105 lines
No EOL
3.5 KiB
Text
105 lines
No EOL
3.5 KiB
Text
pragma circom 2.0.0;
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include "../node_modules/circomlib/circuits/poseidon.circom";
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include "../node_modules/circomlib/circuits/comparators.circom";
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include "../node_modules/circomlib/circuits/switcher.circom";
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include "../node_modules/circomlib/circuits/bitify.circom";
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// Merkle tree inclusion proof verifier
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template MerkleTreeChecker(levels) {
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signal input leaf;
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signal input root;
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signal input pathElements[levels];
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signal input pathIndices[levels];
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component selectors[levels];
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component hashers[levels];
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signal computedPath[levels + 1];
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computedPath[0] <== leaf;
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for (var i = 0; i < levels; i++) {
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selectors[i] = Switcher();
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selectors[i].sel <== pathIndices[i];
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selectors[i].L <== computedPath[i];
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selectors[i].R <== pathElements[i];
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hashers[i] = Poseidon(2);
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hashers[i].inputs[0] <== selectors[i].outL;
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hashers[i].inputs[1] <== selectors[i].outR;
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computedPath[i + 1] <== hashers[i].out;
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}
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// DEBUG OUTPUTS - expose both values
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signal output debugExpectedRoot;
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signal output debugComputedRoot;
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debugExpectedRoot <== root;
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debugComputedRoot <== computedPath[levels];
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// Temporarily comment out assertion
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//just generate proof done exclude yet
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//root === computedPath[levels];
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}
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template LicenseVerification(merkleTreeLevels) {
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// Private inputs - these remain hidden
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signal input licenseNumber;
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signal input practitionerName;
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signal input issuedDate;
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signal input expiryDate;
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signal input jurisdiction;
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signal input pathElements[merkleTreeLevels];
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signal input pathIndices[merkleTreeLevels];
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// Public inputs - these are revealed
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signal input merkleRoot;
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signal input currentTimestamp;
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signal input minExpiryTimestamp; // Proves license valid at least until this date
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// Hash the license data to create the leaf
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component hasher = Poseidon(5);
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hasher.inputs[0] <== licenseNumber;
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hasher.inputs[1] <== practitionerName;
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hasher.inputs[2] <== issuedDate;
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hasher.inputs[3] <== expiryDate;
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hasher.inputs[4] <== jurisdiction;
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signal leaf <== hasher.out;
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// Verify the license is in the Merkle tree
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component merkleChecker = MerkleTreeChecker(merkleTreeLevels);
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merkleChecker.leaf <== leaf;
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merkleChecker.root <== merkleRoot;
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for (var i = 0; i < merkleTreeLevels; i++) {
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merkleChecker.pathElements[i] <== pathElements[i];
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merkleChecker.pathIndices[i] <== pathIndices[i];
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}
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// Check license is not expired
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component notExpired = GreaterThan(32);
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notExpired.in[0] <== expiryDate;
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notExpired.in[1] <== currentTimestamp;
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// Check license is valid for at least the minimum required period
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component validUntilMin = GreaterEqThan(32);
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validUntilMin.in[0] <== expiryDate;
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validUntilMin.in[1] <== minExpiryTimestamp;
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// Check license was issued before current time (sanity check)
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component wasIssued = LessThan(32);
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wasIssued.in[0] <== issuedDate;
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wasIssued.in[1] <== currentTimestamp;
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// All checks must pass
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signal output isValid;
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isValid <== notExpired.out * validUntilMin.out; // * wasIssued.out;
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signal output debugExpectedRoot;
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signal output debugComputedRoot;
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debugExpectedRoot <== merkleChecker.debugExpectedRoot;
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debugComputedRoot <== merkleChecker.debugComputedRoot;
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}
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// Main component with 17 levels (supports ~132k licenses)
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component main {public [merkleRoot, currentTimestamp, minExpiryTimestamp]} = LicenseVerification(17); |