Generate Hashes with Python GUI | Learn Hashing with hashlib

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Table of Contents

1. Introduction
2. Importing Libraries
3. Creating the Hash Generator Class
4. Setting Up the Colors
5. Creating the Main Frame
6. Adding the Title Label
7. Creating the "Select File" Button
8. Function to Select File
9. Calculating the Hashes
10. Rendering the Results
11. Creating the Results Frame
12. Adding the Title for Results
13. Generating the Hash Labels
14. Creating the Hash Entry Boxes
15. Finalizing the GUI and Running the Program

Introduction

In this article, we will be creating a Python hash generator with a graphical user interface using the TKinter library. The hash generator will allow users to select a file and calculate the hashes for that file using various algorithms. We will be using the TKinter library to Create the graphical user interface, and the hashlib library to calculate the hashes. So let's get started!

Importing Libraries

To begin, we need to import the necessary libraries for our project. We will be using the TKinter library for creating the GUI and the hashlib library for calculating the hashes. Additionally, we will also import the file dialogue module from TKinter for selecting the file.

import tkinter as tk
from tkinter import filedialog
import hashlib

Pros:

• The necessary libraries are imported for the project.

Cons:

• None.

Creating the Hash Generator Class

Next, we will create a class called "HashGenerator" to house our hash generation functionality. Using a class allows for better organization of the code and provides a structured approach to building the application. If You are unfamiliar with classes, I recommend reviewing a tutorial on the topic to gain a better understanding.

class HashGenerator:
    def __init__(self, root):
        pass

Pros:

• The HashGenerator class is created as a blueprint for our hash generator application.

Cons:

• None.

Setting Up the Colors

To make the application visually appealing, we will define some variables to store the colors that will be used in our GUI. By using variables for colors, we can easily customize the application by changing the values of these variables.

        self.background_color = '#05499D'
        self.foreground_color = 'white'
        self.button_bg_color = '#07464B'
        self.button_fg_color = 'white'

Pros:

• Color variables are defined for easy customization of the application.

Cons:

• None.

Creating the Main Frame

The main frame is the primary container for all the widgets in our application. We will create an instance of the TKinter Frame class and configure it to fill the window. This will serve as the main container for all other widgets.

        self.main_frame = tk.Frame(root, bg=self.background_color)
        self.main_frame.pack(fill=tk.BOTH, expand=True)
        self.main_frame.columnconfigure(0, weight=1)
        self.main_frame.rowconfigure(1, weight=1)

Pros:

• The main frame is created and configured to fill the window.

Cons:

• None.

Adding the Title Label

Now, let's create a label widget to display the title of our application. This label will serve as the heading for our hash generator. We will customize the label by setting the background and foreground colors, as well as the font and text.

        self.title_label = tk.Label(self.main_frame, text='Hash Generator', 
                                    bg=self.background_color, fg=self.foreground_color, 
                                    font=('Arial', 20))
        self.title_label.grid(row=0, column=0, padx=20, pady=20)

Pros:

• The title label is created and placed in the main frame.

Cons:

• None.

Creating the "Select File" Button

To allow users to select a file for hashing, we will create a button widget. This button will open a file dialog box when clicked, allowing the user to choose a file for hashing. We will customize the button by setting the background and foreground colors, as well as the size and appearance.

        self.select_button = tk.Button(self.main_frame, text='Select File', 
                                       bg=self.button_bg_color, fg=self.button_fg_color, 
                                       width=20, height=4, cursor='hand1')
        self.select_button.grid(row=1, column=0)
        self.select_button.config(command=self.select_file)

Pros:

• The select file button is created and placed in the main frame.

Cons:

• None.

Function to Select File

Now, let's define a function called "select_file" that will be called when the select button is clicked. This function will open a file dialog box for the user to choose a file. We will use the filedialog.askopenfilename() function from TKinter for this purpose.

    def select_file(self):
        file_path = filedialog.askopenfilename()
        if file_path:
            self.calculate_hashes(file_path)

Pros:

• The select_file function is defined to handle the file selection process.

Cons:

• None.

Calculating the Hashes

To calculate the hashes for the selected file, we will define a function called "calculate_hashes". This function will take the selected file path as input and use the hashlib library to calculate the hashes. We will calculate the hashes using several algorithms (e.g., MD5, SHA1) for a comprehensive result.

    def calculate_hashes(self, file_path):
        with open(file_path, 'rb') as file:
            for hash_object in ['md5', 'sha1', 'sha256', 'sha512']:
                hash_instance = hashlib.new(hash_object)
                for line in file:
                    hash_instance.update(line)
                self.render_results(hash_object, hash_instance.hexdigest())

Pros:

• The calculate_hashes function is defined to calculate the hashes for the selected file.

Cons:

• None.

Rendering the Results

After calculating the hashes, we need to display the results to the user in the GUI. To achieve this, we will define a function called "render_results" that will take the hash object (e.g., MD5, SHA1) and the corresponding hash value as input. This function will create labels and entry fields to display the hash results.

    def render_results(self, hash_name, hash_value):
        # Create label for hash name
        hash_label = tk.Label(self.results_frame, bg=self.background_color, fg=self.foreground_color,
                              font=('Arial', 13), text=hash_name, anchor='w')
        # Create read-only entry for hash value
        hash_entry = tk.Entry(self.results_frame, bg='white', fg='black', font=('Arial', 13),
                              highlightthickness=0, bd=0, justify='left', state='readonly')
        # Insert hash value into entry
        hash_entry.insert(tk.END, hash_value)

        # Grid placement for label and entry
        hash_label.grid(row=self.result_index, column=0, pady=10, sticky='w')
        hash_entry.grid(row=self.result_index, column=1, padx=20, pady=10, sticky='ew')

        self.result_index += 1

Pros:

• The render_results function is defined to display the calculated hash results in the GUI.

Cons:

• None.

Creating the Results Frame

To contain the hash results, we will create a new frame called "results_frame" as a child of the main frame. This frame will serve as the container for the hash labels and entry fields that display the results. We will configure the frame and set the appearance using the defined colors.

        self.results_frame = tk.Frame(self.main_frame, bg=self.background_color)
        self.results_frame.grid(row=2, column=0, sticky='nsew')
        self.results_frame.columnconfigure(0, weight=1)

        # Variable to keep track of result row index
        self.result_index = 0

Pros:

• The results frame is created and placed in the main frame.

Cons:

• None.

Adding the Title for Results

Next, we will create a label widget to display the title for the hash results. This label will serve as the heading for the results section and will be placed at the top of the results frame. The appearance of the label will be customized using the defined colors.

        self.results_title = tk.Label(self.results_frame, bg=self.background_color, 
                                      fg=self.foreground_color, font=('Arial', 17, 'bold'),
                                      text='Results')
        self.results_title.grid(row=0, column=0, pady=20)

Pros:

• The results title label is created and placed in the results frame.

Cons:

• None.

Generating the Hash Labels

After creating the results frame, we can proceed to generate the hash labels dynamically. We will loop through the hash objects and create a label for each in the results frame. The hash object name will serve as the text for the label.

        for hash_object in ['md5', 'sha1', 'sha256', 'sha512']:
            self.create_hash_label(hash_object)

Pros:

• The hash labels are generated dynamically Based on the hash objects.

Cons:

• None.

Creating the Hash Entry Boxes

To display the hash values, we will create entry fields in the results frame. These entry fields will be Read-only and contain the hash values as calculated using the hashlib library. We will loop through the hash objects and create an entry field for each in the results frame.

        for hash_object in ['md5', 'sha1', 'sha256', 'sha512']:
            self.create_hash_entry(hash_object)

Pros:

• The hash entry boxes are generated dynamically based on the hash objects.

Cons:

• None.

Finalizing the GUI and Running the Program

Finally, we will add the finishing touches to our GUI by configuring the window size, disabling window resizing, and starting the main event loop.

root = tk.Tk()
root.title('Hash Generator')
root.geometry('900x550')
root.resizable(width=False, height=False)

hash_generator_app = HashGenerator(root)

root.mainloop()

Pros:

• The final GUI configuration and program execution steps are implemented.

Cons:

• None.

FAQ

Q: Can I customize the colors used in the application? A: Yes, you can customize the colors by modifying the color variables defined in the code.

Q: What algorithms are available for calculating hashes? A: The application currently supports MD5, SHA1, SHA256, and SHA512 algorithms. These can be easily modified in the code to add or remove algorithms as needed.

Q: Can I calculate hashes for multiple files at once? A: No, the current implementation only supports calculating hashes for a single selected file. However, you can modify the code to handle multiple files if desired.

Q: Can I save the hash results to a file? A: The current implementation does not provide a function to save the hash results to a file. However, you can easily modify the code to incorporate this functionality.

Q: Can I copy the hash values from the entry fields? A: Yes, the entry fields are read-only, but you can still select and copy the hash values using standard text selection and copying methods.

Q: Can I resize the application window? A: No, the window size is fixed and cannot be resized.