AES Encryption

AES Example

import android.util.Base64;

import java.security.NoSuchAlgorithmException;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.KeySpec;

import javax.crypto.Cipher;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.SecretKeySpec;

public class AES {

    private static final int pswdIterations = 10;
    private static final int keySize = 128;
    private static final String cypherInstance = "AES/CBC/PKCS5Padding";
    private static final String secretKeyInstance = "PBKDF2WithHmacSHA1";

    public static String encrypt(String textToEncrypt, String initializationVector, String plainText, String AESSalt) throws Exception {
        SecretKeySpec skeySpec = new SecretKeySpec(getRaw(plainText, AESSalt), "AES");
        Cipher cipher = Cipher.getInstance(cypherInstance);
        cipher.init(Cipher.ENCRYPT_MODE, skeySpec, new IvParameterSpec(initializationVector.getBytes()));
        byte[] encrypted = cipher.doFinal(textToEncrypt.getBytes());
        return Base64.encodeToString(encrypted, Base64.DEFAULT);
    }

    public static String decrypt(String textToDecrypt, String initializationVector, String plainText, String AESSalt) throws Exception {
        byte[] encryted_bytes = Base64.decode(textToDecrypt, Base64.DEFAULT);
        SecretKeySpec skeySpec = new SecretKeySpec(getRaw(plainText, AESSalt), "AES");
        Cipher cipher = Cipher.getInstance(cypherInstance);
        cipher.init(Cipher.DECRYPT_MODE, skeySpec, new IvParameterSpec(initializationVector.getBytes()));
        byte[] decrypted = cipher.doFinal(encryted_bytes);
        return new String(decrypted, "UTF-8");
    }

    private static byte[] getRaw(String plainText, String salt){
        try{
            SecretKeyFactory factory = SecretKeyFactory.getInstance(secretKeyInstance);
            KeySpec spec = new PBEKeySpec(plainText.toCharArray(), salt.getBytes(), pswdIterations, keySize);
            return factory.generateSecret(spec).getEncoded();
        }catch(InvalidKeySpecException e){
            e.printStackTrace();
        }catch(NoSuchAlgorithmException e){
            e.printStackTrace();
        }
        return new byte[0];
    }
}






//TO USE
//ENCRYPT
encrypt("ACTUAL STRING YOU WANT TO DECRYPT", "INIT VALIDATION KEY - WHAT EVER YOU WANT", "PLAIN TEXT - WHAT EVERY YOU WANT", "SALT - WHAT EVER YOU WANT");

//DECRYPT
decrypt("HASH VALUE - AKA WHATEVER THE STRING FROM DECRYPT WAS", "INIT VALIDATION KEY - WHAT EVER YOU WANT", "PLAIN TEXT - WHAT EVERY YOU WANT", "SALT - WHAT EVER YOU WANT");