How to implement Bitcoin address in Node.Js

This time I will bring you Node.JsHow to implement a Bitcoin address, what are the precautions for implementing a Bitcoin address in Node.Js, the following is a practical case, let’s come together take a look.

Use Node.js, IDE uses 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("私钥:" + 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("标准地址:" + 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("压缩地址：" + cs.encode(pubkeyHash, 0x0)) //<-- 0x0 is for public addresses
//这里还缺失校验和Base58编码
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

Generate Bitcoin address

1. Generate a random private key. The private key is a 32-byte number. For example:

8F72F6B29E6E225A36B68DFE333C7CE5E55D83249D3D2CD6332671FA445C4DD3

2. Elliptic curve calculation public key After generating the private key, we use the elliptic curve encryption algorithm (ECDSA-secp256k1) to calculate the uncompressed public key corresponding to the private key. The generated public key is 65 bytes in total. First The first byte is 0x04, the last 32 bytes are the X coordinate, and the last 32 bytes are the Y coordinate: Public key P. DB985072968C72B036ED97BA2EF2DECE2ABCA5BE14792

Public key:

##0459DEE66AB619C4A9E215D070052D1AE3A2075E5F58C67516B2E4884 A88C79BE9A5FA8CCD255FB0A7A75DB985072968C72B036ED97BA2EF2DECE2ABCA5BE14 792

3. Calculate the SHA-256 hash value of the public key

##ae9c74647a8c2f50fd832e397e36dbad05d86db3fe3d959a7c8a07c1ddda40c6

4. Calculate the RIPEMD-160 hash value

05f9d05358aab2a28f19910036e67a7295b14aac

5. Add the address version number (Bitcoin mainnet 0x00)

0005f9d05358aab2a28f19910036e67a7295b14aac

In fact, this is almost the same, which is the compressed address finally generated by the above code.

But in actual Bitcoin, verification must be added

6. Calculate the SHA-256 hash value

##9f35b0c37977a302512c22f586dd8da4ae1d20399f2ad3f75df23fbc024b4b2d

7. Calculate the SHA-256 hash value again

4b4f9bc87616687957db64efaf4efb2c00d1d93d549a0b70b15812936046d0ac

8. Take the first 4 bytes of the previous step result (8-digit hexadecimal System)

4b4f9bc8

9. Add these 4 bytes to the end of the compression address generated in step 5

0005f9d05358aab2a28f19910036e67a7295b14aac4b4f9bc8

10. Use Base58 encoding

Base58 consists of 1-9 and English characters except i, l, 0, o. Base58 encode the result of the previous step and get:

1YbeKoyePe8gxyAYh4E3Qyqb15Nnepmod

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other php Chinese websites related articles!

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