def sstate_sign_package(d):
    from oe.gpg_sign import get_signer

    if d.getVar('SSTATE_SIG_KEY'):
        signer = get_signer(d, 'local')
        sstate_pkg = d.getVar('SSTATE_PKG')
        if os.path.exists(sstate_pkg + '.sig'):
            os.unlink(sstate_pkg + '.sig')
        signer.detach_sign(sstate_pkg, d.getVar('SSTATE_SIG_KEY', False), None,
                           d.getVar('SSTATE_SIG_PASSPHRASE'), armor=False)

sstate_sign_package(d)