move BIP32 example to own file

Author: dcousens

README.md

@@ -106,10 +106,10 @@ The below examples are implemented as integration tests, they should be very eas
 - [Create an OP RETURN transaction](https://github.com/bitcoinjs/bitcoinjs-lib/blob/master/test/integration/advanced.js#L24)
 - [Create a 2-of-3 multisig P2SH address](https://github.com/bitcoinjs/bitcoinjs-lib/blob/master/test/integration/multisig.js#L9)
 - [Spend from a 2-of-4 multisig P2SH address](https://github.com/bitcoinjs/bitcoinjs-lib/blob/master/test/integration/multisig.js#L25)
-- [Generate a single-key stealth address](https://github.com/bitcoinjs/bitcoinjs-lib/blob/master/test/integration/stealth.js#L11)
-- [Generate a dual-key stealth address](https://github.com/bitcoinjs/bitcoinjs-lib/blob/master/test/integration/stealth.js#L48)
-- [Recover a BIP32 parent private key from the parent public key and a derived non-hardened child private key](https://github.com/bitcoinjs/bitcoinjs-lib/blob/master/test/integration/crypto.js#L14)
-- [Recover a Private key from duplicate R values in a signature](https://github.com/bitcoinjs/bitcoinjs-lib/blob/master/test/integration/crypto.js#L60)
+- [Generate a single-key stealth address](https://github.com/bitcoinjs/bitcoinjs-lib/blob/master/test/integration/stealth.js)
+- [Generate a dual-key stealth address](https://github.com/bitcoinjs/bitcoinjs-lib/blob/master/test/integration/stealth.js)
+- [Recover a BIP32 parent private key from the parent public key and a derived non-hardened child private key](https://github.com/bitcoinjs/bitcoinjs-lib/blob/master/test/integration/bip32.js)
+- [Recover a Private key from duplicate R values in a signature](https://github.com/bitcoinjs/bitcoinjs-lib/blob/master/test/integration/crypto.js)
 - [Create a CLTV locked transaction where the expiry is past](https://github.com/bitcoinjs/bitcoinjs-lib/blob/master/test/integration/cltv.js#L36)
 - [Create a CLTV locked transaction where the parties bypass the expiry](https://github.com/bitcoinjs/bitcoinjs-lib/blob/master/test/integration/cltv.js#L70)
 - [Create a CLTV locked transaction which fails due to expiry in the future](https://github.com/bitcoinjs/bitcoinjs-lib/blob/master/test/integration/cltv.js#L102)

test/integration/bip32.js

@@ -0,0 +1,58 @@
+/* global describe, it */
+
+var assert = require('assert')
+var bigi = require('bigi')
+var bitcoin = require('../../')
+var crypto = require('crypto')
+
+var ecurve = require('ecurve')
+var secp256k1 = ecurve.getCurveByName('secp256k1')
+
+describe('bitcoinjs-lib (BIP32)', function () {
+  it('can recover a BIP32 parent private key from the parent public key, and a derived, non-hardened child private key', function () {
+    function recoverParent (master, child) {
+      assert(!master.keyPair.d, 'You already have the parent private key')
+      assert(child.keyPair.d, 'Missing child private key')
+
+      var curve = secp256k1
+      var QP = master.keyPair.Q
+      var serQP = master.keyPair.getPublicKeyBuffer()
+
+      var d1 = child.keyPair.d
+      var d2
+      var data = new Buffer(37)
+      serQP.copy(data, 0)
+
+      // search index space until we find it
+      for (var i = 0; i < bitcoin.HDNode.HIGHEST_BIT; ++i) {
+        data.writeUInt32BE(i, 33)
+
+        // calculate I
+        var I = crypto.createHmac('sha512', master.chainCode).update(data).digest()
+        var IL = I.slice(0, 32)
+        var pIL = bigi.fromBuffer(IL)
+
+        // See hdnode.js:273 to understand
+        d2 = d1.subtract(pIL).mod(curve.n)
+
+        var Qp = new bitcoin.ECPair(d2).Q
+        if (Qp.equals(QP)) break
+      }
+
+      var node = new bitcoin.HDNode(new bitcoin.ECPair(d2), master.chainCode, master.network)
+      node.depth = master.depth
+      node.index = master.index
+      node.masterFingerprint = master.masterFingerprint
+      return node
+    }
+
+    var seed = crypto.randomBytes(32)
+    var master = bitcoin.HDNode.fromSeedBuffer(seed)
+    var child = master.derive(6) // m/6
+
+    // now for the recovery
+    var neuteredMaster = master.neutered()
+    var recovered = recoverParent(neuteredMaster, child)
+    assert.strictEqual(recovered.toBase58(), master.toBase58())
+  })
+})

test/integration/crypto.js

@@ -5,59 +5,11 @@ var async = require('async')
 var bigi = require('bigi')
 var bitcoin = require('../../')
 var blockchain = require('./_blockchain')
-var crypto = require('crypto')
 
 var ecurve = require('ecurve')
 var secp256k1 = ecurve.getCurveByName('secp256k1')
 
 describe('bitcoinjs-lib (crypto)', function () {
-  it('can recover a BIP32 parent private key from the parent public key, and a derived, non-hardened child private key', function () {
-    function recoverParent (master, child) {
-      assert(!master.keyPair.d, 'You already have the parent private key')
-      assert(child.keyPair.d, 'Missing child private key')
-
-      var curve = secp256k1
-      var QP = master.keyPair.Q
-      var serQP = master.keyPair.getPublicKeyBuffer()
-
-      var d1 = child.keyPair.d
-      var d2
-      var data = new Buffer(37)
-      serQP.copy(data, 0)
-
-      // search index space until we find it
-      for (var i = 0; i < bitcoin.HDNode.HIGHEST_BIT; ++i) {
-        data.writeUInt32BE(i, 33)
-
-        // calculate I
-        var I = crypto.createHmac('sha512', master.chainCode).update(data).digest()
-        var IL = I.slice(0, 32)
-        var pIL = bigi.fromBuffer(IL)
-
-        // See hdnode.js:273 to understand
-        d2 = d1.subtract(pIL).mod(curve.n)
-
-        var Qp = new bitcoin.ECPair(d2).Q
-        if (Qp.equals(QP)) break
-      }
-
-      var node = new bitcoin.HDNode(new bitcoin.ECPair(d2), master.chainCode, master.network)
-      node.depth = master.depth
-      node.index = master.index
-      node.masterFingerprint = master.masterFingerprint
-      return node
-    }
-
-    var seed = crypto.randomBytes(32)
-    var master = bitcoin.HDNode.fromSeedBuffer(seed)
-    var child = master.derive(6) // m/6
-
-    // now for the recovery
-    var neuteredMaster = master.neutered()
-    var recovered = recoverParent(neuteredMaster, child)
-    assert.strictEqual(recovered.toBase58(), master.toBase58())
-  })
-
   it('can recover a private key from duplicate R values', function (done) {
     this.timeout(30000)