sha256.java

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.io.UnsupportedEncodingException;
import java.security.*;

public class HelloWorld{

     public static void main(String []args) 
     throws UnsupportedEncodingException, NoSuchAlgorithmException {
        String digest = hash256("ef591fbbc527d77402d9a10dba92c195|approve-developer|developer@example.com|developer@example.com|2014-01-01T00:00:00+00:00");
        System.out.println(digest);
     }
    public static String hash256(String data) throws NoSuchAlgorithmException {
        MessageDigest md = MessageDigest.getInstance("SHA-256");
        md.update(data.getBytes());
        return bytesToHex(md.digest());
    }
    public static String bytesToHex(byte[] bytes) {
        StringBuffer result = new StringBuffer();
        for (byte byt : bytes) result.append(Integer.toString((byt & 0xff) + 0x100, 16).substring(1));
        return result.toString();
    }
}