SslGetExtensions

// SCHANNEL.dll
#include <windows.h>

HRESULT SslGetExtensions(
    const BYTE* clientHello,
    DWORD clientHelloByteSize,
    SCH_EXTENSION_DATA* genericExtensions,
    BYTE genericExtensionsCount,
    DWORD* bytesToRead,
    SchGetExtensionsOptions flags
);

<DllImport("SCHANNEL.dll", ExactSpelling:=True)>
Public Shared Function SslGetExtensions(
    clientHello As IntPtr,   ' BYTE*
    clientHelloByteSize As UInteger,   ' DWORD
    genericExtensions As IntPtr,   ' SCH_EXTENSION_DATA* in/out
    genericExtensionsCount As Byte,   ' BYTE
    <Out> ByRef bytesToRead As UInteger,   ' DWORD* out
    flags As Integer   ' SchGetExtensionsOptions
) As Integer
End Function

' clientHello : BYTE*
' clientHelloByteSize : DWORD
' genericExtensions : SCH_EXTENSION_DATA* in/out
' genericExtensionsCount : BYTE
' bytesToRead : DWORD* out
' flags : SchGetExtensionsOptions
Declare PtrSafe Function SslGetExtensions Lib "schannel" ( _
    ByVal clientHello As LongPtr, _
    ByVal clientHelloByteSize As Long, _
    ByVal genericExtensions As LongPtr, _
    ByVal genericExtensionsCount As Byte, _
    ByRef bytesToRead As Long, _
    ByVal flags As Long) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

SslGetExtensions = ctypes.windll.schannel.SslGetExtensions
SslGetExtensions.restype = ctypes.c_int
SslGetExtensions.argtypes = [
    ctypes.POINTER(ctypes.c_ubyte),  # clientHello : BYTE*
    wintypes.DWORD,  # clientHelloByteSize : DWORD
    ctypes.c_void_p,  # genericExtensions : SCH_EXTENSION_DATA* in/out
    ctypes.c_ubyte,  # genericExtensionsCount : BYTE
    ctypes.POINTER(wintypes.DWORD),  # bytesToRead : DWORD* out
    ctypes.c_int,  # flags : SchGetExtensionsOptions
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('SCHANNEL.dll')
SslGetExtensions = Fiddle::Function.new(
  lib['SslGetExtensions'],
  [
    Fiddle::TYPE_VOIDP,  # clientHello : BYTE*
    -Fiddle::TYPE_INT,  # clientHelloByteSize : DWORD
    Fiddle::TYPE_VOIDP,  # genericExtensions : SCH_EXTENSION_DATA* in/out
    -Fiddle::TYPE_CHAR,  # genericExtensionsCount : BYTE
    Fiddle::TYPE_VOIDP,  # bytesToRead : DWORD* out
    Fiddle::TYPE_INT,  # flags : SchGetExtensionsOptions
  ],
  Fiddle::TYPE_INT)

#[link(name = "schannel")]
extern "system" {
    fn SslGetExtensions(
        clientHello: *const u8,  // BYTE*
        clientHelloByteSize: u32,  // DWORD
        genericExtensions: *mut SCH_EXTENSION_DATA,  // SCH_EXTENSION_DATA* in/out
        genericExtensionsCount: u8,  // BYTE
        bytesToRead: *mut u32,  // DWORD* out
        flags: i32  // SchGetExtensionsOptions
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("SCHANNEL.dll")]
public static extern int SslGetExtensions(IntPtr clientHello, uint clientHelloByteSize, IntPtr genericExtensions, byte genericExtensionsCount, out uint bytesToRead, int flags);
"@
$api = Add-Type -MemberDefinition $sig -Name 'SCHANNEL_SslGetExtensions' -Namespace Win32 -PassThru
# $api::SslGetExtensions(clientHello, clientHelloByteSize, genericExtensions, genericExtensionsCount, bytesToRead, flags)

#uselib "SCHANNEL.dll"
#func global SslGetExtensions "SslGetExtensions" sptr, sptr, sptr, sptr, sptr, sptr
; SslGetExtensions varptr(clientHello), clientHelloByteSize, varptr(genericExtensions), genericExtensionsCount, varptr(bytesToRead), flags   ; 戻り値は stat
; clientHello : BYTE* -> "sptr"
; clientHelloByteSize : DWORD -> "sptr"
; genericExtensions : SCH_EXTENSION_DATA* in/out -> "sptr"
; genericExtensionsCount : BYTE -> "sptr"
; bytesToRead : DWORD* out -> "sptr"
; flags : SchGetExtensionsOptions -> "sptr"
; ※HSP3.7は #func のため戻り値はシステム変数 stat に格納されます。

import (
	"golang.org/x/sys/windows"
	"unsafe"
)

var (
	schannel = windows.NewLazySystemDLL("SCHANNEL.dll")
	procSslGetExtensions = schannel.NewProc("SslGetExtensions")
)

// clientHello (BYTE*), clientHelloByteSize (DWORD), genericExtensions (SCH_EXTENSION_DATA* in/out), genericExtensionsCount (BYTE), bytesToRead (DWORD* out), flags (SchGetExtensionsOptions)
r1, _, err := procSslGetExtensions.Call(
	uintptr(clientHello),
	uintptr(clientHelloByteSize),
	uintptr(genericExtensions),
	uintptr(genericExtensionsCount),
	uintptr(bytesToRead),
	uintptr(flags),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function SslGetExtensions(
  clientHello: Pointer;   // BYTE*
  clientHelloByteSize: DWORD;   // DWORD
  genericExtensions: Pointer;   // SCH_EXTENSION_DATA* in/out
  genericExtensionsCount: Byte;   // BYTE
  bytesToRead: Pointer;   // DWORD* out
  flags: Integer   // SchGetExtensionsOptions
): Integer; stdcall;
  external 'SCHANNEL.dll' name 'SslGetExtensions';

result := DllCall("SCHANNEL\SslGetExtensions"
    , "Ptr", clientHello   ; BYTE*
    , "UInt", clientHelloByteSize   ; DWORD
    , "Ptr", genericExtensions   ; SCH_EXTENSION_DATA* in/out
    , "UChar", genericExtensionsCount   ; BYTE
    , "Ptr", bytesToRead   ; DWORD* out
    , "Int", flags   ; SchGetExtensionsOptions
    , "Int")   ; return: HRESULT

●SslGetExtensions(clientHello, clientHelloByteSize, genericExtensions, genericExtensionsCount, bytesToRead, flags) = DLL("SCHANNEL.dll", "int SslGetExtensions(void*, dword, void*, byte, void*, int)")
# 呼び出し: SslGetExtensions(clientHello, clientHelloByteSize, genericExtensions, genericExtensionsCount, bytesToRead, flags)
# clientHello : BYTE* -> "void*"
# clientHelloByteSize : DWORD -> "dword"
# genericExtensions : SCH_EXTENSION_DATA* in/out -> "void*"
# genericExtensionsCount : BYTE -> "byte"
# bytesToRead : DWORD* out -> "void*"
# flags : SchGetExtensionsOptions -> "int"
# なでしこ1は32bit・ANSI(Shift_JIS)。文字列=char*(ANSI)、ポインタ/ハンドル=void*(4byte)。

const std = @import("std");

extern "schannel" fn SslGetExtensions(
    clientHello: [*c]u8, // BYTE*
    clientHelloByteSize: u32, // DWORD
    genericExtensions: [*c]SCH_EXTENSION_DATA, // SCH_EXTENSION_DATA* in/out
    genericExtensionsCount: u8, // BYTE
    bytesToRead: [*c]u32, // DWORD* out
    flags: i32 // SchGetExtensionsOptions
) callconv(std.os.windows.WINAPI) i32;

proc SslGetExtensions(
    clientHello: ptr uint8,  # BYTE*
    clientHelloByteSize: uint32,  # DWORD
    genericExtensions: ptr SCH_EXTENSION_DATA,  # SCH_EXTENSION_DATA* in/out
    genericExtensionsCount: uint8,  # BYTE
    bytesToRead: ptr uint32,  # DWORD* out
    flags: int32  # SchGetExtensionsOptions
): int32 {.importc: "SslGetExtensions", stdcall, dynlib: "SCHANNEL.dll".}

pragma(lib, "schannel");
extern(Windows)
int SslGetExtensions(
    ubyte* clientHello,   // BYTE*
    uint clientHelloByteSize,   // DWORD
    SCH_EXTENSION_DATA* genericExtensions,   // SCH_EXTENSION_DATA* in/out
    ubyte genericExtensionsCount,   // BYTE
    uint* bytesToRead,   // DWORD* out
    int flags   // SchGetExtensionsOptions
);

ccall((:SslGetExtensions, "SCHANNEL.dll"), stdcall, Int32,
      (Ptr{UInt8}, UInt32, Ptr{SCH_EXTENSION_DATA}, UInt8, Ptr{UInt32}, Int32),
      clientHello, clientHelloByteSize, genericExtensions, genericExtensionsCount, bytesToRead, flags)
# clientHello : BYTE* -> Ptr{UInt8}
# clientHelloByteSize : DWORD -> UInt32
# genericExtensions : SCH_EXTENSION_DATA* in/out -> Ptr{SCH_EXTENSION_DATA}
# genericExtensionsCount : BYTE -> UInt8
# bytesToRead : DWORD* out -> Ptr{UInt32}
# flags : SchGetExtensionsOptions -> Int32
# stdcall は 32bit のみ意味を持つ(x64 では無視)。

local ffi = require("ffi")
ffi.cdef[[
int32_t SslGetExtensions(
    uint8_t* clientHello,
    uint32_t clientHelloByteSize,
    void* genericExtensions,
    uint8_t genericExtensionsCount,
    uint32_t* bytesToRead,
    int32_t flags);
]]
local schannel = ffi.load("schannel")
-- schannel.SslGetExtensions(clientHello, clientHelloByteSize, genericExtensions, genericExtensionsCount, bytesToRead, flags)
-- clientHello : BYTE*
-- clientHelloByteSize : DWORD
-- genericExtensions : SCH_EXTENSION_DATA* in/out
-- genericExtensionsCount : BYTE
-- bytesToRead : DWORD* out
-- flags : SchGetExtensionsOptions
-- 構造体/GUIDへのポインタは cdef が通るよう void* で表記(実型は各引数コメント参照)。値渡し構造体・enum は対応する typedef を cdef に追加すること。

const koffi = require('koffi');
const lib = koffi.load('SCHANNEL.dll');
const SslGetExtensions = lib.func('__stdcall', 'SslGetExtensions', 'int32_t', ['uint8_t *', 'uint32_t', 'void *', 'uint8_t', 'uint32_t *', 'int32_t']);
// SslGetExtensions(clientHello, clientHelloByteSize, genericExtensions, genericExtensionsCount, bytesToRead, flags)
// clientHello : BYTE* -> 'uint8_t *'
// clientHelloByteSize : DWORD -> 'uint32_t'
// genericExtensions : SCH_EXTENSION_DATA* in/out -> 'void *'
// genericExtensionsCount : BYTE -> 'uint8_t'
// bytesToRead : DWORD* out -> 'uint32_t *'
// flags : SchGetExtensionsOptions -> 'int32_t'
// 出力ポインタは koffi.out(...) で包む。構造体は koffi.struct で定義。

const lib = Deno.dlopen("SCHANNEL.dll", {
  SslGetExtensions: { parameters: ["pointer", "u32", "pointer", "u8", "pointer", "i32"], result: "i32" },
});
// lib.symbols.SslGetExtensions(clientHello, clientHelloByteSize, genericExtensions, genericExtensionsCount, bytesToRead, flags)
// clientHello : BYTE* -> "pointer"
// clientHelloByteSize : DWORD -> "u32"
// genericExtensions : SCH_EXTENSION_DATA* in/out -> "pointer"
// genericExtensionsCount : BYTE -> "u8"
// bytesToRead : DWORD* out -> "pointer"
// flags : SchGetExtensionsOptions -> "i32"
// 文字列引数は "buffer"(NUL 終端のバイト列を Uint8Array で渡す)。
// 値渡し構造体は { struct: [ ...field types... ] } を使用。

<?php
$ffi = FFI::cdef(<<<C
int32_t SslGetExtensions(
    uint8_t* clientHello,
    uint32_t clientHelloByteSize,
    void* genericExtensions,
    uint8_t genericExtensionsCount,
    uint32_t* bytesToRead,
    int32_t flags);
C, "SCHANNEL.dll");
// $ffi->SslGetExtensions(clientHello, clientHelloByteSize, genericExtensions, genericExtensionsCount, bytesToRead, flags);
// clientHello : BYTE*
// clientHelloByteSize : DWORD
// genericExtensions : SCH_EXTENSION_DATA* in/out
// genericExtensionsCount : BYTE
// bytesToRead : DWORD* out
// flags : SchGetExtensionsOptions
// 構造体/GUIDへのポインタは cdef が通るよう void* で表記(実型は各引数コメント参照)。値渡し構造体・enum は対応する typedef を cdef に追加すること。
// WINAPI(stdcall): x64 では呼出規約が統一されるため問題なし。x86 では __stdcall 対応のラッパが必要な場合あり。

import com.sun.jna.*;
import com.sun.jna.ptr.*;
import com.sun.jna.win32.StdCallLibrary;
import com.sun.jna.win32.W32APIOptions;

public interface Schannel extends StdCallLibrary {
    Schannel INSTANCE = Native.load("schannel", Schannel.class);
    int SslGetExtensions(
        byte[] clientHello,   // BYTE*
        int clientHelloByteSize,   // DWORD
        Pointer genericExtensions,   // SCH_EXTENSION_DATA* in/out
        byte genericExtensionsCount,   // BYTE
        IntByReference bytesToRead,   // DWORD* out
        int flags   // SchGetExtensionsOptions
    );
}

@[Link("schannel")]
lib LibSCHANNEL
  fun SslGetExtensions = SslGetExtensions(
    clientHello : UInt8*,   # BYTE*
    clientHelloByteSize : UInt32,   # DWORD
    genericExtensions : SCH_EXTENSION_DATA*,   # SCH_EXTENSION_DATA* in/out
    genericExtensionsCount : UInt8,   # BYTE
    bytesToRead : UInt32*,   # DWORD* out
    flags : Int32   # SchGetExtensionsOptions
  ) : Int32
end
# 構造体/GUID/enum は lib 内に対応する型定義が必要。
# 呼出規約: x64 は規約統一のため OK。x86(32bit)は WINAPI=stdcall だが Crystal の fun に stdcall 付与構文がなく非対応。

import 'dart:ffi';
import 'package:ffi/ffi.dart';

typedef SslGetExtensionsNative = Int32 Function(Pointer<Uint8>, Uint32, Pointer<Void>, Uint8, Pointer<Uint32>, Int32);
typedef SslGetExtensionsDart = int Function(Pointer<Uint8>, int, Pointer<Void>, int, Pointer<Uint32>, int);
final SslGetExtensions = DynamicLibrary.open('SCHANNEL.dll')
    .lookupFunction<SslGetExtensionsNative, SslGetExtensionsDart>('SslGetExtensions');
// clientHello : BYTE* -> Pointer<Uint8>
// clientHelloByteSize : DWORD -> Uint32
// genericExtensions : SCH_EXTENSION_DATA* in/out -> Pointer<Void>
// genericExtensionsCount : BYTE -> Uint8
// bytesToRead : DWORD* out -> Pointer<Uint32>
// flags : SchGetExtensionsOptions -> Int32
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
function SslGetExtensions(
  clientHello: Pointer;   // BYTE*
  clientHelloByteSize: DWORD;   // DWORD
  genericExtensions: Pointer;   // SCH_EXTENSION_DATA* in/out
  genericExtensionsCount: Byte;   // BYTE
  bytesToRead: Pointer;   // DWORD* out
  flags: Integer   // SchGetExtensionsOptions
): Integer; stdcall;
  external 'SCHANNEL.dll' name 'SslGetExtensions';

import Foreign
import Foreign.C.Types
import Foreign.C.String

foreign import stdcall safe "SslGetExtensions"
  c_SslGetExtensions :: Ptr Word8 -> Word32 -> Ptr () -> Word8 -> Ptr Word32 -> Int32 -> IO Int32
-- clientHello : BYTE* -> Ptr Word8
-- clientHelloByteSize : DWORD -> Word32
-- genericExtensions : SCH_EXTENSION_DATA* in/out -> Ptr ()
-- genericExtensionsCount : BYTE -> Word8
-- bytesToRead : DWORD* out -> Ptr Word32
-- flags : SchGetExtensionsOptions -> Int32
-- 要 GHC(Windows)。stdcall は x64 では ccall として扱われる。ブロックする API は safe 呼び出し推奨。

open Ctypes
open Foreign

let sslgetextensions =
  foreign "SslGetExtensions"
    ((ptr uint8_t) @-> uint32_t @-> (ptr void) @-> uint8_t @-> (ptr uint32_t) @-> int32_t @-> returning int32_t)
(* clientHello : BYTE* -> (ptr uint8_t) *)
(* clientHelloByteSize : DWORD -> uint32_t *)
(* genericExtensions : SCH_EXTENSION_DATA* in/out -> (ptr void) *)
(* genericExtensionsCount : BYTE -> uint8_t *)
(* bytesToRead : DWORD* out -> (ptr uint32_t) *)
(* flags : SchGetExtensionsOptions -> int32_t *)
(* foreign は cdecl 前提。x64 Windows では WINAPI と一致。構造体は ctypes structure を定義のこと。 *)

(cffi:define-foreign-library schannel (t "SCHANNEL.dll"))
(cffi:use-foreign-library schannel)

(cffi:defcfun ("SslGetExtensions" ssl-get-extensions :convention :stdcall) :int32
  (client-hello :pointer)   ; BYTE*
  (client-hello-byte-size :uint32)   ; DWORD
  (generic-extensions :pointer)   ; SCH_EXTENSION_DATA* in/out
  (generic-extensions-count :uint8)   ; BYTE
  (bytes-to-read :pointer)   ; DWORD* out
  (flags :int32))   ; SchGetExtensionsOptions
; isize/usize(INT_PTR/SIZE_T)は x64 前提で :int64/:uint64。x86 では :int32/:uint32。

use Win32::API;
my $SslGetExtensions = Win32::API::More->new('SCHANNEL',
    'int SslGetExtensions(LPVOID clientHello, DWORD clientHelloByteSize, LPVOID genericExtensions, BYTE genericExtensionsCount, LPVOID bytesToRead, int flags)');
# my $ret = $SslGetExtensions->Call($clientHello, $clientHelloByteSize, $genericExtensions, $genericExtensionsCount, $bytesToRead, $flags);
# clientHello : BYTE* -> LPVOID
# clientHelloByteSize : DWORD -> DWORD
# genericExtensions : SCH_EXTENSION_DATA* in/out -> LPVOID
# genericExtensionsCount : BYTE -> BYTE
# bytesToRead : DWORD* out -> LPVOID
# flags : SchGetExtensionsOptions -> int
# 値渡し構造体は pack() した文字列、または Win32::API::Struct を使用。