BCryptDecapsulate

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

NTSTATUS BCryptDecapsulate(
    BCRYPT_KEY_HANDLE hKey,
    BYTE* pbCipherText,
    DWORD cbCipherText,
    BYTE* pbSecretKey,   // optional
    DWORD cbSecretKey,
    DWORD* pcbSecretKey,
    DWORD dwFlags
);

<DllImport("bcrypt.dll", ExactSpelling:=True)>
Public Shared Function BCryptDecapsulate(
    hKey As IntPtr,   ' BCRYPT_KEY_HANDLE
    pbCipherText As IntPtr,   ' BYTE*
    cbCipherText As UInteger,   ' DWORD
    pbSecretKey As IntPtr,   ' BYTE* optional, out
    cbSecretKey As UInteger,   ' DWORD
    <Out> ByRef pcbSecretKey As UInteger,   ' DWORD* out
    dwFlags As UInteger   ' DWORD
) As Integer
End Function

' hKey : BCRYPT_KEY_HANDLE
' pbCipherText : BYTE*
' cbCipherText : DWORD
' pbSecretKey : BYTE* optional, out
' cbSecretKey : DWORD
' pcbSecretKey : DWORD* out
' dwFlags : DWORD
Declare PtrSafe Function BCryptDecapsulate Lib "bcrypt" ( _
    ByVal hKey As LongPtr, _
    ByVal pbCipherText As LongPtr, _
    ByVal cbCipherText As Long, _
    ByVal pbSecretKey As LongPtr, _
    ByVal cbSecretKey As Long, _
    ByRef pcbSecretKey As Long, _
    ByVal dwFlags 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

BCryptDecapsulate = ctypes.windll.bcrypt.BCryptDecapsulate
BCryptDecapsulate.restype = ctypes.c_int
BCryptDecapsulate.argtypes = [
    wintypes.HANDLE,  # hKey : BCRYPT_KEY_HANDLE
    ctypes.POINTER(ctypes.c_ubyte),  # pbCipherText : BYTE*
    wintypes.DWORD,  # cbCipherText : DWORD
    ctypes.POINTER(ctypes.c_ubyte),  # pbSecretKey : BYTE* optional, out
    wintypes.DWORD,  # cbSecretKey : DWORD
    ctypes.POINTER(wintypes.DWORD),  # pcbSecretKey : DWORD* out
    wintypes.DWORD,  # dwFlags : DWORD
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('bcrypt.dll')
BCryptDecapsulate = Fiddle::Function.new(
  lib['BCryptDecapsulate'],
  [
    Fiddle::TYPE_VOIDP,  # hKey : BCRYPT_KEY_HANDLE
    Fiddle::TYPE_VOIDP,  # pbCipherText : BYTE*
    -Fiddle::TYPE_INT,  # cbCipherText : DWORD
    Fiddle::TYPE_VOIDP,  # pbSecretKey : BYTE* optional, out
    -Fiddle::TYPE_INT,  # cbSecretKey : DWORD
    Fiddle::TYPE_VOIDP,  # pcbSecretKey : DWORD* out
    -Fiddle::TYPE_INT,  # dwFlags : DWORD
  ],
  Fiddle::TYPE_INT)

#[link(name = "bcrypt")]
extern "system" {
    fn BCryptDecapsulate(
        hKey: *mut core::ffi::c_void,  // BCRYPT_KEY_HANDLE
        pbCipherText: *mut u8,  // BYTE*
        cbCipherText: u32,  // DWORD
        pbSecretKey: *mut u8,  // BYTE* optional, out
        cbSecretKey: u32,  // DWORD
        pcbSecretKey: *mut u32,  // DWORD* out
        dwFlags: u32  // DWORD
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("bcrypt.dll")]
public static extern int BCryptDecapsulate(IntPtr hKey, IntPtr pbCipherText, uint cbCipherText, IntPtr pbSecretKey, uint cbSecretKey, out uint pcbSecretKey, uint dwFlags);
"@
$api = Add-Type -MemberDefinition $sig -Name 'bcrypt_BCryptDecapsulate' -Namespace Win32 -PassThru
# $api::BCryptDecapsulate(hKey, pbCipherText, cbCipherText, pbSecretKey, cbSecretKey, pcbSecretKey, dwFlags)

#uselib "bcrypt.dll"
#func global BCryptDecapsulate "BCryptDecapsulate" sptr, sptr, sptr, sptr, sptr, sptr, sptr
; BCryptDecapsulate hKey, varptr(pbCipherText), cbCipherText, varptr(pbSecretKey), cbSecretKey, varptr(pcbSecretKey), dwFlags   ; 戻り値は stat
; hKey : BCRYPT_KEY_HANDLE -> "sptr"
; pbCipherText : BYTE* -> "sptr"
; cbCipherText : DWORD -> "sptr"
; pbSecretKey : BYTE* optional, out -> "sptr"
; cbSecretKey : DWORD -> "sptr"
; pcbSecretKey : DWORD* out -> "sptr"
; dwFlags : 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 "bcrypt.dll"
#cfunc global BCryptDecapsulate "BCryptDecapsulate" sptr, var, int, var, int, var, int
; res = BCryptDecapsulate(hKey, pbCipherText, cbCipherText, pbSecretKey, cbSecretKey, pcbSecretKey, dwFlags)
; hKey : BCRYPT_KEY_HANDLE -> "sptr"
; pbCipherText : BYTE* -> "var"
; cbCipherText : DWORD -> "int"
; pbSecretKey : BYTE* optional, out -> "var"
; cbSecretKey : DWORD -> "int"
; pcbSecretKey : DWORD* out -> "var"
; dwFlags : 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。

; NTSTATUS BCryptDecapsulate(BCRYPT_KEY_HANDLE hKey, BYTE* pbCipherText, DWORD cbCipherText, BYTE* pbSecretKey, DWORD cbSecretKey, DWORD* pcbSecretKey, DWORD dwFlags)
#uselib "bcrypt.dll"
#cfunc global BCryptDecapsulate "BCryptDecapsulate" intptr, var, int, var, int, var, int
; res = BCryptDecapsulate(hKey, pbCipherText, cbCipherText, pbSecretKey, cbSecretKey, pcbSecretKey, dwFlags)
; hKey : BCRYPT_KEY_HANDLE -> "intptr"
; pbCipherText : BYTE* -> "var"
; cbCipherText : DWORD -> "int"
; pbSecretKey : BYTE* optional, out -> "var"
; cbSecretKey : DWORD -> "int"
; pcbSecretKey : DWORD* out -> "var"
; dwFlags : 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 (
	bcrypt = windows.NewLazySystemDLL("bcrypt.dll")
	procBCryptDecapsulate = bcrypt.NewProc("BCryptDecapsulate")
)

// hKey (BCRYPT_KEY_HANDLE), pbCipherText (BYTE*), cbCipherText (DWORD), pbSecretKey (BYTE* optional, out), cbSecretKey (DWORD), pcbSecretKey (DWORD* out), dwFlags (DWORD)
r1, _, err := procBCryptDecapsulate.Call(
	uintptr(hKey),
	uintptr(pbCipherText),
	uintptr(cbCipherText),
	uintptr(pbSecretKey),
	uintptr(cbSecretKey),
	uintptr(pcbSecretKey),
	uintptr(dwFlags),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // NTSTATUS

function BCryptDecapsulate(
  hKey: THandle;   // BCRYPT_KEY_HANDLE
  pbCipherText: Pointer;   // BYTE*
  cbCipherText: DWORD;   // DWORD
  pbSecretKey: Pointer;   // BYTE* optional, out
  cbSecretKey: DWORD;   // DWORD
  pcbSecretKey: Pointer;   // DWORD* out
  dwFlags: DWORD   // DWORD
): Integer; stdcall;
  external 'bcrypt.dll' name 'BCryptDecapsulate';

result := DllCall("bcrypt\BCryptDecapsulate"
    , "Ptr", hKey   ; BCRYPT_KEY_HANDLE
    , "Ptr", pbCipherText   ; BYTE*
    , "UInt", cbCipherText   ; DWORD
    , "Ptr", pbSecretKey   ; BYTE* optional, out
    , "UInt", cbSecretKey   ; DWORD
    , "Ptr", pcbSecretKey   ; DWORD* out
    , "UInt", dwFlags   ; DWORD
    , "Int")   ; return: NTSTATUS

●BCryptDecapsulate(hKey, pbCipherText, cbCipherText, pbSecretKey, cbSecretKey, pcbSecretKey, dwFlags) = DLL("bcrypt.dll", "int BCryptDecapsulate(void*, void*, dword, void*, dword, void*, dword)")
# 呼び出し: BCryptDecapsulate(hKey, pbCipherText, cbCipherText, pbSecretKey, cbSecretKey, pcbSecretKey, dwFlags)
# hKey : BCRYPT_KEY_HANDLE -> "void*"
# pbCipherText : BYTE* -> "void*"
# cbCipherText : DWORD -> "dword"
# pbSecretKey : BYTE* optional, out -> "void*"
# cbSecretKey : DWORD -> "dword"
# pcbSecretKey : DWORD* out -> "void*"
# dwFlags : 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)。