33 lines
1021 B
JavaScript
33 lines
1021 B
JavaScript
const { ethers } = require('hardhat')
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const { BigNumber } = ethers
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const { randomBN, poseidonHash } = require('./utils')
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const Keypair = require('./kaypair')
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class Utxo {
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constructor({ amount = 0, keypair = new Keypair(), blinding = randomBN(), index } = {}) {
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this.amount = BigNumber.from(amount)
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this.blinding = BigNumber.from(blinding)
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this.keypair = keypair
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this.index = index
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}
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getCommitment() {
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if (!this._commitment) {
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this._commitment = poseidonHash([this.amount, this.blinding, this.keypair.pubkey])
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}
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return this._commitment
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}
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getNullifier() {
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if (!this._nullifier) {
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if (this.amount > 0 && (this.index === undefined || this.keypair.privkey === undefined || this.keypair.privkey === null)) {
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throw new Error('Can not compute nullifier without utxo index or private key')
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}
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this._nullifier = poseidonHash([this.getCommitment(), this.index || 0, this.keypair.privkey || 0])
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}
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return this._nullifier
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}
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}
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module.exports = Utxo
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