hashCode of the APK signature

I need to return a single hashCode of the apk signature.

Signature[] sigs = context.getPackageManager().getPackageInfo(context.getPackageName(), PackageManager.GET_SIGNATURES).signatures;
for (Signature sig : sigs)
{
    Trace.i("MyApp", "Signature hashcode : " + sig.hashCode());
}

Does anyone know if it is possible to bring the hashCode of the apk signature that is unique?