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add explicit constraints to fee and receiver inputs

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poma 2019-08-01 22:29:40 +03:00
parent 5e6c7392de
commit f65058dad3
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1 changed files with 6 additions and 8 deletions
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circuits/withdraw.circom
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@ -51,13 +51,11 @@ template Withdraw(levels, rounds) {
tree.pathIndex[i] <== pathIndex[i]; tree.pathIndex[i] <== pathIndex[i];
} }
// Add hidden signals to make sure that tampering with receiver or fee will invalidate the snark proof // Add hidden signal to make sure that tampering with receiver or fee will invalidate the snark proof
// Most likely it is not required, but it's better to stay on the safe side and it only takes 2 constraints // Most likely it is not required, but it's better to stay on the safe side and it only takes 1 constraint
// Squares are used to prevent optimizer from removing those constraints // Multiplication is used to prevent optimizer from removing this constraint
signal receiverSquare; signal unused;
signal feeSquare; unused <== receiver * fee;
receiverSquare <== receiver * receiver;
feeSquare <== fee * fee;
} }
component main = Withdraw(16, 220); component main = Withdraw(2, 220);