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APPLICATION TESTING AND SECURITY

Generate RSA public and private keys, export to XML


Stefan Prodan
05.21.2007
Rating: --- (out of 5)


.NET Essentials Channel
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The following method shows how RSA keys can be saved to disk as an XML file. The XML files can then be used to make an RSA secure channel -- the public key is used for encryption and the private one for decryption. 
/// <summary>
/// Generates 2 XML files (public and private key) 
/// </summary> 
/// <param name="privateKeyPath">RSA private key file path</param> 
/// <param name="publicKeyPath">RSA private key file path</param> /
// <param name="size">secure size must be above 512</param> 
public static void GenerateRsa(string privateKeyPath, string publicKeyPath, int size) 
{
    //stream to save the keys
    FileStream fs = null;
    StreamWriter sw = null;

    //create RSA provider
    RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(size);
    try
    {
        //save private key
        fs = new FileStream(privateKeyPath, FileMode.Create, FileAccess.Write);
        sw = new StreamWriter(fs);
        sw.Write(rsa.ToXmlString(true));
        sw.Flush();
    }
    finally
    {
        if (sw != null) sw.Close();
        if (fs != null) fs.Close();
    }

    try
    {
        //save public key
        fs = new FileStream(publicKeyPath, FileMode.Create, FileAccess.Write);
        sw = new StreamWriter(fs);
        sw.Write(rsa.ToXmlString(false));
        sw.Flush();
    }
    finally
    {
        if (sw != null) sw.Close();
        if (fs != null) fs.Close();
    }
    rsa.Clear();
}

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