java is a simple example of MD5 encryption algorithm

java is a simple example of MD5 encryption algorithm

Implementation code:

import java.security.NoSuchAlgorithmException;  
 
public class MD5HashUtil  
{  
private MessageDigest md = null;  
private static MD5HashUtil md5 = null;  
private static final char[] hexChars ={'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};  
 
  /** 
  * Constructor is private so you must use the getInstance method 
  */  
  private MD5HashUtil() throws NoSuchAlgorithmException  
  {  
   md = MessageDigest.getInstance("MD5");  
  }  
  /** 
  * This returns the singleton instance 
  */  
 public static MD5HashUtil getInstance()throws NoSuchAlgorithmException  
  {  
    if (md5 == null)  
    {  
     md5 = new MD5HashUtil();  
   }  
   return (md5);  
  }  
 public static String hashCode(String dataToHash) throws NoSuchAlgorithmException{  
 return getInstance().hashData(dataToHash.getBytes());  
 }  
 public static String hashCode(byte[] dataToHash) throws NoSuchAlgorithmException{  
 return getInstance().hashData(dataToHash);  
 }  
public String hashData(byte[] dataToHash) {  
   return hexStringFromBytes((calculateHash(dataToHash))).toLowerCase();  
}  
private byte[] calculateHash(byte[] dataToHash)  
{  
   md.update(dataToHash, 0, dataToHash.length);  
   return (md.digest());  
 }  
public String hexStringFromBytes(byte[] b)  
{  
  String hex = "";  
  int msb;  
  int lsb = 0;  
  int i;  
  // MSB maps to idx 0  
  for (i = 0; i < b.length; i++)  
  {  
   msb = ((int)b[i] & 0x000000FF) / 16;  
   lsb = ((int)b[i] & 0x000000FF) % 16;  
    hex = hex + hexChars[msb] + hexChars[lsb];  
   }  
   return(hex);  
  }  
 
public static void main(String args[]) throws NoSuchAlgorithmException  
{  
String string = "my name is zhangli";  
System.out.println(string);  
System.out.println(hashCode(string));  
}  
}  

Above code for java language md5 encryption algorithm, output encryption ciphertext!

The encrypted ciphertext is usually stored in the database, and if you need to compare only their encrypted ciphertext with md5.

At the same time, md5 encryption algorithm is irreversible, very difficult to crack.

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