Generate Hash of Application Signature in Android

Signature.java

import java.security.MessageDigest;

import android.content.Context;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.Signature;
import android.util.Base64;

class Signature {
 
    public static String hash(Context context) {
        return hash(context, context.getPackageName());
    }
     
    public static String hash(Context context, String packag) {
        try {
            PackageInfo info = context.getPackageManager().getPackageInfo(packag, PackageManager.GET_SIGNATURES);
            Signature signature = info.signatures[0];
            MessageDigest digest = MessageDigest.getInstance("SHA");
            digest.update(signature.toByteArray());
            return Base64.encodeToString(digest.digest(), Base64.DEFAULT);
        } catch (Exception exception) {
            exception.printStackTrace();
            return null;
        }
    }
 
}