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import javax.crypto.*;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.util.Base64;

public class StringEncryptor {

    private static final String ALGORITHM = "AES";
    private static final String TRANSFORMATION = "AES/CBC/PKCS5Padding";

    public static void main(String[] args) {
        try {
            // Replace 'yourKey' and 'yourInitializationVector' with your actual key and IV
            String key = "yourKey";
            String iv = "yourInitializationVector";

            String originalString = "Hello, this is a secret message!";
            String encryptedString = encryptString(originalString, key, iv);
            System.out.println("Encrypted String: " + encryptedString);

            String decryptedString = decryptString(encryptedString, key, iv);
            System.out.println("Decrypted String: " + decryptedString);

        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static String encryptString(String input, String key, String iv) throws Exception {
        Cipher cipher = Cipher.getInstance(TRANSFORMATION);
        SecretKeySpec secretKey = new SecretKeySpec(key.getBytes(), ALGORITHM);
        IvParameterSpec ivParameterSpec = new IvParameterSpec(iv.getBytes());

        cipher.init(Cipher.ENCRYPT_MODE, secretKey, ivParameterSpec);

        byte[] encryptedBytes = cipher.doFinal(input.getBytes());
        return Base64.getEncoder().encodeToString(encryptedBytes);
    }

    public static String decryptString(String encryptedInput, String key, String iv) throws Exception {
        Cipher cipher = Cipher.getInstance(TRANSFORMATION);
        SecretKeySpec secretKey = new SecretKeySpec(key.getBytes(), ALGORITHM);
        IvParameterSpec ivParameterSpec = new IvParameterSpec(iv.getBytes());

        cipher.init(Cipher.DECRYPT_MODE, secretKey, ivParameterSpec);

        byte[] decryptedBytes = cipher.doFinal(Base64.getDecoder().decode(encryptedInput));
        return new String(decryptedBytes);
    }
}