show hash for facebook sdk

Util.java

public class Util{
  
public void printHashKey(Context context) {

    	try {
  			PackageInfo info = context.getPackageManager().getPackageInfo(
  					"com.clickdelivery.android.redwings",
  					PackageManager.GET_SIGNATURES);
  			for (Signature signature : info.signatures) {
  				MessageDigest md = MessageDigest.getInstance("SHA");
  				md.update(signature.toByteArray());
  				Log.d("TEMPTAGHASH:",
  						Base64.encodeToString(md.digest(), Base64.DEFAULT));
  			}
  		} catch (NameNotFoundException e) {
  			e.printStackTrace();
  
  		} catch (NoSuchAlgorithmException e) {
  			e.printStackTrace();
  		}
  	}
  
	}