import rsa
def server_twokey():
    pubkey, privkey = rsa.newkeys(1024)
    pub = pubkey.save_pkcs1()
    pri = privkey.save_pkcs1("PEM")
    with open("./Bpubkey.pem", mode="wb") as f, open("./Bprivkey.pem", mode="wb") as f1:
        f.write(pub)
        f1.write(pri)