java encryption algorithm MD5 encryption and hash hash with secret key encryption algorithm source code

java encryption algorithm --MD5 encryption and hash hash with secret key encryption algorithm source code

Recently learned the knowledge of encryption algorithm, the use of MD5 encryption, baidu 1 under the Internet information is a lot of, not very detailed, here sorted out how to use MD5 encryption and hash hash with the secret key encryption algorithm, you can look at the next.

Implementation code:

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;

/**
*  using MD5 encryption  
* 
* @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 overweight   generate 32 position md5 code  
*/ 
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 encryption   generate 32 position md5 code  
*/ 
public static String stringMD5(String inStr){ 
return string2MD5(string2MD5(inStr)); 

}

/** 
*  Encryption and decryption algorithm 
*/ 
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();
//  The byte array is converted to  106 Into the system   The number 
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 "";
}
}

//  Test the main function  
public static void main(String args[]) throws Exception { 
// Hash hash with secret key encryption 
String tt = convertSHA1("123456");
System.out.println(tt);

//MD5 encryption 
String s = new String("123456"); 
System.out.println(" The original: " + s); 
System.out.println("MD5 After: " + string2MD5(s)); 
System.out.println("MD5 After the encryption: " + stringMD5(s));
} 
}

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