289 lines
12 KiB
Python
Executable File
289 lines
12 KiB
Python
Executable File
#!/usr/bin/env python3
|
|
from tkinter import *
|
|
from tkinter import messagebox
|
|
from secretsharing import PlaintextToHexSecretSharer
|
|
import base64
|
|
import os
|
|
from Crypto.Cipher import AES
|
|
import subprocess
|
|
from more_itertools import sliced
|
|
import json
|
|
|
|
|
|
###Utility function###
|
|
|
|
# This function splits the secret and returns a list of shares
|
|
def splitSecret(secret,threshold,splits):
|
|
#Formatting key inorder to convert bytes of string using base64
|
|
secret = base64.b64encode(secret).decode('utf-8')
|
|
shares = PlaintextToHexSecretSharer.split_secret(secret, threshold, splits)
|
|
for i in range(splits):
|
|
shares[i]=base64.b64encode(shares[i].encode('utf-8')).decode('utf-8')
|
|
return shares
|
|
|
|
# This function recovers the secret using the list of shares and returns the reconstructed secret
|
|
def recoverSecret(shares):
|
|
for i in range(len(shares)):
|
|
shares[i] = (base64.b64decode(shares[i])).decode('utf-8')
|
|
secret = PlaintextToHexSecretSharer.recover_secret(shares)
|
|
#Converting recovered_key to bytes using base64 module
|
|
secret=base64.b64decode(secret)
|
|
return secret
|
|
|
|
def pad(data):
|
|
padding = 16 - len(data) % 16
|
|
return data + padding * chr(padding+97)
|
|
|
|
def unpad(data):
|
|
data = str(data)
|
|
padding = ord(data[-2]) - 96
|
|
return data[2:-padding]
|
|
|
|
def keyGen():
|
|
# Generating random key of 32 bytes
|
|
key = os.urandom(32)
|
|
return key
|
|
|
|
|
|
def encryptMsg(plaintext, key):
|
|
# Genarating Initialization vector for AES (16 bytes)
|
|
IV = os.urandom(16)
|
|
# Encrypting The plaintext
|
|
cipher = AES.new(key, AES.MODE_CBC, IV)
|
|
plaintext=base64.b64encode(plaintext.encode('utf-8')).decode('utf-8')
|
|
ciphertext = cipher.encrypt(pad(plaintext))
|
|
# Append IV and Ciphertext
|
|
ciphertext = base64.b64encode(IV).decode('utf-8') + base64.b64encode(ciphertext).decode('utf-8')
|
|
return ciphertext
|
|
|
|
|
|
def decryptMsg(ciphertext, key):
|
|
# Initialization vector in AES should be 16 bytes
|
|
IV = base64.b64decode(ciphertext[:24])
|
|
ciphertext=base64.b64decode(ciphertext[24:])
|
|
# Creation of encryptor and decryptor object using above details
|
|
cipher = AES.new(key, AES.MODE_CBC, IV)
|
|
plaintext=unpad(cipher.decrypt(ciphertext));
|
|
plaintext = (base64.b64decode(plaintext)).decode('utf-8')
|
|
return plaintext
|
|
|
|
def writeUnitToBlockchain(text,receiver):
|
|
txid = subprocess.check_output(["flo-cli","--testnet", "sendtoaddress",receiver,"0.01",'""','""',"true","false","10",'UNSET',str(text)])
|
|
txid = str(txid)
|
|
txid = txid[2:-3]
|
|
return txid
|
|
|
|
def readUnitFromBlockchain(txid):
|
|
rawtx = subprocess.check_output(["flo-cli","--testnet", "getrawtransaction", str(txid)])
|
|
rawtx = str(rawtx)
|
|
rawtx = rawtx[2:-3]
|
|
tx = subprocess.check_output(["flo-cli","--testnet", "decoderawtransaction", str(rawtx)])
|
|
content = json.loads(tx)
|
|
text = content['floData']
|
|
return text
|
|
|
|
def writeDatatoBlockchain(text):
|
|
n_splits = len(text)//350 + 1 #number of splits to be created
|
|
splits = list(sliced(text, 350)) #create a sliced list of strings
|
|
#for split in splits:
|
|
# print(split)
|
|
#print('no.of splits: '+str(n_splits))
|
|
tail = writeUnitToBlockchain(splits[n_splits-1],'oV9ZoREBSV5gFcZTBEJ7hdbCrDLSb4g96i') #create a transaction which will act as a tail for the data
|
|
cursor = tail
|
|
if n_splits == 1:
|
|
return cursor #if only single transaction was created then tail is the cursor
|
|
|
|
#for each string in the list create a transaction with txid of previous string
|
|
for i in range(n_splits-2,-1,-1):
|
|
splits[i] = 'next:'+cursor+" "+splits[i]
|
|
#print(splits[i])
|
|
cursor = writeUnitToBlockchain(splits[i],'oV9ZoREBSV5gFcZTBEJ7hdbCrDLSb4g96i')
|
|
return cursor
|
|
|
|
def readDatafromBlockchain(cursor):
|
|
text = []
|
|
cursor_data = readUnitFromBlockchain(cursor)
|
|
while(cursor_data[:5]=='next:'):
|
|
cursor = cursor_data[5:69]
|
|
#print("fetching this transaction->>"+cursor)
|
|
text.append(cursor_data[70:])
|
|
cursor_data = readUnitFromBlockchain(cursor)
|
|
text.append(cursor_data)
|
|
#print(text)
|
|
text=('').join(text)
|
|
return text
|
|
|
|
|
|
###START OF GUI###
|
|
|
|
|
|
|
|
class GUI:
|
|
|
|
def __init__(self, root):
|
|
self.root = root
|
|
self.frame = Frame(self.root)
|
|
self.vcmd = (self.frame.register(self.onValidate),
|
|
'%d', '%i', '%P', '%s', '%S', '%v', '%V', '%W')
|
|
|
|
#validation for input as integers
|
|
def onValidate(self, d, i, P, s, S, v, V, W):
|
|
ind=int(i)
|
|
if d == '1': #insert
|
|
if not P[ind].isdigit():
|
|
return False
|
|
return True
|
|
|
|
|
|
def Main(self):
|
|
try:
|
|
self.PostFrame.destroy()
|
|
except:
|
|
None
|
|
try:
|
|
self.GetFrame.destroy()
|
|
except:
|
|
None
|
|
self.MainFrame = Frame(self.root, height=1000,width=500)
|
|
self.MainFrame.pack()
|
|
WelcomeLabel = Label(self.MainFrame,text="Welcome To FLO-Secret App",font=("Arial", 20))
|
|
WelcomeLabel.grid(column = 1, columnspan =2)
|
|
label =Label(self.MainFrame,text=" ")
|
|
label.grid(row = 2, columnspan =2)
|
|
PostButton = Button(self.MainFrame,text="POST",command=self.Post)
|
|
PostButton.grid(row =3,column=1)
|
|
GetButton = Button(self.MainFrame,text="GET",command=self.Get)
|
|
GetButton.grid(row =3, column=2)
|
|
contentText = "\n\nWhat is this?\n\tThis app let you save encrypted secret in the FLO blockchain and produces a number of keys that must be combined to be able to decrypt the secret.\n\nThis is a zero knowledge application.\n\tThe creation of the master key and shared keys and the encryption of the secret with the main key happens in the app. The app then sends the encrypted information to be posted in the FLO blockchain. This is the only information sent to our servers. The server reply with the hash of the transaction and the app produces the pdf containing information about the shares and the transaction.\n\nHow to encrypt an information? \n\tCurrently, we are only supporting messages typed or copied to a text area. Click in POST, select the number of total shares and the number of required shares, type or paste the information and click Submit.\n\nHow to decrypt a secret?\n\tClick in GET, type the number of minimum required shares and the hash of the transaction and press Find secret. Then insert the hash of each share and click decrypt. If everything is ok, you should be able to see the decrypted information."
|
|
Context = Message(self.MainFrame, text = contentText)
|
|
Context.grid(column = 1, columnspan =2)
|
|
|
|
def Post(self):
|
|
self.MainFrame.destroy()
|
|
self.PostFrame = Frame(self.root)
|
|
self.PostFrame.pack()
|
|
PL1 = Label(self.PostFrame,text="Enter Total Number of shares : ")
|
|
PL1.grid(row=1, column =1)
|
|
self.PE1 = Spinbox(self.PostFrame, from_ = 2, to = 1000, validate="key", validatecommand=self.vcmd)
|
|
self.PE1.grid(row=1, column =2)
|
|
PL2 = Label(self.PostFrame,text="Enter Minimum Number of required shares : ")
|
|
PL2.grid(row=2, column =1)
|
|
self.PE2 = Spinbox(self.PostFrame, from_ = 2, to = 1000, validate="key", validatecommand=self.vcmd)
|
|
self.PE2.grid(row=2, column =2)
|
|
PL3 = Label(self.PostFrame,text="Enter the message to be encrypted")
|
|
PL3.grid(row=3, column =1, columnspan=2)
|
|
PTextFrame = Frame(self.PostFrame)
|
|
self.PTextBox = Text(PTextFrame,height=10,width=50)
|
|
PScroll = Scrollbar(PTextFrame)
|
|
PScroll.config( command = self.PTextBox.yview )
|
|
self.PTextBox.pack(side = LEFT)
|
|
PScroll.pack(side = RIGHT,fill = Y )
|
|
PTextFrame.grid(column=1,columnspan=2)
|
|
PBackButton = Button(self.PostFrame,text="Back",command=self.Main)
|
|
PBackButton.grid(row=5, column =1)
|
|
self.PNextButton = Button(self.PostFrame,text="Submit",command=self.Encryption)
|
|
self.PNextButton.grid(row=5, column =2)
|
|
|
|
def Encryption(self):
|
|
splits = int(self.PE1.get())
|
|
threshold = int(self.PE2.get())
|
|
if (threshold > splits or threshold<2) :
|
|
messagebox.showwarning("Invalid!", "Minimum-Shares-Required should be greater than 2 and lesser than or equal to Total-Shares ")
|
|
return
|
|
self.PE1.config(state='disabled')
|
|
self.PE2.config(state='disabled')
|
|
self.PTextBox.config(state='disabled')
|
|
key = keyGen()
|
|
plaintext = self.PTextBox.get("1.0",'end-1c')
|
|
shared_key = splitSecret(key,threshold,splits)
|
|
ciphertext = encryptMsg(plaintext,key)
|
|
try:
|
|
txid = writeDatatoBlockchain(ciphertext)
|
|
except:
|
|
messagebox.showerror("Connection Failed!", "Please run the node(Flo-Core)!")
|
|
return
|
|
print("Shared Keys="+str(shared_key))
|
|
print('txid: ',txid)
|
|
self.PNextButton.destroy()
|
|
messagebox.showinfo("Successful!", "Your data is successfully encrypted and stored in the FLO Blockchain!")
|
|
|
|
|
|
|
|
def Get(self):
|
|
self.MainFrame.destroy()
|
|
self.GetFrame = Frame(self.root)
|
|
self.GetFrame.pack()
|
|
GL1 = Label(self.GetFrame,text="Enter Number of required shares : ")
|
|
GL1.grid(row=1,column=1)
|
|
self.GE1 = Spinbox(self.GetFrame, from_ = 2, to = 1000, validate="key", validatecommand=self.vcmd)
|
|
self.GE1.grid(row=1,column=2)
|
|
GL2 = Label(self.GetFrame,text="Enter Transaction hash : ")
|
|
GL2.grid(row=2,column=1)
|
|
self.GE2 = Entry(self.GetFrame)
|
|
self.GE2.grid(row=2,column=2)
|
|
txid = self.GE2.get()
|
|
self.GFindButton = Button(self.GetFrame,text="Find Secret",command=self.GetSharedKey)
|
|
self.GFindButton.grid(row=3,column=2)
|
|
self.GBackButton=Button(self.GetFrame,text="Back",command=self.Main)
|
|
self.GBackButton.grid(row=3,column=1)
|
|
|
|
def GetSharedKey(self):
|
|
try:
|
|
txid = self.GE2.get()
|
|
self.ciphertext = readDatafromBlockchain(txid)
|
|
except:
|
|
messagebox.showerror("Data retrieval Failed!", "Please enter valid transaction hash!\nAlso run the node(Flo-Core)!")
|
|
return
|
|
self.numOfShares = int(self.GE1.get())
|
|
self.GFindButton.destroy()
|
|
self.GBackButton.destroy()
|
|
self.GE1.config(state='disabled')
|
|
self.GE2.config(state='disabled')
|
|
GLArray = [None] * self.numOfShares
|
|
self.GEArray = [None] * self.numOfShares
|
|
for i in range(self.numOfShares):
|
|
GLArray[i] = Label(self.GetFrame, text="Shared key #"+str(i+1))
|
|
GLArray[i].grid(column=1)
|
|
self.GEArray[i] = Entry(self.GetFrame)
|
|
self.GEArray[i].grid(column=2)
|
|
self.GBackButton=Button(self.GetFrame,text="Back",command=self.Main)
|
|
self.GBackButton.grid(column=1)
|
|
self.GDecryptButton = Button(self.GetFrame,text="Decrypt",command=self.DecryptMsg)
|
|
self.GDecryptButton.grid(column=2)
|
|
|
|
def DecryptMsg(self):
|
|
shares = [None] * self.numOfShares
|
|
for i in range(self.numOfShares):
|
|
shares[i] = self.GEArray[i].get()
|
|
try:
|
|
key=recoverSecret(shares)
|
|
plaintext = decryptMsg(self.ciphertext,key)
|
|
except:
|
|
messagebox.showerror("Decryption Failed!", "Please enter the correct shared keys!")
|
|
return
|
|
for i in range(self.numOfShares):
|
|
shares[i] = self.GEArray[i].config(state='disabled')
|
|
self.GDecryptButton.destroy()
|
|
self.GBackButton.destroy()
|
|
GL3 = Label(self.GetFrame, text="Found Secret Message")
|
|
GL3.grid(column=1, columnspan=2)
|
|
GTextFrame = Frame(self.GetFrame)
|
|
self.GLMsg = Text(GTextFrame,height=10,width=50)
|
|
self.GLMsg.insert(END, plaintext)
|
|
self.GLMsg.config(state='disabled')
|
|
GScroll = Scrollbar(GTextFrame)
|
|
GScroll.config( command = self.GLMsg.yview )
|
|
self.GLMsg.pack(side = LEFT)
|
|
GScroll.pack(side = RIGHT,fill = Y)
|
|
GTextFrame.grid(column=1,columnspan=2)
|
|
self.GBackButton=Button(self.GetFrame,text="Back",command=self.Main)
|
|
self.GBackButton.grid(column=1)
|
|
|
|
root = Tk()
|
|
root.title("FloSecret")
|
|
gui = GUI(root)
|
|
gui.Main()
|
|
root.mainloop()
|
|
|
|
|