eigenein · October 10, 2011 11:33 · Oct 10, 2011
diff --git a/pyDes.py b/pyDes.py
@@ -0,0 +1,852 @@
+#############################################################################
+# 				Documentation				    #
+#############################################################################
+
+# Author:   Todd Whiteman
+# Date:     16th March, 2009
+# Verion:   2.0.0
+# License:  Public Domain - free to do as you wish
+# Homepage: http://twhiteman.netfirms.com/des.html
+#
+# This is a pure python implementation of the DES encryption algorithm.
+# It's pure python to avoid portability issues, since most DES 
+# implementations are programmed in C (for performance reasons).
+#
+# Triple DES class is also implemented, utilising the DES base. Triple DES
+# is either DES-EDE3 with a 24 byte key, or DES-EDE2 with a 16 byte key.
+#
+# See the README.txt that should come with this python module for the
+# implementation methods used.
+#
+# Thanks to:
+#  * David Broadwell for ideas, comments and suggestions.
+#  * Mario Wolff for pointing out and debugging some triple des CBC errors.
+#  * Santiago Palladino for providing the PKCS5 padding technique.
+#  * Shaya for correcting the PAD_PKCS5 triple des CBC errors.
+#
+"""A pure python implementation of the DES and TRIPLE DES encryption algorithms.
+
+Class initialization
+--------------------
+pyDes.des(key, [mode], [IV], [pad], [padmode])
+pyDes.triple_des(key, [mode], [IV], [pad], [padmode])
+
+key     -> Bytes containing the encryption key. 8 bytes for DES, 16 or 24 bytes
+	   for Triple DES
+mode    -> Optional argument for encryption type, can be either
+	   pyDes.ECB (Electronic Code Book) or pyDes.CBC (Cypher Block Chaining)
+IV      -> Optional Initial Value bytes, must be supplied if using CBC mode.
+	   Length must be 8 bytes.
+pad     -> Optional argument, set the pad character (PAD_NORMAL) to use during
+	   all encrypt/decrpt operations done with this instance.
+padmode -> Optional argument, set the padding mode (PAD_NORMAL or PAD_PKCS5)
+	   to use during all encrypt/decrpt operations done with this instance.
+
+I recommend to use PAD_PKCS5 padding, as then you never need to worry about any
+padding issues, as the padding can be removed unambiguously upon decrypting
+data that was encrypted using PAD_PKCS5 padmode.
+
+Common methods
+--------------
+encrypt(data, [pad], [padmode])
+decrypt(data, [pad], [padmode])
+
+data    -> Bytes to be encrypted/decrypted
+pad     -> Optional argument. Only when using padmode of PAD_NORMAL. For
+	   encryption, adds this characters to the end of the data block when
+	   data is not a multiple of 8 bytes. For decryption, will remove the
+	   trailing characters that match this pad character from the last 8
+	   bytes of the unencrypted data block.
+padmode -> Optional argument, set the padding mode, must be one of PAD_NORMAL
+	   or PAD_PKCS5). Defaults to PAD_NORMAL.
+	  
+
+Example
+-------
+from pyDes import *
+
+data = "Please encrypt my data"
+k = des("DESCRYPT", CBC, "\0\0\0\0\0\0\0\0", pad=None, padmode=PAD_PKCS5)
+# For Python3, you'll need to use bytes, i.e.:
+#   data = b"Please encrypt my data"
+#   k = des(b"DESCRYPT", CBC, b"\0\0\0\0\0\0\0\0", pad=None, padmode=PAD_PKCS5)
+d = k.encrypt(data)
+print "Encrypted: %r" % d
+print "Decrypted: %r" % k.decrypt(d)
+assert k.decrypt(d, padmode=PAD_PKCS5) == data
+
+
+See the module source (pyDes.py) for more examples of use.
+You can also run the pyDes.py file without and arguments to see a simple test.
+
+Note: This code was not written for high-end systems needing a fast
+      implementation, but rather a handy portable solution with small usage.
+
+"""
+
+import sys
+
+# _pythonMajorVersion is used to handle Python2 and Python3 differences.
+_pythonMajorVersion = sys.version_info[0]
+
+# Modes of crypting / cyphering
+ECB =	0
+CBC =	1
+
+# Modes of padding
+PAD_NORMAL = 1
+PAD_PKCS5 = 2
+
+# PAD_PKCS5: is a method that will unambiguously remove all padding
+#            characters after decryption, when originally encrypted with
+#            this padding mode.
+# For a good description of the PKCS5 padding technique, see:
+# http://www.faqs.org/rfcs/rfc1423.html
+
+# The base class shared by des and triple des.
+class _baseDes(object):
+	def __init__(self, mode=ECB, IV=None, pad=None, padmode=PAD_NORMAL):
+		if IV:
+			IV = self._guardAgainstUnicode(IV)
+		if pad:
+			pad = self._guardAgainstUnicode(pad)
+		self.block_size = 8
+		# Sanity checking of arguments.
+		if pad and padmode == PAD_PKCS5:
+			raise ValueError("Cannot use a pad character with PAD_PKCS5")
+		if IV and len(IV) != self.block_size:
+			raise ValueError("Invalid Initial Value (IV), must be a multiple of " + str(self.block_size) + " bytes")
+
+		# Set the passed in variables
+		self._mode = mode
+		self._iv = IV
+		self._padding = pad
+		self._padmode = padmode
+
+	def getKey(self):
+		"""getKey() -> bytes"""
+		return self.__key
+
+	def setKey(self, key):
+		"""Will set the crypting key for this object."""
+		key = self._guardAgainstUnicode(key)
+		self.__key = key
+
+	def getMode(self):
+		"""getMode() -> pyDes.ECB or pyDes.CBC"""
+		return self._mode
+
+	def setMode(self, mode):
+		"""Sets the type of crypting mode, pyDes.ECB or pyDes.CBC"""
+		self._mode = mode
+
+	def getPadding(self):
+		"""getPadding() -> bytes of length 1. Padding character."""
+		return self._padding
+
+	def setPadding(self, pad):
+		"""setPadding() -> bytes of length 1. Padding character."""
+		if pad is not None:
+			pad = self._guardAgainstUnicode(pad)
+		self._padding = pad
+
+	def getPadMode(self):
+		"""getPadMode() -> pyDes.PAD_NORMAL or pyDes.PAD_PKCS5"""
+		return self._padmode
+
+	def setPadMode(self, mode):
+		"""Sets the type of padding mode, pyDes.PAD_NORMAL or pyDes.PAD_PKCS5"""
+		self._padmode = mode
+
+	def getIV(self):
+		"""getIV() -> bytes"""
+		return self._iv
+
+	def setIV(self, IV):
+		"""Will set the Initial Value, used in conjunction with CBC mode"""
+		if not IV or len(IV) != self.block_size:
+			raise ValueError("Invalid Initial Value (IV), must be a multiple of " + str(self.block_size) + " bytes")
+		IV = self._guardAgainstUnicode(IV)
+		self._iv = IV
+
+	def _padData(self, data, pad, padmode):
+		# Pad data depending on the mode
+		if padmode is None:
+			# Get the default padding mode.
+			padmode = self.getPadMode()
+		if pad and padmode == PAD_PKCS5:
+			raise ValueError("Cannot use a pad character with PAD_PKCS5")
+
+		if padmode == PAD_NORMAL:
+			if len(data) % self.block_size == 0:
+				# No padding required.
+				return data
+
+			if not pad:
+				# Get the default padding.
+				pad = self.getPadding()
+			if not pad:
+				raise ValueError("Data must be a multiple of " + str(self.block_size) + " bytes in length. Use padmode=PAD_PKCS5 or set the pad character.")
+			data += (self.block_size - (len(data) % self.block_size)) * pad
+
+		elif padmode == PAD_PKCS5:
+			pad_len = 8 - (len(data) % self.block_size)
+			if _pythonMajorVersion < 3:
+				data += pad_len * chr(pad_len)
+			else:
+				data += bytes([pad_len] * pad_len)
+
+		return data
+
+	def _unpadData(self, data, pad, padmode):
+		# Unpad data depending on the mode.
+		if not data:
+			return data
+		if pad and padmode == PAD_PKCS5:
+			raise ValueError("Cannot use a pad character with PAD_PKCS5")
+		if padmode is None:
+			# Get the default padding mode.
+			padmode = self.getPadMode()
+
+		if padmode == PAD_NORMAL:
+			if not pad:
+				# Get the default padding.
+				pad = self.getPadding()
+			if pad:
+				data = data[:-self.block_size] + \
+				       data[-self.block_size:].rstrip(pad)
+
+		elif padmode == PAD_PKCS5:
+			if _pythonMajorVersion < 3:
+				pad_len = ord(data[-1])
+			else:
+				pad_len = data[-1]
+			data = data[:-pad_len]
+
+		return data
+
+	def _guardAgainstUnicode(self, data):
+		# Only accept byte strings or ascii unicode values, otherwise
+		# there is no way to correctly decode the data into bytes.
+		if _pythonMajorVersion < 3:
+			if isinstance(data, unicode):
+				raise ValueError("pyDes can only work with bytes, not Unicode strings.")
+		else:
+			if isinstance(data, str):
+				# Only accept ascii unicode values.
+				try:
+					return data.encode('ascii')
+				except UnicodeEncodeError:
+					pass
+				raise ValueError("pyDes can only work with encoded strings, not Unicode.")
+		return data
+
+#############################################################################
+# 				    DES					    #
+#############################################################################
+class des(_baseDes):
+	"""DES encryption/decrytpion class
+
+	Supports ECB (Electronic Code Book) and CBC (Cypher Block Chaining) modes.
+
+	pyDes.des(key,[mode], [IV])
+
+	key  -> Bytes containing the encryption key, must be exactly 8 bytes
+	mode -> Optional argument for encryption type, can be either pyDes.ECB
+		(Electronic Code Book), pyDes.CBC (Cypher Block Chaining)
+	IV   -> Optional Initial Value bytes, must be supplied if using CBC mode.
+		Must be 8 bytes in length.
+	pad  -> Optional argument, set the pad character (PAD_NORMAL) to use
+		during all encrypt/decrpt operations done with this instance.
+	padmode -> Optional argument, set the padding mode (PAD_NORMAL or
+		PAD_PKCS5) to use during all encrypt/decrpt operations done
+		with this instance.
+	"""
+
+
+	# Permutation and translation tables for DES
+	__pc1 = [56, 48, 40, 32, 24, 16,  8,
+		  0, 57, 49, 41, 33, 25, 17,
+		  9,  1, 58, 50, 42, 34, 26,
+		 18, 10,  2, 59, 51, 43, 35,
+		 62, 54, 46, 38, 30, 22, 14,
+		  6, 61, 53, 45, 37, 29, 21,
+		 13,  5, 60, 52, 44, 36, 28,
+		 20, 12,  4, 27, 19, 11,  3
+	]
+
+	# number left rotations of pc1
+	__left_rotations = [
+		1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1
+	]
+
+	# permuted choice key (table 2)
+	__pc2 = [
+		13, 16, 10, 23,  0,  4,
+		 2, 27, 14,  5, 20,  9,
+		22, 18, 11,  3, 25,  7,
+		15,  6, 26, 19, 12,  1,
+		40, 51, 30, 36, 46, 54,
+		29, 39, 50, 44, 32, 47,
+		43, 48, 38, 55, 33, 52,
+		45, 41, 49, 35, 28, 31
+	]
+
+	# initial permutation IP
+	__ip = [57, 49, 41, 33, 25, 17, 9,  1,
+		59, 51, 43, 35, 27, 19, 11, 3,
+		61, 53, 45, 37, 29, 21, 13, 5,
+		63, 55, 47, 39, 31, 23, 15, 7,
+		56, 48, 40, 32, 24, 16, 8,  0,
+		58, 50, 42, 34, 26, 18, 10, 2,
+		60, 52, 44, 36, 28, 20, 12, 4,
+		62, 54, 46, 38, 30, 22, 14, 6
+	]
+
+	# Expansion table for turning 32 bit blocks into 48 bits
+	__expansion_table = [
+		31,  0,  1,  2,  3,  4,
+		 3,  4,  5,  6,  7,  8,
+		 7,  8,  9, 10, 11, 12,
+		11, 12, 13, 14, 15, 16,
+		15, 16, 17, 18, 19, 20,
+		19, 20, 21, 22, 23, 24,
+		23, 24, 25, 26, 27, 28,
+		27, 28, 29, 30, 31,  0
+	]
+
+	# The (in)famous S-boxes
+	__sbox = [
+		# S1
+		[14, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9, 0, 7,
+		 0, 15, 7, 4, 14, 2, 13, 1, 10, 6, 12, 11, 9, 5, 3, 8,
+		 4, 1, 14, 8, 13, 6, 2, 11, 15, 12, 9, 7, 3, 10, 5, 0,
+		 15, 12, 8, 2, 4, 9, 1, 7, 5, 11, 3, 14, 10, 0, 6, 13],
+
+		# S2
+		[15, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10,
+		 3, 13, 4, 7, 15, 2, 8, 14, 12, 0, 1, 10, 6, 9, 11, 5,
+		 0, 14, 7, 11, 10, 4, 13, 1, 5, 8, 12, 6, 9, 3, 2, 15,
+		 13, 8, 10, 1, 3, 15, 4, 2, 11, 6, 7, 12, 0, 5, 14, 9],
+
+		# S3
+		[10, 0, 9, 14, 6, 3, 15, 5, 1, 13, 12, 7, 11, 4, 2, 8,
+		 13, 7, 0, 9, 3, 4, 6, 10, 2, 8, 5, 14, 12, 11, 15, 1,
+		 13, 6, 4, 9, 8, 15, 3, 0, 11, 1, 2, 12, 5, 10, 14, 7,
+		 1, 10, 13, 0, 6, 9, 8, 7, 4, 15, 14, 3, 11, 5, 2, 12],
+
+		# S4
+		[7, 13, 14, 3, 0, 6, 9, 10, 1, 2, 8, 5, 11, 12, 4, 15,
+		 13, 8, 11, 5, 6, 15, 0, 3, 4, 7, 2, 12, 1, 10, 14, 9,
+		 10, 6, 9, 0, 12, 11, 7, 13, 15, 1, 3, 14, 5, 2, 8, 4,
+		 3, 15, 0, 6, 10, 1, 13, 8, 9, 4, 5, 11, 12, 7, 2, 14],
+
+		# S5
+		[2, 12, 4, 1, 7, 10, 11, 6, 8, 5, 3, 15, 13, 0, 14, 9,
+		 14, 11, 2, 12, 4, 7, 13, 1, 5, 0, 15, 10, 3, 9, 8, 6,
+		 4, 2, 1, 11, 10, 13, 7, 8, 15, 9, 12, 5, 6, 3, 0, 14,
+		 11, 8, 12, 7, 1, 14, 2, 13, 6, 15, 0, 9, 10, 4, 5, 3],
+
+		# S6
+		[12, 1, 10, 15, 9, 2, 6, 8, 0, 13, 3, 4, 14, 7, 5, 11,
+		 10, 15, 4, 2, 7, 12, 9, 5, 6, 1, 13, 14, 0, 11, 3, 8,
+		 9, 14, 15, 5, 2, 8, 12, 3, 7, 0, 4, 10, 1, 13, 11, 6,
+		 4, 3, 2, 12, 9, 5, 15, 10, 11, 14, 1, 7, 6, 0, 8, 13],
+
+		# S7
+		[4, 11, 2, 14, 15, 0, 8, 13, 3, 12, 9, 7, 5, 10, 6, 1,
+		 13, 0, 11, 7, 4, 9, 1, 10, 14, 3, 5, 12, 2, 15, 8, 6,
+		 1, 4, 11, 13, 12, 3, 7, 14, 10, 15, 6, 8, 0, 5, 9, 2,
+		 6, 11, 13, 8, 1, 4, 10, 7, 9, 5, 0, 15, 14, 2, 3, 12],
+
+		# S8
+		[13, 2, 8, 4, 6, 15, 11, 1, 10, 9, 3, 14, 5, 0, 12, 7,
+		 1, 15, 13, 8, 10, 3, 7, 4, 12, 5, 6, 11, 0, 14, 9, 2,
+		 7, 11, 4, 1, 9, 12, 14, 2, 0, 6, 10, 13, 15, 3, 5, 8,
+		 2, 1, 14, 7, 4, 10, 8, 13, 15, 12, 9, 0, 3, 5, 6, 11],
+	]
+
+
+	# 32-bit permutation function P used on the output of the S-boxes
+	__p = [
+		15, 6, 19, 20, 28, 11,
+		27, 16, 0, 14, 22, 25,
+		4, 17, 30, 9, 1, 7,
+		23,13, 31, 26, 2, 8,
+		18, 12, 29, 5, 21, 10,
+		3, 24
+	]
+
+	# final permutation IP^-1
+	__fp = [
+		39,  7, 47, 15, 55, 23, 63, 31,
+		38,  6, 46, 14, 54, 22, 62, 30,
+		37,  5, 45, 13, 53, 21, 61, 29,
+		36,  4, 44, 12, 52, 20, 60, 28,
+		35,  3, 43, 11, 51, 19, 59, 27,
+		34,  2, 42, 10, 50, 18, 58, 26,
+		33,  1, 41,  9, 49, 17, 57, 25,
+		32,  0, 40,  8, 48, 16, 56, 24
+	]
+
+	# Type of crypting being done
+	ENCRYPT =	0x00
+	DECRYPT =	0x01
+
+	# Initialisation
+	def __init__(self, key, mode=ECB, IV=None, pad=None, padmode=PAD_NORMAL):
+		# Sanity checking of arguments.
+		if len(key) != 8:
+			raise ValueError("Invalid DES key size. Key must be exactly 8 bytes long.")
+		_baseDes.__init__(self, mode, IV, pad, padmode)
+		self.key_size = 8
+
+		self.L = []
+		self.R = []
+		self.Kn = [ [0] * 48 ] * 16	# 16 48-bit keys (K1 - K16)
+		self.final = []
+
+		self.setKey(key)
+
+	def setKey(self, key):
+		"""Will set the crypting key for this object. Must be 8 bytes."""
+		_baseDes.setKey(self, key)
+		self.__create_sub_keys()
+
+	def __String_to_BitList(self, data):
+		"""Turn the string data, into a list of bits (1, 0)'s"""
+		if _pythonMajorVersion < 3:
+			# Turn the strings into integers. Python 3 uses a bytes
+			# class, which already has this behaviour.
+			data = [ord(c) for c in data]
+		l = len(data) * 8
+		result = [0] * l
+		pos = 0
+		for ch in data:
+			i = 7
+			while i >= 0:
+				if ch & (1 << i) != 0:
+					result[pos] = 1
+				else:
+					result[pos] = 0
+				pos += 1
+				i -= 1
+
+		return result
+
+	def __BitList_to_String(self, data):
+		"""Turn the list of bits -> data, into a string"""
+		result = []
+		pos = 0
+		c = 0
+		while pos < len(data):
+			c += data[pos] << (7 - (pos % 8))
+			if (pos % 8) == 7:
+				result.append(c)
+				c = 0
+			pos += 1
+
+		if _pythonMajorVersion < 3:
+			return ''.join([ chr(c) for c in result ])
+		else:
+			return bytes(result)
+
+	def __permutate(self, table, block):
+		"""Permutate this block with the specified table"""
+		return list(map(lambda x: block[x], table))
+
+	# Transform the secret key, so that it is ready for data processing
+	# Create the 16 subkeys, K[1] - K[16]
+	def __create_sub_keys(self):
+		"""Create the 16 subkeys K[1] to K[16] from the given key"""
+		key = self.__permutate(des.__pc1, self.__String_to_BitList(self.getKey()))
+		i = 0
+		# Split into Left and Right sections
+		self.L = key[:28]
+		self.R = key[28:]
+		while i < 16:
+			j = 0
+			# Perform circular left shifts
+			while j < des.__left_rotations[i]:
+				self.L.append(self.L[0])
+				del self.L[0]
+
+				self.R.append(self.R[0])
+				del self.R[0]
+
+				j += 1
+
+			# Create one of the 16 subkeys through pc2 permutation
+			self.Kn[i] = self.__permutate(des.__pc2, self.L + self.R)
+
+			i += 1
+
+	# Main part of the encryption algorithm, the number cruncher :)
+	def __des_crypt(self, block, crypt_type):
+		"""Crypt the block of data through DES bit-manipulation"""
+		block = self.__permutate(des.__ip, block)
+		self.L = block[:32]
+		self.R = block[32:]
+
+		# Encryption starts from Kn[1] through to Kn[16]
+		if crypt_type == des.ENCRYPT:
+			iteration = 0
+			iteration_adjustment = 1
+		# Decryption starts from Kn[16] down to Kn[1]
+		else:
+			iteration = 15
+			iteration_adjustment = -1
+
+		i = 0
+		while i < 16:
+			# Make a copy of R[i-1], this will later become L[i]
+			tempR = self.R[:]
+
+			# Permutate R[i - 1] to start creating R[i]
+			self.R = self.__permutate(des.__expansion_table, self.R)
+
+			# Exclusive or R[i - 1] with K[i], create B[1] to B[8] whilst here
+			self.R = list(map(lambda x, y: x ^ y, self.R, self.Kn[iteration]))
+			B = [self.R[:6], self.R[6:12], self.R[12:18], self.R[18:24], self.R[24:30], self.R[30:36], self.R[36:42], self.R[42:]]
+			# Optimization: Replaced below commented code with above
+			#j = 0
+			#B = []
+			#while j < len(self.R):
+			#	self.R[j] = self.R[j] ^ self.Kn[iteration][j]
+			#	j += 1
+			#	if j % 6 == 0:
+			#		B.append(self.R[j-6:j])
+
+			# Permutate B[1] to B[8] using the S-Boxes
+			j = 0
+			Bn = [0] * 32
+			pos = 0
+			while j < 8:
+				# Work out the offsets
+				m = (B[j][0] << 1) + B[j][5]
+				n = (B[j][1] << 3) + (B[j][2] << 2) + (B[j][3] << 1) + B[j][4]
+
+				# Find the permutation value
+				v = des.__sbox[j][(m << 4) + n]
+
+				# Turn value into bits, add it to result: Bn
+				Bn[pos] = (v & 8) >> 3
+				Bn[pos + 1] = (v & 4) >> 2
+				Bn[pos + 2] = (v & 2) >> 1
+				Bn[pos + 3] = v & 1
+
+				pos += 4
+				j += 1
+
+			# Permutate the concatination of B[1] to B[8] (Bn)
+			self.R = self.__permutate(des.__p, Bn)
+
+			# Xor with L[i - 1]
+			self.R = list(map(lambda x, y: x ^ y, self.R, self.L))
+			# Optimization: This now replaces the below commented code
+			#j = 0
+			#while j < len(self.R):
+			#	self.R[j] = self.R[j] ^ self.L[j]
+			#	j += 1
+
+			# L[i] becomes R[i - 1]
+			self.L = tempR
+
+			i += 1
+			iteration += iteration_adjustment
+
+		# Final permutation of R[16]L[16]
+		self.final = self.__permutate(des.__fp, self.R + self.L)
+		return self.final
+
+
+	# Data to be encrypted/decrypted
+	def crypt(self, data, crypt_type):
+		"""Crypt the data in blocks, running it through des_crypt()"""
+
+		# Error check the data
+		if not data:
+			return ''
+		if len(data) % self.block_size != 0:
+			if crypt_type == des.DECRYPT: # Decryption must work on 8 byte blocks
+				raise ValueError("Invalid data length, data must be a multiple of " + str(self.block_size) + " bytes\n.")
+			if not self.getPadding():
+				raise ValueError("Invalid data length, data must be a multiple of " + str(self.block_size) + " bytes\n. Try setting the optional padding character")
+			else:
+				data += (self.block_size - (len(data) % self.block_size)) * self.getPadding()
+			# print "Len of data: %f" % (len(data) / self.block_size)
+
+		if self.getMode() == CBC:
+			if self.getIV():
+				iv = self.__String_to_BitList(self.getIV())
+			else:
+				raise ValueError("For CBC mode, you must supply the Initial Value (IV) for ciphering")
+
+		# Split the data into blocks, crypting each one seperately
+		i = 0
+		dict = {}
+		result = []
+		#cached = 0
+		#lines = 0
+		while i < len(data):
+			# Test code for caching encryption results
+			#lines += 1
+			#if dict.has_key(data[i:i+8]):
+				#print "Cached result for: %s" % data[i:i+8]
+			#	cached += 1
+			#	result.append(dict[data[i:i+8]])
+			#	i += 8
+			#	continue
+
+			block = self.__String_to_BitList(data[i:i+8])
+
+			# Xor with IV if using CBC mode
+			if self.getMode() == CBC:
+				if crypt_type == des.ENCRYPT:
+					block = list(map(lambda x, y: x ^ y, block, iv))
+					#j = 0
+					#while j < len(block):
+					#	block[j] = block[j] ^ iv[j]
+					#	j += 1
+
+				processed_block = self.__des_crypt(block, crypt_type)
+
+				if crypt_type == des.DECRYPT:
+					processed_block = list(map(lambda x, y: x ^ y, processed_block, iv))
+					#j = 0
+					#while j < len(processed_block):
+					#	processed_block[j] = processed_block[j] ^ iv[j]
+					#	j += 1
+					iv = block
+				else:
+					iv = processed_block
+			else:
+				processed_block = self.__des_crypt(block, crypt_type)
+
+
+			# Add the resulting crypted block to our list
+			#d = self.__BitList_to_String(processed_block)
+			#result.append(d)
+			result.append(self.__BitList_to_String(processed_block))
+			#dict[data[i:i+8]] = d
+			i += 8
+
+		# print "Lines: %d, cached: %d" % (lines, cached)
+
+		# Return the full crypted string
+		if _pythonMajorVersion < 3:
+			return ''.join(result)
+		else:
+			return bytes.fromhex('').join(result)
+
+	def encrypt(self, data, pad=None, padmode=None):
+		"""encrypt(data, [pad], [padmode]) -> bytes
+
+		data : Bytes to be encrypted
+		pad  : Optional argument for encryption padding. Must only be one byte
+		padmode : Optional argument for overriding the padding mode.
+
+		The data must be a multiple of 8 bytes and will be encrypted
+		with the already specified key. Data does not have to be a
+		multiple of 8 bytes if the padding character is supplied, or
+		the padmode is set to PAD_PKCS5, as bytes will then added to
+		ensure the be padded data is a multiple of 8 bytes.
+		"""
+		data = self._guardAgainstUnicode(data)
+		if pad is not None:
+			pad = self._guardAgainstUnicode(pad)
+		data = self._padData(data, pad, padmode)
+		return self.crypt(data, des.ENCRYPT)
+
+	def decrypt(self, data, pad=None, padmode=None):
+		"""decrypt(data, [pad], [padmode]) -> bytes
+
+		data : Bytes to be encrypted
+		pad  : Optional argument for decryption padding. Must only be one byte
+		padmode : Optional argument for overriding the padding mode.
+
+		The data must be a multiple of 8 bytes and will be decrypted
+		with the already specified key. In PAD_NORMAL mode, if the
+		optional padding character is supplied, then the un-encrypted
+		data will have the padding characters removed from the end of
+		the bytes. This pad removal only occurs on the last 8 bytes of
+		the data (last data block). In PAD_PKCS5 mode, the special
+		padding end markers will be removed from the data after decrypting.
+		"""
+		data = self._guardAgainstUnicode(data)
+		if pad is not None:
+			pad = self._guardAgainstUnicode(pad)
+		data = self.crypt(data, des.DECRYPT)
+		return self._unpadData(data, pad, padmode)
+
+
+
+#############################################################################
+# 				Triple DES				    #
+#############################################################################
+class triple_des(_baseDes):
+	"""Triple DES encryption/decrytpion class
+
+	This algorithm uses the DES-EDE3 (when a 24 byte key is supplied) or
+	the DES-EDE2 (when a 16 byte key is supplied) encryption methods.
+	Supports ECB (Electronic Code Book) and CBC (Cypher Block Chaining) modes.
+
+	pyDes.des(key, [mode], [IV])
+
+	key  -> Bytes containing the encryption key, must be either 16 or
+	        24 bytes long
+	mode -> Optional argument for encryption type, can be either pyDes.ECB
+		(Electronic Code Book), pyDes.CBC (Cypher Block Chaining)
+	IV   -> Optional Initial Value bytes, must be supplied if using CBC mode.
+		Must be 8 bytes in length.
+	pad  -> Optional argument, set the pad character (PAD_NORMAL) to use
+		during all encrypt/decrpt operations done with this instance.
+	padmode -> Optional argument, set the padding mode (PAD_NORMAL or
+		PAD_PKCS5) to use during all encrypt/decrpt operations done
+		with this instance.
+	"""
+	def __init__(self, key, mode=ECB, IV=None, pad=None, padmode=PAD_NORMAL):
+		_baseDes.__init__(self, mode, IV, pad, padmode)
+		self.setKey(key)
+
+	def setKey(self, key):
+		"""Will set the crypting key for this object. Either 16 or 24 bytes long."""
+		self.key_size = 24  # Use DES-EDE3 mode
+		if len(key) != self.key_size:
+			if len(key) == 16: # Use DES-EDE2 mode
+				self.key_size = 16
+			else:
+				raise ValueError("Invalid triple DES key size. Key must be either 16 or 24 bytes long")
+		if self.getMode() == CBC:
+			if not self.getIV():
+				# Use the first 8 bytes of the key
+				self._iv = key[:self.block_size]
+			if len(self.getIV()) != self.block_size:
+				raise ValueError("Invalid IV, must be 8 bytes in length")
+		self.__key1 = des(key[:8], self._mode, self._iv,
+				  self._padding, self._padmode)
+		self.__key2 = des(key[8:16], self._mode, self._iv,
+				  self._padding, self._padmode)
+		if self.key_size == 16:
+			self.__key3 = self.__key1
+		else:
+			self.__key3 = des(key[16:], self._mode, self._iv,
+					  self._padding, self._padmode)
+		_baseDes.setKey(self, key)
+
+	# Override setter methods to work on all 3 keys.
+
+	def setMode(self, mode):
+		"""Sets the type of crypting mode, pyDes.ECB or pyDes.CBC"""
+		_baseDes.setMode(self, mode)
+		for key in (self.__key1, self.__key2, self.__key3):
+			key.setMode(mode)
+
+	def setPadding(self, pad):
+		"""setPadding() -> bytes of length 1. Padding character."""
+		_baseDes.setPadding(self, pad)
+		for key in (self.__key1, self.__key2, self.__key3):
+			key.setPadding(pad)
+
+	def setPadMode(self, mode):
+		"""Sets the type of padding mode, pyDes.PAD_NORMAL or pyDes.PAD_PKCS5"""
+		_baseDes.setPadMode(self, mode)
+		for key in (self.__key1, self.__key2, self.__key3):
+			key.setPadMode(mode)
+
+	def setIV(self, IV):
+		"""Will set the Initial Value, used in conjunction with CBC mode"""
+		_baseDes.setIV(self, IV)
+		for key in (self.__key1, self.__key2, self.__key3):
+			key.setIV(IV)
+
+	def encrypt(self, data, pad=None, padmode=None):
+		"""encrypt(data, [pad], [padmode]) -> bytes
+
+		data : bytes to be encrypted
+		pad  : Optional argument for encryption padding. Must only be one byte
+		padmode : Optional argument for overriding the padding mode.
+
+		The data must be a multiple of 8 bytes and will be encrypted
+		with the already specified key. Data does not have to be a
+		multiple of 8 bytes if the padding character is supplied, or
+		the padmode is set to PAD_PKCS5, as bytes will then added to
+		ensure the be padded data is a multiple of 8 bytes.
+		"""
+		ENCRYPT = des.ENCRYPT
+		DECRYPT = des.DECRYPT
+		data = self._guardAgainstUnicode(data)
+		if pad is not None:
+			pad = self._guardAgainstUnicode(pad)
+		# Pad the data accordingly.
+		data = self._padData(data, pad, padmode)
+		if self.getMode() == CBC:
+			self.__key1.setIV(self.getIV())
+			self.__key2.setIV(self.getIV())
+			self.__key3.setIV(self.getIV())
+			i = 0
+			result = []
+			while i < len(data):
+				block = self.__key1.crypt(data[i:i+8], ENCRYPT)
+				block = self.__key2.crypt(block, DECRYPT)
+				block = self.__key3.crypt(block, ENCRYPT)
+				self.__key1.setIV(block)
+				self.__key2.setIV(block)
+				self.__key3.setIV(block)
+				result.append(block)
+				i += 8
+			if _pythonMajorVersion < 3:
+				return ''.join(result)
+			else:
+				return bytes.fromhex('').join(result)
+		else:
+			data = self.__key1.crypt(data, ENCRYPT)
+			data = self.__key2.crypt(data, DECRYPT)
+			return self.__key3.crypt(data, ENCRYPT)
+
+	def decrypt(self, data, pad=None, padmode=None):
+		"""decrypt(data, [pad], [padmode]) -> bytes
+
+		data : bytes to be encrypted
+		pad  : Optional argument for decryption padding. Must only be one byte
+		padmode : Optional argument for overriding the padding mode.
+
+		The data must be a multiple of 8 bytes and will be decrypted
+		with the already specified key. In PAD_NORMAL mode, if the
+		optional padding character is supplied, then the un-encrypted
+		data will have the padding characters removed from the end of
+		the bytes. This pad removal only occurs on the last 8 bytes of
+		the data (last data block). In PAD_PKCS5 mode, the special
+		padding end markers will be removed from the data after
+		decrypting, no pad character is required for PAD_PKCS5.
+		"""
+		ENCRYPT = des.ENCRYPT
+		DECRYPT = des.DECRYPT
+		data = self._guardAgainstUnicode(data)
+		if pad is not None:
+			pad = self._guardAgainstUnicode(pad)
+		if self.getMode() == CBC:
+			self.__key1.setIV(self.getIV())
+			self.__key2.setIV(self.getIV())
+			self.__key3.setIV(self.getIV())
+			i = 0
+			result = []
+			while i < len(data):
+				iv = data[i:i+8]
+				block = self.__key3.crypt(iv,    DECRYPT)
+				block = self.__key2.crypt(block, ENCRYPT)
+				block = self.__key1.crypt(block, DECRYPT)
+				self.__key1.setIV(iv)
+				self.__key2.setIV(iv)
+				self.__key3.setIV(iv)
+				result.append(block)
+				i += 8
+			if _pythonMajorVersion < 3:
+				data = ''.join(result)
+			else:
+				data = bytes.fromhex('').join(result)
+		else:
+			data = self.__key3.crypt(data, DECRYPT)
+			data = self.__key2.crypt(data, ENCRYPT)
+			data = self.__key1.crypt(data, DECRYPT)
+		return self._unpadData(data, pad, padmode)
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