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94 lines
2.6 KiB
94 lines
2.6 KiB
/*
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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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SMTProcessorLevel
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This circuit has 2 hash
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Outputs according to the state.
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State oldRoot newRoot
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===== ======= =======
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top H'(oldChild, sibling) H'(newChild, sibling)
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old0 0 new1leaf
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bot old1leaf H'(newChild, 0)
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new1 old1leaf H'(new1leaf, old1leaf)
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na 0 0
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upd old1leaf new1leaf
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H' is the Hash function with the inputs shifted acordingly.
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*****/
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template SMTProcessorLevel() {
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signal input st_top;
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signal input st_old0;
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signal input st_bot;
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signal input st_new1;
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signal input st_na;
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signal input st_upd;
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signal output oldRoot;
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signal output newRoot;
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signal input sibling;
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signal input old1leaf;
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signal input new1leaf;
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signal input newlrbit;
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signal input oldChild;
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signal input newChild;
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signal aux[4];
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component oldProofHash = SMTHash2();
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component newProofHash = SMTHash2();
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component oldSwitcher = Switcher();
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component newSwitcher = Switcher();
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// Old side
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oldSwitcher.L <== oldChild;
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oldSwitcher.R <== sibling;
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oldSwitcher.sel <== newlrbit;
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oldProofHash.L <== oldSwitcher.outL;
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oldProofHash.R <== oldSwitcher.outR;
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aux[0] <== old1leaf * (st_bot + st_new1 + st_upd);
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oldRoot <== aux[0] + oldProofHash.out * st_top;
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// New side
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aux[1] <== newChild * ( st_top + st_bot);
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newSwitcher.L <== aux[1] + new1leaf*st_new1;
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aux[2] <== sibling*st_top;
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newSwitcher.R <== aux[2] + old1leaf*st_new1;
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newSwitcher.sel <== newlrbit;
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newProofHash.L <== newSwitcher.outL;
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newProofHash.R <== newSwitcher.outR;
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aux[3] <== newProofHash.out * (st_top + st_bot + st_new1);
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newRoot <== aux[3] + new1leaf * (st_old0 + st_upd);
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}
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