decrypt.py

from cryptography.fernet import Fernet
from flask import Flask, render_template, request, send_file

# The Fernet key used to encrypt and decrypt the file
KEY = b"CvmWpLYqG_3dCc8YrVWHV2M4-nG3lTsUjCsFtJt7j6M="

app = Flask(__name__)


@app.route("/")
def index():
    return render_template("index.html")


@app.route("/decrypt", methods=["POST"])
def decrypt():
    filename = request.form["filename"]
    # Read the encrypted data from the file
    with open(f"encrypt/{filename}", "rb") as f:
        encrypted_data = f.read()

    # Decrypt the data using the Fernet key
    fernet = Fernet(KEY)
    decrypted_data = fernet.decrypt(encrypted_data)

    # Write the decrypted data to a new file in the Downloads directory
    with open(f"Downloads/{filename}", "wb") as f:
        f.write(decrypted_data)

    # Send the decrypted file to the user
    return send_file(f"Downloads/{filename}", as_attachment=True)


if __name__ == "__main__":
    app.run(debug=True)