【转】 java DES ECB模式对称加密解密

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！


原文地址：http://blog.csdn.net/springsky_/article/details/8086037

转载只留作自己学习，版权归作者所有！