74 lines
2.7 KiB
JavaScript
74 lines
2.7 KiB
JavaScript
/* global describe, it */
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var assert = require('assert')
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var bigi = require('bigi')
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var bitcoin = require('../../')
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var ecurve = require('ecurve')
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var secp256k1 = ecurve.getCurveByName('secp256k1')
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var G = secp256k1.G
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var n = secp256k1.n
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// c = sha256: e * (d * G)
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// cQ = (d * G) + (c * G)
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function stealthSend (e, Q) {
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var eQ = Q.multiply(e) // shared secret
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var c = bigi.fromBuffer(bitcoin.crypto.sha256(eQ.getEncoded()))
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var cG = G.multiply(c)
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var cQ = new bitcoin.ECPair(null, Q.add(cG))
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return cQ
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}
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// c = sha256: d * (e * G)
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// cQ = (d + c) * G
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function stealthReceive (d, eG) {
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var eQ = eG.multiply(d) // shared secret
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var c = bigi.fromBuffer(bitcoin.crypto.sha256(eQ.getEncoded()))
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var cQ = new bitcoin.ECPair(d.add(c).mod(n))
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return cQ
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}
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describe('bitcoinjs-lib (crypto)', function () {
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it('can generate a single-key stealth address', function () {
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// XXX: should be randomly generated, see next test for example
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var recipient = bitcoin.ECPair.fromWIF('5KYZdUEo39z3FPrtuX2QbbwGnNP5zTd7yyr2SC1j299sBCnWjss') // private to recipient
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var nonce = bitcoin.ECPair.fromWIF('KxVqB96pxbw1pokzQrZkQbLfVBjjHFfp2mFfEp8wuEyGenLFJhM9') // private to sender
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// ... recipient reveals public key (recipient.Q) to sender
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var forSender = stealthSend(nonce.d, recipient.Q)
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assert.equal(forSender.getAddress(), '1CcZWwCpACJL3AxqoDbwEt4JgDFuTHUspE')
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assert.throws(function () { forSender.toWIF() }, /Error: Missing private key/)
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// ... sender reveals nonce public key (nonce.Q) to recipient
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var forRecipient = stealthReceive(recipient.d, nonce.Q)
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assert.equal(forRecipient.getAddress(), '1CcZWwCpACJL3AxqoDbwEt4JgDFuTHUspE')
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assert.equal(forRecipient.toWIF(), 'L1yjUN3oYyCXV3LcsBrmxCNTa62bZKWCybxVJMvqjMmmfDE8yk7n')
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// sender and recipient, both derived same address
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assert.equal(forSender.getAddress(), forRecipient.getAddress())
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})
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it('can generate a single-key stealth address (randomly)', function () {
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var recipient = bitcoin.ECPair.makeRandom() // private to recipient
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var nonce = bitcoin.ECPair.makeRandom() // private to sender
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// ... recipient reveals public key (recipient.Q) to sender
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var forSender = stealthSend(nonce.d, recipient.Q)
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assert.throws(function () { forSender.toWIF() }, /Error: Missing private key/)
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// ... sender reveals nonce public key (nonce.Q) to recipient
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var forRecipient = stealthReceive(recipient.d, nonce.Q)
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assert.doesNotThrow(function () { forRecipient.toWIF() })
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// sender and recipient, both derived same address
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assert.equal(forSender.getAddress(), forRecipient.getAddress())
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})
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// TODO
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it.skip('can generate a dual-key stealth address', function () {})
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})
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