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remove commitment from signature

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This commit is contained in:
poma 2021-11-01 18:14:03 +03:00
parent 3fed6e5410
commit ecc3e6b0f5
No known key found for this signature in database
GPG Key ID: BA20CB01FE165657
4 changed files with 6 additions and 9 deletions
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6
circuits/keypair.circom
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@ -12,13 +12,11 @@ template Keypair() {
template Signature() { template Signature() {
signal input privateKey; signal input privateKey;
signal input commitment;
signal input merklePath; signal input merklePath;
signal output out; signal output out;
component hasher = Poseidon(3); component hasher = Poseidon(2);
hasher.inputs[0] <== privateKey; hasher.inputs[0] <== privateKey;
hasher.inputs[1] <== commitment; hasher.inputs[1] <== merklePath;
hasher.inputs[2] <== merklePath;
out <== hasher.out; out <== hasher.out;
} }

3
circuits/transaction.circom
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@ -11,7 +11,7 @@ Utxo structure:
} }
commitment = hash(amount, pubKey, blinding) commitment = hash(amount, pubKey, blinding)
nullifier = hash(commitment, merklePath, sign(commitment + merklePath, privKey)) nullifier = hash(commitment, merklePath, sign(merklePath, privKey))
*/ */
// Universal JoinSplit transaction with nIns inputs and 2 outputs // Universal JoinSplit transaction with nIns inputs and 2 outputs
@ -57,7 +57,6 @@ template Transaction(levels, nIns, nOuts, zeroLeaf) {
inSignature[tx] = Signature(); inSignature[tx] = Signature();
inSignature[tx].privateKey <== inPrivateKey[tx]; inSignature[tx].privateKey <== inPrivateKey[tx];
inSignature[tx].commitment <== inUtxoHasher[tx].out;
inSignature[tx].merklePath <== inPathIndices[tx]; inSignature[tx].merklePath <== inPathIndices[tx];
nullifierHasher[tx] = Poseidon(3); nullifierHasher[tx] = Poseidon(3);

4
src/keypair.js
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@ -85,8 +85,8 @@ class Keypair {
* @param {string|number|BigNumber} merklePath a hex string with merkle path * @param {string|number|BigNumber} merklePath a hex string with merkle path
* @returns {BigNumber} a hex string with signature * @returns {BigNumber} a hex string with signature
*/ */
sign(commitment, merklePath) { sign(merklePath) {
return poseidonHash([this.privkey, commitment, merklePath]) return poseidonHash([this.privkey, merklePath])
} }
/** /**

2
src/utxo.js
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@ -46,7 +46,7 @@ class Utxo {
) { ) {
throw new Error('Can not compute nullifier without utxo index or private key') throw new Error('Can not compute nullifier without utxo index or private key')
} }
const signature = this.keypair.privkey ? this.keypair.sign(this.getCommitment(), this.index || 0) : 0 const signature = this.keypair.privkey ? this.keypair.sign(this.index || 0) : 0
this._nullifier = poseidonHash([this.getCommitment(), this.index || 0, signature]) this._nullifier = poseidonHash([this.getCommitment(), this.index || 0, signature])
} }
return this._nullifier return this._nullifier