docencoder.java

本软件使用Java语言提供的JavaMail包进行开发

package com.lanx.app.security.base64;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import javax.crypto.spec.IvParameterSpec;

import sun.misc.BASE64Encoder;

/**
 * <p>加密类</p>
 * 
 * @author Ramboo Lan
 * @version 0.5
 * @Date: 2006-06-09
 */
public class DocEncoder extends AbstractDocCoder {
    public DocEncoder() {
        super();
    }

	/**
	 * 对字符串或者文件进行加密处理
	 * 
	 * @param str        需要加密的字符串或者文件路径
	 * */
    public String encode(String str) throws Exception  {
    	byte[] sorData = str.getBytes();      

        byte[] retByte = encodeByteData(sorData);
        BASE64Encoder base64 = new BASE64Encoder();

        return base64.encode(retByte);
    }
    
    /**
     * Encrypt a byte array
     * 
     * @param sourceData byte[]
     * @return byte[]
     * @throws Exception 
     */
    private byte[] encodeByteData(byte[] sourceData) throws Exception  {
        // Create SecretKey object
        byte[] encryptionByte = encryptionString.getBytes();
        DESKeySpec dks = new DESKeySpec(encryptionByte);
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
        SecretKey securekey = keyFactory.generateSecret(dks);

        // Create IvParameterSpec object with initialization vector
        IvParameterSpec spec=new IvParameterSpec(encryptionIV);
        Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
        cipher.init(Cipher.ENCRYPT_MODE, securekey, spec);

        return cipher.doFinal(sourceData);
    }
}