Update project configuration and dependencies

.bandit.yml

@@ -0,0 +1,9 @@
+exclude_dirs:
+  - .git
+  - .tox
+  - "tests/*"
+  - build
+  - dist
+
+skips:
+  - B101

README.md

@@ -1,3 +1,4 @@
+<!-- markdownlint-disable MD033 MD041 -->
 <p align="center">
   <img src="https://www.hsbc.com/-/files/hsbc/header/hsbc-logo-200x25.svg" alt="HSBC Logo" width="200" title="HSBC Logo">
 </p>
@@ -9,7 +10,7 @@
 </p>
 
 <p align="center">
-  <strong>A Python CLI application for generating RSA public and private key pairs using PyCryptodome</strong>
+  <strong>A Python CLI application for generating RSA public and private key pairs using the cryptography library</strong>
 </p>
 
 <p align="center">
@@ -20,10 +21,11 @@
   <a href="#development">Development</a> •
   <a href="#license">License</a>
 </p>
+<!-- markdownlint-enable MD033 MD041 -->
 
 ## Features
 
-Encryption Helper is a robust Python package designed to simplify the process of creating RSA key pairs. It leverages the PyCryptodome library to offer:
+Encryption Helper is a robust Python package designed to simplify the process of creating RSA key pairs. It leverages the [cryptography][0] library to offer:
 
 - Generation of 2048-bit RSA key pairs
 - Automatic saving of keys in PEM format
@@ -32,7 +34,7 @@ Encryption Helper is a robust Python package designed to simplify the process of
 
 ## Installation
 
-This package requires Python 3.8 or later and uses PyCryptodome for cryptographic operations.
+This package requires Python 3.8 or later and uses cryptography for cryptographic operations.
 
 ### Using Poetry (recommended)
 
@@ -43,7 +45,7 @@ Ensure you have Poetry installed, then follow these steps:
 git clone https://github.com/hsbc/encryption-helper-python.git
 cd encryption-helper-python
 
-# Install dependencies (including PyCryptodome)
+# Install dependencies (including cryptography)
 poetry install
 ```
 
@@ -60,7 +62,7 @@ cd encryption-helper-python
 python -m venv venv
 source venv/bin/activate  # On Windows use `venv\Scripts\activate`
 
-# Install the package and its dependencies (including PyCryptodome)
+# Install the package and its dependencies (including cryptography)
 pip install .
 ```
 
@@ -91,21 +93,21 @@ python -m encryption_helper
 
 These commands will:
 
-- Use PyCryptodome to generate a 2048-bit RSA key pair
+- Use cryptography to generate a 2048-bit RSA key pair
 - Save the private key to `keys/pem/private-key.pem`
 - Save the public key to `keys/pem/public-key.pem`
 - Display both keys in the console
 - Log the key generation process
 
 ## Configuration
 
-The key generation process uses PyCryptodome with the following specifications:
+The key generation process uses cryptography with the following specifications:
 
 - Standard: PKCS#1
 - Type: RSA
 - Size: 2048 bits
 
-To modify these settings, you'll need to edit the `generate_rsa_key()` function in `encryption_helper/main.py`. Refer to the PyCryptodome documentation for more advanced configurations.
+To modify these settings, you'll need to edit the `generate_rsa_key()` function in `encryption_helper/main.py`. Refer to the cryptography documentation for more advanced configurations.
 
 ## Development
 
@@ -149,3 +151,6 @@ pydoc -w encryption_helper
 ## License
 
 This project is licensed under the MIT License. See the [LICENSE](LICENSE) file for details.
+
+
+[0]: https://github.com/pyca/cryptography

encryption_helper/main.py

@@ -7,7 +7,9 @@
 
 from pathlib import Path
 from typing import Tuple
-from Crypto.PublicKey import RSA
+from cryptography.hazmat.primitives.asymmetric import rsa
+from cryptography.hazmat.primitives import serialization
+from cryptography.hazmat.backends import default_backend
 from .context import Context
 
 
@@ -41,18 +43,22 @@ def generate_rsa_key() -> Tuple[bytes, bytes]:
 
     try:
         # Generate the RSA key pair
-        key_pair = RSA.generate(2048)
+        key_pair = rsa.generate_private_key(
+            public_exponent=65537, key_size=2048, backend=default_backend()
+        )
 
         # Export the private key
-        private_key = key_pair.export_key(
-            format="PEM",
-            # passphrase="1password",  # Uncomment if you want to use a passphrase
-            # pkcs=1,
-            # protection="scryptAndAES256-CBC",
+        private_key = key_pair.private_bytes(
+            encoding=serialization.Encoding.PEM,
+            format=serialization.PrivateFormat.PKCS8,
+            encryption_algorithm=serialization.NoEncryption(),  # Use a passphrase if needed
         )
 
         # Export the public key
-        public_key = key_pair.publickey().export_key(format="PEM")
+        public_key = key_pair.public_key().public_bytes(
+            encoding=serialization.Encoding.PEM,
+            format=serialization.PublicFormat.SubjectPublicKeyInfo,
+        )
 
         # Create the directory for storing keys
         keys_dir = Path("keys/pem")

encryption_helper/utils/README.md

@@ -0,0 +1,47 @@
+<!-- markdownlint-disable MD033 MD041 -->
+<p align="center">
+  <img src="https://www.hsbc.com/-/files/hsbc/header/hsbc-logo-200x25.svg" alt="HSBC Logo" width="200" title="HSBC Logo">
+</p>
+
+<h1 align="center">Encryption Helper Python</h1>
+
+<p align="center">
+  <img src="../../assets/banner.jpg" alt="Encryption Helper Banner">
+</p>
+
+<h2 align="center">Checks and I/O Modules Overview</h2>
+
+<p align="center">
+  <strong>This package includes various modules for encryption helper functionalities.</strong>
+</p>
+
+<p align="center">
+  <a href="#checks-module">Checks Module</a> •
+  <a href="#io-modules">I/O Modules</a> •
+  <a href="#license">License</a>
+</p>
+<!-- markdownlint-enable MD033 MD041 -->
+
+## Checks Module
+
+The Checks module in the `encryption_helper` package provides utility functions for input validation.
+
+For detailed documentation, please refer to the `README.md` file in the respective folder:
+
+- [Checks Module](checks/README.md)
+
+## I/O Modules
+
+The I/O modules in the `encryption_helper` package provide functionalities for reading and writing files in binary mode.
+
+- **Read File Module**: Functions to read text files in binary mode.
+- **Write File Module**: Functions to write text files in binary mode.
+
+For detailed documentation, please refer to the `README.md` files in the respective folders:
+
+- [Read File Module](io/README.md)
+- [Write File Module](io/README.md)
+
+## License
+
+This project is licensed under the MIT License. See the [LICENSE](../../LICENSE) file for details.