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[Java教程]java加密算法


package com.ompa.common.utils;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

import javax.crypto.Mac;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;

/**
* 采用MD5加密
*
* @author zhangcd
* @date 2016-4-29
*/
public class EncryptUtil {

private static final String MAC_NAME = "HmacSHA1";
private static final String ENCODING = "UTF-8";
private static final String key = "iloveyou";

/***
* MD5加码 生成32位md5码
*/
public static String string2MD5(String inStr){
MessageDigest md5 = null;
try{
md5 = MessageDigest.getInstance("MD5");
}catch (Exception e){
System.out.println(e.toString());
e.printStackTrace();
return "";
}
char[] charArray = inStr.toCharArray();
byte[] byteArray = new byte[charArray.length];

for (int i = 0; i < charArray.length; i++)
byteArray[i] = (byte) charArray[i];
byte[] md5Bytes = md5.digest(byteArray);
StringBuffer hexValue = new StringBuffer();
for (int i = 0; i < md5Bytes.length; i++){
int val = ((int) md5Bytes[i]) & 0xff;
if (val < 16)
hexValue.append("0");
hexValue.append(Integer.toHexString(val));
}
return hexValue.toString();

}

/***
* MD5加密 生成32位md5码
*/
public static String stringMD5(String inStr){
return string2MD5(string2MD5(inStr));

}

/**
* 加密解密算法
*/
public static String convertMD5(String inStr){

char[] a = inStr.toCharArray();
for (int i = 0; i < a.length; i++){
a[i] = (char) (a[i] ^ 't');
}
String s = new String(a);
return s;

}

/**
* HMAC-SHA1
* @param encryptText
* @param encryptKey
* @return
* @throws Exception
*/
public static String HmacSHA1Encrypt(String encryptText, String encryptKey) throws Exception
{
byte[] data=encryptKey.getBytes(ENCODING);
SecretKey secretKey = new SecretKeySpec(data, MAC_NAME);
Mac mac = Mac.getInstance(MAC_NAME);
mac.init(secretKey);

byte[] text = encryptText.getBytes(ENCODING);
byte[] str = mac.doFinal(text);
// Create Hex String
StringBuffer hexString = new StringBuffer();
// 字节数组转换为 十六进制 数
for (int i = 0; i < str.length; i++) {
String shaHex = Integer.toHexString(str[i] & 0xFF);
if (shaHex.length() < 2) {
hexString.append(0);
}
hexString.append(shaHex);
}
return hexString.toString();
}

public static String convertSHA1(String instr){
try {
return HmacSHA1Encrypt(instr,key);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
return "";
}
}

// 测试主函数
public static void main(String args[]) throws Exception {
//哈希散列带秘钥加密
String tt = convertSHA1("123456");
System.out.println(tt);

//MD5加密
String s = new String("123456");
System.out.println("原始:" + s);
System.out.println("MD5后:" + string2MD5(s));
System.out.println("MD5加密后:" + stringMD5(s));
}
}