AES Encryption/Decryption Console App

This is a simple and modular C# console application for AES (Advanced Encryption Standard) encryption and decryption. It provides a clean interface for securely handling plaintext and encrypted text using a Base64-encoded key and IV.

Features

• AES Encryption: Convert plaintext into ciphertext using AES with user-provided key and IV.
• AES Decryption: Recover plaintext from ciphertext using AES.
• User-Friendly Interface: Interactive menu system for ease of use.

Requirements

• .NET SDK: Ensure you have the .NET SDK installed.
• Basic Knowledge: Understanding of AES encryption and Base64 encoding for keys and initialization vectors.

Usage

1. Clone the Repository:

   git clone https://github.com/Behrouz-Goudarzi/aes-console-app.git
   cd aes-console-app
   
   

2. Build the Application: Use an IDE like Visual Studio or the .NET CLI:

   dotnet build

3. Run the Application:

   dotnet run

4. Follow the Console Instructions:

   • Select an operation:
     • 1 for AES Encryption.
     • 2 for AES Decryption.
     • Any other key to quit.
   • Provide the necessary inputs:
     • AES Key (Base64-encoded string).
     • AES Initialization Vector (Base64-encoded string).
     • Plaintext or encrypted text.

Example Usage

Encryption

Input:

• Key: Base64EncodedKey
• IV: Base64EncodedIV
• Plain Text: Hello, World!

Output:

• Encrypted Text: EncryptedBase64String

Decryption

Input:

• Key: Base64EncodedKey
• IV: Base64EncodedIV
• Encrypted Text: EncryptedBase64String

Output:

• Plain Text: Hello, World!

Code Structure

Main Program

• Menu-Driven Flow: The application uses a simple switch statement to handle encryption and decryption operations.
• Helper Methods:
  • DisplayMenu: Displays available operations to the user.
  • HandleEncryption: Handles the encryption process, including user input and output display.
  • HandleDecryption: Handles the decryption process similarly.
  • PromptUserInput: Simplifies input prompts for reuse.
  • DisplayResult: Displays successful results with formatting.
  • DisplayError: Handles and displays error messages gracefully.

AES Class

The core encryption and decryption logic is encapsulated in the AES class, ensuring:

• Reusability: Easily used in other projects.
• Clarity: Clean and concise methods for encryption and decryption.

Contribution

Contributions to improve this project are welcome! Feel free to fork the repository, make changes, and submit a pull request.

License

This project is licensed under the MIT License.

---

Disclaimer: This application is for educational purposes only. It should not be used in production environments without thorough testing and security improvements.