package com.ckms.utils;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
/**
*
* @ClassName UtryDES
* @Description JAVA版的DES加密解密
* @date 2012-7-31 下午10:51:30
*
*/
public class UtryDES {
public static void main(String args[]) {
String str1 = encrypt("utryckms", "100");
System.out.println(str1);
String str2 = decrypt("utryckms", str1);
System.out.println(str2);
str2 = decrypt("CCmsUTry", "50D753E49242EF2C");
System.out.println(str2);
}
/**
* 加密
* @param strKey
* @param strToEncrypt
* @return
*/
public static String encrypt(String strKey, String strToEncrypt) {
String result = "";
try {
// 设置为DES/ECB/PKCS5Padding的Cipher
// ECB对应.Net的CipherMode.ECB
// PKCS5Padding对应为.NET和JAVA的默认填充方式
DESKeySpec ks = new DESKeySpec(strKey.getBytes("UTF-8"));
SecretKeyFactory skf = SecretKeyFactory.getInstance("DES");
SecretKey sk = skf.generateSecret(ks);
Cipher cip = Cipher.getInstance("DES/ECB/PKCS5Padding");//Cipher.getInstance("DES");
// 设置为加密模式, 並设置解密的key
cip.init(Cipher.ENCRYPT_MODE, sk);
//考虑复杂字符所以加密时用UTF-8转换为byte[]
result = byteToHexStr(cip.doFinal(strToEncrypt.getBytes("UTF-8")));
} catch (Exception e) {
e.printStackTrace();
}
return result;
}
/** strKey 长度大于8 */
public static String decrypt(String strKey, String strToDecrypt) {
String result = "";
try {
// 建立解密所需的Key
DESKeySpec ks = new DESKeySpec(strKey.getBytes("UTF-8"));
SecretKeyFactory skf = SecretKeyFactory.getInstance("DES");
SecretKey sk = skf.generateSecret(ks);
// 设置为DES/ECB/PKCS5Padding的Cipher
// ECB对应.Net的CipherMode.ECB
// PKCS5Padding对应为.NET和JAVA的默认填充方式
Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
// 设置为解密模式, 並设置解密的key
cipher.init(Cipher.DECRYPT_MODE, sk);
// 输出解密后的字串. 考虑复杂字符所以加密时用UTF-8转换为byte[], 解密时用UTF-8转换回去
// 考虑加密时可能有字符补位，String的trim()将这些空字符刪掉
result = new String(cipher.doFinal(hexStr2Byte(strToDecrypt)), "UTF-8").trim();
} catch (Exception e) {
e.printStackTrace();
}
return result;
}
/**将16进制转换为二进制
* @param hexStr
* @return
*/
public static byte[] hexStr2Byte(String hexStr) {
if (hexStr.length() < 1)
return null;
byte[] result = new byte[hexStr.length()/2];
for (int i = 0;i< hexStr.length()/2; i++) {
//对应VB方法中的2位分段格式转换
int hex = Integer.parseInt(hexStr.substring(i*2, i*2+2), 16);
result[i] = (byte) (hex);
}
return result;
}
/**
* 将二进制 转换为16进制
* @param byteStr
* @return
*/
public static String byteToHexStr(byte[] byteStr) {
String str = "";
for(int i=0;i<byteStr.length ; i++) {
//考虑VB中的byte与JAVA中的byte取值范围差异，这里需要进行转换
String hex = Integer.toHexString(byteStr[i] & 0xFF);
if (hex.length() == 1) {
hex = '0' + hex;
}
str += hex;
}
return str.toUpperCase();
}
}
