🔐 Spring Encryption Service (FactoryBean Based)

A simple and extensible Spring Core project demonstrating how to dynamically switch between different encryption algorithms using FactoryBean, Java Configuration, and Strategy Pattern principles.

---

🚀 Features

• 🔄 Dynamic encryption selection via configuration

• 🏭 Uses Spring FactoryBean for object creation

• 🧩 Supports multiple encryption strategies:

  • AES Encryption
  • RSA Encryption
  • SHA Hashing

• ⚙️ Externalized configuration using application.properties

• 📦 Clean layered package structure

---

🧠 Concept Used

• Spring Core (Annotation-based configuration)
• FactoryBean pattern
• Strategy Design Pattern
• Dependency Injection (DI)
• Loose coupling & extensibility

---

📁 Project Structure

com.nit
│
├── config
│   └── AppConfig.java
│
├── factoryBean
│   └── EncryptionServiceFactoryBean.java
│
├── main
│   └── TestApp.java
│
├── properties
│   └── application.properties
│
└── sbeans
    ├── EncryptionService.java
    ├── AESEncryption.java
    ├── RSAEncryption.java
    └── SHAHashing.java

---

⚙️ Configuration

Set the encryption type in:

application.properties

Example:

encryption=aes

You can change values to:

• aes
• rsa
• sha

---

🏗️ Core Implementation

🔹 FactoryBean Implementation

The factory decides which encryption strategy to return at runtime.

📄 EncryptionServiceFactoryBean.java

---

🔹 Configuration Class

Loads property and injects it into FactoryBean.

📄 AppConfig.java

---

🔹 Service Interface

Common contract for all encryption types.

📄 EncryptionService.java

---

🔹 Implementations

• AES Encryption →
• RSA Encryption →
• SHA Hashing →

---

🔹 Main Class

Runs the application using Spring context.

📄 TestApp.java

---

▶️ How to Run

1. Clone the repository

git clone https://github.com/your-username/encryption-service.git

2. Open in IDE (IntelliJ / Eclipse)

3. Set encryption type in application.properties

4. Run:

TestApp.java

---

💡 Sample Output

AESEncryption successfull.
AESDecryption successfull.

(Change property to see different outputs)

---

⚠️ Known Issue

There is a small bug in EncryptionServiceFactoryBean:

else if("aes".equalsIgnoreCase(encryptionType))

This condition is duplicated.

👉 Fix it to:

else if("rsa".equalsIgnoreCase(encryptionType))

---

🔮 Future Enhancements

• Add real encryption logic instead of print statements
• Support additional algorithms (Blowfish, DES, etc.)
• Convert into Spring Boot application
• Add REST API layer
• Add unit testing with JUnit

---

🤝 Contributing

Pull requests are welcome. For major changes, open an issue first to discuss what you'd like to change.

---

📜 License

This project is open-source and free to use.

---

👨‍💻 Author

Developed as a learning project to demonstrate Spring FactoryBean and dynamic bean creation.

---

⭐ If this helped you, drop a star on the repo!