var assert = require('assert') var bigi = require('bigi') var bitcoin = require('../../') describe('bitcoinjs-lib (advanced)', function() { it('can sign a bitcoin message', function() { var key = bitcoin.ECKey.fromWIF('5KYZdUEo39z3FPrtuX2QbbwGnNP5zTd7yyr2SC1j299sBCnWjss') var message = 'This is an example of a signed message.' var signature = bitcoin.Message.sign(key, message) assert.equal(signature.toString('base64'), 'G9L5yLFjti0QTHhPyFrZCT1V/MMnBtXKmoiKDZ78NDBjERki6ZTQZdSMCtkgoNmp17By9ItJr8o7ChX0XxY91nk=') }) it('can verify a bitcoin message', function() { var address = '1HZwkjkeaoZfTSaJxDw6aKkxp45agDiEzN' var signature = 'HJLQlDWLyb1Ef8bQKEISzFbDAKctIlaqOpGbrk3YVtRsjmC61lpE5ErkPRUFtDKtx98vHFGUWlFhsh3DiW6N0rE' var message = 'This is an example of a signed message.' assert(bitcoin.Message.verify(address, signature, message)) }) it('can generate a single-key stealth address', function() { var receiver = bitcoin.ECKey.fromWIF('5KYZdUEo39z3FPrtuX2QbbwGnNP5zTd7yyr2SC1j299sBCnWjss') // XXX: ephemeral, must be random (and secret to sender) to preserve privacy var sender = bitcoin.ECKey.fromWIF('Kxr9tQED9H44gCmp6HAdmemAzU3n84H3dGkuWTKvE23JgHMW8gct') var G = bitcoin.ECKey.curve.G var d = receiver.d // secret (receiver only) var Q = receiver.pub.Q // shared var e = sender.d // secret (sender only) var P = sender.pub.Q // shared // derived shared secret var eQ = Q.multiply(e) // sender var dP = P.multiply(d) // receiver assert.deepEqual(eQ.getEncoded(), dP.getEncoded()) var c = bigi.fromBuffer(bitcoin.crypto.sha256(eQ.getEncoded())) var cG = G.multiply(c) // derived public key var QprimeS = Q.add(cG) var QprimeR = G.multiply(d.add(c)) assert.deepEqual(QprimeR.getEncoded(), QprimeS.getEncoded()) // derived shared-secret address var address = new bitcoin.ECPubKey(QprimeS).getAddress().toString() assert.equal(address, '1EwCNJNZM5q58YPPTnjR1H5BvYRNeyZi47') }) // TODO it.skip('can generate a dual-key stealth address', function() {}) it('can create an OP_RETURN transaction', function() { var key = bitcoin.ECKey.fromWIF("L1uyy5qTuGrVXrmrsvHWHgVzW9kKdrp27wBC7Vs6nZDTF2BRUVwy") var tx = new bitcoin.TransactionBuilder() var data = new Buffer('cafedeadbeef', 'hex') var dataScript = bitcoin.scripts.dataOutput(data) tx.addInput("aa94ab02c182214f090e99a0d57021caffd0f195a81c24602b1028b130b63e31", 0) tx.addOutput(dataScript, 1000) tx.sign(0, key) assert.equal(tx.build().toHex(), '0100000001313eb630b128102b60241ca895f1d0ffca2170d5a0990e094f2182c102ab94aa000000006a4730440220578f9df41a0e5c5052ad6eef46d005b41f966c7fda01d5f71e9c65026c9025c002202e0159ea0db47ca1bf7713e3a08bbba8cc4fdd90a2eff12591c42049c7cad6c30121029f50f51d63b345039a290c94bffd3180c99ed659ff6ea6b1242bca47eb93b59fffffffff01e803000000000000086a06cafedeadbeef00000000') }) })