java加密算法--MD5加密和哈希散列带秘钥加密算法源码

java加密算法--md5加密和哈希散列带秘钥加密算法源码

             最近学习加密算法的知识，利用md5 加密，百度一下网上资料很多，不是很详细，这里就整理下如何实现用md5加密和 哈希散列带秘钥加密算法，大家可以看下。

实现代码：

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));
} 
}

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