private DateTime ReadFromFileTime(WinCrypt32.FILETIME fileTime)
{
var uhigh = (ulong)fileTime.dwHighDateTime;
var ulow = (uint)fileTime.dwLowDateTime;
uhigh = uhigh << 32;
var ticks = (long)(uhigh | ulow);
return DateTime.FromFileTimeUtc(ticks);
}
public void PopulateCrlWrapperFields(byte[] CrlFileBinary)
{
var phCertStore = IntPtr.Zero;
var pvContext = IntPtr.Zero;
var hCrlData = new GCHandle();
var hCryptBlob = new GCHandle();
try
{
hCrlData = GCHandle.Alloc(CrlFileBinary, GCHandleType.Pinned);
WinCrypt32.CRYPTOAPI_BLOB stCryptBlob;
stCryptBlob.cbData = CrlFileBinary.Length;
stCryptBlob.pbData = hCrlData.AddrOfPinnedObject();
hCryptBlob = GCHandle.Alloc(stCryptBlob, GCHandleType.Pinned);
if (!WinCrypt32.CryptQueryObject(
WinCrypt32.CERT_QUERY_OBJECT_BLOB,
hCryptBlob.AddrOfPinnedObject(),
WinCrypt32.CERT_QUERY_CONTENT_FLAG_CRL,
WinCrypt32.CERT_QUERY_FORMAT_FLAG_BINARY,
0,
IntPtr.Zero,
IntPtr.Zero,
IntPtr.Zero,
ref phCertStore,
IntPtr.Zero,
ref pvContext
))
{
throw new Win32Exception(Marshal.GetLastWin32Error(), "CRL is Corrupted.");
}
var stCrlContext = (WinCrypt32.CRL_CONTEXT)Marshal.PtrToStructure(pvContext, typeof(WinCrypt32.CRL_CONTEXT));
var stCrlInfo = (WinCrypt32.CRL_INFO)Marshal.PtrToStructure(stCrlContext.pCrlInfo, typeof(WinCrypt32.CRL_INFO));
_validUntil = ReadFromFileTime(stCrlInfo.NextUpdate);
_validFrom = ReadFromFileTime(stCrlInfo.ThisUpdate);
PopulateRevokedSerialNumbers(stCrlInfo);
}
finally
{
if (hCrlData.IsAllocated)
{
hCrlData.Free();
}
if (hCryptBlob.IsAllocated)
{
hCryptBlob.Free();
}
if (!pvContext.Equals(IntPtr.Zero))
{
WinCrypt32.CertFreeCRLContext(pvContext);
}
}
}
private void PopulateRevokedSerialNumbers(WinCrypt32.CRL_INFO stCrlInfo)
{
_revokedSerialNumbers = new List<string>();
var rgCrlEntry = stCrlInfo.rgCRLEntry;
for (var i = 0; i < stCrlInfo.cCRLEntry; i++)
{
var serial = string.Empty;
var stCrlEntry = (WinCrypt32.CRL_ENTRY)Marshal.PtrToStructure(rgCrlEntry, typeof(WinCrypt32.CRL_ENTRY));
IntPtr pByte = stCrlEntry.SerialNumber.pbData;
for (var j = 0; j < stCrlEntry.SerialNumber.cbData; j++)
{
Byte bByte = Marshal.ReadByte(pByte);
serial = bByte.ToString("X").PadLeft(2, '0') + serial;
pByte = pByte + Marshal.SizeOf(typeof(byte));
}
_revokedSerialNumbers.Add(serial);
rgCrlEntry = rgCrlEntry + Marshal.SizeOf(typeof(WinCrypt32.CRL_ENTRY));
}
}
