Message Digests in Android

Overview

Message Digests are one way hash functions that take arbitrary-sized data and returns fixed-length hash value.

Steps to use Message Digests

 public static String encryptString(String data) {
    String salt = "iamraajkanchan";
    String output;
    try {
        //Create Byte valiable
        byte[] dataByte;
        data = data + salt;
        dataByte = data.getBytes("UTF-8");

        //Define hash algorithm
        MessageDigest messageDigest = MessageDigest.getInstance("SHA-256");

        //Hashed given pain-text
        dataByte = messageDigest.digest(dataByte);

        // return the hash as a base 64 encoded string
        output = Base64.encodeToString(dataByte, Base64.NO_WRAP);

        return output;
    } catch (Exception e) {
        e.printStackTrace();
        return null;
    }
 }

Reference

1. https://developer.android.com/reference/java/security/MessageDigest