Auth Service: Encrypt & Decrypt

A secure Java-based authentication service with built-in encryption and decryption capabilities, designed for applications requiring secure data handling, user authentication, and cryptographic operations.

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📌 Overview

This project provides a modular, scalable, and secure authentication service with the following core features:

• User Authentication: Secure login/logout and token-based authentication.
• Data Encryption/Decryption: Protect sensitive data using industry-standard cryptographic algorithms.
• RESTful API: Easy-to-integrate endpoints for authentication and encryption operations.
• Modular Architecture: Separation of concerns with dedicated layers for controllers, services, repositories, and utilities.

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🛠️ Features

1. Authentication

• User Login/Logout: Secure authentication using credentials.
• Token Generation: JWT (JSON Web Token) or custom token generation for session management.
• Role-Based Access Control (RBAC): Assign and validate user roles for authorization.

2. Encryption & Decryption

• Symmetric Encryption: Uses AES (Advanced Encryption Standard) for encrypting/decrypting sensitive data.
• Key Management: Secure storage and retrieval of encryption keys.
• Customizable Algorithms: Easily extendable to support other encryption standards (e.g., RSA, Blowfish).

3. API Endpoints

• Authentication:
  • POST /api/auth/login: Authenticate users and return a token.
  • POST /api/auth/logout: Invalidate user sessions.
• Encryption/Decryption:
  • POST /api/encrypt: Encrypt a plaintext message.
  • POST /api/decrypt: Decrypt a ciphertext message.

4. Database Integration

• JPA/Hibernate: ORM for database operations.
• User Entity: Stores user credentials, roles, and metadata.
• Encryption Keys: Securely stored and managed.

5. Security

• Password Hashing: Uses BCrypt or PBKDF2 for secure password storage.
• Input Validation: Protects against common vulnerabilities (e.g., SQL injection, XSS).
• HTTPS Support: Encrypted communication for all API endpoints.

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📦 Project Structure

Directory	Description
controller/	REST API endpoints for handling authentication and encryption/decryption requests.
dto/	Data Transfer Objects (DTOs) for request/response payloads.
encryption/	Core encryption/decryption logic, including key management and algorithm implementations.
entity/	JPA entities for database mapping (e.g., User, EncryptionKey).
repository/	Database access layer (Spring Data JPA repositories).
service/	Business logic for authentication, encryption, and user management.
common/	Shared utilities, constants, and helper classes.
resources/	Configuration files (e.g., application.properties, application.yml) and static resources.

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🚀 Getting Started

Prerequisites

• Java 8+
• Maven 3.6+
• Spring Boot 2.7+
• Database: MySQL or H2 (for testing).

Installation

1. Clone the Repository:

   git clone https://github.com/SujalGadhave/auth-service-encrypt-decrypt.git
   cd auth-service-encrypt-decrypt