encode-decode.py

from tkinter import *
import base64

# initalize window

root = Tk()

root.geometry('500x300')
root.resizable(0, 0)
root.title("Message Encode and Decode")

Label(root, text='ENCODE DECODE', font='arial 20 bold').pack()
Label(root, text='Anurag', font='arial 20 bold').pack(side=BOTTOM)

# define variables

Text = StringVar()
private_key = StringVar()
mode = StringVar()
Result = StringVar()


#  defining functions to encode
def Encode(key, message):
    enc = []

    for i in range(len(message)):
        key_c = key[i % len(key)]
        enc.append(chr((ord(message[i]) + ord(key_c)) % 256))
        return base64.urlsafe_b64encode("".join(enc).encode()).decode()


# function to decode

def Decode(key, message):
    dec = []
    message = base64.urlsafe_b64decode(message).decode()

    for i in range(len(message)):
        key_c = key[i % len(key)]
        dec.append(chr((256 + ord(message[i]) - ord(key_c)) % 256))
        return "".join(dec)


# function to set mode

def Mode():
    if (mode.get() == 'e'):
        Result.set(Encode(private_key.get(), Text.get()))
    elif (mode.get() == 'd'):
        Result.set(Decode(private_key.get(), Text.get()))

    else:
        Result.set('Invalid Mode')


# Function to exit window

def Exit():
    root.destroy()


# Function to reset window

def Reset():
    Text.set(" ")
    private_key.set(" ")
    mode.set(" ")
    Result.set(" ")


# Labels and Buttons
Label(root, font='arial 12 bold', text='MESSAGE').place(x=60, y=60)
Entry(root, font='arial 10', textvariable=Text, bg='ghost white').place(x=290, y=60)

Label(root, font='arial 12 bold', text='KEY').place(x=60, y=90)
Entry(root, font='arial 10', textvariable=private_key, bg='ghost white').place(x=290, y=90)

Label(root, font='arial 12 bold', text = 'MODE(-encode, d-decode)').place(x=60, y=120)
Entry(root, font='arial 10', textvariable = mode, bg='ghost white').place(x=290, y=120)

Entry(root, font='arial 10 bold', textvariable = Result, bg='ghost white').place(x=290, y=150)

Button(root, font='arial 10 bold', text = 'RESULT',width=6, padx=2, bg='LightGray', command = Mode).place(x=60, y=190)

Button(root, font='arial 10 bold', text='RESET', width=6, command=Reset, bg='LightGreen', padx=2).place(x=120, y=190)

Button(root, font='arial 10 bold', text='EXIT', width=6, command=Exit, bg='OrangeRed', padx=2, pady=2).place(x=180,
                                                                                                             y=190)

root.mainloop()