circomlib/circuits/smt/smtverifierlevel.circom
2018-12-15 09:00:35 +01:00

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/******
SMTVerifierLevel
This circuit has 1 hash
Outputs according to the state.
State root
===== =======
top H'(child, sibling)
i0 0
iold old1leaf
inew new1leaf
na 0
H' is the Hash function with the inputs shifted acordingly.
*****/
template SMTVerifierLevel() {
signal input st_top;
signal input st_i0;
signal input st_iold;
signal input st_inew;
signal input st_na;
signal output root;
signal input sibling;
signal input old1leaf;
signal input new1leaf;
signal input lrbit;
signal input child;
signal aux[2];
component proofHash = SMTHash2();
component switcher = Switcher();
switcher.L <== child;
switcher.R <== sibling;
switcher.sel <== lrbit;
proofHash.L <== switcher.outL;
proofHash.R <== switcher.outR;
aux[0] <== proofHash.out * st_top;
aux[1] <== old1leaf*st_iold;
root <== aux[0] + aux[1] + new1leaf*st_inew;
}