From bf11085207109e8841f9cc44e68d112c66726dca Mon Sep 17 00:00:00 2001
From: Georg Pfuetzenreuter <mail@georg-pfuetzenreuter.net>
Date: Sat, 28 Sep 2024 20:41:47 +0200
Subject: [PATCH] Init

Signed-off-by: Georg Pfuetzenreuter <mail@georg-pfuetzenreuter.net>
---
 .gitignore |  1 +
 README.md  | 18 ++++++++++++++++++
 go.mod     |  3 +++
 main.go    | 28 ++++++++++++++++++++++++++++
 4 files changed, 50 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 README.md
 create mode 100644 go.mod
 create mode 100644 main.go

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..63be32a
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+go-overflow-sample
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..85b1c44
--- /dev/null
+++ b/README.md
@@ -0,0 +1,18 @@
+```
+$ go build
+
+$ ./go-overflow-sample 999999999999999999
+1492596583345867513
+
+$ ./go-overflow-sample 9999999999999999999
+Could not convert argument to int64
+panic: crypto/rand: argument to Int is <= 0
+
+goroutine 1 [running]:
+crypto/rand.Int({0x4d0b88?, 0xc000014060?}, 0x0?)
+        /usr/lib64/go/1.22/src/crypto/rand/util.go:64 +0x2ca
+main.RandInt(0x4d0b08?)
+        /home/georg/Work/git/go-overflow-sample/main.go:23 +0x86
+main.main()
+        /home/georg/Work/git/go-overflow-sample/main.go:18 +0xdc
+```
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..c6adf8b
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,3 @@
+module go-overflow-sample
+
+go 1.22.6
diff --git a/main.go b/main.go
new file mode 100644
index 0000000..ba5c655
--- /dev/null
+++ b/main.go
@@ -0,0 +1,28 @@
+package main
+
+import "crypto/rand"
+import "math/big"
+import "fmt"
+import "os"
+import "strconv"
+
+func main() {
+	if len(os.Args) < 2 {
+		fmt.Println("Pass a number")
+		os.Exit(1)
+	}
+	number, err := strconv.Atoi(os.Args[1])
+	if err != nil {
+		fmt.Println("Could not convert argument to int64")
+	}
+	RandInt(int64(number * 100))
+
+}
+
+func RandInt(max int64) {
+	i, err := rand.Int(rand.Reader, big.NewInt(int64(max)))
+	if err != nil {
+		fmt.Println("Could not randomize")
+	}
+	fmt.Println(i.Uint64())
+}