From 7de3cfcefa3b589ccdce0adae3bfd5922fec8567 Mon Sep 17 00:00:00 2001
From: Paul Shapiro <paulshapiro@users.noreply.github.com>
Date: Tue, 4 Sep 2018 15:06:31 -0400
Subject: [PATCH] removed Math.random replacement with throw pending merge of
 https://github.com/kripken/emscripten/pull/7096 and replaced Math.random in
 list rand index in monero_sendingFunds_utils

---
 cryptonote_utils/cryptonote_utils.js      |  5 ----
 monero_utils/monero_sendingFunds_utils.js | 35 +----------------------
 2 files changed, 1 insertion(+), 39 deletions(-)

diff --git a/cryptonote_utils/cryptonote_utils.js b/cryptonote_utils/cryptonote_utils.js
index c5129ce..746782a 100644
--- a/cryptonote_utils/cryptonote_utils.js
+++ b/cryptonote_utils/cryptonote_utils.js
@@ -34,11 +34,6 @@
 const JSBigInt = require("./biginteger").BigInteger;
 const nettype_utils = require("./nettype");
 //
-Math.random = function()
-{
-	throw "Math.random calls are disallowed (cryptonote_utils) until emscripten has support to override fallback when (!crypto) - see randomFloat_unit() or remove this in fork";
-}
-//
 var cnUtil = function(currencyConfig) 
 {
 	const currency_amount_format_utils = require("../cryptonote_utils/money_format_utils")(currencyConfig)
diff --git a/monero_utils/monero_sendingFunds_utils.js b/monero_utils/monero_sendingFunds_utils.js
index 8aa267c..2dfa2c9 100644
--- a/monero_utils/monero_sendingFunds_utils.js
+++ b/monero_utils/monero_sendingFunds_utils.js
@@ -798,41 +798,8 @@ function new_moneroReadyTargetDescriptions_fromTargetDescriptions(
 		},
 	);
 }
-//
-function randomFloat_unit()
-{ // https://stackoverflow.com/questions/34575635/cryptographically-secure-float?answertab=oldest#tab-top
-	// I've produced this function to replace Math.random, which we are black-holing to prevent emscripten from ever being able to call it (not that it is)
-	let buffer = new ArrayBuffer(8); // A buffer with just the right size to convert to Float64
-	let ints = new Int8Array(buffer); // View it as an Int8Array and fill it with 8 random ints
-	window.crypto.getRandomValues(ints);
-	//
-	// Set the sign (ints[7][7]) to 0 and the
-	// exponent (ints[7][6]-[6][5]) to just the right size 
-	// (all ones except for the highest bit)
-	ints[7] = 63;
-	ints[6] |= 0xf0;
-	//
-	// Now view it as a Float64Array, and read the one float from it
-	let float = new DataView(buffer).getFloat64(0, true) - 1;
-	//
-	return float; 
-
-// Probably another way of doing this if the above is not good enough:
-/*
-	if (typeof crypto !== "undefined") {
-	    var randomBuffer = new Uint8Array(1);
-        crypto.getRandomValues(randomBuffer);
-        //
-        return randomBuffer[0] / 256.0;
-	} else if (ENVIRONMENT_IS_NODE) {
-		return require("crypto")["randomBytes"](1)[0] / 256.0
-	} else {
-		throw "Unable to support randomFloat_unit without window.crypto or a \"crypto\" module"
-	}
-*/
-} 
 function __randomIndex(list) {
-	return Math.floor(randomFloat_unit() * list.length);
+	return Math.floor(Math.random() * list.length);
 }
 function _popAndReturnRandomElementFromList(list) {
 	var idx = __randomIndex(list);