39 lines
1.3 KiB
JavaScript
39 lines
1.3 KiB
JavaScript
var assert = require('assert')
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var bigi = require('bigi')
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var bitcoin = require('../../')
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describe('bitcoinjs-lib (darkwallet examples)', function() {
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it('can generate a single-key stealth address', function() {
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var receiver = bitcoin.ECKey.fromWIF('5KYZdUEo39z3FPrtuX2QbbwGnNP5zTd7yyr2SC1j299sBCnWjss')
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var sender = bitcoin.ECKey.fromWIF('Kxr9tQED9H44gCmp6HAdmemAzU3n84H3dGkuWTKvE23JgHMW8gct') // XXX: ephemeral, must be random to preserve privacy
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var G = bitcoin.ECKey.curve.G
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var d = receiver.d // secret (receiver only)
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var Q = receiver.pub.Q // shared
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var e = sender.d // secret (sender only)
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var P = sender.pub.Q // shared
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// derived shared secret
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var eQ = Q.multiply(e) // sender
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var dP = P.multiply(d) // receiver
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assert.deepEqual(eQ.getEncoded(), dP.getEncoded())
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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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// derived public key
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var QprimeS = Q.add(cG)
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var QprimeR = G.multiply(d.add(c))
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assert.deepEqual(QprimeR.getEncoded(), QprimeS.getEncoded())
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// derived shared-secret address
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var address = new bitcoin.ECPubKey(QprimeS).getAddress().toString()
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assert.equal(address, '1EwCNJNZM5q58YPPTnjR1H5BvYRNeyZi47')
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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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