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index.ts
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index.ts
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import * as crypto from 'crypto';
import { type } from 'os';
class Transaction{
constructor(
public amount:number,
public payer:string,//publicKey
public payee:string//publicKey
){}
toString(){
return JSON.stringify(this);
}
}
class Block{
public nonce = Math.round(Math.random()*999999999);
constructor(
public prevHash:string,
public transaction: Transaction,
public ts = Date.now()
){}
get hash(){
const str = JSON.stringify(this);
const hash = crypto.createHash('SHA256');
hash.update(str).end();
return hash.digest('hex');
}
}
class Chain{
public static instance = new Chain();
chain: Block[];
constructor(){
this.chain = [new Block("", new Transaction(100, 'genesis', 'sanskar'))];
}
get lastBlock(){
return this.chain[this.chain.length -1];
}
addBlock(transaction: Transaction, senderPublicKey: string, signature:Buffer){
const verifier = crypto.createVerify('SHA256');
verifier.update(transaction.toString());
const isValid = verifier.verify(senderPublicKey, signature);
if(isValid) {
const newBlock = new Block(this.lastBlock.hash, transaction);
this.mine(newBlock.nonce);
this.chain.push(newBlock);
}
}
mine(nonce: number){
let solution=1;
console.log("mining");
while(true){
const hash = crypto.createHash('MD5');
hash.update((nonce+solution).toString()).end();
const attempt = hash.digest('hex');
if(attempt.substring(0,4)=="0000"){
console.log("Solved");
return solution;
}
solution+=1;
}
}
}
class Wallet{
public publicKey: string;
public privateKey: string;
constructor(){
const keypair = crypto.generateKeyPairSync('rsa', {
modulusLength: 2048,
publicKeyEncoding: {type:'spki', format:'pem'},
privateKeyEncoding: {type:'pkcs8', format:'pem'}
});
this.privateKey = keypair.privateKey;
this.publicKey = keypair.publicKey;
}
sendMoney(amount:number, payeePublicKey:string){
const transaction = new Transaction(amount, this.publicKey, payeePublicKey);
const sign = crypto.createSign('SHA256');
sign.update(transaction.toString()).end();
const signature = sign.sign(this.privateKey);
Chain.instance.addBlock(transaction, this.publicKey, signature)
}
}
const sanskar = new Wallet();
const santosh = new Wallet();
const gosavi = new Wallet();
sanskar.sendMoney(100, santosh.publicKey);
santosh.sendMoney(5, gosavi.publicKey);
console.log(Chain.instance);