__init__.py 文件源码

def sign(payload, keypair):
    """Return a JWS-JS format signature given a JSON-serializable payload and 
    an Ed25519 keypair."""
    get_ed25519ll()
    #
    header = {
                "alg": ALG,
                "jwk": {
                    "kty": ALG, # alg -> kty in jwk-08.
                    "vk": native(urlsafe_b64encode(keypair.vk))
                }
             }

    encoded_header = urlsafe_b64encode(binary(json.dumps(header, sort_keys=True)))
    encoded_payload = urlsafe_b64encode(binary(json.dumps(payload, sort_keys=True)))
    secured_input = b".".join((encoded_header, encoded_payload))
    sig_msg = ed25519ll.crypto_sign(secured_input, keypair.sk)
    signature = sig_msg[:ed25519ll.SIGNATUREBYTES]
    encoded_signature = urlsafe_b64encode(signature)

    return {"recipients": 
            [{"header":native(encoded_header),
             "signature":native(encoded_signature)}],
            "payload": native(encoded_payload)}