BCryptExportKey

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

NTSTATUS BCryptExportKey(
    BCRYPT_KEY_HANDLE hKey,
    BCRYPT_KEY_HANDLE hExportKey,   // optional
    LPCWSTR pszBlobType,
    BYTE* pbOutput,   // optional
    DWORD cbOutput,
    DWORD* pcbResult,
    DWORD dwFlags
);

<DllImport("bcrypt.dll", ExactSpelling:=True)>
Public Shared Function BCryptExportKey(
    hKey As IntPtr,   ' BCRYPT_KEY_HANDLE
    hExportKey As IntPtr,   ' BCRYPT_KEY_HANDLE optional
    <MarshalAs(UnmanagedType.LPWStr)> pszBlobType As String,   ' LPCWSTR
    pbOutput As IntPtr,   ' BYTE* optional, out
    cbOutput As UInteger,   ' DWORD
    <Out> ByRef pcbResult As UInteger,   ' DWORD* out
    dwFlags As UInteger   ' DWORD
) As Integer
End Function

' hKey : BCRYPT_KEY_HANDLE
' hExportKey : BCRYPT_KEY_HANDLE optional
' pszBlobType : LPCWSTR
' pbOutput : BYTE* optional, out
' cbOutput : DWORD
' pcbResult : DWORD* out
' dwFlags : DWORD
Declare PtrSafe Function BCryptExportKey Lib "bcrypt" ( _
    ByVal hKey As LongPtr, _
    ByVal hExportKey As LongPtr, _
    ByVal pszBlobType As LongPtr, _
    ByVal pbOutput As LongPtr, _
    ByVal cbOutput As Long, _
    ByRef pcbResult 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

BCryptExportKey = ctypes.windll.bcrypt.BCryptExportKey
BCryptExportKey.restype = ctypes.c_int
BCryptExportKey.argtypes = [
    wintypes.HANDLE,  # hKey : BCRYPT_KEY_HANDLE
    wintypes.HANDLE,  # hExportKey : BCRYPT_KEY_HANDLE optional
    wintypes.LPCWSTR,  # pszBlobType : LPCWSTR
    ctypes.POINTER(ctypes.c_ubyte),  # pbOutput : BYTE* optional, out
    wintypes.DWORD,  # cbOutput : DWORD
    ctypes.POINTER(wintypes.DWORD),  # pcbResult : DWORD* out
    wintypes.DWORD,  # dwFlags : DWORD
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('bcrypt.dll')
BCryptExportKey = Fiddle::Function.new(
  lib['BCryptExportKey'],
  [
    Fiddle::TYPE_VOIDP,  # hKey : BCRYPT_KEY_HANDLE
    Fiddle::TYPE_VOIDP,  # hExportKey : BCRYPT_KEY_HANDLE optional
    Fiddle::TYPE_VOIDP,  # pszBlobType : LPCWSTR
    Fiddle::TYPE_VOIDP,  # pbOutput : BYTE* optional, out
    -Fiddle::TYPE_INT,  # cbOutput : DWORD
    Fiddle::TYPE_VOIDP,  # pcbResult : DWORD* out
    -Fiddle::TYPE_INT,  # dwFlags : DWORD
  ],
  Fiddle::TYPE_INT)

#[link(name = "bcrypt")]
extern "system" {
    fn BCryptExportKey(
        hKey: *mut core::ffi::c_void,  // BCRYPT_KEY_HANDLE
        hExportKey: *mut core::ffi::c_void,  // BCRYPT_KEY_HANDLE optional
        pszBlobType: *const u16,  // LPCWSTR
        pbOutput: *mut u8,  // BYTE* optional, out
        cbOutput: u32,  // DWORD
        pcbResult: *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 BCryptExportKey(IntPtr hKey, IntPtr hExportKey, [MarshalAs(UnmanagedType.LPWStr)] string pszBlobType, IntPtr pbOutput, uint cbOutput, out uint pcbResult, uint dwFlags);
"@
$api = Add-Type -MemberDefinition $sig -Name 'bcrypt_BCryptExportKey' -Namespace Win32 -PassThru
# $api::BCryptExportKey(hKey, hExportKey, pszBlobType, pbOutput, cbOutput, pcbResult, dwFlags)

#uselib "bcrypt.dll"
#func global BCryptExportKey "BCryptExportKey" sptr, sptr, sptr, sptr, sptr, sptr, sptr
; BCryptExportKey hKey, hExportKey, pszBlobType, varptr(pbOutput), cbOutput, varptr(pcbResult), dwFlags   ; 戻り値は stat
; hKey : BCRYPT_KEY_HANDLE -> "sptr"
; hExportKey : BCRYPT_KEY_HANDLE optional -> "sptr"
; pszBlobType : LPCWSTR -> "sptr"
; pbOutput : BYTE* optional, out -> "sptr"
; cbOutput : DWORD -> "sptr"
; pcbResult : 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 BCryptExportKey "BCryptExportKey" sptr, sptr, wstr, var, int, var, int
; res = BCryptExportKey(hKey, hExportKey, pszBlobType, pbOutput, cbOutput, pcbResult, dwFlags)
; hKey : BCRYPT_KEY_HANDLE -> "sptr"
; hExportKey : BCRYPT_KEY_HANDLE optional -> "sptr"
; pszBlobType : LPCWSTR -> "wstr"
; pbOutput : BYTE* optional, out -> "var"
; cbOutput : DWORD -> "int"
; pcbResult : 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 BCryptExportKey(BCRYPT_KEY_HANDLE hKey, BCRYPT_KEY_HANDLE hExportKey, LPCWSTR pszBlobType, BYTE* pbOutput, DWORD cbOutput, DWORD* pcbResult, DWORD dwFlags)
#uselib "bcrypt.dll"
#cfunc global BCryptExportKey "BCryptExportKey" intptr, intptr, wstr, var, int, var, int
; res = BCryptExportKey(hKey, hExportKey, pszBlobType, pbOutput, cbOutput, pcbResult, dwFlags)
; hKey : BCRYPT_KEY_HANDLE -> "intptr"
; hExportKey : BCRYPT_KEY_HANDLE optional -> "intptr"
; pszBlobType : LPCWSTR -> "wstr"
; pbOutput : BYTE* optional, out -> "var"
; cbOutput : DWORD -> "int"
; pcbResult : 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")
	procBCryptExportKey = bcrypt.NewProc("BCryptExportKey")
)

// hKey (BCRYPT_KEY_HANDLE), hExportKey (BCRYPT_KEY_HANDLE optional), pszBlobType (LPCWSTR), pbOutput (BYTE* optional, out), cbOutput (DWORD), pcbResult (DWORD* out), dwFlags (DWORD)
r1, _, err := procBCryptExportKey.Call(
	uintptr(hKey),
	uintptr(hExportKey),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(pszBlobType))),
	uintptr(pbOutput),
	uintptr(cbOutput),
	uintptr(pcbResult),
	uintptr(dwFlags),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // NTSTATUS

function BCryptExportKey(
  hKey: THandle;   // BCRYPT_KEY_HANDLE
  hExportKey: THandle;   // BCRYPT_KEY_HANDLE optional
  pszBlobType: PWideChar;   // LPCWSTR
  pbOutput: Pointer;   // BYTE* optional, out
  cbOutput: DWORD;   // DWORD
  pcbResult: Pointer;   // DWORD* out
  dwFlags: DWORD   // DWORD
): Integer; stdcall;
  external 'bcrypt.dll' name 'BCryptExportKey';

result := DllCall("bcrypt\BCryptExportKey"
    , "Ptr", hKey   ; BCRYPT_KEY_HANDLE
    , "Ptr", hExportKey   ; BCRYPT_KEY_HANDLE optional
    , "WStr", pszBlobType   ; LPCWSTR
    , "Ptr", pbOutput   ; BYTE* optional, out
    , "UInt", cbOutput   ; DWORD
    , "Ptr", pcbResult   ; DWORD* out
    , "UInt", dwFlags   ; DWORD
    , "Int")   ; return: NTSTATUS

●BCryptExportKey(hKey, hExportKey, pszBlobType, pbOutput, cbOutput, pcbResult, dwFlags) = DLL("bcrypt.dll", "int BCryptExportKey(void*, void*, char*, void*, dword, void*, dword)")
# 呼び出し: BCryptExportKey(hKey, hExportKey, pszBlobType, pbOutput, cbOutput, pcbResult, dwFlags)
# hKey : BCRYPT_KEY_HANDLE -> "void*"
# hExportKey : BCRYPT_KEY_HANDLE optional -> "void*"
# pszBlobType : LPCWSTR -> "char*"
# pbOutput : BYTE* optional, out -> "void*"
# cbOutput : DWORD -> "dword"
# pcbResult : 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)。