backend.py 文件源码

def _encode_certificate_policies(backend, certificate_policies):
    cp = backend._lib.sk_POLICYINFO_new_null()
    backend.openssl_assert(cp != backend._ffi.NULL)
    cp = backend._ffi.gc(cp, backend._lib.sk_POLICYINFO_free)
    for policy_info in certificate_policies:
        pi = backend._lib.POLICYINFO_new()
        backend.openssl_assert(pi != backend._ffi.NULL)
        res = backend._lib.sk_POLICYINFO_push(cp, pi)
        backend.openssl_assert(res >= 1)
        oid = _txt2obj(backend, policy_info.policy_identifier.dotted_string)
        pi.policyid = oid
        if policy_info.policy_qualifiers:
            pqis = backend._lib.sk_POLICYQUALINFO_new_null()
            backend.openssl_assert(pqis != backend._ffi.NULL)
            for qualifier in policy_info.policy_qualifiers:
                pqi = backend._lib.POLICYQUALINFO_new()
                backend.openssl_assert(pqi != backend._ffi.NULL)
                res = backend._lib.sk_POLICYQUALINFO_push(pqis, pqi)
                backend.openssl_assert(res >= 1)
                if isinstance(qualifier, six.text_type):
                    pqi.pqualid = _txt2obj(
                        backend, x509.OID_CPS_QUALIFIER.dotted_string
                    )
                    pqi.d.cpsuri = _encode_asn1_str(
                        backend,
                        qualifier.encode("ascii"),
                        len(qualifier.encode("ascii"))
                    )
                else:
                    assert isinstance(qualifier, x509.UserNotice)
                    pqi.pqualid = _txt2obj(
                        backend, x509.OID_CPS_USER_NOTICE.dotted_string
                    )
                    un = backend._lib.USERNOTICE_new()
                    backend.openssl_assert(un != backend._ffi.NULL)
                    pqi.d.usernotice = un
                    if qualifier.explicit_text:
                        un.exptext = _encode_asn1_utf8_str(
                            backend, qualifier.explicit_text
                        )

                    un.noticeref = _encode_notice_reference(
                        backend, qualifier.notice_reference
                    )

            pi.qualifiers = pqis

    pp = backend._ffi.new('unsigned char **')
    r = backend._lib.i2d_CERTIFICATEPOLICIES(cp, pp)
    backend.openssl_assert(r > 0)
    pp = backend._ffi.gc(
        pp, lambda pointer: backend._lib.OPENSSL_free(pointer[0])
    )
    return pp, r