Node.Js生成比特幣地址代碼解析

更新時間：2018年04月21日 09:11:02 投稿：laozhang

本篇文章給大家分享了關于用NODE.JS生成比特幣地址的相關代碼，對此有興趣的讀者們可以參考測試下。

使用Node.js，IDE采用sublime 3。

var randomBytes = require('randombytes')
var BigInteger = require('bigi')
var ecurve = require('ecurve')
var crypto = require('crypto')
var cs = require('coinstring')
var secp256k1 = ecurve.getCurveByName('secp256k1')
var randombytes = randomBytes(32).toString('hex')
var privateKey = new Buffer(randombytes, 'hex')

console.log("私鑰:" + privateKey.toString('hex'))
var ecparams = ecurve.getCurveByName('secp256k1')
var curvePt = ecparams.G.multiply(BigInteger.fromBuffer(privateKey))
var x = curvePt.affineX.toBuffer(32)
var y = curvePt.affineY.toBuffer(32)

var publicKey = Buffer.concat([new Buffer([0x04]), x, y])
console.log("標準地址:" + publicKey.toString('hex'))


//compressed
publicKey = curvePt.getEncoded(true) //true forces compressed public key
console.log("compressed:" + publicKey.toString('hex'))


var sha = crypto.createHash('sha256').update(publicKey).digest()
var pubkeyHash = crypto.createHash('rmd160').update(sha).digest()

// pubkeyHash of compressed public key
console.log("pubkeyHash:" + pubkeyHash.toString('hex')) 


// address of compressed public key
console.log("壓縮地址：" + cs.encode(pubkeyHash, 0x0)) //<-- 0x0 is for public addresses
//這里還缺失校驗和Base58編碼

console.log(cs.encode(privateKey, 0x80)) //<--- 0x80 is for private addresses


console.log(cs.encode(Buffer.concat([privateKey, new Buffer([0])]), 0x80)) // <-- compressed private address

生成比特幣地址

1.生成隨機私鑰，私鑰是一個32字節(jié)的數(shù) 例如：

8F72F6B29E6E225A36B68DFE333C7CE5E55D83249D3D2CD6332671FA445C4DD3

2.橢圓曲線計算公鑰生成了私鑰之后，我們使用橢圓曲線加密算法（ECDSA-secp256k1）計算私鑰所對應的非壓縮公鑰，生成的公鑰共65字節(jié)，第一個字節(jié)是0x04，后32個字節(jié)是X坐標，32個字節(jié)是Y坐標：公鑰P.X：