libra-peer_to_peer_transfer.js

const crypto = require('crypto');
const grpc = require('grpc');
const protoLoader = require('@grpc/proto-loader');
const protobufjs = require('protobufjs');
const ed25519 = require('ed25519');

const PROTO_DIR = __dirname + '/proto';

const privateKey = Buffer.from('fbcedfd8848bf097ca79a8248a26d929ebf7104c1fcc471a6c4fd87113798766', 'hex');

// SHA3-256 hash of an input.
const hash = (data) => {
	const h = crypto.createHash('sha3-256');
	h.update(data);
	return h.digest();
};

const getAddress = (publicKey) => {
	return hash(publicKey);
}

const getGRpcClient = () => {
	const packageDefinition = protoLoader.loadSync(
		PROTO_DIR + '/admission_control.proto',
		{
			keepCase: true,
			longs: Number,
			enums: String,
			defaults: true,
			bytes: String,
			oneofs: true,
		}
	);
	const protoDescriptor = grpc.loadPackageDefinition(packageDefinition);
	return new protoDescriptor.admission_control.AdmissionControl('ac.testnet.libra.org:8000', grpc.credentials.createInsecure());
};

// Get peer-to-peer transfer transaction object.
const getTransferTransaction = (seq, sender, sendTo, sendAmount) => {
	const amount = Buffer.alloc(8);
	amount.writeUIntLE(sendAmount, 0, 6);
	return {
		senderAccount: sender,
		sequenceNumber: seq,
		script: {
			code: Buffer.from([76,73,66,82,65,86,77,10,1,0,7,1,74,0,0,0,4,0,0,0,3,78,0,0,0,6,0,0,0,12,84,0,0,0,6,0,0,0,13,90,0,0,0,6,0,0,0,5,96,0,0,0,41,0,0,0,4,137,0,0,0,32,0,0,0,7,169,0,0,0,15,0,0,0,0,0,0,1,0,2,0,1,3,0,2,0,2,4,2,0,3,0,3,2,4,2,6,60,83,69,76,70,62,12,76,105,98,114,97,65,99,99,111,117,110,116,4,109,97,105,110,15,112,97,121,95,102,114,111,109,95,115,101,110,100,101,114,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,2,1,4,0,12,0,12,1,19,1,0,2]),
			arguments: [
				{
					type: 1,  // ADDRESS
					data: sendTo,
				},
				{
					type: 0,  // U64
					data: amount,
				}
			],
		},
		maxGasAmount: 140000,
		gasUnitPrice: 0,
		expirationTime: Math.floor(new Date().getTime() / 1000) + 120,
	};
};

const getSignature = (rawTx, privateKey) => {
	return ed25519.Sign(hash(Buffer.concat([hash(Buffer.from('RawTransaction@@$$LIBRA$$@@', 'utf8')), rawTx])), privateKey);
};

const main = async () => {
	
	const keyPair = ed25519.MakeKeypair(privateKey);
	const address = getAddress(keyPair.publicKey);
	
	console.log(`Private key: ${privateKey.toString('hex')}`);
	console.log(`Public Key: ${keyPair.publicKey.toString('hex')}`);
	console.log(`Address: ${address.toString('hex')}`);
	
	
	const tx = getTransferTransaction(
		0,  // sequence
		address,  // sender
		Buffer.from('ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff', 'hex'),  // receiver
		12345  // amount
	);
	console.log(tx);
	const RawTransaction = (await protobufjs.load(PROTO_DIR + '/transaction.proto')).lookupType('types.RawTransaction');
	const rawTx = RawTransaction.encode(RawTransaction.create(tx)).finish();
	const signature = getSignature(rawTx, privateKey);
	console.log(`Signature: ${signature.toString('hex')}`);
	
	getGRpcClient().submitTransaction({
		signed_txn: {
			raw_txn_bytes: rawTx,
			sender_public_key: keyPair.publicKey,
			sender_signature: signature,
		}
	}, (error, response) => {
		if(error) throw error;
		console.log(response);
	});
	
};

main();