ResponseGenerator.java

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

import org.apache.commons.codec.binary.Base64;

public class ResponseGenerator {

	public static String toResponseKey(String clientKey) {
		try {
			String guid = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
			MessageDigest md = MessageDigest.getInstance("SHA-1");

			byte[] encrypted = md.digest((clientKey + guid).getBytes());
			byte[] encoded = new Base64().encode(encrypted);

			return new String(encoded);
		} catch (Exception e) {
			e.printStackTrace();
		}
		return null;
	}

	public static void main(String[] args) throws NoSuchAlgorithmException {
		String clientKey = "dGhlIHNhbXBsZSBub25jZQ==";
//		String guid = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
//		MessageDigest md = MessageDigest.getInstance("SHA-1");
//
//		byte[] encrypted = md.digest((clientKey + guid).getBytes());
//		byte[] encoded = new Base64().encode(encrypted);
//
//		System.out.println(new String(encoded));

		System.out.println(toResponseKey(clientKey));;
	}

}