private static byte[] SignMessage(X509Certificate2 certificate, byte[] message)
{
// Создание объекта для подписи сообщения
var signedCms = new GostSignedCms(new ContentInfo(message), true);
// Создание объектс с информацией о подписчике
var signer = new CmsSigner(certificate);
// Включение информации только о конечном сертификате (только для теста)
signer.IncludeOption = X509IncludeOption.EndCertOnly;
// Создание подписи для сообщения CMS/PKCS#7
signedCms.ComputeSignature(signer);
// Создание подписи CMS/PKCS#7
return(signedCms.Encode());
}
/// <summary>
/// Signs the message with a GOST digital signature and returns the attached signature (CMS format, base64 encoding).
/// </summary>
public static string ComputeAttachedSignature(X509Certificate2 certificate, byte[] message)
{
// The following line opens the private key.
// It requires that the current user has permissions to use the private key.
// Permissions are given using MMC console, Certificates snap-in.
var privateKey = (GostAsymmetricAlgorithm)certificate.GetPrivateKeyAlgorithm();
var publicKey = (GostAsymmetricAlgorithm)certificate.GetPublicKeyAlgorithm();
// Create GOST-compliant signature helper
var signedCms = new GostSignedCms(new ContentInfo(message), detached: false);
// The object that has the signer information
var signer = new CmsSigner(certificate);
// Computing the CMS/PKCS#7 signature
signedCms.ComputeSignature(signer, true);
// Encoding the CMS/PKCS#7 message
var encoded = signedCms.Encode();
return(Convert.ToBase64String(encoded));
}