circomlib/circuits/mimc.circom

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/*
Copyright 2018 0KIMS association.
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This file is part of circom (Zero Knowledge Circuit Compiler).
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circom is a free software: you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
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circom is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
License for more details.
You should have received a copy of the GNU General Public License
along with circom. If not, see <https://www.gnu.org/licenses/>.
*/
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template MiMC7(nrounds) {
signal input x_in;
signal input k;
signal output out;
var c = [
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0,
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8334177627492981984476504167502758309043212251641796197711684499645635709656,
1374324219480165500871639364801692115397519265181803854177629327624133579404,
11442588683664344394633565859260176446561886575962616332903193988751292992472,
2558901189096558760448896669327086721003508630712968559048179091037845349145,
11189978595292752354820141775598510151189959177917284797737745690127318076389,
3262966573163560839685415914157855077211340576201936620532175028036746741754,
17029914891543225301403832095880481731551830725367286980611178737703889171730,
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5040699236106090655289931820723926657076483236860546282406111821875672148900,
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11482807709115676646560379017491661435505951727793345550942389701970904563183,
8360838254132998143349158726141014535383109403565779450210746881879715734773,
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10546185249390392695582524554167530669949955276893453512788278945742408153192,
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19603444733183990109492724100282114612026332366576932662794133334264283907557,
10548274686824425401349248282213580046351514091431715597441736281987273193140,
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11867589662193422187545516240823411225342068709600734253659804646934346124945,
18718569356736340558616379408444812528964066420519677106145092918482774343613,
10530777752259630125564678480897857853807637120039176813174150229243735996839,
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12690713110714036569415168795200156516217175005650145422920562694422306200486,
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13602139229813231349386885113156901793661719180900395818909719758150455500533
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];
var t;
signal t2[nrounds];
signal t4[nrounds];
signal t6[nrounds];
signal t7[nrounds-1];
for (var i=0; i<nrounds; i++) {
t = (i==0) ? k+x_in : k + t7[i-1] + c[i];
t2[i] <== t*t;
t4[i] <== t2[i]*t2[i];
t6[i] <== t4[i]*t2[i];
if (i<nrounds-1) {
t7[i] <== t6[i]*t;
} else {
out <== t6[i]*t + k;
}
}
}
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template MultiMiMC7(nInputs, nRounds) {
signal input in[nInputs];
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signal input k;
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signal output out;
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signal r[nInputs +1];
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component mims[nInputs];
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r[0] <== k;
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for (var i=0; i<nInputs; i++) {
mims[i] = MiMC7(nRounds);
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mims[i].x_in <== in[i];
mims[i].k <== r[i];
r[i+1] <== r[i] + in[i] + mims[i].out;
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}
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out <== r[nInputs];
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}