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import { ECPair, address, networks } from 'bitcoinjs-lib'
import { randomBytes } from './encryption/cryptoRandom'
import { hashSha256Sync } from './encryption/sha2Hash'
import { hashRipemd160 } from './encryption/hashRipemd160'
import { config } from './config'
/**
*
* @param numberOfBytes
*
* @ignore
*/
export function getEntropy(arg: number): Buffer {
Iif (!arg) {
arg = 32
}
return randomBytes(arg)
}
/**
* @ignore
*/
export function makeECPrivateKey() {
const keyPair = ECPair.makeRandom({ rng: getEntropy })
return keyPair.privateKey.toString('hex')
}
/**
* @ignore
*/
export function publicKeyToAddress(publicKey: string | Buffer) {
const publicKeyBuffer = Buffer.isBuffer(publicKey) ? publicKey : Buffer.from(publicKey, 'hex')
const publicKeyHash160 = hashRipemd160(hashSha256Sync(publicKeyBuffer))
const result = address.toBase58Check(publicKeyHash160, networks.bitcoin.pubKeyHash)
return result
}
/**
* @ignore
*/
export function getPublicKeyFromPrivate(privateKey: string | Buffer) {
const privateKeyBuffer = Buffer.isBuffer(privateKey) ? privateKey : Buffer.from(privateKey, 'hex')
const keyPair = ECPair.fromPrivateKey(privateKeyBuffer)
return keyPair.publicKey.toString('hex')
}
/**
* Time
* @private
* @ignore
*/
export function hexStringToECPair(skHex: string): ECPair.ECPairInterface {
const ecPairOptions = {
network: config.network.layer1,
compressed: true
}
if (skHex.length === 66) {
Iif (skHex.slice(64) !== '01') {
throw new Error('Improperly formatted private-key hex string. 66-length hex usually '
+ 'indicates compressed key, but last byte must be == 1')
}
return ECPair.fromPrivateKey(Buffer.from(skHex.slice(0, 64), 'hex'), ecPairOptions)
} else Iif (skHex.length === 64) {
ecPairOptions.compressed = false
return ECPair.fromPrivateKey(Buffer.from(skHex, 'hex'), ecPairOptions)
} else {
throw new Error('Improperly formatted private-key hex string: length should be 64 or 66.')
}
}
/**
*
* @ignore
*/
export function ecPairToHexString(secretKey: ECPair.ECPairInterface) {
const ecPointHex = secretKey.privateKey.toString('hex')
Eif (secretKey.compressed) {
return `${ecPointHex}01`
} else {
return ecPointHex
}
}
/**
* Creates a bitcoin address string from an ECPair
* @private
* @ignore
*/
export function ecPairToAddress(keyPair: ECPair.ECPairInterface) {
const sha256 = hashSha256Sync(keyPair.publicKey)
const hash160 = hashRipemd160(sha256)
return address.toBase58Check(hash160, keyPair.network.pubKeyHash)
}
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