From eeb1d97a6f7cec715e47aecdfb53eddcb7f71f5d Mon Sep 17 00:00:00 2001
From: kasuganosoras <akkariins@gmail.com>
Date: Tue, 25 Jun 2019 12:17:30 +0800
Subject: [PATCH] Add java version

---
 java-version/main.java | 87 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 87 insertions(+)
 create mode 100755 java-version/main.java

diff --git a/java-version/main.java b/java-version/main.java
new file mode 100755
index 0000000..bae6ceb
--- /dev/null
+++ b/java-version/main.java
@@ -0,0 +1,87 @@
+import java.io.UnsupportedEncodingException;
+import java.security.InvalidKeyException;
+import java.security.NoSuchAlgorithmException;
+import javax.crypto.Mac;
+import javax.crypto.spec.SecretKeySpec;
+import java.util.regex.*;
+
+public class main {
+
+    public static String HMAC_HASH(byte[] data, byte[] key) {
+        try {
+            SecretKeySpec signingKey = new SecretKeySpec(key, "HmacSHA1");
+            Mac mac = Mac.getInstance("HmacSHA1");
+            mac.init(signingKey);
+            return byte2hex(mac.doFinal(data));
+        } catch (NoSuchAlgorithmException | InvalidKeyException e) {
+            e.printStackTrace();
+        }
+        return null;
+    }
+
+    public static String byte2hex(byte[] b) {
+        StringBuilder hs = new StringBuilder();
+        String stmp;
+        for (int n = 0; b != null && n < b.length; n++) {
+            stmp = Integer.toHexString(b[n] & 0XFF);
+            if (stmp.length() == 1) {
+                hs.append('0');
+            }
+            hs.append(stmp);
+        }
+        return hs.toString().toUpperCase();
+    }
+
+    public static byte[] hex2bin(String hex) throws NumberFormatException {
+        if (hex.length() % 2 > 0) {
+            throw new NumberFormatException("Hexadecimal input string must have an even length.");
+        }
+        byte[] r = new byte[hex.length() / 2];
+        for (int i = hex.length(); i > 0;) {
+            r[i / 2 - 1] = (byte) (digit(hex.charAt(--i)) | (digit(hex.charAt(--i)) << 4));
+        }
+        return r;
+    }
+
+    private static int digit(char ch) {
+        int r = Character.digit(ch, 16);
+        if (r < 0) {
+            throw new NumberFormatException("Invalid hexadecimal string: " + ch);
+        }
+        return r;
+    }
+
+    public static void main(String[] args) throws UnsupportedEncodingException {
+        if (args.length == 1) {
+            String mac = args[0].replaceAll("\\:", "");
+            if (!Pattern.matches("^(\\w+){12}$", mac)) {
+                System.out.println("Invalid Mac Address!");
+                System.exit(1);
+            }
+            try {
+                String key = HMAC_HASH(hex2bin(mac), hex2bin("8544E3B47ECA58F9583043F8")).substring(0, 24);
+                String result = "";
+                int s = 0;
+                for (int i = 0; i < key.length(); i++) {
+                    s++;
+                    result += key.substring(i, i + 1).toLowerCase();
+                    if (s == 4 && i != key.length() - 1) {
+                        result += "-";
+                        s = 0;
+                    }
+                }
+                System.out.println(result);
+            } catch (NumberFormatException ex) {
+                System.out.println("Invalid Mac Address!");
+                System.exit(1);
+            } catch (Exception ex) {
+                System.out.println("Error: " + ex.getMessage());
+                System.exit(1);
+            }
+        } else {
+            System.out.println("Supermicro IPMI License Generator");
+            System.out.println("https://github.com/kasuganosoras/SuperMicro-IPMI-LicenseGenerator");
+            System.out.println("Argument is missing, please append your BMC-MAC after this command.");
+        }
+    }
+}