SslGetServerIdentity

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

HRESULT SslGetServerIdentity(
    BYTE* ClientHello,
    DWORD ClientHelloSize,
    BYTE** ServerIdentity,
    DWORD* ServerIdentitySize,
    DWORD Flags
);

<DllImport("SCHANNEL.dll", ExactSpelling:=True)>
Public Shared Function SslGetServerIdentity(
    ClientHello As IntPtr,   ' BYTE*
    ClientHelloSize As UInteger,   ' DWORD
    ServerIdentity As IntPtr,   ' BYTE** out
    <Out> ByRef ServerIdentitySize As UInteger,   ' DWORD* out
    Flags As UInteger   ' DWORD
) As Integer
End Function

' ClientHello : BYTE*
' ClientHelloSize : DWORD
' ServerIdentity : BYTE** out
' ServerIdentitySize : DWORD* out
' Flags : DWORD
Declare PtrSafe Function SslGetServerIdentity Lib "schannel" ( _
    ByVal ClientHello As LongPtr, _
    ByVal ClientHelloSize As Long, _
    ByVal ServerIdentity As LongPtr, _
    ByRef ServerIdentitySize 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

SslGetServerIdentity = ctypes.windll.schannel.SslGetServerIdentity
SslGetServerIdentity.restype = ctypes.c_int
SslGetServerIdentity.argtypes = [
    ctypes.POINTER(ctypes.c_ubyte),  # ClientHello : BYTE*
    wintypes.DWORD,  # ClientHelloSize : DWORD
    ctypes.c_void_p,  # ServerIdentity : BYTE** out
    ctypes.POINTER(wintypes.DWORD),  # ServerIdentitySize : DWORD* out
    wintypes.DWORD,  # Flags : DWORD
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('SCHANNEL.dll')
SslGetServerIdentity = Fiddle::Function.new(
  lib['SslGetServerIdentity'],
  [
    Fiddle::TYPE_VOIDP,  # ClientHello : BYTE*
    -Fiddle::TYPE_INT,  # ClientHelloSize : DWORD
    Fiddle::TYPE_VOIDP,  # ServerIdentity : BYTE** out
    Fiddle::TYPE_VOIDP,  # ServerIdentitySize : DWORD* out
    -Fiddle::TYPE_INT,  # Flags : DWORD
  ],
  Fiddle::TYPE_INT)

#[link(name = "schannel")]
extern "system" {
    fn SslGetServerIdentity(
        ClientHello: *mut u8,  // BYTE*
        ClientHelloSize: u32,  // DWORD
        ServerIdentity: *mut *mut u8,  // BYTE** out
        ServerIdentitySize: *mut u32,  // DWORD* out
        Flags: u32  // DWORD
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("SCHANNEL.dll")]
public static extern int SslGetServerIdentity(IntPtr ClientHello, uint ClientHelloSize, IntPtr ServerIdentity, out uint ServerIdentitySize, uint Flags);
"@
$api = Add-Type -MemberDefinition $sig -Name 'SCHANNEL_SslGetServerIdentity' -Namespace Win32 -PassThru
# $api::SslGetServerIdentity(ClientHello, ClientHelloSize, ServerIdentity, ServerIdentitySize, Flags)

#uselib "SCHANNEL.dll"
#func global SslGetServerIdentity "SslGetServerIdentity" sptr, sptr, sptr, sptr, sptr
; SslGetServerIdentity varptr(ClientHello), ClientHelloSize, varptr(ServerIdentity), varptr(ServerIdentitySize), Flags   ; 戻り値は stat
; ClientHello : BYTE* -> "sptr"
; ClientHelloSize : DWORD -> "sptr"
; ServerIdentity : BYTE** out -> "sptr"
; ServerIdentitySize : DWORD* out -> "sptr"
; Flags : DWORD -> "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。

#uselib "SCHANNEL.dll"
#cfunc global SslGetServerIdentity "SslGetServerIdentity" var, int, var, var, int
; res = SslGetServerIdentity(ClientHello, ClientHelloSize, ServerIdentity, ServerIdentitySize, Flags)
; ClientHello : BYTE* -> "var"
; ClientHelloSize : DWORD -> "int"
; ServerIdentity : BYTE** out -> "var"
; ServerIdentitySize : DWORD* out -> "var"
; Flags : DWORD -> "int"
; ※出力/バッファ引数は var 方式(変数を直接渡す)。varptr 方式にも切替可。

; HRESULT SslGetServerIdentity(BYTE* ClientHello, DWORD ClientHelloSize, BYTE** ServerIdentity, DWORD* ServerIdentitySize, DWORD Flags)
#uselib "SCHANNEL.dll"
#cfunc global SslGetServerIdentity "SslGetServerIdentity" var, int, var, var, int
; res = SslGetServerIdentity(ClientHello, ClientHelloSize, ServerIdentity, ServerIdentitySize, Flags)
; ClientHello : BYTE* -> "var"
; ClientHelloSize : DWORD -> "int"
; ServerIdentity : BYTE** out -> "var"
; ServerIdentitySize : DWORD* out -> "var"
; Flags : DWORD -> "int"
; ※出力/バッファ引数は var 方式(変数を直接渡す)。varptr 方式にも切替可。

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

var (
	schannel = windows.NewLazySystemDLL("SCHANNEL.dll")
	procSslGetServerIdentity = schannel.NewProc("SslGetServerIdentity")
)

// ClientHello (BYTE*), ClientHelloSize (DWORD), ServerIdentity (BYTE** out), ServerIdentitySize (DWORD* out), Flags (DWORD)
r1, _, err := procSslGetServerIdentity.Call(
	uintptr(ClientHello),
	uintptr(ClientHelloSize),
	uintptr(ServerIdentity),
	uintptr(ServerIdentitySize),
	uintptr(Flags),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function SslGetServerIdentity(
  ClientHello: Pointer;   // BYTE*
  ClientHelloSize: DWORD;   // DWORD
  ServerIdentity: Pointer;   // BYTE** out
  ServerIdentitySize: Pointer;   // DWORD* out
  Flags: DWORD   // DWORD
): Integer; stdcall;
  external 'SCHANNEL.dll' name 'SslGetServerIdentity';

result := DllCall("SCHANNEL\SslGetServerIdentity"
    , "Ptr", ClientHello   ; BYTE*
    , "UInt", ClientHelloSize   ; DWORD
    , "Ptr", ServerIdentity   ; BYTE** out
    , "Ptr", ServerIdentitySize   ; DWORD* out
    , "UInt", Flags   ; DWORD
    , "Int")   ; return: HRESULT

●SslGetServerIdentity(ClientHello, ClientHelloSize, ServerIdentity, ServerIdentitySize, Flags) = DLL("SCHANNEL.dll", "int SslGetServerIdentity(void*, dword, void*, void*, dword)")
# 呼び出し: SslGetServerIdentity(ClientHello, ClientHelloSize, ServerIdentity, ServerIdentitySize, Flags)
# ClientHello : BYTE* -> "void*"
# ClientHelloSize : DWORD -> "dword"
# ServerIdentity : BYTE** out -> "void*"
# ServerIdentitySize : DWORD* out -> "void*"
# Flags : DWORD -> "dword"
# 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)。