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

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

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

cd path/to/your/directory

1. 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.