def MakeOCSPResponse(issuer_cn, issuer_key, serial, revoked):
# https://tools.ietf.org/html/rfc2560
issuer_name_hash = asn1.OCTETSTRING(
hashlib.sha1(asn1.ToDER(Name(cn=issuer_cn))).digest())
issuer_key_hash = asn1.OCTETSTRING(
hashlib.sha1(asn1.ToDER(issuer_key)).digest())
cert_status = None
if revoked:
cert_status = asn1.Explicit(1, asn1.GeneralizedTime("20100101060000Z"))
else:
cert_status = asn1.Raw(asn1.TagAndLength(0x80 | 0, 0))
basic_resp_data_der = asn1.ToDER(
asn1.SEQUENCE([
asn1.Explicit(2, issuer_key_hash),
asn1.GeneralizedTime("20100101060000Z"), # producedAt
asn1.SEQUENCE([
asn1.SEQUENCE([ # SingleResponse
asn1.SEQUENCE([ # CertID
asn1.SEQUENCE([ # hashAlgorithm
HASH_SHA1,
None,
]),
issuer_name_hash,
issuer_key_hash,
serial,
]),
cert_status,
asn1.GeneralizedTime("20100101060000Z"), # thisUpdate
asn1.Explicit(
0,
asn1.GeneralizedTime("20300101060000Z")), # nextUpdate
]),
]),
]))
basic_resp = asn1.SEQUENCE([
asn1.Raw(basic_resp_data_der),
asn1.SEQUENCE([
SHA1_WITH_RSA_ENCRYPTION,
None,
]),
asn1.BitString(issuer_key.Sign(basic_resp_data_der)),
])
resp = asn1.SEQUENCE([
asn1.ENUMERATED(0),
asn1.Explicit(
0,
asn1.SEQUENCE([
OCSP_TYPE_BASIC,
asn1.OCTETSTRING(asn1.ToDER(basic_resp)),
]))
])
return asn1.ToDER(resp)
def MakeOCSPSingleResponse(issuer_name_hash, issuer_key_hash, serial,
ocsp_state, ocsp_date):
cert_status = None
if ocsp_state == OCSP_STATE_REVOKED:
cert_status = asn1.Explicit(1, asn1.GeneralizedTime("20100101060000Z"))
elif ocsp_state == OCSP_STATE_UNKNOWN:
cert_status = asn1.Raw(asn1.TagAndLength(0x80 | 2, 0))
elif ocsp_state == OCSP_STATE_GOOD:
cert_status = asn1.Raw(asn1.TagAndLength(0x80 | 0, 0))
elif ocsp_state == OCSP_STATE_MISMATCHED_SERIAL:
cert_status = asn1.Raw(asn1.TagAndLength(0x80 | 0, 0))
serial -= 1
else:
raise ValueError('Bad OCSP state: ' + str(ocsp_state))
now = datetime.datetime.fromtimestamp(time.mktime(time.gmtime()))
if ocsp_date == OCSP_DATE_VALID:
thisUpdate = now - datetime.timedelta(days=1)
nextUpdate = thisUpdate + datetime.timedelta(weeks=1)
elif ocsp_date == OCSP_DATE_OLD:
thisUpdate = now - datetime.timedelta(days=1, weeks=1)
nextUpdate = thisUpdate + datetime.timedelta(weeks=1)
elif ocsp_date == OCSP_DATE_EARLY:
thisUpdate = now + datetime.timedelta(days=1)
nextUpdate = thisUpdate + datetime.timedelta(weeks=1)
elif ocsp_date == OCSP_DATE_LONG:
thisUpdate = now - datetime.timedelta(days=365)
nextUpdate = thisUpdate + datetime.timedelta(days=366)
elif ocsp_date == OCSP_DATE_LONGER:
thisUpdate = now - datetime.timedelta(days=367)
nextUpdate = thisUpdate + datetime.timedelta(days=368)
else:
raise ValueError('Bad OCSP date: ' + str(ocsp_date))
return asn1.SEQUENCE([ # SingleResponse
asn1.SEQUENCE([ # CertID
asn1.SEQUENCE([ # hashAlgorithm
HASH_SHA1,
None,
]),
issuer_name_hash,
issuer_key_hash,
serial,
]),
cert_status,
asn1.GeneralizedTime( # thisUpdate
thisUpdate.strftime(GENERALIZED_TIME_FORMAT)),
asn1.Explicit( # nextUpdate
0,
asn1.GeneralizedTime(
nextUpdate.strftime(GENERALIZED_TIME_FORMAT))),
])
def MakeOCSPResponse(issuer_cn, issuer_key, serial, ocsp_states, ocsp_dates,
ocsp_produced):
# https://tools.ietf.org/html/rfc2560
issuer_name_hash = asn1.OCTETSTRING(
hashlib.sha1(asn1.ToDER(Name(cn=issuer_cn))).digest())
issuer_key_hash = asn1.OCTETSTRING(
hashlib.sha1(asn1.ToDER(issuer_key)).digest())
now = datetime.datetime.fromtimestamp(time.mktime(time.gmtime()))
if ocsp_produced == OCSP_PRODUCED_VALID:
producedAt = now - datetime.timedelta(days=1)
elif ocsp_produced == OCSP_PRODUCED_BEFORE_CERT:
producedAt = datetime.datetime.strptime("19100101050000Z",
GENERALIZED_TIME_FORMAT)
elif ocsp_produced == OCSP_PRODUCED_AFTER_CERT:
producedAt = datetime.datetime.strptime("20321201070000Z",
GENERALIZED_TIME_FORMAT)
else:
raise ValueError('Bad OCSP produced: ' + str(ocsp_produced))
single_responses = [
MakeOCSPSingleResponse(issuer_name_hash, issuer_key_hash, serial,
ocsp_state, ocsp_date)
for ocsp_state, ocsp_date in itertools.izip(ocsp_states, ocsp_dates)
]
basic_resp_data_der = asn1.ToDER(
asn1.SEQUENCE([
asn1.Explicit(2, issuer_key_hash),
asn1.GeneralizedTime(producedAt.strftime(GENERALIZED_TIME_FORMAT)),
asn1.SEQUENCE(single_responses),
]))
basic_resp = asn1.SEQUENCE([
asn1.Raw(basic_resp_data_der),
asn1.SEQUENCE([
SHA256_WITH_RSA_ENCRYPTION,
None,
]),
asn1.BitString(issuer_key.Sign(basic_resp_data_der)),
])
resp = asn1.SEQUENCE([
asn1.ENUMERATED(0),
asn1.Explicit(
0,
asn1.SEQUENCE([
OCSP_TYPE_BASIC,
asn1.OCTETSTRING(asn1.ToDER(basic_resp)),
]))
])
return asn1.ToDER(resp)
