private static byte[] DecodeOctetString(byte[] data)
{
const EncodingType type = EncodingType.X509_ASN_ENCODING;
var handle = default(GCHandle);
try
{
handle = GCHandle.Alloc(data, GCHandleType.Pinned);
var size = 0u;
const CryptDecodeFlags flags = CryptDecodeFlags.CRYPT_DECODE_ALLOC_FLAG;
if (!Crypto32.CryptDecodeObjectEx(type, X509_OCTET_STRING, handle.AddrOfPinnedObject(), (uint)data.Length, flags, IntPtr.Zero, out LocalBufferSafeHandle buffer, ref size))
{
return(null);
}
using (buffer)
{
unsafe
{
var structure = (CRYPT_OBJID_BLOB)Marshal.PtrToStructure(buffer.DangerousGetHandle(), typeof(CRYPT_OBJID_BLOB));
var ret = new byte[structure.cbData];
Marshal.Copy(structure.pbData, ret, 0, ret.Length);
return(ret);
}
}
}
finally
{
if (handle.IsAllocated)
{
handle.Free();
}
}
}
public static extern bool CryptDecodeObject(
CryptEncodingFlags certEncodingType,
IntPtr lpszStructType,
byte[] pbEncoded,
int cbEncoded,
CryptDecodeFlags flags,
[In, Out] byte[] pvStructInfo,
ref uint cbStructInfo
);
public static extern unsafe bool CryptDecodeObjectEx
(
[param: In, MarshalAs(UnmanagedType.U4)] EncodingType dwCertEncodingType,
[param: In, MarshalAs(UnmanagedType.SysInt)] IntPtr lpszStructType,
[param: In, MarshalAs(UnmanagedType.SysInt)] IntPtr pbEncoded,
[param: In, MarshalAs(UnmanagedType.U4)] uint cbEncoded,
[param: In, MarshalAs(UnmanagedType.U4)] CryptDecodeFlags dwFlags,
[param: In, MarshalAs(UnmanagedType.SysInt)] IntPtr pDecodePara,
[param: Out] out LocalBufferSafeHandle pvStructInfo,
[param: In, Out, MarshalAs(UnmanagedType.U4)] ref uint pcbStructInfo
);
internal static extern int CCGetCertNameList(IntPtr certContext, AltNameType dwAltNameChoice, CryptDecodeFlags dwFlags, out int cName, out IntPtr papwszName);
internal static extern int CCGetCertNameList(IntPtr certContext, AltNameType dwAltNameChoice, CryptDecodeFlags dwFlags, out int cName, out IntPtr papwszName);
