/// <summary>
/// Sign the data with the RSA CSP.
/// </summary>
/// <param name="data">The data to sign.</param>
/// <param name="cspParameters">The CSP parameters.</param>
/// <param name="hashcode">The hash code to use.</param>
/// <returns>The signature.</returns>
/// <remarks>
/// Create a new CspParameters object that identifies a
/// Smart Card CryptoGraphic Provider.
/// The 1st parameter comes from HKEY_LOCAL_MACHINE\Software\Microsoft\Cryptography\Defaults\Provider Types.
/// The 2nd parameter comes from HKEY_LOCAL_MACHINE\Software\Microsoft\Cryptography\Defaults\Provider.
/// </remarks>
public byte[] Sign(byte[] data, CspParameters cspParameters, HashcodeType hashcode = HashcodeType.SHA512)
{
// Initialize an RSACryptoServiceProvider object using
// the CspParameters object.
RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(cspParameters);
// Sign the data using the Smart Card CryptoGraphic Provider.
byte[] sig = rsa.SignData(data, hashcode.ToString());
return(sig);
}
/// <summary>
/// Verify the data with the RSA CSP.
/// </summary>
/// <param name="data">The data that was signed.</param>
/// <param name="signature">The signature of the original data.</param>
/// <param name="cspParameters">The CSP parameters.</param>
/// <param name="hashcode">The hash code to use.</param>
/// <returns>True if the data is valid; else false.</returns>
/// <remarks>
/// Create a new CspParameters object that identifies a
/// Smart Card CryptoGraphic Provider.
/// The 1st parameter comes from HKEY_LOCAL_MACHINE\Software\Microsoft\Cryptography\Defaults\Provider Types.
/// The 2nd parameter comes from HKEY_LOCAL_MACHINE\Software\Microsoft\Cryptography\Defaults\Provider.
/// </remarks>
public bool Verify(byte[] data, byte[] signature, CspParameters cspParameters, HashcodeType hashcode = HashcodeType.SHA512)
{
// Initialize an RSACryptoServiceProvider object using
// the CspParameters object.
RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(cspParameters);
// Verify the data using the Smart Card CryptoGraphic Provider.
bool verified = rsa.VerifyData(data, hashcode.ToString(), signature);
return(verified);
}
