From 4a8159a3a5180aae127fabb1dc3c79019dc5842f Mon Sep 17 00:00:00 2001
From: kasuganosoras <akkariins@gmail.com>
Date: Tue, 25 Jun 2019 04:58:05 +0800
Subject: [PATCH] Add golang version

---
 go-version/main.go | 49 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)
 create mode 100755 go-version/main.go

diff --git a/go-version/main.go b/go-version/main.go
new file mode 100755
index 0000000..577287b
--- /dev/null
+++ b/go-version/main.go
@@ -0,0 +1,49 @@
+package main
+
+import (
+	"encoding/hex"
+	"crypto/hmac"
+	"crypto/sha1"
+	"strings"
+	"regexp"
+	"fmt"
+	"os"
+)
+
+func hex2bin(s string) (string) {
+	decoded, err := hex.DecodeString(s)
+	if err != nil {
+		return ""
+	}
+	return fmt.Sprintf("%s", decoded)
+}
+
+func main() {
+	if len(os.Args) == 2 {
+		mac := strings.Replace(os.Args[1], ":", "", -1)
+		if m, _ := regexp.MatchString(`^(\w+)$`, mac); !m {
+			fmt.Println("Invalid Mac Address!")
+		} else {
+			h := hmac.New(sha1.New, []byte(hex2bin("8544E3B47ECA58F9583043F8")))
+			h.Write([]byte(hex2bin(mac)))
+			key := hex.EncodeToString(h.Sum(nil))[0:24]
+			result := ""
+			s := 0
+			keylen := len([]rune(key))
+			for i := 0; i < keylen; i++ {
+				s++
+				result += string(key[i])
+				if s == 4 && i != keylen - 1 {
+					result += "-"
+					s = 0
+				}
+			}
+			fmt.Println(result)
+		}
+	} else {
+		fmt.Println("Supermicro IPMI License Generator")
+		fmt.Println("https://github.com/kasuganosoras/SuperMicro-IPMI-LicenseGenerator")
+		fmt.Println("Argument is missing, please append your BMC-MAC after this command.")
+		fmt.Println("Example: " + os.Args[0] + " 0c:c4:7a:3e:2f:de")
+	}
+}