Java进行3DES加密解密详解编程语言

    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([email protected])  
     * @date 2015-8-18  
     */   
    public class ThreeDES {   
       
        private static final String Algorithm = "DESede"; // 定义 加密算法,可用   
                                                            // DES,DESede,Blowfish   
       
        /**  
         * 加密方法  
         *   
         * @param keybyte  
         *            加密密钥，长度为24字节  
         * @param src  
         *            被加密的数据缓冲区（源）  
         * @return  
         * @author SHANHY  
         * @date 2015-8-18  
         */   
        public static byte[] encryptMode(byte[] keybyte, byte[] src) {   
            try {   
                // 生成密钥   
                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  
         *            加密密钥，长度为24字节  
         * @param src  
         *            加密后的缓冲区  
         * @return  
         * @author SHANHY  
         * @date 2015-8-18  
         */   
        public static byte[] decryptMode(byte[] keybyte, byte[] src) {   
            try {   
                // 生成密钥   
                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;   
        }   
       
        /**  
         * 转换成十六进制字符串  
         *   
         * @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();   
        }   
       
        /**  
         * 测试  
         *   
         * @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就要把它添加进去   
            Security.addProvider(new com.sun.crypto.provider.SunJCE());   
       
            // 24字节的密钥（我们可以取apk签名的指纹的前12个byte和后12个byte拼接在一起为我们的密钥）   
            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. 测试";   
       
            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)));   
        }   
       
    }