Security & Digital Signatures - Nayax Developer Portal

Certain commands, such as displayInput, require a digital signature to ensure the integrity of the request.

Key Management

The client system is responsible for generating an RSA SHA-256 private-public key pair.

The Private Key must be maintained securely on your server.
The Public Key is used by the VPOS to verify the request.

C# Implementation

Below is an example of how to sign a message and verify the signature using PKCS#1 padding.

C#

static string SignMessage(string message, string privateKeyBase64)
{
    using (RSA rsa = ImportPrivateKey(privateKeyBase64))
    {
        byte[] messageBytes = Encoding.UTF8.GetBytes(message);
        byte[] signature = rsa.SignData(messageBytes, HashAlgorithmName.SHA256, RSASignaturePadding.Pkcs1);
        return Convert.ToBase64String(signature);
    }
}

static bool VerifySignature(string message, string signatureBase64, string publicKeyBase64)
{
    using (RSA rsa = ImportPublicKey(publicKeyBase64))
    {
        byte[] messageBytes = Encoding.UTF8.GetBytes(message);
        byte[] signature = Convert.FromBase64String(signatureBase64);
        return rsa.VerifyData(messageBytes, signature, HashAlgorithmName.SHA256, RSASignaturePadding.Pkcs1);
    }
}