passwd-crypto

This Python module provides a simple password manager for securely storing and retrieving encrypted password entries. The passwords are encrypted using the Fernet symmetric encryption scheme. The module includes functionality to derive a Fernet key from a password, initialize a password manager instance, retrieve encrypted passwords, decrypt and read stored passwords, encrypt text, and write new password entries to a file.

Usage

Initialization

from passwd-crypto import Passwd, generate_key_from_password

# Example usage
password = b'MyStrongPassword'
key = generate_key_from_password(password)
filename = 'passwords.txt'

# Initialize a Passwd instance
password_manager = Passwd(filename, key)

Reading Passwords

# Retrieve encrypted passwords from the file
encrypted_passwords = password_manager.getEncryptedPasswds()

# Decrypt and read stored passwords
password_entries = password_manager.read()

Writing Passwords

# Write a new password entry to the file
app_name = 'MyApp'
email_address = 'user@example.com'
user_password = 'SecurePassword123'

password_manager.write(app_name, email_address, user_password)

API Reference

generate_key_from_password(password: bytes) -> Fernet

Generates a Fernet key derived from the provided password.

class Passwd(filename: str, key: bytes) -> None

Initialize a Passwd instance.

• filename (str): The name of the file to store encrypted passwords.
• key (bytes): The Fernet key used for encryption and decryption.

getEncryptedPasswds() -> list[bytes]

Retrieve encrypted passwords from the file.

read() -> list[list[str]]

Decrypt and read stored passwords from the file. Returns a list of decrypted password entries, where each entry is a list with the format [App, Email, Password].

encrypt(text: str) -> bytes

Encrypt the given text using the Fernet key.

• text (str): The text to be encrypted.

write(app: str, email: str, password: str) -> None

Encrypt and write a new password entry to the file.

• app (str): The application or service name.
• email (str): The associated email address.
• password (str): The password for the application or service.

Security Note

Adjust the number of iterations in the key derivation process (iterations parameter in generate_key_from_password) based on your security requirements. Higher iterations increase security but also result in longer key derivation times.