Java進行3DES加密解密

    package com.shanhy.tools.packers;


import java.security.Security;  

import javax.crypto.Cipher;  
import javax.crypto.SecretKey;  
import javax.crypto.spec.SecretKeySpec;  

/** 
 * 3DES加密 
 *  
 * @author SHANHY(365384722@QQ.COM) 
 * @date 2015-8-18 
 */  
public class ThreeDES {  

    private static final String Algorithm = "DESede"; // 定義 加密算法,可用  
                                                        // DES,DESede,Blowfish  

    /** 
     * 加密方法 
     *  
     * @param keybyte 
     *            加密密鑰，長度為24字節 
     * @param src 
     *            被加密的數據緩沖區（源） 
     * @return 
     * @author SHANHY 
     * @date 2015-8-18 
     */  
    public static byte[] encryptMode(byte[] keybyte, byte[] src) {  
        try {  
            // 生成密鑰  
            SecretKey deskey = new SecretKeySpec(keybyte, Algorithm);  

            // 加密  
            Cipher c1 = Cipher.getInstance(Algorithm);  
            c1.init(Cipher.ENCRYPT_MODE, deskey);  
            return c1.doFinal(src);  
        } catch (java.security.NoSuchAlgorithmException e1) {  
            e1.printStackTrace();  
        } catch (javax.crypto.NoSuchPaddingException e2) {  
            e2.printStackTrace();  
        } catch (java.lang.Exception e3) {  
            e3.printStackTrace();  
        }  
        return null;  
    }  

    /** 
     * 解密 
     *  
     * @param keybyte 
     *            加密密鑰，長度為24字節 
     * @param src 
     *            加密后的緩沖區 
     * @return 
     * @author SHANHY 
     * @date 2015-8-18 
     */  
    public static byte[] decryptMode(byte[] keybyte, byte[] src) {  
        try {  
            // 生成密鑰  
            SecretKey deskey = new SecretKeySpec(keybyte, Algorithm);  

            // 解密  
            Cipher c1 = Cipher.getInstance(Algorithm);  
            c1.init(Cipher.DECRYPT_MODE, deskey);  
            return c1.doFinal(src);  
        } catch (java.security.NoSuchAlgorithmException e1) {  
            e1.printStackTrace();  
        } catch (javax.crypto.NoSuchPaddingException e2) {  
            e2.printStackTrace();  
        } catch (java.lang.Exception e3) {  
            e3.printStackTrace();  
        }  
        return null;  
    }  

    /** 
     * 轉換成十六進制字符串 
     *  
     * @param b 
     * @return 
     * @author SHANHY 
     * @date 2015-8-18 
     */  
    public static String byte2hex(byte[] b) {  
        String hs = "";  
        String stmp = "";  

        for (int n = 0; n < b.length; n++) {  
            stmp = (java.lang.Integer.toHexString(b[n] & 0XFF));  
            if (stmp.length() == 1)  
                hs = hs + "0" + stmp;  
            else  
                hs = hs + stmp;  
            if (n < b.length - 1)  
                hs = hs + ":";  
        }  
        return hs.toUpperCase();  
    }  

    /** 
     * 測試 
     *  
     * @param args 
     * @author SHANHY 
     * @date 2015-8-18 
     */  
    public static void main(String[] args) {  
        // 添加新安全算法,如果用JCE就要把它添加進去  
        Security.addProvider(new com.sun.crypto.provider.SunJCE());  

        // 24字節的密鑰（我們可以取apk簽名的指紋的前12個byte和后12個byte拼接在一起為我們的密鑰）  
        final byte[] keyBytes = { 0x11, 0x22, 0x4F, 0x58, (byte) 0x88, 0x10, 0x40, 0x38, 0x28, 0x25, 0x79, 0x51, (byte) 0xCB, (byte) 0xDD, 0x55, 0x66, 0x77, 0x29, 0x74, (byte) 0x98, 0x30, 0x40, 0x36, (byte) 0xE2 };  
        String szSrc = "This is a 3DES test. 測試";  

        System.out.println("加密前的字符串:" + szSrc);  

        byte[] encoded = encryptMode(keyBytes, szSrc.getBytes());  
        System.out.println("加密后的字符串:" + new String(encoded));  

        byte[] srcBytes = decryptMode(keyBytes, encoded);  
        System.out.println("解密后的字符串:" + (new String(srcBytes)));  
    }  

}  </pre>