/// <summary>
/// Loads the private key from a PFX file in the certificate store.
/// </summary>
public X509Certificate2 LoadPrivateKey(string thumbprint, string subjectName, string password)
{
if (m_certificateSubdir == null || !m_certificateSubdir.Exists)
{
return(null);
}
if (string.IsNullOrEmpty(thumbprint) && string.IsNullOrEmpty(subjectName))
{
return(null);
}
foreach (FileInfo file in m_certificateSubdir.GetFiles("*.der"))
{
try
{
X509Certificate2 certificate = new X509Certificate2(file.FullName);
if (!String.IsNullOrEmpty(thumbprint))
{
if (!string.Equals(certificate.Thumbprint, thumbprint, StringComparison.CurrentCultureIgnoreCase))
{
continue;
}
}
if (!String.IsNullOrEmpty(subjectName))
{
if (!Utils.CompareDistinguishedName(subjectName, certificate.Subject))
{
if (subjectName.Contains("="))
{
continue;
}
if (!Utils.ParseDistinguishedName(certificate.Subject).Any(s => s.Equals("CN=" + subjectName, StringComparison.OrdinalIgnoreCase)))
{
continue;
}
}
}
string fileRoot = file.Name.Substring(0, file.Name.Length - file.Extension.Length);
StringBuilder filePath = new StringBuilder();
filePath.Append(m_privateKeySubdir.FullName);
filePath.Append(Path.DirectorySeparatorChar);
filePath.Append(fileRoot);
FileInfo privateKeyFile = new FileInfo(filePath.ToString() + ".pfx");
password = password ?? String.Empty;
try
{
certificate = new X509Certificate2(
privateKeyFile.FullName,
password,
X509KeyStorageFlags.Exportable | X509KeyStorageFlags.UserKeySet);
if (CertificateFactory.VerifyRSAKeyPair(certificate, certificate, true))
{
return(certificate);
}
}
catch (Exception)
{
certificate = new X509Certificate2(
privateKeyFile.FullName,
password,
X509KeyStorageFlags.Exportable | X509KeyStorageFlags.MachineKeySet);
if (CertificateFactory.VerifyRSAKeyPair(certificate, certificate, true))
{
return(certificate);
}
}
}
catch (Exception e)
{
Utils.Trace(e, "Could not load private key for certificate " + subjectName);
}
}
return(null);
}
