Question

java cryptography extension with an example from end to end with code explanation. it should support Java 8 and AES 256.

how to do encrypt and decrypt the specific example.

Enable AES 256-bit encryption for Java 8 with a sample developed code and workflow. Thank you so much.

Answer 1

AES 256 Encryption:

Java program to encrypt a password (or any information) using AES 256 bits.

AES256 encryption example:

private static String secretKey = "boooooooooom!!!!";

private static String salt = "ssshhhhhhhhhhh!!!!";

public static String encrypt(String strToEncrypt, String secret)

{

    try

    {

        byte[] iv = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };

        IvParameterSpec ivspec = new IvParameterSpec(iv);

         

        SecretKeyFactory factory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA256");

        KeySpec spec = new PBEKeySpec(secretKey.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 Base64.getEncoder().encodeToString(cipher.doFinal(strToEncrypt.getBytes("UTF-8")));

    }

    catch (Exception e)

    {

        System.out.println("Error while encrypting: " + e.toString());

    }

    return null;

}

AES 256 Decryption:

Java program to decrypt a password (or any information) using AES 256 bits:

AES256 decryption example:

private static String secretKey = "boooooooooom!!!!";

private static String salt = "ssshhhhhhhhhhh!!!!";

public static String decrypt(String strToDecrypt, String secret) {

    try

    {

        byte[] iv = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };

        IvParameterSpec ivspec = new IvParameterSpec(iv);

         

        SecretKeyFactory factory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA256");

        KeySpec spec = new PBEKeySpec(secretKey.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 new String(cipher.doFinal(Base64.getDecoder().decode(strToDecrypt)));

    }

    catch (Exception e) {

        System.out.println("Error while decrypting: " + e.toString());

    }

    return null;

}

Java AES 256 Example:

Let’s test our AES256 encryption and decryption methods with a simple string.

public static void main(String[] args)

{

    String originalString = "howtodoinjava.com";

     

    String encryptedString = AES.encrypt(originalString, secretKey) ;

    String decryptedString = AES.decrypt(encryptedString, secretKey) ;

      

    System.out.println(originalString);

    System.out.println(encryptedString);

    System.out.println(decryptedString);

}

Program output:

howtodoinjava.com

biXhp3Ha1fgxVEp48zHrvVoXMStmxPuAPHo3TVz5lHU=

howtodoinjava.com