以太坊的私钥、公钥、地址

ethereum-key-address.js

/*
 * 安装nvm和相应npm包
 * $ nvm install v8.9.4
 * $ npm install keccakjs secp256k1
 */

const { randomBytes } = require('crypto')
const secp256k1 = require('secp256k1')
const SHA3 = require('keccakjs')

/*
 * 私钥：secp256k1(ECDSA)的私钥(256 bits 随机数)
 */

//生成随机私钥
function generatePrivateKey()
{
    let private_key
    do {
        private_key = randomBytes(32)
    } while (!secp256k1.privateKeyVerify(private_key));
    return private_key
}

//导入16进制编码的私钥
//e.g. openssl rand -hex 32
function loadPrivateKeyFromHexString(hex_string)
{
    if (hex_string.slice(0, 2) == '0x') {
        hex_string = hex_string.slice(2);
    }
    if (hex_string.length != 64) {
        return null;
    }
    return new Buffer(hex_string, 'hex')
}

/*
 * 公钥：在secp256k1规范下，由私钥和规范中指定的生成点计算出的坐标(x, y)
 *      非压缩格式公钥： [前缀0x04] + x + y (65字节)
 *      压缩格式公钥：[前缀0x02或0x03] + x ，其中前缀取决于 y 的符号
 */
//生成公钥: 输入的私钥应当是buffer
function generatePublicKey(private_key, compressed = false)
{
    let public_key = secp256k1.publicKeyCreate(private_key, compressed)
    return public_key //包含了前缀
}

/*
 * 地址：公钥的sha3-256编码的后20字节，16进制编码的字符串
 */
function generateAddress(public_key)
{
    let h = new SHA3(256)
    h.update(public_key.slice(1)) //去掉前缀
    return h.digest('hex').slice(-40)
}

//let private_key = generatePrivateKey()
let private_key_hex = '22a0b3688dd46ab1a37d6237871913037681d57f628862336bc9c3c468c4a449'
let private_key = loadPrivateKeyFromHexString(private_key_hex)

console.log(private_key.hexSlice())

let public_key = generatePublicKey(private_key)
console.log(public_key.hexSlice())

let address = generateAddress(public_key)
console.log(address)