From 6582e29a7e2633caec7e73a37daa976e70286fd5 Mon Sep 17 00:00:00 2001
From: Kirill Fomichev <fanatid@ya.ru>
Date: Fri, 12 Feb 2016 13:21:36 +0300
Subject: [PATCH] benchmark: replace seedable fixture generator

Replace sha256-hash based generator to XorShift128+ from package xorshift.js
---
 benchmarks/index.js     | 14 +++++++-------
 benchmarks/package.json |  7 ++++---
 benchmarks/prng.js      | 32 --------------------------------
 3 files changed, 11 insertions(+), 42 deletions(-)
 delete mode 100644 benchmarks/prng.js

diff --git a/benchmarks/index.js b/benchmarks/index.js
index 229eb9d..3d15563 100644
--- a/benchmarks/index.js
+++ b/benchmarks/index.js
@@ -2,19 +2,19 @@
 
 var benchmark = require('benchmark');
 var crypto = require('crypto');
-var PRNG = require('./prng');
 var bn = require('../');
 var bignum = require('bignum');
 var sjcl = require('eccjs').sjcl.bn;
 var bigi = require('bigi');
 var BigInteger = require('js-big-integer').BigInteger;
 var SilentMattBigInteger = require('biginteger').BigInteger;
+var XorShift128Plus = require('xorshift.js').XorShift128Plus;
 var benchmarks = [];
 
 var selfOnly = process.env.SELF_ONLY;
-var seed = process.env.SEED || crypto.randomBytes(32).toString('hex');
+var seed = process.env.SEED || crypto.randomBytes(16).toString('hex');
 console.log('Seed: ' + seed);
-var prng = new PRNG(seed);
+var prng = new XorShift128Plus(seed);
 
 var fixtures = [];
 var findex = 0;
@@ -87,10 +87,10 @@ while (fixtures.length < 25) {
   var fixture = {};
   fixtures.push(fixture);
 
-  var a = prng.getHexString(64);
-  var b = prng.getHexString(64);
-  var aj = prng.getHexString(1536);
-  var bj = prng.getHexString(1536);
+  var a = prng.randomBytes(32).toString('hex');
+  var b = prng.randomBytes(32).toString('hex');
+  var aj = prng.randomBytes(768).toString('hex');
+  var bj = prng.randomBytes(768).toString('hex');
 
   // BN
   fixture.a1 = new bn(a, 16);
diff --git a/benchmarks/package.json b/benchmarks/package.json
index 1aababf..56b7faf 100644
--- a/benchmarks/package.json
+++ b/benchmarks/package.json
@@ -10,10 +10,11 @@
   "license": "MIT",
   "dependencies": {
     "benchmark": "^1.0.0",
-    "bignum": "^0.11.0",
-    "eccjs": "^0.3.1",
     "bigi": "*",
     "biginteger": "*",
-    "js-big-integer": "*"
+    "bignum": "^0.11.0",
+    "eccjs": "^0.3.1",
+    "js-big-integer": "*",
+    "xorshift.js": "^1.0.0"
   }
 }
diff --git a/benchmarks/prng.js b/benchmarks/prng.js
deleted file mode 100644
index 50a14d3..0000000
--- a/benchmarks/prng.js
+++ /dev/null
@@ -1,32 +0,0 @@
-'use strict';
-
-var crypto = require('crypto');
-
-/**
- * @class PRNG
- * @constructor
- * @param {string} seed
- */
-function PRNG (seed) {
-  this._seed = seed;
-  this._count = 0;
-  this._digest = '';
-}
-
-/**
- * @param {number} count
- * @return {string}
- */
-PRNG.prototype.getHexString = function (count) {
-  while (count > this._digest.length) {
-    var data = this._seed + (this._count++).toString(16);
-    var digest = crypto.createHash('sha256').update(data).digest('hex');
-    this._digest = this._digest.concat(digest);
-  }
-
-  var result = this._digest.slice(0, count);
-  this._digest = this._digest.slice(count);
-  return result;
-};
-
-module.exports = PRNG;