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:
* :
*
*/
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 = “”;
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:
* :
*
*/
public final class ConvertUtil {
public final static char[] BToA = “0abcdef”.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) “0ABCDEF”.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！
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