private static X509Certificate2 GetCertificate(StoreName storeName, StoreLocation storeLocation)
{
X509Certificate2 x509Certificate = SystemProbeId.testEncryptionCertificate;
if (x509Certificate == null)
{
X509Store x509Store = new X509Store(storeName, storeLocation);
x509Store.Open(OpenFlags.ReadOnly);
foreach (X509Certificate2 x509Certificate2 in x509Store.Certificates)
{
if (x509Certificate2.Subject == "CN=FfoSystemProbe")
{
x509Certificate = x509Certificate2;
break;
}
}
x509Store.Close();
}
if (x509Certificate == null)
{
throw new SystemProbeException(SystemProbeStrings.CertificateNotFound);
}
if (DateTime.UtcNow < x509Certificate.NotBefore || DateTime.UtcNow > x509Certificate.NotAfter)
{
throw new SystemProbeException(SystemProbeStrings.CertificateTimeNotValid(x509Certificate.GetEffectiveDateString(), x509Certificate.GetExpirationDateString()));
}
if (!SystemProbeId.IsSelfSigned(x509Certificate) && !x509Certificate.Verify())
{
throw new SystemProbeException(SystemProbeStrings.CertificateNotSigned);
}
return(x509Certificate);
}
public static void DecryptProbeGuid(string cyphertext, out Guid guid, out DateTime timestamp)
{
X509Certificate2 privateCertificate = SystemProbeId.GetPrivateCertificate();
RSACryptoServiceProvider rsacryptoServiceProvider = (RSACryptoServiceProvider)privateCertificate.PrivateKey;
byte[] rgb;
try
{
rgb = Convert.FromBase64String(cyphertext);
}
catch (ArgumentNullException innerException)
{
throw new SystemProbeException(SystemProbeStrings.NullEncryptedData, innerException);
}
catch (FormatException innerException2)
{
throw new SystemProbeException(SystemProbeStrings.EncryptedDataNotValidBase64String, innerException2);
}
string[] array = null;
try
{
byte[] array2 = rsacryptoServiceProvider.Decrypt(rgb, false);
if (array2 != null)
{
UnicodeEncoding unicodeEncoding = new UnicodeEncoding();
string @string = unicodeEncoding.GetString(array2);
if (!string.IsNullOrEmpty(@string))
{
array = @string.Split("|".ToCharArray());
}
}
}
catch (CryptographicException innerException3)
{
throw new SystemProbeException(SystemProbeStrings.EncryptedDataCannotBeDecrypted, innerException3);
}
if (array == null || array.Length != 2)
{
throw new SystemProbeException(SystemProbeStrings.InvalidGuidInDecryptedText);
}
guid = Guid.Empty;
timestamp = DateTime.MinValue;
if (!Guid.TryParse(array[0], out guid))
{
throw new SystemProbeException(SystemProbeStrings.InvalidGuidInDecryptedText);
}
long ticks = 0L;
if (!long.TryParse(array[1], out ticks))
{
throw new SystemProbeException(SystemProbeStrings.InvalidTimeInDecryptedText);
}
timestamp = new DateTime(ticks);
}
public static string EncryptProbeGuid(Guid guid, DateTime timestamp)
{
if (guid == Guid.Empty)
{
throw new ArgumentException("Guid to encrypt must not be Guid.Empty");
}
X509Certificate2 publicCertificate = SystemProbeId.GetPublicCertificate();
UnicodeEncoding unicodeEncoding = new UnicodeEncoding();
byte[] bytes = unicodeEncoding.GetBytes(string.Format("{0}|{1}", guid.ToString(), timestamp.Ticks.ToString()));
RSACryptoServiceProvider rsacryptoServiceProvider = (RSACryptoServiceProvider)publicCertificate.PublicKey.Key;
return(Convert.ToBase64String(rsacryptoServiceProvider.Encrypt(bytes, false)));
}
internal static X509Certificate2 GetPrivateCertificate()
{
return(SystemProbeId.GetCertificate(StoreName.My, StoreLocation.LocalMachine));
}
internal static X509Certificate2 GetPublicCertificate()
{
return(SystemProbeId.GetCertificate(StoreName.CertificateAuthority, StoreLocation.LocalMachine));
}