private void DecodeExtension()
{
uint cbDecoded = 0;
SafeLocalAllocHandle decoded = null;
bool result = CAPI.DecodeObject(new IntPtr(CAPI.X509_ENHANCED_KEY_USAGE),
m_rawData,
out decoded,
out cbDecoded);
if (result == false)
{
throw new CryptographicException(Marshal.GetLastWin32Error());
}
CAPI.CERT_ENHKEY_USAGE pEnhKeyUsage = (CAPI.CERT_ENHKEY_USAGE)Marshal.PtrToStructure(decoded.DangerousGetHandle(), typeof(CAPI.CERT_ENHKEY_USAGE));
m_enhancedKeyUsages = new OidCollection();
for (int index = 0; index < pEnhKeyUsage.cUsageIdentifier; index++)
{
IntPtr pszOid = Marshal.ReadIntPtr(new IntPtr((long)pEnhKeyUsage.rgpszUsageIdentifier + index * Marshal.SizeOf(typeof(IntPtr))));
string oidValue = Marshal.PtrToStringAnsi(pszOid);
Oid oid = new Oid(oidValue, OidGroup.ExtensionOrAttribute, false);
m_enhancedKeyUsages.Add(oid);
}
m_decoded = true;
decoded.Dispose();
}
private static unsafe byte[] EncodeExtension(OidCollection enhancedKeyUsages)
{
if (enhancedKeyUsages == null)
{
throw new ArgumentNullException("enhancedKeyUsages");
}
SafeLocalAllocHandle safeLocalAllocHandle = X509Utils.CopyOidsToUnmanagedMemory(enhancedKeyUsages);
byte[] encodedEnhancedKeyUsages = null;
using (safeLocalAllocHandle) {
CAPI.CERT_ENHKEY_USAGE pEnhKeyUsage = new CAPI.CERT_ENHKEY_USAGE();
pEnhKeyUsage.cUsageIdentifier = (uint)enhancedKeyUsages.Count;
pEnhKeyUsage.rgpszUsageIdentifier = safeLocalAllocHandle.DangerousGetHandle();
if (!CAPI.EncodeObject(CAPI.szOID_ENHANCED_KEY_USAGE, new IntPtr(&pEnhKeyUsage), out encodedEnhancedKeyUsages))
{
throw new CryptographicException(Marshal.GetLastWin32Error());
}
}
return(encodedEnhancedKeyUsages);
}
