AES

AES.java

@@ -0,0 +1,67 @@
+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;
+  }
+
+  public static void main(String[] args) {
+    final String secretKey = "wwwwww@";
+    String originalString = "Hello Everyone!!";
+    String encryptedString = AES.encrypt(originalString, secretKey);
+    String decryptedString = AES.decrypt(encryptedString, secretKey);
+
+    System.out.println(originalString);
+    System.out.println(encryptedString);
+    System.out.println(decryptedString);
+  }
+}