github.com/ujjvalrajput/post-quantum-cryptography-experimentation

Crypto Agile Example

This project demonstrates how to integrate AES encryption and RSA digital signatures into a Go program. The example ensures the message is protected and verified, making it suitable for Crypto Agile applications.

Prerequisites

• Go (version 1.13 or later)

Setup

• Clone the repository or download the main.go file to your local machine.

• Navigate to the directory where the main.go file is located.

cd path/to/your/directory

• Set the AES_KEY environment variable. This key will be used for AES encryption. Replace thisis16byteskey with your desired key.

  • On Linux or macOS:

    export AES_KEY=thisis16byteskey
    

  • On Windows (Command Prompt):

    set AES_KEY=thisis16byteskey
    

  • On Windows (PowerShell):

    $env:AES_KEY="thisis16byteskey"
    

Running the Program

To run the program, use the go run command:

go run main.go

Example Commands

Linux or macOS:

export AES_KEY=thisis16byteskey
go run main.go

Windows (Command Prompt):

set AES_KEY=thisis16byteskey
go run main.go

Windows (PowerShell):

$env:AES_KEY="thisis16byteskey"
go run main.go

Output

If everything is set up correctly, you should see output similar to the following:

Original Message: Hello, Crypto Agile!
Encrypted Message: [hex-encoded encrypted message]
SHA-256 Hash: [calculated hash]
RSA Signature: [hex-encoded RSA signature]
Signature Verification: true

Code Explanation

• AES Encryption: The encryptAES function encrypts a plaintext message using AES encryption.
• Padding: The pad function pads the plaintext to ensure it is a multiple of the AES block size. The unpad function removes this padding.
• Hashing: The calculateHash function calculates the SHA-256 hash of the input.
• RSA Key Pair: The generateRSAKeyPair function generates an RSA key pair.
• RSA Signing: The signRSA function signs the hashed message using the RSA private key.
• RSA Verification: The verifyRSA function verifies the RSA signature using the RSA public key.