最近需要又要使用DES加密数据，要求DES加密出来的数据为对称加密，经过研究，发现了一些问题：

1.DES对称ECB模式加密的数据，长度必须为8的倍数

2.加密的数据，加密后先转码(因为加密后的数据我是转码了)，否则解密是乱码格式

一下是源代码：

这个是加密的工具类：

package com.palmfu.sql;

import java.security.Key;

import javax.crypto.Cipher;

import javax.crypto.spec.SecretKeySpec;

/***

* DES ECB对称加密 解密

* @author spring sky

* Email:vipa1888@163.com

* QQ:840950105

*

*/

public class DesECBUtil {

/**

* 加密数据

* @param encryptString 注意：这里的数据长度只能为8的倍数

* @param encryptKey

* @return

* @throws Exception

*/

public static String encryptDES(String encryptString, String encryptKey) throws Exception {

SecretKeySpec key = new SecretKeySpec(getKey(encryptKey), "DES");

Cipher cipher = Cipher.getInstance("DES/ECB/NoPadding");

cipher.init(Cipher.ENCRYPT_MODE, key);

byte[] encryptedData = cipher.doFinal(encryptString.getBytes());

return ConvertUtil.bytesToHexString(encryptedData);

}

/**

* 自定义一个key

* @param string

*/

public static byte[] getKey(String keyRule) {

Key key = null;

byte[] keyByte = keyRule.getBytes();

// 创建一个空的八位数组,默认情况下为0

byte[] byteTemp = new byte[8];

// 将用户指定的规则转换成八位数组

for (int i = 0; i < byteTemp.length && i < keyByte.length; i++) {

byteTemp[i] = keyByte[i];

}

key = new SecretKeySpec(byteTemp, "DES");

return key.getEncoded();

}

/***

* 解密数据

* @param decryptString

* @param decryptKey

* @return

* @throws Exception

*/

public static String decryptDES(String decryptString, String decryptKey) throws Exception {

SecretKeySpec key = new SecretKeySpec(getKey(decryptKey), "DES");

Cipher cipher = Cipher.getInstance("DES/ECB/NoPadding");

cipher.init(Cipher.DECRYPT_MODE, key);

byte decryptedData[] = cipher.doFinal(ConvertUtil.hexStringToByte(decryptString));

return new String(decryptedData);

}

public static void main(String[] args) throws Exception {

String clearText = "springsk"; //这里的数据长度必须为8的倍数

String key = "12345678";

System.out.println("明文："+clearText+"\n密钥："+key);

String encryptText = encryptDES(clearText, key);

System.out.println("加密后："+encryptText);

String decryptText = decryptDES(encryptText, key);

System.out.println("解密后："+decryptText);

}

}

转码工具类(包含MD5加密)

package com.palmfu.sql;

import java.io.ByteArrayInputStream;

import java.io.ByteArrayOutputStream;

import java.io.IOException;

import java.io.ObjectInputStream;

import java.io.ObjectOutputStream;

import java.io.Serializable;

import java.security.MessageDigest;

import java.security.NoSuchAlgorithmException;

/***

* 转码 MD5工具类

* @author spring sky

* Email:vipa1888@163.com

* QQ:840950105

*

*/

public final class ConvertUtil {

public final static char[] BToA = "0123456789abcdef".toCharArray();

private ConvertUtil() {

}

/**

* 把16进制字符串转换成字节数组

*

* @param hex

* @return

*/

public static byte[] hexStringToByte(String hex) {

int len = (hex.length() / 2);

byte[] result = new byte[len];

char[] achar = hex.toCharArray();

for (int i = 0; i < len; i++) {

int pos = i * 2;

result[i] = (byte) (toByte(achar[pos]) << 4 | toByte(achar[pos + 1]));

}

return result;

}

private static byte toByte(char c) {

byte b = (byte) "0123456789ABCDEF".indexOf(c);

return b;

}

/**

* 把字节数组转换成16进制字符串

*

* @param bArray

* @return

*/

public static final String bytesToHexString(byte[] bArray) {

if(bArray == null )

{

return "";

}

StringBuffer sb = new StringBuffer(bArray.length);

String sTemp;

for (int i = 0; i < bArray.length; i++) {

sTemp = Integer.toHexString(0xFF & bArray[i]);

if (sTemp.length() < 2)

sb.append(0);

sb.append(sTemp.toUpperCase());

}

return sb.toString();

}

/**

* 把字节数组转换为对象

*

* @param bytes

* @return

* @throws IOException

* @throws ClassNotFoundException

*/

public static final Object bytesToObject(byte[] bytes) throws IOException,

ClassNotFoundException {

ByteArrayInputStream in = new ByteArrayInputStream(bytes);

ObjectInputStream oi = new ObjectInputStream(in);

Object o = oi.readObject();

oi.close();

return o;

}

/**

* 把可序列化对象转换成字节数组

*

* @param s

* @return

* @throws IOException

*/

public static final byte[] objectToBytes(Serializable s) throws IOException {

ByteArrayOutputStream out = new ByteArrayOutputStream();

ObjectOutputStream ot = new ObjectOutputStream(out);

ot.writeObject(s);

ot.flush();

ot.close();

return out.toByteArray();

}

public static final String objectToHexString(Serializable s)

throws IOException {

return bytesToHexString(objectToBytes(s));

}

public static final Object hexStringToObject(String hex)

throws IOException, ClassNotFoundException {

return bytesToObject(hexStringToByte(hex));

}

/**

* @函数功能: BCD码转为10进制串(阿拉伯数据)

* @输入参数: BCD码

* @输出结果: 10进制串

*/

public static String bcd2Str(byte[] bytes) {

StringBuffer temp = new StringBuffer(bytes.length * 2);

for (int i = 0; i < bytes.length; i++) {

temp.append((byte) ((bytes[i] & 0xf0) >>> 4));

temp.append((byte) (bytes[i] & 0x0f));

}

return temp.toString().substring(0, 1).equalsIgnoreCase("0") ? temp

.toString().substring(1) : temp.toString();

}

/**

* @函数功能: 10进制串转为BCD码

* @输入参数: 10进制串

* @输出结果: BCD码

*/

public static byte[] str2Bcd(String asc) {

int len = asc.length();

int mod = len % 2;

if (mod != 0) {

asc = "0" + asc;

len = asc.length();

}

byte abt[] = new byte[len];

if (len >= 2) {

len = len / 2;

}

byte bbt[] = new byte[len];

abt = asc.getBytes();

int j, k;

for (int p = 0; p < asc.length() / 2; p++) {

if ((abt[2 * p] >= '0') && (abt[2 * p] <= '9')) {

j = abt[2 * p] - '0';

} else if ((abt[2 * p] >= 'a') && (abt[2 * p] <= 'z')) {

j = abt[2 * p] - 'a' + 0x0a;

} else {

j = abt[2 * p] - 'A' + 0x0a;

}

if ((abt[2 * p + 1] >= '0') && (abt[2 * p + 1] <= '9')) {

k = abt[2 * p + 1] - '0';

} else if ((abt[2 * p + 1] >= 'a') && (abt[2 * p + 1] <= 'z')) {

k = abt[2 * p + 1] - 'a' + 0x0a;

} else {

k = abt[2 * p + 1] - 'A' + 0x0a;

}

int a = (j << 4) + k;

byte b = (byte) a;

bbt[p] = b;

}

return bbt;

}

public static String BCD2ASC(byte[] bytes) {

StringBuffer temp = new StringBuffer(bytes.length * 2);

for (int i = 0; i < bytes.length; i++) {

int h = ((bytes[i] & 0xf0) >>> 4);

int l = (bytes[i] & 0x0f);

temp.append(BToA[h]).append(BToA[l]);

}

return temp.toString();

}

/**

* 两字符数组异或

*/

public static byte[] byteArrXor(byte[] arr1, byte[] arr2, int len){

byte[] dest = new byte[len];

if((arr1.length < len) || (arr2.length < len)){

return null;

}

for(int i = 0;i < len;i++){

dest[i] = (byte)(arr1[i] ^ arr2[i]);

}

return dest;

}

/**

* MD5加密字符串，返回加密后的16进制字符串

* @param origin

* @return

*/

public static String MD5EncodeToHex(String origin) {

return bytesToHexString(MD5Encode(origin));

}

/**

* MD5加密字符串，返回加密后的字节数组

*

* @param origin

* @return

*/

public static byte[] MD5Encode(String origin) {

return MD5Encode(origin.getBytes());

}

/**

* MD5加密字节数组，返回加密后的字节数组

*

* @param bytes

* @return

*/

public static byte[] MD5Encode(byte[] bytes) {

MessageDigest md = null;

try {

md = MessageDigest.getInstance("MD5");

return md.digest(bytes);

} catch (NoSuchAlgorithmException e) {

e.printStackTrace();

return new byte[0];

}

}

}

以上DES 的ECB模式加密解密已经在android java平台测试，没有任何问题，而且已经和PHP后台互通了，请大家放心使用！如有问题，请联系我！

转载请保留spring sky 版权！