def verify(jwsjs):
    """Return (decoded headers, payload) if all signatures in jwsjs are
    consistent, else raise ValueError.
    
    Caller must decide whether the keys are actually trusted."""
    get_ed25519ll()    
    # XXX forbid duplicate keys in JSON input using object_pairs_hook (2.7+)
    recipients = jwsjs["recipients"]
    encoded_payload = binary(jwsjs["payload"])
    headers = []
    for recipient in recipients:
        assertTrue(len(recipient) == 2, "Unknown recipient key {0}".format(recipient))
        h = binary(recipient["header"])
        s = binary(recipient["signature"])
        header = json.loads(native(urlsafe_b64decode(h)))
        assertTrue(header["alg"] == ALG, 
                "Unexpected algorithm {0}".format(header["alg"]))
        if "alg" in header["jwk"] and not "kty" in header["jwk"]:
            header["jwk"]["kty"] = header["jwk"]["alg"] # b/w for JWK < -08
        assertTrue(header["jwk"]["kty"] == ALG, # true for Ed25519
                "Unexpected key type {0}".format(header["jwk"]["kty"]))
        vk = urlsafe_b64decode(binary(header["jwk"]["vk"]))
        secured_input = b".".join((h, encoded_payload))
        sig = urlsafe_b64decode(s)
        sig_msg = sig+secured_input
        verified_input = native(ed25519ll.crypto_sign_open(sig_msg, vk))
        verified_header, verified_payload = verified_input.split('.')
        verified_header = binary(verified_header)
        decoded_header = native(urlsafe_b64decode(verified_header))
        headers.append(json.loads(decoded_header))

    verified_payload = binary(verified_payload)

    # only return header, payload that have passed through the crypto library.
    payload = json.loads(native(urlsafe_b64decode(verified_payload)))

    return headers, payload
dataset/ETHPy150Open chalasr/Flask-P2P/venv/lib/python2.7/site-packages/wheel/signatures/__init__.py/verify/original