounds; i++) {
t = (i==0) ? k+xL_in : k + xL[i-1] + c[i]; if ((i == 0) || (i == nrounds - 1)) {
c = 0;
} else {
c = c_partial[i - 1];
}
t = (i==0) ? k+xL_in : k + xL[i-1] + c;
t2[i] <== t*t; t2[i] <== t*t;
t4[i] <== t2[i]*t2[i]; t4[i] <== t2[i]*t2[i];
if (i<nrounds-1) { if (i<nrounds-1) {