APK signature hashcode

Question

I need returns a unique hashcode from 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());
}

I conclude that this code returns the hashcode of the signature of . jks, so all apk that use the same . jks will return the same hashcode, but I needed the unique hashcode of apk.

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