Encryption/Decryption API

This project provides a REST API for cryptographic operations using Rust and Rocket. The API allows users to create user keys, encrypt messages, and decrypt messages using the x25519_dalek and aes_gcm crates for secure cryptographic operations. The encryption and decryption processes utilize the Diffie-Hellman key exchange method to securely derive a shared secret between two parties.

Features

• Create User Key: Generates a new user key pair (public and secret keys) using Diffie-Hellman key exchange.
• Encrypt Message: Encrypts a message using a shared secret derived from Diffie-Hellman key exchange.
• Decrypt Message: Decrypts a message using a shared secret derived from the Diffie-Hellman key exchange.

Endpoints

Create User Key

• Endpoint: /create_user_key
• Method: POST
• Description: Generates a new user key pair.
• Response:

  {
    "public_key": [byte array],
    "user_secret": [byte array]
  }

Encrypt Message

• Endpoint: /encrypt

• Method: POST

• Description: Encrypts a message.

• Request Body:

    {
    "nonce": "12_byte_string",
    "message": "your_message",
    "other_public_key": [byte array],
    "user_secret": [byte array]
    }

• Response:

    {
    "ciphertext": [byte array]
    }

Decrypt Message

• Endpoint: /decrypt

• Method: POST

• Description: Decrypts a message.

• Request Body:

    {
  "ciphertext": [byte array],
  "other_public_key": [byte array],
  "user_secret": [byte array],
  "nonce": "12_byte_string"
    }

• Response:

    {
        "message": "your_decrypted_message"
    }

Requirements

• Rust 1.76 or later
• cargo

Setup

1. Clone the repository

gh repo clone afgonzalez-dev/EnigmaChat cd EnigmaChat

2. cargo build

Running the Server

cargo run

Create User Key

curl -X POST http://localhost:8000/create_user_key

Encrypt Message

  "nonce": "123456789012",
  "message": "Hello, World!",
  "other_public_key": [48, 165, ...],
  "user_secret": [106, 54, ...]
}' ```

## Decrypt Message
``` curl -X POST http://localhost:8000/decrypt -H "Content-Type: application/json" -d '{
  "ciphertext": [99, 34, ...],
  "other_public_key": [48, 165, ...],
  "user_secret": [106, 54, ...],
  "nonce": "123456789012"
}' ```

Project Structure

enigmachat/ ├── Cargo.toml ├── src/ │ ├── main.rs │ ├── api/ │ │ ├── mod.rs │ │ ├── user_key.rs │ │ ├── encrypt.rs │ │ ├── decrypt.rs │ ├── crypto/ │ │ ├── mod.rs │ │ ├── key_management.rs │ │ ├── encryption.rs │ │ ├── decryption.rs │ └── catchers/ │ ├── mod.rs │ ├── validation.rs └── src/error.rs