internal static unsafe IntPtr CreateCryptAttributes(CryptographicAttributeObjectCollection attributes)
{
if (attributes.Count == 0)
{
return(IntPtr.Zero);
}
uint num = 0;
uint num2 = AlignedLength((uint)Marshal.SizeOf(typeof(I_CRYPT_ATTRIBUTE)));
uint num3 = AlignedLength((uint)Marshal.SizeOf(typeof(System.Security.Cryptography.CAPI.CRYPTOAPI_BLOB)));
CryptographicAttributeObjectEnumerator enumerator = attributes.GetEnumerator();
while (enumerator.MoveNext())
{
CryptographicAttributeObject current = enumerator.Current;
num += num2;
num += AlignedLength((uint)(current.Oid.Value.Length + 1));
AsnEncodedDataEnumerator enumerator2 = current.Values.GetEnumerator();
while (enumerator2.MoveNext())
{
AsnEncodedData data = enumerator2.Current;
num += num3;
num += AlignedLength((uint)data.RawData.Length);
}
}
System.Security.Cryptography.SafeLocalAllocHandle handle = System.Security.Cryptography.CAPI.LocalAlloc(0x40, new IntPtr((long)num));
I_CRYPT_ATTRIBUTE *i_crypt_attributePtr = (I_CRYPT_ATTRIBUTE *)handle.DangerousGetHandle();
IntPtr ptr = new IntPtr(((long)handle.DangerousGetHandle()) + (num2 * attributes.Count));
CryptographicAttributeObjectEnumerator enumerator3 = attributes.GetEnumerator();
while (enumerator3.MoveNext())
{
CryptographicAttributeObject obj3 = enumerator3.Current;
byte * numPtr = (byte *)ptr;
byte[] bytes = new byte[obj3.Oid.Value.Length + 1];
System.Security.Cryptography.CAPI.CRYPTOAPI_BLOB *cryptoapi_blobPtr = (System.Security.Cryptography.CAPI.CRYPTOAPI_BLOB *)(numPtr + AlignedLength((uint)bytes.Length));
i_crypt_attributePtr->pszObjId = (IntPtr)numPtr;
i_crypt_attributePtr->cValue = (uint)obj3.Values.Count;
i_crypt_attributePtr->rgValue = (IntPtr)cryptoapi_blobPtr;
Encoding.ASCII.GetBytes(obj3.Oid.Value, 0, obj3.Oid.Value.Length, bytes, 0);
Marshal.Copy(bytes, 0, i_crypt_attributePtr->pszObjId, bytes.Length);
IntPtr destination = new IntPtr(((long)((ulong)cryptoapi_blobPtr)) + (obj3.Values.Count * num3));
AsnEncodedDataEnumerator enumerator4 = obj3.Values.GetEnumerator();
while (enumerator4.MoveNext())
{
byte[] rawData = enumerator4.Current.RawData;
if (rawData.Length > 0)
{
cryptoapi_blobPtr->cbData = (uint)rawData.Length;
cryptoapi_blobPtr->pbData = destination;
Marshal.Copy(rawData, 0, destination, rawData.Length);
destination = new IntPtr(((long)destination) + AlignedLength((uint)rawData.Length));
}
cryptoapi_blobPtr++;
}
i_crypt_attributePtr++;
ptr = destination;
}
GC.SuppressFinalize(handle);
return(handle.DangerousGetHandle());
}
static void Main()
{
//The following example demonstrates the usage the AsnEncodedData classes.
// Asn encoded data is read from the extensions of an X509 certificate.
try
{
// Open the certificate store.
X509Store store = new X509Store("MY", StoreLocation.CurrentUser);
store.Open(OpenFlags.ReadOnly | OpenFlags.OpenExistingOnly);
X509Certificate2Collection collection = (X509Certificate2Collection)store.Certificates;
X509Certificate2Collection fcollection = (X509Certificate2Collection)collection.Find(X509FindType.FindByTimeValid, DateTime.Now, false);
// Select one or more certificates to display extensions information.
X509Certificate2Collection scollection = X509Certificate2UI.SelectFromCollection(fcollection, "Certificate Select", "Select certificates from the following list to get extension information on that certificate", X509SelectionFlag.MultiSelection);
// Create a new AsnEncodedDataCollection object.
AsnEncodedDataCollection asncoll = new AsnEncodedDataCollection();
for (int i = 0; i < scollection.Count; i++)
{
// Display certificate information.
Console.ForegroundColor = ConsoleColor.Red;
Console.WriteLine("Certificate name: {0}", scollection[i].GetName());
Console.ResetColor();
// Display extensions information.
foreach (X509Extension extension in scollection[i].Extensions)
{
// Create an AsnEncodedData object using the extensions information.
AsnEncodedData asndata = new AsnEncodedData(extension.Oid, extension.RawData);
Console.ForegroundColor = ConsoleColor.Green;
Console.WriteLine("Extension type: {0}", extension.Oid.FriendlyName);
Console.WriteLine("Oid value: {0}", asndata.Oid.Value);
Console.WriteLine("Raw data length: {0} {1}", asndata.RawData.Length, Environment.NewLine);
Console.ResetColor();
Console.WriteLine(asndata.Format(true));
Console.WriteLine(Environment.NewLine);
// Add the AsnEncodedData object to the AsnEncodedDataCollection object.
asncoll.Add(asndata);
}
Console.WriteLine(Environment.NewLine);
}
Console.ForegroundColor = ConsoleColor.Red;
Console.WriteLine("Number of AsnEncodedData items in the collection: {0} {1}", asncoll.Count, Environment.NewLine);
Console.ResetColor();
store.Close();
//Create an enumerator for moving through the collection.
AsnEncodedDataEnumerator asne = asncoll.GetEnumerator();
//You must execute a MoveNext() to get to the first item in the collection.
asne.MoveNext();
// Write out AsnEncodedData in the collection.
Console.ForegroundColor = ConsoleColor.Blue;
Console.WriteLine("First AsnEncodedData in the collection: {0}", asne.Current.Format(true));
Console.ResetColor();
asne.MoveNext();
Console.ForegroundColor = ConsoleColor.DarkBlue;
Console.WriteLine("Second AsnEncodedData in the collection: {0}", asne.Current.Format(true));
Console.ResetColor();
//Return index in the collection to the beginning.
asne.Reset();
}
catch (CryptographicException)
{
Console.WriteLine("Information could not be written out for this certificate.");
}
}
