136 lines
3.8 KiB
Plaintext
136 lines
3.8 KiB
Plaintext
/*
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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
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under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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circom is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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License for more details.
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You should have received a copy of the GNU General Public License
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along with circom. If not, see <https://www.gnu.org/licenses/>.
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*/
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/*
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SMTVerifier is a component to verify inclusion/exclusion of an element in the tree
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fnc: 0 -> VERIFY INCLUSION
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1 -> VERIFY NOT INCLUSION
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*/
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include "../gates.circom";
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include "../bitify.circom";
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include "../comparators.circom";
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include "../switcher.circom";
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include "smtlevins.circom";
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include "smtverifierlevel.circom";
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include "smtverifiersm.circom";
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include "smthash.circom";
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template SMTVerifier(nLevels) {
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signal input enabled;
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signal input root;
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signal input siblings[nLevels];
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signal input oldKey;
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signal input oldValue;
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signal input isOld0;
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signal input key;
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signal input value;
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signal input fnc;
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component hash1Old = SMTHash1();
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hash1Old.key <== oldKey;
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hash1Old.value <== oldValue;
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component hash1New = SMTHash1();
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hash1New.key <== key;
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hash1New.value <== value;
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component n2bOld = Num2Bits_strict();
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component n2bNew = Num2Bits_strict();
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n2bOld.in <== oldKey;
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n2bNew.in <== key;
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component smtLevIns = SMTLevIns(nLevels);
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for (var i=0; i<nLevels; i++) smtLevIns.siblings[i] <== siblings[i];
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smtLevIns.enabled <== enabled;
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component sm[nLevels];
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for (var i=0; i<nLevels; i++) {
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sm[i] = SMTVerifierSM();
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if (i==0) {
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sm[i].prev_top <== enabled;
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sm[i].prev_i0 <== 0;
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sm[i].prev_inew <== 0;
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sm[i].prev_iold <== 0;
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sm[i].prev_na <== 1-enabled;
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} else {
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sm[i].prev_top <== sm[i-1].st_top;
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sm[i].prev_i0 <== sm[i-1].st_i0;
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sm[i].prev_inew <== sm[i-1].st_inew;
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sm[i].prev_iold <== sm[i-1].st_iold;
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sm[i].prev_na <== sm[i-1].st_na;
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}
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sm[i].is0 <== isOld0;
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sm[i].fnc <== fnc;
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sm[i].levIns <== smtLevIns.levIns[i];
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}
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sm[nLevels-1].st_na + sm[nLevels-1].st_iold + sm[nLevels-1].st_inew + sm[nLevels-1].st_i0 === 1;
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component levels[nLevels];
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for (var i=nLevels-1; i != -1; i--) {
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levels[i] = SMTVerifierLevel();
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levels[i].st_top <== sm[i].st_top;
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levels[i].st_i0 <== sm[i].st_i0;
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levels[i].st_inew <== sm[i].st_inew;
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levels[i].st_iold <== sm[i].st_iold;
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levels[i].st_na <== sm[i].st_na;
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levels[i].sibling <== siblings[i];
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levels[i].old1leaf <== hash1Old.out;
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levels[i].new1leaf <== hash1New.out;
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levels[i].lrbit <== n2bNew.out[i];
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if (i==nLevels-1) {
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levels[i].child <== 0;
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} else {
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levels[i].child <== levels[i+1].root;
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}
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}
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// Check that if checking for non inclussuin and isOld0==0 then key!=old
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component areKeyEquals = IsEqual();
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areKeyEquals.in[0] <== oldKey;
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areKeyEquals.in[1] <== key;
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component keysOk = MultiAND(4);
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keysOk.in[0] <== fnc;
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keysOk.in[1] <== 1-isOld0;
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keysOk.in[2] <== areKeyEquals.out;
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keysOk.in[3] <== enabled;
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keysOk.out === 0;
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// Check the root
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component checkRoot = ForceEqualIfEnabled();
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checkRoot.enabled <== enabled;
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checkRoot.in[0] <== levels[0].root;
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checkRoot.in[1] <== root;
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// levels[0].root === root;
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}
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