Python decrypting using cryptography adds random characters

Question

So im storing passwords and usernames in separate files, and i want to decrypt them and check them, but whenever i decrypt the words, it adds characters to the original words:

def checkLogin(usernameInput, passwordInput, key, Usr):
    f = Fernet(key)
    with open("username.csv", "rb") as file:
                encryptedUsername = file.read()
    decryptedUsername = f.decrypt(encryptedUsername)
    with open("password.csv", "rb") as file:
                encryptedPassword = file.read()
    decryptedPassword = f.decrypt(encryptedPassword)
    print(decryptedPassword)
    print(decryptedUsername)
    usernameInput = usernameInput.get()
    passwordInput = passwordInput.get()

the original Username and passwords were: "Admin" and "SecurePassword" when i print the decrypted strings it returns: "b'SecurePassword '"and "b'Admin'"

Answer 1

You haven't really showed examples of the files to provide an idea of why additional characters are getting added, so I'll just provide a quick fix solution in Python. You can remove the "b'", the " ", and the " " by using strip() after converting usernameInput and passwordInput to a string:

usernameInput = usernameInput.get().decode("utf-8").strip("
").strip("
")
passwordInput = passwordInput.get().decode("utf-8").strip("
").strip("
")

strip() basically removes the parameter provided at the beginning and end of a string, and decode() converts the variables to strings.