36 lines
1.0 KiB
JavaScript
36 lines
1.0 KiB
JavaScript
const crypto = require('crypto')
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const ethers = require('ethers')
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const BigNumber = ethers.BigNumber
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const { poseidon } = require('circomlib')
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const poseidonHash = (items) => BigNumber.from(poseidon(items).toString())
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const poseidonHash2 = (a, b) => poseidonHash([a, b])
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/** Generate random number of specified byte length */
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const randomBN = (nbytes = 31) => BigNumber.from(crypto.randomBytes(nbytes))
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/** BigNumber to hex string of specified length */
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const toFixedHex = (number, length = 32) =>
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'0x' +
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(number instanceof Buffer ? number.toString('hex') : BigNumber.from(number).toHexString().slice(2)).padStart(length * 2, '0')
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const toBuffer = (value, length) => Buffer.from(BigNumber.from(value).toHexString().slice(2).padStart(length * 2, '0'), 'hex')
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function bitsToNumber(bits) {
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let result = 0
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for (const item of bits.slice().reverse()) {
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result = (result << 1) + item
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}
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return result
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}
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module.exports = {
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randomBN,
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bitsToNumber,
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toFixedHex,
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toBuffer,
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poseidonHash,
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poseidonHash2,
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}
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