com.AES256Util.java Source code

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Here is the source code for com.AES256Util.java

Source

package com;

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;

/*
    
Copyright 2015   
    
Licensed under the Apache License, Version 2.0 (the "License");
    
you may not use this file except in compliance with the License.
    
You may obtain a copy of the License at
    
http://www.apache.org/licenses/LICENSE-2.0
    
Unless required by applicable law or agreed to in writing, software
    
distributed under the License is distributed on an "AS IS" BASIS,
    
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    
See the License for the specific language governing permissions and
    
limitations under the License.
    
 */

public class AES256Util {

    private String iv;

    private Key keySpec;

    public AES256Util(String key) throws UnsupportedEncodingException {

        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");

    }

    public static AES256Util createAES256() throws UnsupportedEncodingException {
        String key = "databaseprogramming"; //key databaseprogramming
        AES256Util aes256 = new AES256Util(key);
        return aes256;
    }

}