from M2Crypto import X509

def verify_data(data, signature, cert):
    rawsig = signature..decode('base64') 

    x509 = X509.load_cert_string(cert)
    pubkey = x509.get_pubkey()
    pubkey.reset_context(md='sha256')
    pubkey.verify_init()
    pubkey.verify_update(data)
    return pubkey.verify_final(rawsig)