FLO Secret app
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saizsassin
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FLO_Secret.py
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215
FLO_Secret.py
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#!/usr/bin/env python3
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from tkinter import *
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from tkinter import messagebox
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from secretsharing import PlaintextToHexSecretSharer
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import base64
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import os
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from Crypto.Cipher import AES
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# This function splits the secret and returns a list of shares
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def splitSecret(secret,threshold,splits):
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#Formatting key inorder to convert bytes of string using base64
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secret = base64.b64encode(secret).decode('utf-8')
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shares = PlaintextToHexSecretSharer.split_secret(secret, threshold, splits)
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return shares
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# This function recovers the secret using the list of shares and returns the reconstructed secret
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def recoverSecret(shares):
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secret = PlaintextToHexSecretSharer.recover_secret(shares)
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#Converting recovered_key to bytes using base64 module
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secret=base64.b64decode(secret)
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return secret
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def pad(data):
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padding = 16 - len(data) % 16
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return data + padding * chr(padding+97)
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def unpad(data):
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data = str(data)
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padding = ord(data[-2]) - 96
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return data[2:-padding]
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def keyGen():
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# Generating random key of 32 bytes
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key = os.urandom(32)
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return key
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def encryptMsg(plaintext, key):
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# Initialization vector in AES should be 16 bytes
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IV = 16 * '\x00'
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# Creation of encryptor and decryptor object using above details
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cipher = AES.new(key, AES.MODE_CBC, IV)
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ciphertext = cipher.encrypt(pad(plaintext))
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ciphertext = base64.b64encode(ciphertext).decode('utf-8')
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return ciphertext
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def decryptMsg(ciphertext, key):
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# Initialization vector in AES should be 16 bytes
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IV = 16 * '\x00'
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# Creation of encryptor and decryptor object using above details
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cipher = AES.new(key, AES.MODE_CBC, IV)
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ciphertext=base64.b64decode(ciphertext)
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return unpad(cipher.decrypt(ciphertext));
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class GUI:
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def __init__(self, root):
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self.root = root
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self.frame = Frame(self.root)
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self.vcmd = (self.frame.register(self.onValidate),
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'%d', '%i', '%P', '%s', '%S', '%v', '%V', '%W')
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#validation for input as integers
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def onValidate(self, d, i, P, s, S, v, V, W):
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ind=int(i)
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if d == '1': #insert
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if not P[ind].isdigit():
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return False
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return True
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def Main(self):
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try:
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self.PostFrame.destroy()
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except:
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None
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try:
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self.GetFrame.destroy()
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except:
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None
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self.MainFrame = Frame(self.root, height=1000,width=500)
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self.MainFrame.pack()
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WelcomeLabel = Label(self.MainFrame,text="Welcome To FLO-Secret App",font=("Arial", 20))
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WelcomeLabel.grid(column = 1, columnspan =2)
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label =Label(self.MainFrame,text=" ")
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label.grid(row = 2, columnspan =2)
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PostButton = Button(self.MainFrame,text="POST",command=self.Post)
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PostButton.grid(row =3,column=1)
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GetButton = Button(self.MainFrame,text="GET",command=self.Get)
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GetButton.grid(row =3, column=2)
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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."
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Context = Message(self.MainFrame, text = contentText)
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Context.grid(column = 1, columnspan =2)
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def Post(self):
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self.MainFrame.destroy()
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self.PostFrame = Frame(self.root)
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self.PostFrame.pack()
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PL1 = Label(self.PostFrame,text="Enter Total Number of shares : ")
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PL1.grid(row=1, column =1)
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self.PE1 = Spinbox(self.PostFrame, from_ = 2, to = 1000, validate="key", validatecommand=self.vcmd)
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self.PE1.grid(row=1, column =2)
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PL2 = Label(self.PostFrame,text="Enter Minimum Number of required shares : ")
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PL2.grid(row=2, column =1)
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self.PE2 = Spinbox(self.PostFrame, from_ = 2, to = 1000, validate="key", validatecommand=self.vcmd)
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self.PE2.grid(row=2, column =2)
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PL3 = Label(self.PostFrame,text="Enter the message to be encrypted")
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PL3.grid(row=3, column =1, columnspan=2)
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PTextFrame = Frame(self.PostFrame)
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self.PTextBox = Text(PTextFrame,height=10,width=50)
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PScroll = Scrollbar(PTextFrame)
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PScroll.config( command = self.PTextBox.yview )
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self.PTextBox.pack(side = LEFT)
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PScroll.pack(side = RIGHT,fill = Y )
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PTextFrame.grid(column=1,columnspan=2)
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PBackButton = Button(self.PostFrame,text="Back",command=self.Main)
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PBackButton.grid(row=5, column =1)
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self.PNextButton = Button(self.PostFrame,text="Submit",command=self.Encryption)
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self.PNextButton.grid(row=5, column =2)
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def Encryption(self):
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splits = int(self.PE1.get())
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threshold = int(self.PE2.get())
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if (threshold > splits) :
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messagebox.showwarning("Invalid", "Total-Shares should be greater than or equal to Minimum-Shares-Required")
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return
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self.PE1.config(state='disabled')
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self.PE2.config(state='disabled')
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self.PTextBox.config(state='disabled')
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key = keyGen()
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plaintext = self.PTextBox.get("1.0",'end-1c')
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shared_key = splitSecret(key,threshold,splits)
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print("Shared Keys="+str(shared_key))
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ciphertext = encryptMsg(plaintext,key)
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print("Encrypted Text : " + ciphertext)
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self.PNextButton.destroy()
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messagebox.showinfo("Successful", "Your message is successfully encrypted!!!")
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def Get(self):
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self.MainFrame.destroy()
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self.GetFrame = Frame(self.root)
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self.GetFrame.pack()
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GL1 = Label(self.GetFrame,text="Enter Number of required shares : ")
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GL1.grid(row=1,column=1)
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self.GE1 = Spinbox(self.GetFrame, from_ = 2, to = 1000, validate="key", validatecommand=self.vcmd)
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self.GE1.grid(row=1,column=2)
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GL2 = Label(self.GetFrame,text="Enter Transaction hash : ")
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GL2.grid(row=2,column=1)
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self.GE2 = Entry(self.GetFrame)
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self.GE2.grid(row=2,column=2)
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self.GFindButton = Button(self.GetFrame,text="Find Secret",command=self.GetSharedKey)
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self.GFindButton.grid(row=3,column=2)
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self.GBackButton=Button(self.GetFrame,text="Back",command=self.Main)
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self.GBackButton.grid(row=3,column=1)
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def GetSharedKey(self):
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self.numOfShares = int(self.GE1.get())
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self.GFindButton.destroy()
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self.GBackButton.destroy()
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self.GE1.config(state='disabled')
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self.GE2.config(state='disabled')
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GLArray = [None] * self.numOfShares
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self.GEArray = [None] * self.numOfShares
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for i in range(self.numOfShares):
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GLArray[i] = Label(self.GetFrame, text="Shared key #"+str(i+1))
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GLArray[i].grid(column=1)
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self.GEArray[i] = Entry(self.GetFrame)
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self.GEArray[i].grid(column=2)
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self.GBackButton=Button(self.GetFrame,text="Back",command=self.Main)
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self.GBackButton.grid(column=1)
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self.GDecryptButton = Button(self.GetFrame,text="Decrypt",command=self.DecryptMsg)
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self.GDecryptButton.grid(column=2)
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def DecryptMsg(self):
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ciphertext = self.GE2.get()
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shares = [None] * self.numOfShares
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for i in range(self.numOfShares):
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shares[i] = self.GEArray[i].get()
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try:
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key=recoverSecret(shares)
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plaintext = decryptMsg(ciphertext,key)
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except:
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messagebox.showerror("Error", "Decryption Failed!!! Please insert the correct shared keys!")
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return
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for i in range(self.numOfShares):
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shares[i] = self.GEArray[i].config(state='disabled')
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self.GDecryptButton.destroy()
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self.GBackButton.destroy()
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GL3 = Label(self.GetFrame, text="Found Secret Message")
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GL3.grid(column=1, columnspan=2)
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GTextFrame = Frame(self.GetFrame)
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GLMsg = Text(GTextFrame,height=10,width=50)
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GLMsg.insert(INSERT, plaintext)
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GLMsg.config(state='disabled')
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GScroll = Scrollbar(GTextFrame)
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GScroll.config( command = GLMsg.yview )
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GLMsg.pack(side = LEFT)
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GScroll.pack(side = RIGHT,fill = Y)
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GTextFrame.grid(column=1,columnspan=2)
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self.GBackButton=Button(self.GetFrame,text="Back",command=self.Main)
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self.GBackButton.grid(column=1)
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root = Tk()
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root.title("FloSecret")
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gui = GUI(root)
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gui.Main()
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root.mainloop()
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