def _handleCoveringKey(self, interest, data, timeSlot, onEncryptedKeys,
onError):
"""
This is called from an expressInterest OnData to check that the
encryption key contained in data fits the timeSlot. This sends a refined
interest if required.
:param Interest interest: The interest given to expressInterest.
:param Data data: The fetched Data packet.
:param float timeSlot: The time slot as milliseconds since Jan 1, 1970 UTC.
:param onEncryptedKeys: When there are no more interests to process,
this calls onEncryptedKeys(keys) where keys is a list of encrypted
content key Data packets. If onEncryptedKeys is None, this does not
use it.
:type onEncryptedKeys: function object
:param onError: This calls onError(errorCode, message) for an error.
:type onError: function object
"""
timeCount = round(timeSlot)
keyRequest = self._keyRequests[timeCount]
interestName = interest.getName()
keyName = data.getName()
begin = Schedule.fromIsoString(
str(keyName.get(Producer.START_TIME_STAMP_INDEX).getValue()))
end = Schedule.fromIsoString(
str(keyName.get(Producer.END_TIME_STAMP_INDEX).getValue()))
if timeSlot >= end:
# If the received E-KEY covers some earlier period, try to retrieve
# an E-KEY covering a later one.
timeRange = Exclude(interest.getExclude())
Producer.excludeBefore(
timeRange, keyName.get(Producer.START_TIME_STAMP_INDEX))
keyRequest.repeatAttempts[interestName] = 0
self._sendKeyInterest(
Interest(interestName).setExclude(timeRange).setChildSelector(
1), timeSlot, onEncryptedKeys, onError)
else:
# If the received E-KEY covers the content key, encrypt the content.
encryptionKey = data.getContent()
# If everything is correct, save the E-KEY as the current key.
if self._encryptContentKey(encryptionKey, keyName, timeSlot,
onEncryptedKeys, onError):
keyInfo = self._eKeyInfo[interestName]
keyInfo.beginTimeSlot = begin
keyInfo.endTimeSlot = end
keyInfo.keyBits = encryptionKey
def _handleCoveringKey(
self, interest, data, timeSlot, onEncryptedKeys, onError):
"""
This is called from an expressInterest OnData to check that the
encryption key contained in data fits the timeSlot. This sends a refined
interest if required.
:param Interest interest: The interest given to expressInterest.
:param Data data: The fetched Data packet.
:param float timeSlot: The time slot as milliseconds since Jan 1, 1970 UTC.
:param onEncryptedKeys: When there are no more interests to process,
this calls onEncryptedKeys(keys) where keys is a list of encrypted
content key Data packets. If onEncryptedKeys is None, this does not
use it.
:type onEncryptedKeys: function object
:param onError: This calls onError(errorCode, message) for an error.
:type onError: function object
"""
timeCount = round(timeSlot)
keyRequest = self._keyRequests[timeCount]
interestName = interest.getName()
keyName = data.getName()
begin = Schedule.fromIsoString(
str(keyName.get(Producer.START_TIME_STAMP_INDEX).getValue()))
end = Schedule.fromIsoString(
str(keyName.get(Producer.END_TIME_STAMP_INDEX).getValue()))
if timeSlot >= end:
# If the received E-KEY covers some earlier period, try to retrieve
# an E-KEY covering a later one.
timeRange = Exclude(interest.getExclude())
Producer.excludeBefore(timeRange, keyName.get(Producer.START_TIME_STAMP_INDEX))
keyRequest.repeatAttempts[interestName] = 0
self._sendKeyInterest(
Interest(interestName).setExclude(timeRange).setChildSelector(1),
timeSlot, onEncryptedKeys, onError)
else:
# If the received E-KEY covers the content key, encrypt the content.
encryptionKey = data.getContent()
# If everything is correct, save the E-KEY as the current key.
if self._encryptContentKey(
encryptionKey, keyName, timeSlot, onEncryptedKeys, onError):
keyInfo = self._eKeyInfo[interestName]
keyInfo.beginTimeSlot = begin
keyInfo.endTimeSlot = end
keyInfo.keyBits = encryptionKey
