com.js.engine.license.licensegen.AES256.java Source code

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Here is the source code for com.js.engine.license.licensegen.AES256.java

Source

package com.js.engine.license.licensegen;

import java.io.UnsupportedEncodingException;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.Key;
import java.security.NoSuchAlgorithmException;

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

import org.apache.commons.codec.binary.Base64;

public class AES256 {

    private String iv;
    private Key keySpec;

    public AES256(String key) throws UnsupportedEncodingException {
        // TODO Auto-generated constructor stub

        this.iv = key.substring(0, 16);

        byte[] keyBytes = new byte[16];
        byte[] b = key.getBytes("UTF-8");
        int len = b.length;
        if (len > keyBytes.length)
            len = keyBytes.length;
        System.arraycopy(b, 0, keyBytes, 0, len);
        SecretKeySpec keySpec = new SecretKeySpec(keyBytes, "AES");

        this.keySpec = keySpec;
    }

    // 
    public String aesEncode(String str) throws java.io.UnsupportedEncodingException, NoSuchAlgorithmException,
            NoSuchPaddingException, InvalidKeyException, InvalidAlgorithmParameterException,
            IllegalBlockSizeException, BadPaddingException {
        Cipher c = Cipher.getInstance("AES/CBC/PKCS5Padding");
        c.init(Cipher.ENCRYPT_MODE, keySpec, new IvParameterSpec(iv.getBytes()));

        byte[] encrypted = c.doFinal(str.getBytes("UTF-8"));
        String enStr = new String(Base64.encodeBase64(encrypted));

        return enStr;
    }

    //
    public String aesDecode(String str) throws java.io.UnsupportedEncodingException, NoSuchAlgorithmException,
            NoSuchPaddingException, InvalidKeyException, InvalidAlgorithmParameterException,
            IllegalBlockSizeException, BadPaddingException {
        Cipher c = Cipher.getInstance("AES/CBC/PKCS5Padding");
        c.init(Cipher.DECRYPT_MODE, keySpec, new IvParameterSpec(iv.getBytes("UTF-8")));

        byte[] byteStr = Base64.decodeBase64(str.getBytes());

        return new String(c.doFinal(byteStr), "UTF-8");
    }
}