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:[e-mail] * 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0byte[] 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:[e-mail] * 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！
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