This is an example of how to encrypt and decrypt using a salt. The salt is random data very often used in cryptography as additional input to a hash function. Doing encryption and decryption of a String with a salt implies that you should:

• Read an initial String.
• Generate random bytes to be placed in the salt.
• Create asun.misc.BASE64Decoder (a Utility Class to encode a String or ByteArray as a Base64 encoded String) and a byte array to be used as a salt.
• Use theBASE64Encoder to encode both the salt and the String and return them, as described in theencrypt(String str) method.
• Read the encrypted String.
• Create asun.misc.BASE64Encoder (A utility class to decode a Base64 encoded String to a ByteArray) to decode the String to a byte array.
• Return the String representation of the byte array, as shown in thedecrypt(String encstr) method.

Let’s take a look at the code snippet that follows:

package com.javacodegeeks.snippets.core;import java.io.IOException;import java.util.Date;import java.util.Random;import sun.misc.BASE64Decoder;import sun.misc.BASE64Encoder;public class Main {    private static Random rand = new Random((new Date()).getTime());    public static void main(String[] args) throws Exception {  String st = "secrete";  String enc = encrypt(st);  System.out.println("Encrypted string :" + enc);  System.out.println("Decrypted string :" + decrypt(enc));    }    public static String encrypt(String str) {  BASE64Encoder encoder = new BASE64Encoder();  byte[] salt = new byte[8];  rand.nextBytes(salt);  return encoder.encode(salt) + encoder.encode(str.getBytes());    }    public static String decrypt(String encstr) {  if (encstr.length() > 12) {String cipher = encstr.substring(12);BASE64Decoder decoder = new BASE64Decoder();try {    return new String(decoder.decodeBuffer(cipher));} catch (IOException e) {    //  throw new InvalidImplementationException(    //Fail}  }  return null;    }}

Output:

Encrypted string :CT6/c+0AAmU=c2VjcmV0ZQ== Decrypted string :secrete

 
This was an example of how to encrypt and decrypt using a salt in Java.

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