public static void AddSigner_DSA_EphemeralKey()
{
using (DSA dsa = DSA.Create())
using (X509Certificate2 publicCertificate = Certificates.Dsa1024.GetCertificate())
using (X509Certificate2 certificateWithKey = Certificates.Dsa1024.TryGetCertificateWithPrivateKey(exportable: true))
{
if (certificateWithKey == null)
{
return;
}
using (DSA privateKey = certificateWithKey.GetDSAPrivateKey())
using (DSA exportableKey = privateKey.MakeExportable())
{
dsa.ImportParameters(exportableKey.ExportParameters(true));
}
using (X509Certificate2 certWithEphemeralKey = publicCertificate.CopyWithPrivateKey(dsa))
{
ContentInfo content = new ContentInfo(new byte[] { 1, 2, 3 });
SignedCms cms = new SignedCms(content, false);
CmsSigner signer = new CmsSigner(certWithEphemeralKey)
{
DigestAlgorithm = new Oid(Oids.Sha1, Oids.Sha1)
};
cms.ComputeSignature(signer);
}
}
}