Untitled

import java.nio.charset.StandardCharsets; 
import java.security.spec.KeySpec; 
import java.util.Base64; 
import javax.crypto.Cipher; 
import javax.crypto.SecretKey; 
import javax.crypto.SecretKeyFactory; 
import javax.crypto.spec.IvParameterSpec; 
import javax.crypto.spec.PBEKeySpec; 
import javax.crypto.spec.SecretKeySpec; 

class AES { 

	private static final String SECRET_KEY 
		= "my_super_secret_key_ho_ho_ho"; 
	
	private static final String SALT = "ssshhhhhhhhhhh!!!!"; 

	// This method use to encrypt to string 
	public static String encrypt(String strToEncrypt) 
	{ 
		try { 

			// Create default byte array 
			byte[] iv = { 0, 0, 0, 0, 0, 0, 0, 0, 
						0, 0, 0, 0, 0, 0, 0, 0 }; 
			IvParameterSpec ivspec 
				= new IvParameterSpec(iv); 

			// Create SecretKeyFactory object 
			SecretKeyFactory factory 
				= SecretKeyFactory.getInstance( 
					"PBKDF2WithHmacSHA256"); 
			
			// Create KeySpec object and assign with 
			// constructor 
			KeySpec spec = new PBEKeySpec( 
				SECRET_KEY.toCharArray(), SALT.getBytes(), 
				65536, 256); 
			SecretKey tmp = factory.generateSecret(spec); 
			SecretKeySpec secretKey = new SecretKeySpec( 
				tmp.getEncoded(), "AES"); 

			Cipher cipher = Cipher.getInstance( 
				"AES/CBC/PKCS5Padding"); 
			cipher.init(Cipher.ENCRYPT_MODE, secretKey, 
						ivspec); 
			// Return encrypted string 
			return Base64.getEncoder().encodeToString( 
				cipher.doFinal(strToEncrypt.getBytes( 
					StandardCharsets.UTF_8))); 
		} 
		catch (Exception e) { 
			System.out.println("Error while encrypting: "
							+ e.toString()); 
		} 
		return null; 
	} 

	// This method use to decrypt to string 
	public static String decrypt(String strToDecrypt) 
	{ 
		try { 

			// Default byte array 
			byte[] iv = { 0, 0, 0, 0, 0, 0, 0, 0, 
						0, 0, 0, 0, 0, 0, 0, 0 }; 
			// Create IvParameterSpec object and assign with 
			// constructor 
			IvParameterSpec ivspec 
				= new IvParameterSpec(iv); 

			// Create SecretKeyFactory Object 
			SecretKeyFactory factory 
				= SecretKeyFactory.getInstance( 
					"PBKDF2WithHmacSHA256"); 

			// Create KeySpec object and assign with 
			// constructor 
			KeySpec spec = new PBEKeySpec( 
				SECRET_KEY.toCharArray(), SALT.getBytes(), 
				65536, 256); 
			SecretKey tmp = factory.generateSecret(spec); 
			SecretKeySpec secretKey = new SecretKeySpec( 
				tmp.getEncoded(), "AES"); 

			Cipher cipher = Cipher.getInstance( 
				"AES/CBC/PKCS5PADDING"); 
			cipher.init(Cipher.DECRYPT_MODE, secretKey, 
						ivspec); 
			// Return decrypted string 
			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) 
	{ 
		// Create String variables 
		String originalString = "Hello"; 
		
		// Call encryption method 
		String encryptedString 
			= AES.encrypt(originalString); 
		
		// Call decryption method 
		String decryptedString 
			= AES.decrypt(encryptedString); 

		// Print all strings 
		System.out.println(originalString); 
		System.out.println(encryptedString); 
		System.out.println(decryptedString); 
	} 
}