BCryptGenerateKeyPair

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

NTSTATUS BCryptGenerateKeyPair(
    BCRYPT_ALG_HANDLE hAlgorithm,
    BCRYPT_KEY_HANDLE* phKey,
    DWORD dwLength,
    DWORD dwFlags
);

<DllImport("bcrypt.dll", ExactSpelling:=True)>
Public Shared Function BCryptGenerateKeyPair(
    hAlgorithm As IntPtr,   ' BCRYPT_ALG_HANDLE in/out
    phKey As IntPtr,   ' BCRYPT_KEY_HANDLE* out
    dwLength As UInteger,   ' DWORD
    dwFlags As UInteger   ' DWORD
) As Integer
End Function

' hAlgorithm : BCRYPT_ALG_HANDLE in/out
' phKey : BCRYPT_KEY_HANDLE* out
' dwLength : DWORD
' dwFlags : DWORD
Declare PtrSafe Function BCryptGenerateKeyPair Lib "bcrypt" ( _
    ByVal hAlgorithm As LongPtr, _
    ByVal phKey As LongPtr, _
    ByVal dwLength 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

BCryptGenerateKeyPair = ctypes.windll.bcrypt.BCryptGenerateKeyPair
BCryptGenerateKeyPair.restype = ctypes.c_int
BCryptGenerateKeyPair.argtypes = [
    wintypes.HANDLE,  # hAlgorithm : BCRYPT_ALG_HANDLE in/out
    ctypes.c_void_p,  # phKey : BCRYPT_KEY_HANDLE* out
    wintypes.DWORD,  # dwLength : DWORD
    wintypes.DWORD,  # dwFlags : DWORD
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('bcrypt.dll')
BCryptGenerateKeyPair = Fiddle::Function.new(
  lib['BCryptGenerateKeyPair'],
  [
    Fiddle::TYPE_VOIDP,  # hAlgorithm : BCRYPT_ALG_HANDLE in/out
    Fiddle::TYPE_VOIDP,  # phKey : BCRYPT_KEY_HANDLE* out
    -Fiddle::TYPE_INT,  # dwLength : DWORD
    -Fiddle::TYPE_INT,  # dwFlags : DWORD
  ],
  Fiddle::TYPE_INT)

#[link(name = "bcrypt")]
extern "system" {
    fn BCryptGenerateKeyPair(
        hAlgorithm: *mut core::ffi::c_void,  // BCRYPT_ALG_HANDLE in/out
        phKey: *mut *mut core::ffi::c_void,  // BCRYPT_KEY_HANDLE* out
        dwLength: u32,  // DWORD
        dwFlags: u32  // DWORD
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("bcrypt.dll")]
public static extern int BCryptGenerateKeyPair(IntPtr hAlgorithm, IntPtr phKey, uint dwLength, uint dwFlags);
"@
$api = Add-Type -MemberDefinition $sig -Name 'bcrypt_BCryptGenerateKeyPair' -Namespace Win32 -PassThru
# $api::BCryptGenerateKeyPair(hAlgorithm, phKey, dwLength, dwFlags)

#uselib "bcrypt.dll"
#func global BCryptGenerateKeyPair "BCryptGenerateKeyPair" sptr, sptr, sptr, sptr
; BCryptGenerateKeyPair hAlgorithm, phKey, dwLength, dwFlags   ; 戻り値は stat
; hAlgorithm : BCRYPT_ALG_HANDLE in/out -> "sptr"
; phKey : BCRYPT_KEY_HANDLE* out -> "sptr"
; dwLength : DWORD -> "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 BCryptGenerateKeyPair "BCryptGenerateKeyPair" sptr, sptr, int, int
; res = BCryptGenerateKeyPair(hAlgorithm, phKey, dwLength, dwFlags)
; hAlgorithm : BCRYPT_ALG_HANDLE in/out -> "sptr"
; phKey : BCRYPT_KEY_HANDLE* out -> "sptr"
; dwLength : DWORD -> "int"
; dwFlags : DWORD -> "int"

; NTSTATUS BCryptGenerateKeyPair(BCRYPT_ALG_HANDLE hAlgorithm, BCRYPT_KEY_HANDLE* phKey, DWORD dwLength, DWORD dwFlags)
#uselib "bcrypt.dll"
#cfunc global BCryptGenerateKeyPair "BCryptGenerateKeyPair" intptr, intptr, int, int
; res = BCryptGenerateKeyPair(hAlgorithm, phKey, dwLength, dwFlags)
; hAlgorithm : BCRYPT_ALG_HANDLE in/out -> "intptr"
; phKey : BCRYPT_KEY_HANDLE* out -> "intptr"
; dwLength : DWORD -> "int"
; dwFlags : DWORD -> "int"

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

var (
	bcrypt = windows.NewLazySystemDLL("bcrypt.dll")
	procBCryptGenerateKeyPair = bcrypt.NewProc("BCryptGenerateKeyPair")
)

// hAlgorithm (BCRYPT_ALG_HANDLE in/out), phKey (BCRYPT_KEY_HANDLE* out), dwLength (DWORD), dwFlags (DWORD)
r1, _, err := procBCryptGenerateKeyPair.Call(
	uintptr(hAlgorithm),
	uintptr(phKey),
	uintptr(dwLength),
	uintptr(dwFlags),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // NTSTATUS

function BCryptGenerateKeyPair(
  hAlgorithm: THandle;   // BCRYPT_ALG_HANDLE in/out
  phKey: Pointer;   // BCRYPT_KEY_HANDLE* out
  dwLength: DWORD;   // DWORD
  dwFlags: DWORD   // DWORD
): Integer; stdcall;
  external 'bcrypt.dll' name 'BCryptGenerateKeyPair';

result := DllCall("bcrypt\BCryptGenerateKeyPair"
    , "Ptr", hAlgorithm   ; BCRYPT_ALG_HANDLE in/out
    , "Ptr", phKey   ; BCRYPT_KEY_HANDLE* out
    , "UInt", dwLength   ; DWORD
    , "UInt", dwFlags   ; DWORD
    , "Int")   ; return: NTSTATUS

●BCryptGenerateKeyPair(hAlgorithm, phKey, dwLength, dwFlags) = DLL("bcrypt.dll", "int BCryptGenerateKeyPair(void*, void*, dword, dword)")
# 呼び出し: BCryptGenerateKeyPair(hAlgorithm, phKey, dwLength, dwFlags)
# hAlgorithm : BCRYPT_ALG_HANDLE in/out -> "void*"
# phKey : BCRYPT_KEY_HANDLE* out -> "void*"
# dwLength : DWORD -> "dword"
# 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)。