Python Name.getSubName方法代码示例

# 需要导入模块: from pyndn import Name [as 别名]
# 或者: from pyndn.Name import getSubName [as 别名]
    def test_subname(self):        
        name = Name("/edu/cmu/andrew/user/3498478")
        subName1 = name.getSubName(0)
        self.assertTrue(subName1.equals(name), 'Subname from first component does not match original name')
        subName2 = name.getSubName(3)
        self.assertEqual(subName2.toUri(), "/user/3498478")

        subName3 = name.getSubName(1,3)
        self.assertEqual(subName3.toUri(), "/cmu/andrew/user")

        subName4 = name.getSubName(0,100)
        self.assertTrue(name.equals(subName4), 'Subname with more components than original should stop at end of original name')

        subName5 = name.getSubName(7,9)
        self.assertTrue(Name().equals(subName5), 'Subname beginning after end of name should be empty')

# 需要导入模块: from pyndn import Name [as 别名]
# 或者: from pyndn.Name import getSubName [as 别名]
def benchmarkDecodeDataSeconds(nIterations, useCrypto, encoding):
    """
    Loop to decode a data packet nIterations times.

    :param int nIterations: The number of iterations.
    :param bool useCrypto: If true, verify the signature.  If false, don't
      verify.
    :param Blob encoding: The wire encoding to decode.
    """
    # Initialize the private key storage in case useCrypto is true.
    identityStorage = MemoryIdentityStorage()
    privateKeyStorage = MemoryPrivateKeyStorage()
    keyChain = KeyChain(IdentityManager(identityStorage, privateKeyStorage),
                        SelfVerifyPolicyManager(identityStorage))
    keyName = Name("/testname/DSK-123")
    certificateName = keyName.getSubName(0, keyName.size() - 1).append(
      "KEY").append(keyName[-1]).append("ID-CERT").append("0")
    identityStorage.addKey(keyName, KeyType.RSA, Blob(DEFAULT_RSA_PUBLIC_KEY_DER))

    start = getNowSeconds()
    for i in range(nIterations):
        data = Data()
        data.wireDecode(encoding)

        if useCrypto:
            keyChain.verifyData(data, onVerified, onVerifyFailed)

    finish = getNowSeconds()

    return finish - start

# 需要导入模块: from pyndn import Name [as 别名]
# 或者: from pyndn.Name import getSubName [as 别名]
def main():
    # The default Face will connect using a Unix socket, or to "localhost".
    face = Face()

    identityStorage = MemoryIdentityStorage()
    privateKeyStorage = MemoryPrivateKeyStorage()
    keyChain = KeyChain(
      IdentityManager(identityStorage, privateKeyStorage), None)
    keyChain.setFace(face)

    # Initialize the storage.
    keyName = Name("/testname/DSK-123")
    certificateName = keyName.getSubName(0, keyName.size() - 1).append(
      "KEY").append(keyName[-1]).append("ID-CERT").append("0")
    identityStorage.addKey(keyName, KeyType.RSA, Blob(DEFAULT_RSA_PUBLIC_KEY_DER))
    privateKeyStorage.setKeyPairForKeyName(
      keyName, KeyType.RSA, DEFAULT_RSA_PUBLIC_KEY_DER, DEFAULT_RSA_PRIVATE_KEY_DER)

    echo = Echo(keyChain, certificateName)
    prefix = Name("/testecho")
    dump("Register prefix", prefix.toUri())
    face.registerPrefix(prefix, echo.onInterest, echo.onRegisterFailed)

    while echo._responseCount < 1:
        face.processEvents()
        # We need to sleep for a few milliseconds so we don't use 100% of the CPU.
        time.sleep(0.01)    

    face.shutdown()

# 需要导入模块: from pyndn import Name [as 别名]
# 或者: from pyndn.Name import getSubName [as 别名]
    def wrap_content(self, name, content, key=None, key_locator=None):
        """
        @param name - name of the data
        @param content - data to be wrapped
        @param key - key used to sign the data
        @return the content object created
        wraps the given name and content into a content object
        """
        co = Data(Name(name))
        co.setContent(content)
        co.getMetaInfo().setFreshnessPeriod(5000)
        co.getMetaInfo().setFinalBlockID(Name("/%00%09")[0])

        identityStorage = MemoryIdentityStorage()
        privateKeyStorage = MemoryPrivateKeyStorage()
        identityManager = IdentityManager(identityStorage, privateKeyStorage)
        keyChain = KeyChain(identityManager, None)

        # Initialize the storage.
        keyName = Name("/ndn/bms/DSK-default")
        certificateName = keyName.getSubName(0, keyName.size() - 1).append(
                "KEY").append(keyName[-1]).append("ID-CERT").append("0")
        identityStorage.addKey(keyName, KeyType.RSA, Blob(DEFAULT_PUBLIC_KEY_DER))
        privateKeyStorage.setKeyPairForKeyName(keyName, DEFAULT_PUBLIC_KEY_DER, 
                DEFAULT_PRIVATE_KEY_DER)

        keyChain.sign(co, certificateName)

        _data = co.wireEncode()

        return _data.toRawStr()

# 需要导入模块: from pyndn import Name [as 别名]
# 或者: from pyndn.Name import getSubName [as 别名]
def main():
    face = Face("localhost")

    identityStorage = MemoryIdentityStorage()
    privateKeyStorage = MemoryPrivateKeyStorage()
    keyChain = KeyChain(
      IdentityManager(identityStorage, privateKeyStorage), None)
    keyChain.setFace(face)

    # Initialize the storage.
    keyName = Name("/testname/DSK-reposerver")
    certificateName = keyName.getSubName(0, keyName.size() - 1).append(
      "KEY").append(keyName[-1]).append("ID-CERT").append("0")
    identityStorage.addKey(keyName, KeyType.RSA, Blob(DEFAULT_PUBLIC_KEY_DER))
    privateKeyStorage.setKeyPairForKeyName(
      keyName, DEFAULT_PUBLIC_KEY_DER, DEFAULT_PRIVATE_KEY_DER)

    echo = RepoServer(keyChain, certificateName)
    prefix = Name("/ndn/ucla.edu/bms")
    dump("Register prefix", prefix.toUri())
    face.registerPrefix(prefix, echo.onInterest, echo.onRegisterFailed)

    while True: 
        face.processEvents()
        # We need to sleep for a few milliseconds so we don't use 100% of the CPU.
        time.sleep(0.01)

    face.shutdown()

# 需要导入模块: from pyndn import Name [as 别名]
# 或者: from pyndn.Name import getSubName [as 别名]
def main():
    interest = Interest()
    interest.wireDecode(TlvInterest)
    dump("Interest:")
    dumpInterest(interest)

    # Set the name again to clear the cached encoding so we encode again.
    interest.setName(interest.getName())
    encoding = interest.wireEncode()
    dump("")
    dump("Re-encoded interest", encoding.toHex())

    reDecodedInterest = Interest()
    reDecodedInterest.wireDecode(encoding)
    dump("Re-decoded Interest:")
    dumpInterest(reDecodedInterest)

    freshInterest = Interest(Name("/ndn/abc"))
    freshInterest.setMustBeFresh(False)
    dump(freshInterest.toUri())
    freshInterest.setMinSuffixComponents(4)
    freshInterest.setMaxSuffixComponents(6)
    freshInterest.getKeyLocator().setType(KeyLocatorType.KEY_LOCATOR_DIGEST)
    freshInterest.getKeyLocator().setKeyData(bytearray(
      [0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
       0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F]))
    freshInterest.getExclude().appendComponent(Name("abc")[0]).appendAny()
    freshInterest.setInterestLifetimeMilliseconds(30000)
    freshInterest.setChildSelector(1)
    freshInterest.setMustBeFresh(True);
    freshInterest.setScope(2)

    identityStorage = MemoryIdentityStorage()
    privateKeyStorage = MemoryPrivateKeyStorage()
    keyChain = KeyChain(IdentityManager(identityStorage, privateKeyStorage),
                        SelfVerifyPolicyManager(identityStorage))

    # Initialize the storage.
    keyName = Name("/testname/DSK-123")
    certificateName = keyName.getSubName(0, keyName.size() - 1).append(
      "KEY").append(keyName[-1]).append("ID-CERT").append("0")
    identityStorage.addKey(keyName, KeyType.RSA, Blob(DEFAULT_RSA_PUBLIC_KEY_DER))
    privateKeyStorage.setKeyPairForKeyName(
      keyName, KeyType.RSA, DEFAULT_RSA_PUBLIC_KEY_DER, DEFAULT_RSA_PRIVATE_KEY_DER)

    # Make a Face just so that we can sign the interest.
    face = Face("localhost")
    face.setCommandSigningInfo(keyChain, certificateName)
    face.makeCommandInterest(freshInterest)

    reDecodedFreshInterest = Interest()
    reDecodedFreshInterest.wireDecode(freshInterest.wireEncode())
    dump("")
    dump("Re-decoded fresh Interest:")
    dumpInterest(reDecodedFreshInterest)

    keyChain.verifyInterest(
      reDecodedFreshInterest, makeOnVerified("Freshly-signed Interest"),
      makeOnVerifyFailed("Freshly-signed Interest"))

# 需要导入模块: from pyndn import Name [as 别名]
# 或者: from pyndn.Name import getSubName [as 别名]
    def __init__(self):
        self.identityStorage = MemoryIdentityStorage()
        self.privateKeyStorage = MemoryPrivateKeyStorage()
        self.keyChain = KeyChain(IdentityManager(self.identityStorage, self.privateKeyStorage), 
                        SelfVerifyPolicyManager(self.identityStorage))
        keyName = Name("/testname/DSK-123")
        self.defaultCertName = keyName.getSubName(0, keyName.size() - 1).append(
      "KEY").append(keyName[-1]).append("ID-CERT").append("0")

        self.identityStorage.addKey(keyName, KeyType.RSA, Blob(DEFAULT_RSA_PUBLIC_KEY_DER))
        self.privateKeyStorage.setKeyPairForKeyName(
      keyName, KeyType.RSA, DEFAULT_RSA_PUBLIC_KEY_DER, DEFAULT_RSA_PRIVATE_KEY_DER)

# 需要导入模块: from pyndn import Name [as 别名]
# 或者: from pyndn.Name import getSubName [as 别名]
def main():
    data = Data()
    data.wireDecode(TlvData)
    dump("Decoded Data:")
    dumpData(data)

    # Set the content again to clear the cached encoding so we encode again.
    data.setContent(data.getContent())
    encoding = data.wireEncode()

    reDecodedData = Data()
    reDecodedData.wireDecode(encoding)
    dump("")
    dump("Re-decoded Data:")
    dumpData(reDecodedData)

    identityStorage = MemoryIdentityStorage()
    privateKeyStorage = MemoryPrivateKeyStorage()
    keyChain = KeyChain(IdentityManager(identityStorage, privateKeyStorage),
                        SelfVerifyPolicyManager(identityStorage))

    # Initialize the storage.
    keyName = Name("/testname/DSK-123")
    certificateName = keyName.getSubName(0, keyName.size() - 1).append(
      "KEY").append(keyName[-1]).append("ID-CERT").append("0")
    identityStorage.addKey(keyName, KeyType.RSA, Blob(DEFAULT_RSA_PUBLIC_KEY_DER))
    privateKeyStorage.setKeyPairForKeyName(
      keyName, KeyType.RSA, DEFAULT_RSA_PUBLIC_KEY_DER, DEFAULT_RSA_PRIVATE_KEY_DER)

    keyChain.verifyData(reDecodedData, makeOnVerified("Re-decoded Data"),
                        makeOnVerifyFailed("Re-decoded Data"))

    freshData = Data(Name("/ndn/abc"))
    freshData.setContent("SUCCESS!")
    freshData.getMetaInfo().setFreshnessPeriod(5000)
    freshData.getMetaInfo().setFinalBlockId(Name("/%00%09")[0])
    keyChain.sign(freshData, certificateName)
    dump("")
    dump("Freshly-signed Data:")
    dumpData(freshData)

    keyChain.verifyData(freshData, makeOnVerified("Freshly-signed Data"),
                        makeOnVerifyFailed("Freshly-signed Data"))

# 需要导入模块: from pyndn import Name [as 别名]
# 或者: from pyndn.Name import getSubName [as 别名]
    def test_subname(self):
        name = Name("/edu/cmu/andrew/user/3498478")
        subName1 = name.getSubName(0)
        self.assertEqual(subName1, name, 'Subname from first component does not match original name')
        subName2 = name.getSubName(3)
        self.assertEqual(subName2, Name("/user/3498478"))

        subName3 = name.getSubName(1,3)
        self.assertEqual(subName3, Name("/cmu/andrew/user"))

        subName4 = name.getSubName(0,100)
        self.assertEqual(name, subName4, 'Subname with more components than original should stop at end of original name')

        subName5 = name.getSubName(7,2)
        self.assertEqual(Name(), subName5, 'Subname beginning after end of name should be empty')

        subName6 = name.getSubName(-1,7)
        self.assertEqual(subName6, Name("/3498478"), 'Negative subname with more components than original should stop at end of original name')

        subName7 = name.getSubName(-5,5)
        self.assertEqual(subName7, name, 'Subname from (-length) should match original name')

# 需要导入模块: from pyndn import Name [as 别名]
# 或者: from pyndn.Name import getSubName [as 别名]
def createKeyChain():
    """
    Create an in-memory KeyChain with default keys.

    :return: A tuple with the new KeyChain and certificate name.
    :rtype: (KeyChain,Name)
    """
    identityStorage = MemoryIdentityStorage()
    privateKeyStorage = MemoryPrivateKeyStorage()
    keyChain = KeyChain(
      IdentityManager(identityStorage, privateKeyStorage),
      NoVerifyPolicyManager())

    # Initialize the storage.
    keyName = Name("/testname/DSK-123")
    certificateName = keyName.getSubName(0, keyName.size() - 1).append(
      "KEY").append(keyName.get(-1)).append("ID-CERT").append("0")
    identityStorage.addKey(
      keyName, KeyType.RSA, Blob(DEFAULT_RSA_PUBLIC_KEY_DER, False))
    privateKeyStorage.setKeyPairForKeyName(
      keyName, KeyType.RSA, DEFAULT_RSA_PUBLIC_KEY_DER,
      DEFAULT_RSA_PRIVATE_KEY_DER)

    return keyChain, certificateName

# 需要导入模块: from pyndn import Name [as 别名]
# 或者: from pyndn.Name import getSubName [as 别名]
def benchmarkEncodeDataSeconds(nIterations, useComplex, useCrypto):
    """
    Loop to encode a data packet nIterations times.

    :param int nIterations: The number of iterations.
    :param bool useComplex: If true, use a large name, large content and all
      fields. If false, use a small name, small content and only required
      fields.
    :param bool useCrypto: If true, sign the data packet.  If false, use a blank
      signature.
    :return: A tuple (duration, encoding) where duration is the number of
      seconds for all iterations and encoding is the wire encoding.
    :rtype: (float, Blob)
    """
    if useComplex:
        # Use a large name and content.
        name = Name(
          "/ndn/ucla.edu/apps/lwndn-test/numbers.txt/%FD%05%05%E8%0C%CE%1D/%00")

        contentString = ""
        count = 1
        contentString += "%d" % count
        count += 1
        while len(contentString) < 1115:
            contentString += " %d" % count
            count += 1
        content = Name.fromEscapedString(contentString)
    else:
        # Use a small name and content.
        name = Name("/test")
        content = Name.fromEscapedString("abc")
    finalBlockId = Name("/%00")[0]

    # Initialize the private key storage in case useCrypto is true.
    identityStorage = MemoryIdentityStorage()
    privateKeyStorage = MemoryPrivateKeyStorage()
    keyChain = KeyChain(IdentityManager(identityStorage, privateKeyStorage),
                        SelfVerifyPolicyManager(identityStorage))
    keyName = Name("/testname/DSK-123")
    certificateName = keyName.getSubName(0, keyName.size() - 1).append(
      "KEY").append(keyName[-1]).append("ID-CERT").append("0")
    identityStorage.addKey(keyName, KeyType.RSA, Blob(DEFAULT_RSA_PUBLIC_KEY_DER))
    privateKeyStorage.setKeyPairForKeyName(
      keyName, KeyType.RSA, DEFAULT_RSA_PUBLIC_KEY_DER, DEFAULT_RSA_PRIVATE_KEY_DER)

    # Set up signatureBits in case useCrypto is false.
    signatureBits = Blob(bytearray(256))
    emptyBlob = Blob([])

    start = getNowSeconds()
    for i in range(nIterations):
        data = Data(name)
        data.setContent(content)
        if useComplex:
            data.getMetaInfo().setFreshnessPeriod(1000)
            data.getMetaInfo().setFinalBlockId(finalBlockId)

        if useCrypto:
            # This sets the signature fields.
            keyChain.sign(data, certificateName)
        else:
            # Imitate IdentityManager.signByCertificate to set up the signature
            # fields, but don't sign.
            sha256Signature = data.getSignature()
            keyLocator = sha256Signature.getKeyLocator()
            keyLocator.setType(KeyLocatorType.KEYNAME)
            keyLocator.setKeyName(certificateName)
            sha256Signature.setSignature(signatureBits)

        encoding = data.wireEncode()

    finish = getNowSeconds()

    return (finish - start, encoding)

# 需要导入模块: from pyndn import Name [as 别名]
# 或者: from pyndn.Name import getSubName [as 别名]
    from utils import getKeyID

    publisher = RepoSocketPublisher(12345)

    data = Data(Name("/localhost/repo-ng/test/001"))
    data.setContent("SUCCESS!")
    data.getMetaInfo().setFreshnessPeriod(1000000)

    identityStorage = MemoryIdentityStorage()
    privateKeyStorage = MemoryPrivateKeyStorage()
    keyChain = KeyChain(IdentityManager(identityStorage, privateKeyStorage), SelfVerifyPolicyManager(identityStorage))
    keyfile = "../keychain/keys/pub_user.pem"
    f = open(keyfile, "r")
    key = RSA.importKey(f.read())
    key_name = Name("/localhost/repo-ng/test/signer")
    signer_name = Name(key_name).append(getKeyID(key))
    key_pub_der = bytearray(key.publickey().exportKey(format="DER"))
    key_pri_der = bytearray(key.exportKey(format="DER"))
    identityStorage.addKey(signer_name, KeyType.RSA, Blob(key_pub_der))
    privateKeyStorage.setKeyPairForKeyName(signer_name, key_pub_der, key_pri_der)
    cert_name = (
        signer_name.getSubName(0, signer_name.size() - 1)
        .append("KEY")
        .append(signer_name[-1])
        .append("ID-CERT")
        .append("0")
    )
    keyChain.sign(data, cert_name)
    publisher.put(data)

# 需要导入模块: from pyndn import Name [as 别名]
# 或者: from pyndn.Name import getSubName [as 别名]
class BACnetAggregator(BIPSimpleApplication, Logging):

    def __init__(self, config):
        if _debug: BACnetAggregator._debug("__init__ %r", config)

        # get local address from the config file
        laddr = config.get('BACpypes', 'address')
        
        # make a local device object
        local_device = \
          LocalDeviceObject( objectName=config.get('BACpypes','objectName')
                             , objectIdentifier=config.getint('BACpypes','objectIdentifier')
                             , maxApduLengthAccepted=config.getint('BACpypes','maxApduLengthAccepted')
                             , segmentationSupported=config.get('BACpypes','segmentationSupported')
                             , vendorIdentifier=config.getint('BACpypes','vendorIdentifier')
              )
        
        # build a bit string that knows about the bit names
        pss = ServicesSupported()
        pss['whoIs'] = 1
        pss['iAm'] = 1
        pss['readProperty'] = 1
        pss['writeProperty'] = 1
        
        # set the property value to be just the bits
        local_device.protocolServicesSupported = pss.value
        
        # make a simple application
        BIPSimpleApplication.__init__(self, local_device, laddr)

        
        # create logger
        self.logger = BACnetDataLogger(self, config)
        self.loadKey()
        # keep track of requests to line up responses
        self._request = None

        # connect to local repo
        self.publisher = RepoSocketPublisher(12345)
        self.interval = 5 # in seconds
    
    def loadKey(self):
        self.identityStorage = MemoryIdentityStorage()
        self.privateKeyStorage = MemoryPrivateKeyStorage()
        self.keychain = KeyChain(IdentityManager(self.identityStorage, self.privateKeyStorage))

        f = open(key_file, "r")
        self.key = RSA.importKey(f.read())
        self.key_name = Name(bld_root).append(getKeyID(self.key))
        key_pub_der = bytearray(self.key.publickey().exportKey(format="DER"))
        key_pri_der = bytearray(self.key.exportKey(format="DER"))
        self.identityStorage.addKey(self.key_name, KeyType.RSA, Blob(key_pub_der))
        self.privateKeyStorage.setKeyPairForKeyName(self.key_name, key_pub_der, key_pri_der)
        self.cert_name = self.key_name.getSubName(0, self.key_name.size() - 1).append(
            "KEY").append(self.key_name[-1]).append("ID-CERT").append("0")

        print 'KeyName = ' + self.key_name.toUri()
        print 'CertName = ' + self.cert_name.toUri()

    def publishData(self, name_str, payload, timestamp):
        data = Data(Name(name_str).append(bytearray(timestamp)))
        iv = Random.new().read(AES.block_size)
        encryptor = AES.new(key, AES.MODE_CBC, iv)
        data.setContent(bytearray(time_s + iv + encryptor.encrypt(pad(json.dumps(payload)))))
        data.getMetaInfo().setFreshnessPeriod(10000)
        self.keychain.sign(data, self.cert_name)
        self.publisher.put(data)
        #print payload
        #print 'Publish ' + data.getName().toUri()

    def request(self, apdu):
        if _debug: BACnetAggregator._debug("request %r", apdu)

        # save a copy of the request
        self._request = apdu

        # forward it along
        BIPSimpleApplication.request(self, apdu)

    def confirmation(self, apdu):
        #print thread.get_ident()
        global kds_count, key, time_s, point_count
        
        if _debug: BACnetAggregator._debug("confirmation %r", apdu)

        if isinstance(apdu, Error):
            sys.stdout.write("error: %s\n" % (apdu.errorCode,))
            sys.stdout.flush()

        elif isinstance(apdu, AbortPDU):
            apdu.debug_contents()

        elif (isinstance(self._request, ReadPropertyRequest)) and (isinstance(apdu, ReadPropertyACK)):
            # find the datatype
            datatype = get_datatype(apdu.objectIdentifier[0], apdu.propertyIdentifier)
            BACnetAggregator._debug("    - datatype: %r", datatype)
            if not datatype:
                raise TypeError, "unknown datatype"

            # special case for array parts, others are managed by cast_out
#.........这里部分代码省略.........

# 需要导入模块: from pyndn import Name [as 别名]
# 或者: from pyndn.Name import getSubName [as 别名]
    rp = RepoCommandParameter()
    dataPrefix = Name("/example/data/1/test/test1")
    
    rp.setName(dataPrefix)
    rp.setStartBlockId(0)
    
    interest = Interest(Name("/example/repo/1").append("insert").append(rp.wireEncode()))
    
    identityStorage = MemoryIdentityStorage()
    privateKeyStorage = MemoryPrivateKeyStorage()
    keyChain = KeyChain(IdentityManager(identityStorage, privateKeyStorage),
                        SelfVerifyPolicyManager(identityStorage))

    # Initialize the storage.
    keyName = Name("/testname/DSK-123")
    certificateName = keyName.getSubName(0, keyName.size() - 1).append(
      "KEY").append(keyName[-1]).append("ID-CERT").append("0")
    identityStorage.addKey(keyName, KeyType.RSA, Blob(DEFAULT_RSA_PUBLIC_KEY_DER))
    privateKeyStorage.setKeyPairForKeyName(
      keyName, KeyType.RSA, DEFAULT_RSA_PUBLIC_KEY_DER, DEFAULT_RSA_PRIVATE_KEY_DER)

    # Make a Face just so that we can sign the interest.
    face = Face("localhost")
    face.setCommandSigningInfo(keyChain, certificateName)
    face.makeCommandInterest(interest)
    
    callbacks = Callbacks()
    print interest.getName().toUri()
    face.expressInterest(interest, callbacks.onData, callbacks.onTimeout)
    
    face.registerPrefix(dataPrefix, callbacks.onInterest, callbacks.onRegisterFailed)

# 需要导入模块: from pyndn import Name [as 别名]
# 或者: from pyndn.Name import getSubName [as 别名]
class SensorDataLogger:
    def __init__(self, data_interval):
        # connect to modbus
        self.master = modbus_tcp.TcpMaster("172.17.66.246", 502)
        # self.master.set_timeout(120) # in seconds
        
        # connect to local repo
        self.publisher = RepoSocketPublisher(12345)
        self.prefix = "/ndn/ucla.edu/bms/strathmore/data/demand"
        self.interval = data_interval # in seconds
        
        self.loadKey()
        
    def loadKey(self):
        self.identityStorage = MemoryIdentityStorage()
        self.privateKeyStorage = MemoryPrivateKeyStorage()
        self.keychain = KeyChain(IdentityManager(self.identityStorage, self.privateKeyStorage))

        f = open(key_file, "r")
        self.key = RSA.importKey(f.read())
        self.key_name = Name(bld_root).append(getKeyID(self.key))
        key_pub_der = bytearray(self.key.publickey().exportKey(format="DER"))
        key_pri_der = bytearray(self.key.exportKey(format="DER"))
        self.identityStorage.addKey(self.key_name, KeyType.RSA, Blob(key_pub_der))
        self.privateKeyStorage.setKeyPairForKeyName(self.key_name, key_pub_der, key_pri_der)
        self.cert_name = self.key_name.getSubName(0, self.key_name.size() - 1).append(
            "KEY").append(self.key_name[-1]).append("ID-CERT").append("0")

        print 'KeyName = ' + self.key_name.toUri()
        print 'CertName = ' + self.cert_name.toUri()

    def publishData(self, key, key_ts, payload, timestamp):
        data = Data(Name(self.prefix).append(bytearray(timestamp)))
        iv = Random.new().read(AES.block_size)
        encryptor = AES.new(key, AES.MODE_CBC, iv)
        data.setContent(bytearray(key_ts + iv + encryptor.encrypt(pad(json.dumps(payload)))))
        data.getMetaInfo().setFreshnessPeriod(5000)
        self.keychain.sign(data, self.cert_name)
        self.publisher.put(data)
        #print payload
        #print data.getName().toUri()

    def run(self):
        key_ts = struct.pack('!Q', int(time.time() * 1000))
        key = Random.new().read(32)
        kds_count = -1
        
        while (True):
            # KDS
            kds_count = kds_count + 1
            if kds_count % 120 == 0:
                key_ts = struct.pack("!Q", int(time.time() * 1000))
                key = Random.new().read(32)
                kds_thread = kds.SimpleKDSPublisher(Name(bld_root), self.keychain, self.cert_name, key, key_ts)
                kds_thread.start()
                kds_count = 0

            # Data
            now = int(time.time() * 1000) # in milliseconds

            a = self.master.execute(100, cst.READ_HOLDING_REGISTERS, 166, 1)
            b = self.master.execute(100, cst.READ_HOLDING_REGISTERS, 167, 1)
            vln = (b[0] << 16) + a[0]
            c = self.master.execute(1, cst.READ_HOLDING_REGISTERS, 150, 1)
            la = c[0]
            
            payload = {'ts': now, 'vlna': vln, 'la': la}
            timestamp = struct.pack("!Q", now) # timestamp is in milliseconds

            self.publishData(key, key_ts, payload, timestamp)

            time.sleep(self.interval)