ECPubKey: improve tests and extract test data to fixtures

The use of fixtures allows for more behavioural driven tests and simpler
addition of more test cases in future.

However, as ECPubKey is just a wrapper around other strenuously tested
modules, the test data is currently limited to testing a subset of the
total wrapper.

This should probably be done better by using mocked out modules instead.

test/ecpubkey.js

@@ -1,95 +1,104 @@
 var assert = require('assert')
+var crypto = require('../src/crypto')
+var sec = require('../src/sec')
+var ecparams = sec('secp256k1')
 
+var BigInteger = require('bigi')
+var ECPointFp = require('../src/ec').ECPointFp
 var ECPubKey = require('../src/ecpubkey')
 
+var fixtures = require('./fixtures/ecpubkey')
+
 describe('ECPubKey', function() {
-  describe('toBuffer/toHex', function() {
-    var hcpub = '024b12d9d7c77db68388b6ff7c89046174c871546436806bcd80d07c28ea811992'
-    var hpub = '044b12d9d7c77db68388b6ff7c89046174c871546436806bcd80d07c28ea81199283fbec990dad6fb98f93f712d50cb874dd717de6a184158d63886dda3090f566'
+  var Q
+
+  beforeEach(function() {
+    var curve = ecparams.getCurve()
+
+    Q = new ECPointFp(
+      curve,
+      curve.fromBigInteger(new BigInteger(fixtures.Q.x)),
+      curve.fromBigInteger(new BigInteger(fixtures.Q.y))
+    )
+  })
 
-    it('using toHex should support compression', function() {
-      var pub = ECPubKey.fromHex(hcpub)
+  describe('constructor', function() {
+    it('defaults to compressed', function() {
+      var pubKey = new ECPubKey(Q)
 
-      assert.equal(pub.toHex(), hcpub)
-      assert.equal(pub.compressed, true)
+      assert.equal(pubKey.compressed, true)
     })
 
-    it('using toHex should support uncompressed', function() {
-      var pub = ECPubKey.fromHex(hpub)
+    it('supports the uncompressed flag', function() {
+      var pubKey = new ECPubKey(Q, false)
 
-      assert.equal(pub.toHex(), hpub)
-      assert.equal(pub.compressed, false)
+      assert.equal(pubKey.compressed, false)
+    })
+  })
+
+  describe('fromHex/toHex', function() {
+    it('supports compressed points', function() {
+      var pubKey = ECPubKey.fromHex(fixtures.compressed.hex)
+
+      assert(pubKey.Q.equals(Q))
+      assert.equal(pubKey.toHex(), fixtures.compressed.hex)
+      assert.equal(pubKey.compressed, true)
+    })
+
+    it('supports uncompressed points', function() {
+      var pubKey = ECPubKey.fromHex(fixtures.uncompressed.hex)
+
+      assert(pubKey.Q.equals(Q))
+      assert.equal(pubKey.toHex(), fixtures.uncompressed.hex)
+      assert.equal(pubKey.compressed, false)
     })
   })
 
   describe('getAddress', function() {
-    var privkeys = [
-      'ca48ec9783cf3ad0dfeff1fc254395a2e403cbbc666477b61b45e31d3b8ab458',
-      '1111111111111111111111111111111111111111111111111111111111111111',
-      '18e14a7b6a307f426a94f8114701e7c8e774e7f9a47e2c2035db29a206321725'
-    ]
-
-    // compressed pubkeys
-    var cpubkeys = [
-      '024b12d9d7c77db68388b6ff7c89046174c871546436806bcd80d07c28ea811992',
-      '034f355bdcb7cc0af728ef3cceb9615d90684bb5b2ca5f859ab0f0b704075871aa',
-      '0250863ad64a87ae8a2fe83c1af1a8403cb53f53e486d8511dad8a04887e5b2352'
-    ]
-
-    var pubkeys = cpubkeys.map(function(x) {
-      var pk = ECPubKey.fromHex(x)
-      pk.compressed = false
-      return pk.toHex()
+    it('calculates the expected hash (compressed)', function() {
+      var pubKey = new ECPubKey(Q, true)
+      var address = pubKey.getAddress()
+
+      assert.equal(address.hash.toString('hex'), fixtures.compressed.hash160)
     })
 
-    it('bitcoin', function() {
-      var addresses = [
-        '19SgmoUj4xowEjwtXvNAtYTAgbvR9iBCui',
-        '1MsHWS1BnwMc3tLE8G35UXsS58fKipzB7a',
-        '16UwLL9Risc3QfPqBUvKofHmBQ7wMtjvM'
-      ]
-      var compressedAddresses = [
-        '1AA4sjKW2aUmbtN3MtegdvhYtDBbDEke1q',
-        '1Q1pE5vPGEEMqRcVRMbtBK842Y6Pzo6nK9',
-        '1PMycacnJaSqwwJqjawXBErnLsZ7RkXUAs',
-      ]
-
-      for (var i = 0; i < addresses.length; ++i) {
-        var pub = ECPubKey.fromHex(pubkeys[i])
-        var cpub = ECPubKey.fromHex(cpubkeys[i])
-        cpub.compressed = true
-
-        var addr = addresses[i]
-        var caddr = compressedAddresses[i]
-
-        assert.equal(pub.getAddress().toString(), addr)
-        assert.equal(cpub.getAddress().toString(), caddr)
-      }
+    it('calculates the expected hash (uncompressed)', function() {
+      var pubKey = new ECPubKey(Q, false)
+      var address = pubKey.getAddress()
+
+      assert.equal(address.hash.toString('hex'), fixtures.uncompressed.hash160)
+    })
+
+    it('supports alternative networks', function() {
+      var pubKey = new ECPubKey(Q)
+      var address = pubKey.getAddress(0x09)
+
+      assert.equal(address.version, 0x09)
+      assert.equal(address.hash.toString('hex'), fixtures.compressed.hash160)
     })
+  })
+
+  describe('verify', function() {
+    var pubKey, signature
+    beforeEach(function() {
+      pubKey = new ECPubKey(Q)
 
-    it('testnet', function() {
-      var addresses = [
-        '19SgmoUj4xowEjwtXvNAtYTAgbvR9iBCui',
-        '1MsHWS1BnwMc3tLE8G35UXsS58fKipzB7a',
-        '16UwLL9Risc3QfPqBUvKofHmBQ7wMtjvM'
-      ]
-      var compressedAddresses = [
-        '1AA4sjKW2aUmbtN3MtegdvhYtDBbDEke1q',
-        '1Q1pE5vPGEEMqRcVRMbtBK842Y6Pzo6nK9',
-        '1PMycacnJaSqwwJqjawXBErnLsZ7RkXUAs',
-      ]
-
-      for (var i = 0; i < addresses.length; ++i) {
-        var pub = ECPubKey.fromHex(pubkeys[i])
-        var cpub = ECPubKey.fromHex(cpubkeys[i])
-        cpub.compressed = true
-
-        var addr = addresses[i]
-        var caddr = compressedAddresses[i]
-
-        assert.equal(pub.getAddress().toString(), addr)
-        assert.equal(cpub.getAddress().toString(), caddr)
+      signature = {
+        r: new BigInteger(fixtures.signature.r),
+        s: new BigInteger(fixtures.signature.s)
       }
     })
+
+    it('verifies a valid signature', function() {
+      var hash = crypto.sha256(fixtures.message)
+
+      assert.ok(pubKey.verify(hash, signature))
+    })
+
+    it('doesn\'t verify the wrong signature', function() {
+      var hash = crypto.sha256('mushrooms')
+
+      assert.ok(!pubKey.verify(hash, signature))
+    })
   })
 })

test/fixtures/ecpubkey.js

@@ -0,0 +1,19 @@
+module.exports = {
+  "Q": {
+    "x": "55066263022277343669578718895168534326250603453777594175500187360389116729240",
+    "y": "32670510020758816978083085130507043184471273380659243275938904335757337482424"
+  },
+  "compressed": {
+    "hex": "0279be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798",
+    "hash160": "751e76e8199196d454941c45d1b3a323f1433bd6"
+  },
+  "uncompressed": {
+    "hex": "0479be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798483ada7726a3c4655da4fbfc0e1108a8fd17b448a68554199c47d08ffb10d4b8",
+    "hash160": "91b24bf9f5288532960ac687abb035127b1d28a5"
+  },
+  "message": "vires in numeris",
+  "signature": {
+    "r": "68972263025625296948424563184904289678530916807200550828762374724416876919710",
+    "s": "43478152510424186005054433052302509227777805602212468112169549534899266476898"
+  }
+}