cifradortexto.py

import tkinter as tk

FONT = ("calbri", 20, "bold")


class CaesarCipherGUI:
    def __init__(self, master):
        master.title("Cifrado de texto")
        self.plaintext = tk.StringVar(master, value="")
        self.ciphertext = tk.StringVar(master, value="")
        self.key = tk.IntVar(master)

        # Plaintext controls
        self.plain_label = tk.Label(master, text="Texto plano", fg="green", font=FONT).grid(row=0, column=0)
        self.plain_entry = tk.Entry(master,
                                    textvariable=self.plaintext, width=50, font=FONT)
        self.plain_entry.grid(row=0, column=1, padx=20)
        self.encrypt_button = tk.Button(master, text="Cifrar",
                                        command=lambda: self.encrypt_callback(), font=FONT).grid(row=0, column=2)
        self.plain_clear = tk.Button(master, text="Borrar",
                                     command=lambda: self.clear('plain'), font=FONT).grid(row=0, column=3)

        # Key controls
        self.key_label = tk.Label(master, text="Clave", font=FONT).grid(row=1, column=0)
        self.key_entry = tk.Entry(master, textvariable=self.key, width=10, font=FONT).grid(row=1, column=1,
                                                                                           sticky=tk.W, padx=20)

        # Ciphertext controls
        self.cipher_label = tk.Label(master, text="Texto cifrado", fg="red", font=FONT).grid(row=2, column=0)
        self.cipher_entry = tk.Entry(master,
                                     textvariable=self.ciphertext, width=50, font=FONT)
        self.cipher_entry.grid(row=2, column=1, padx=20)
        self.decrypt_button = tk.Button(master, text="Descifrar",
                                        command=lambda: self.decrypt_callback(), font=FONT).grid(row=2, column=2)
        self.cipher_clear = tk.Button(master, text="Borrar",
                                      command=lambda: self.clear('cipher'), font=FONT).grid(row=2, column=3)

    def clear(self, str_val):
        if str_val == 'cipher':
            self.cipher_entry.delete(0, 'end')
        elif str_val == 'plain':
            self.plain_entry.delete(0, 'end')

    def get_key(self):
        try:
            key_val = self.key.get()
            return key_val
        except tk.TclError:
            pass

    def encrypt_callback(self):
        key = self.get_key()
        ciphertext = encrypt(self.plain_entry.get(), key)
        self.cipher_entry.delete(0, tk.END)
        self.cipher_entry.insert(0, ciphertext)

    def decrypt_callback(self):
        key = self.get_key()
        plaintext = decrypt(self.cipher_entry.get(), key)
        self.plain_entry.delete(0, tk.END)
        self.plain_entry.insert(0, plaintext)


def encrypt(plaintext, key):
    ciphertext = ""
    for char in plaintext.upper():
        if char.isalpha():
            ciphertext += chr((ord(char) + key - 65) % 26 + 65)
        else:
            ciphertext += char
    return ciphertext


def decrypt(ciphertext, key):
    plaintext = ""
    for char in ciphertext.upper():
        if char.isalpha():
            plaintext += chr((ord(char) - key - 65) % 26 + 65)
        else:
            plaintext += char
    return plaintext


if __name__ == "__main__":
    root = tk.Tk()
    caesar = CaesarCipherGUI(root)
    root.mainloop()