jwk.py 文件源码

def fields_from_json(cls, jobj):
        # pylint: disable=invalid-name
        n, e = (cls._decode_param(jobj[x]) for x in ('n', 'e'))
        public_numbers = rsa.RSAPublicNumbers(e=e, n=n)
        if 'd' not in jobj:  # public key
            key = public_numbers.public_key(default_backend())
        else:  # private key
            d = cls._decode_param(jobj['d'])
            if ('p' in jobj or 'q' in jobj or 'dp' in jobj or
                    'dq' in jobj or 'qi' in jobj or 'oth' in jobj):
                # "If the producer includes any of the other private
                # key parameters, then all of the others MUST be
                # present, with the exception of "oth", which MUST
                # only be present when more than two prime factors
                # were used."
                p, q, dp, dq, qi, = all_params = tuple(
                    jobj.get(x) for x in ('p', 'q', 'dp', 'dq', 'qi'))
                if tuple(param for param in all_params if param is None):
                    raise errors.Error(
                        'Some private parameters are missing: {0}'.format(
                            all_params))
                p, q, dp, dq, qi = tuple(
                    cls._decode_param(x) for x in all_params)

                # TODO: check for oth
            else:
                # cryptography>=0.8
                p, q = rsa.rsa_recover_prime_factors(n, e, d)
                dp = rsa.rsa_crt_dmp1(d, p)
                dq = rsa.rsa_crt_dmq1(d, q)
                qi = rsa.rsa_crt_iqmp(p, q)

            key = rsa.RSAPrivateNumbers(
                p, q, d, dp, dq, qi, public_numbers).private_key(
                    default_backend())

        return cls(key=key)