From 9941402e713a0b90e79c9f54391c19a4ce4f7bb0 Mon Sep 17 00:00:00 2001
From: littleskunk <jens.heimbuerge@googlemail.com>
Date: Sat, 10 Mar 2018 16:15:56 +0100
Subject: [PATCH 1/2] sign contracts with secp256k1

---
 lib/contract/index.js | 32 +++++++++++++++++++++-----------
 1 file changed, 21 insertions(+), 11 deletions(-)

diff --git a/lib/contract/index.js b/lib/contract/index.js
index 7af43d62..da7faacc 100644
--- a/lib/contract/index.js
+++ b/lib/contract/index.js
@@ -1,14 +1,15 @@
 'use strict';
 
-var assert = require('assert');
-var crypto = require('crypto');
-var merge = require('merge');
-var JSONSchema = require('jsen');
-var stringify = require('json-stable-stringify');
-var bitcore = require('bitcore-lib');
-var constants = require('../constants');
-var Message = require('bitcore-message');
-var ms = require('ms');
+const assert = require('assert');
+const crypto = require('crypto');
+const merge = require('merge');
+const JSONSchema = require('jsen');
+const stringify = require('json-stable-stringify');
+const bitcore = require('bitcore-lib');
+const constants = require('../constants');
+const secp256k1 = require('secp256k1');
+const Message = require('bitcore-message');
+const ms = require('ms');
 
 /**
  * Represents a storage contract between a renter and a farmer
@@ -258,8 +259,17 @@ Contract.prototype.verify = function(actor, pubkeyhash) {
  * @returns {String} externalSignature
  */
 Contract.prototype.signExternal = function(secret) {
-  var message = Message(this.getSigningData());
-  return message.sign(bitcore.PrivateKey.fromString(secret));
+  var keypair = bitcore.PrivateKey.fromString(secret);
+  var hash = Message(this.getSigningData()).magicHash();
+  var signobj = secp256k1.sign(hash,
+    keypair.toBuffer());
+  var sign = bitcore.crypto.Signature.fromDER(
+    secp256k1.signatureExport(signobj.signature)
+  ).toCompact(
+    signobj.recovery, 
+    keypair.toPublicKey().compressed
+  ).toString('base64');
+  return sign;
 };
 
 /**

From fa942c40dca058ab828e617ad6a6e54ef804c04e Mon Sep 17 00:00:00 2001
From: littleskunk <jens.heimbuerge@googlemail.com>
Date: Sat, 10 Mar 2018 16:45:55 +0100
Subject: [PATCH 2/2] benchmark test sign contract

---
 bench/index.js | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/bench/index.js b/bench/index.js
index 83979dad..abc9ad19 100644
--- a/bench/index.js
+++ b/bench/index.js
@@ -116,6 +116,11 @@ function signMessage(deferred) {
   });
 }
 
+function signContract(deferred) {
+  contract1.sign('renter', renterPrivateKey);
+  deferred.resolve();
+}
+
 suite.add('new hd contract', newHDContract, {maxTime: maxTime});
 suite.add('new contract', newContract, {maxTime: maxTime});
 suite.add('verify message with hd contact', verifyHDContact, {
@@ -130,6 +135,10 @@ suite.add('sign message', signMessage, {
   maxTime: maxTime,
   defer: true
 });
+suite.add('sign contract', signContract, {
+  maxTime: maxTime,
+  defer: true
+});
 
 suite.on('cycle', function(event) {
   console.log(String(event.target));