SECPKG_USER_FUNCTION_TABLE

using System;
using System.Runtime.InteropServices;

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
public struct SECPKG_USER_FUNCTION_TABLE
{
    public IntPtr InstanceInit;
    public IntPtr InitUserModeContext;
    public IntPtr MakeSignature;
    public IntPtr VerifySignature;
    public IntPtr SealMessage;
    public IntPtr UnsealMessage;
    public IntPtr GetContextToken;
    public IntPtr QueryContextAttributesA;
    public IntPtr CompleteAuthToken;
    public IntPtr DeleteUserModeContext;
    public IntPtr FormatCredentials;
    public IntPtr MarshallSupplementalCreds;
    public IntPtr ExportContext;
    public IntPtr ImportContext;
    public IntPtr MarshalAttributeData;
}

Imports System.Runtime.InteropServices

<StructLayout(LayoutKind.Sequential, CharSet:=CharSet.Unicode)>
Public Structure SECPKG_USER_FUNCTION_TABLE
    Public InstanceInit As IntPtr
    Public InitUserModeContext As IntPtr
    Public MakeSignature As IntPtr
    Public VerifySignature As IntPtr
    Public SealMessage As IntPtr
    Public UnsealMessage As IntPtr
    Public GetContextToken As IntPtr
    Public QueryContextAttributesA As IntPtr
    Public CompleteAuthToken As IntPtr
    Public DeleteUserModeContext As IntPtr
    Public FormatCredentials As IntPtr
    Public MarshallSupplementalCreds As IntPtr
    Public ExportContext As IntPtr
    Public ImportContext As IntPtr
    Public MarshalAttributeData As IntPtr
End Structure

import ctypes
from ctypes import wintypes

class SECPKG_USER_FUNCTION_TABLE(ctypes.Structure):
    _fields_ = [
        ("InstanceInit", ctypes.c_void_p),
        ("InitUserModeContext", ctypes.c_void_p),
        ("MakeSignature", ctypes.c_void_p),
        ("VerifySignature", ctypes.c_void_p),
        ("SealMessage", ctypes.c_void_p),
        ("UnsealMessage", ctypes.c_void_p),
        ("GetContextToken", ctypes.c_void_p),
        ("QueryContextAttributesA", ctypes.c_void_p),
        ("CompleteAuthToken", ctypes.c_void_p),
        ("DeleteUserModeContext", ctypes.c_void_p),
        ("FormatCredentials", ctypes.c_void_p),
        ("MarshallSupplementalCreds", ctypes.c_void_p),
        ("ExportContext", ctypes.c_void_p),
        ("ImportContext", ctypes.c_void_p),
        ("MarshalAttributeData", ctypes.c_void_p),
    ]

#[repr(C)]
pub struct SECPKG_USER_FUNCTION_TABLE {
    pub InstanceInit: *mut core::ffi::c_void,
    pub InitUserModeContext: *mut core::ffi::c_void,
    pub MakeSignature: *mut core::ffi::c_void,
    pub VerifySignature: *mut core::ffi::c_void,
    pub SealMessage: *mut core::ffi::c_void,
    pub UnsealMessage: *mut core::ffi::c_void,
    pub GetContextToken: *mut core::ffi::c_void,
    pub QueryContextAttributesA: *mut core::ffi::c_void,
    pub CompleteAuthToken: *mut core::ffi::c_void,
    pub DeleteUserModeContext: *mut core::ffi::c_void,
    pub FormatCredentials: *mut core::ffi::c_void,
    pub MarshallSupplementalCreds: *mut core::ffi::c_void,
    pub ExportContext: *mut core::ffi::c_void,
    pub ImportContext: *mut core::ffi::c_void,
    pub MarshalAttributeData: *mut core::ffi::c_void,
}

import "golang.org/x/sys/windows"

type SECPKG_USER_FUNCTION_TABLE struct {
	InstanceInit uintptr
	InitUserModeContext uintptr
	MakeSignature uintptr
	VerifySignature uintptr
	SealMessage uintptr
	UnsealMessage uintptr
	GetContextToken uintptr
	QueryContextAttributesA uintptr
	CompleteAuthToken uintptr
	DeleteUserModeContext uintptr
	FormatCredentials uintptr
	MarshallSupplementalCreds uintptr
	ExportContext uintptr
	ImportContext uintptr
	MarshalAttributeData uintptr
}

type
  SECPKG_USER_FUNCTION_TABLE = record
    InstanceInit: Pointer;
    InitUserModeContext: Pointer;
    MakeSignature: Pointer;
    VerifySignature: Pointer;
    SealMessage: Pointer;
    UnsealMessage: Pointer;
    GetContextToken: Pointer;
    QueryContextAttributesA: Pointer;
    CompleteAuthToken: Pointer;
    DeleteUserModeContext: Pointer;
    FormatCredentials: Pointer;
    MarshallSupplementalCreds: Pointer;
    ExportContext: Pointer;
    ImportContext: Pointer;
    MarshalAttributeData: Pointer;
  end;

const SECPKG_USER_FUNCTION_TABLE = extern struct {
    InstanceInit: ?*anyopaque,
    InitUserModeContext: ?*anyopaque,
    MakeSignature: ?*anyopaque,
    VerifySignature: ?*anyopaque,
    SealMessage: ?*anyopaque,
    UnsealMessage: ?*anyopaque,
    GetContextToken: ?*anyopaque,
    QueryContextAttributesA: ?*anyopaque,
    CompleteAuthToken: ?*anyopaque,
    DeleteUserModeContext: ?*anyopaque,
    FormatCredentials: ?*anyopaque,
    MarshallSupplementalCreds: ?*anyopaque,
    ExportContext: ?*anyopaque,
    ImportContext: ?*anyopaque,
    MarshalAttributeData: ?*anyopaque,
};

type
  SECPKG_USER_FUNCTION_TABLE {.bycopy.} = object
    InstanceInit: pointer
    InitUserModeContext: pointer
    MakeSignature: pointer
    VerifySignature: pointer
    SealMessage: pointer
    UnsealMessage: pointer
    GetContextToken: pointer
    QueryContextAttributesA: pointer
    CompleteAuthToken: pointer
    DeleteUserModeContext: pointer
    FormatCredentials: pointer
    MarshallSupplementalCreds: pointer
    ExportContext: pointer
    ImportContext: pointer
    MarshalAttributeData: pointer

struct SECPKG_USER_FUNCTION_TABLE
{
    void* InstanceInit;
    void* InitUserModeContext;
    void* MakeSignature;
    void* VerifySignature;
    void* SealMessage;
    void* UnsealMessage;
    void* GetContextToken;
    void* QueryContextAttributesA;
    void* CompleteAuthToken;
    void* DeleteUserModeContext;
    void* FormatCredentials;
    void* MarshallSupplementalCreds;
    void* ExportContext;
    void* ImportContext;
    void* MarshalAttributeData;
}