From 527919e436463d8dd61fb734435d965b2d7b0c5c Mon Sep 17 00:00:00 2001
From: Saurabh Pal <palsaurabh63@gmail.com>
Date: Sun, 24 Oct 2021 14:19:22 +0530
Subject: [PATCH] Create AES_encryption_Algo.java

---
 Algorithms/AES_encryption_Algo.java | 64 +++++++++++++++++++++++++++++
 1 file changed, 64 insertions(+)
 create mode 100644 Algorithms/AES_encryption_Algo.java

diff --git a/Algorithms/AES_encryption_Algo.java b/Algorithms/AES_encryption_Algo.java
new file mode 100644
index 0000000..74db090
--- /dev/null
+++ b/Algorithms/AES_encryption_Algo.java
@@ -0,0 +1,64 @@
+import java.io.UnsupportedEncodingException;
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
+import java.util.Arrays;
+import java.util.Base64;
+ 
+import javax.crypto.Cipher;
+import javax.crypto.spec.SecretKeySpec;
+ 
+public class AES {
+ 
+    private static SecretKeySpec secretKey;
+    private static byte[] key;
+ 
+    public static void setKey(String myKey) 
+    {
+        MessageDigest sha = null;
+        try {
+            key = myKey.getBytes("UTF-8");
+            sha = MessageDigest.getInstance("SHA-1");
+            key = sha.digest(key);
+            key = Arrays.copyOf(key, 16); 
+            secretKey = new SecretKeySpec(key, "AES");
+        } 
+        catch (NoSuchAlgorithmException e) {
+            e.printStackTrace();
+        } 
+        catch (UnsupportedEncodingException e) {
+            e.printStackTrace();
+        }
+    }
+ 
+    public static String encrypt(String strToEncrypt, String secret) 
+    {
+        try
+        {
+            setKey(secret);
+            Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
+            cipher.init(Cipher.ENCRYPT_MODE, secretKey);
+            return Base64.getEncoder().encodeToString(cipher.doFinal(strToEncrypt.getBytes("UTF-8")));
+        } 
+        catch (Exception e) 
+        {
+            System.out.println("Error while encrypting: " + e.toString());
+        }
+        return null;
+    }
+ 
+    public static String decrypt(String strToDecrypt, String secret) 
+    {
+        try
+        {
+            setKey(secret);
+            Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5PADDING");
+            cipher.init(Cipher.DECRYPT_MODE, secretKey);
+            return new String(cipher.doFinal(Base64.getDecoder().decode(strToDecrypt)));
+        } 
+        catch (Exception e) 
+        {
+            System.out.println("Error while decrypting: " + e.toString());
+        }
+        return null;
+    }
+}