SslOpenPrivateKey

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

HRESULT SslOpenPrivateKey(
    NCRYPT_PROV_HANDLE hSslProvider,
    NCRYPT_KEY_HANDLE* phPrivateKey,
    const CERT_CONTEXT* pCertContext,
    DWORD dwFlags
);

<DllImport("ncrypt.dll", ExactSpelling:=True)>
Public Shared Function SslOpenPrivateKey(
    hSslProvider As UIntPtr,   ' NCRYPT_PROV_HANDLE
    <Out> ByRef phPrivateKey As UIntPtr,   ' NCRYPT_KEY_HANDLE* out
    pCertContext As IntPtr,   ' CERT_CONTEXT*
    dwFlags As UInteger   ' DWORD
) As Integer
End Function

' hSslProvider : NCRYPT_PROV_HANDLE
' phPrivateKey : NCRYPT_KEY_HANDLE* out
' pCertContext : CERT_CONTEXT*
' dwFlags : DWORD
Declare PtrSafe Function SslOpenPrivateKey Lib "ncrypt" ( _
    ByVal hSslProvider As LongPtr, _
    ByRef phPrivateKey As LongPtr, _
    ByVal pCertContext As LongPtr, _
    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

SslOpenPrivateKey = ctypes.windll.ncrypt.SslOpenPrivateKey
SslOpenPrivateKey.restype = ctypes.c_int
SslOpenPrivateKey.argtypes = [
    ctypes.c_size_t,  # hSslProvider : NCRYPT_PROV_HANDLE
    ctypes.c_void_p,  # phPrivateKey : NCRYPT_KEY_HANDLE* out
    ctypes.c_void_p,  # pCertContext : CERT_CONTEXT*
    wintypes.DWORD,  # dwFlags : DWORD
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('ncrypt.dll')
SslOpenPrivateKey = Fiddle::Function.new(
  lib['SslOpenPrivateKey'],
  [
    Fiddle::TYPE_UINTPTR_T,  # hSslProvider : NCRYPT_PROV_HANDLE
    Fiddle::TYPE_VOIDP,  # phPrivateKey : NCRYPT_KEY_HANDLE* out
    Fiddle::TYPE_VOIDP,  # pCertContext : CERT_CONTEXT*
    -Fiddle::TYPE_INT,  # dwFlags : DWORD
  ],
  Fiddle::TYPE_INT)

#[link(name = "ncrypt")]
extern "system" {
    fn SslOpenPrivateKey(
        hSslProvider: usize,  // NCRYPT_PROV_HANDLE
        phPrivateKey: *mut usize,  // NCRYPT_KEY_HANDLE* out
        pCertContext: *const CERT_CONTEXT,  // CERT_CONTEXT*
        dwFlags: u32  // DWORD
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("ncrypt.dll")]
public static extern int SslOpenPrivateKey(UIntPtr hSslProvider, out UIntPtr phPrivateKey, IntPtr pCertContext, uint dwFlags);
"@
$api = Add-Type -MemberDefinition $sig -Name 'ncrypt_SslOpenPrivateKey' -Namespace Win32 -PassThru
# $api::SslOpenPrivateKey(hSslProvider, phPrivateKey, pCertContext, dwFlags)

#uselib "ncrypt.dll"
#func global SslOpenPrivateKey "SslOpenPrivateKey" sptr, sptr, sptr, sptr
; SslOpenPrivateKey hSslProvider, phPrivateKey, varptr(pCertContext), dwFlags   ; 戻り値は stat
; hSslProvider : NCRYPT_PROV_HANDLE -> "sptr"
; phPrivateKey : NCRYPT_KEY_HANDLE* out -> "sptr"
; pCertContext : CERT_CONTEXT* -> "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 "ncrypt.dll"
#cfunc global SslOpenPrivateKey "SslOpenPrivateKey" sptr, int, var, int
; res = SslOpenPrivateKey(hSslProvider, phPrivateKey, pCertContext, dwFlags)
; hSslProvider : NCRYPT_PROV_HANDLE -> "sptr"
; phPrivateKey : NCRYPT_KEY_HANDLE* out -> "int"
; pCertContext : CERT_CONTEXT* -> "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。

; HRESULT SslOpenPrivateKey(NCRYPT_PROV_HANDLE hSslProvider, NCRYPT_KEY_HANDLE* phPrivateKey, CERT_CONTEXT* pCertContext, DWORD dwFlags)
#uselib "ncrypt.dll"
#cfunc global SslOpenPrivateKey "SslOpenPrivateKey" intptr, int, var, int
; res = SslOpenPrivateKey(hSslProvider, phPrivateKey, pCertContext, dwFlags)
; hSslProvider : NCRYPT_PROV_HANDLE -> "intptr"
; phPrivateKey : NCRYPT_KEY_HANDLE* out -> "int"
; pCertContext : CERT_CONTEXT* -> "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 (
	ncrypt = windows.NewLazySystemDLL("ncrypt.dll")
	procSslOpenPrivateKey = ncrypt.NewProc("SslOpenPrivateKey")
)

// hSslProvider (NCRYPT_PROV_HANDLE), phPrivateKey (NCRYPT_KEY_HANDLE* out), pCertContext (CERT_CONTEXT*), dwFlags (DWORD)
r1, _, err := procSslOpenPrivateKey.Call(
	uintptr(hSslProvider),
	uintptr(phPrivateKey),
	uintptr(pCertContext),
	uintptr(dwFlags),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function SslOpenPrivateKey(
  hSslProvider: NativeUInt;   // NCRYPT_PROV_HANDLE
  phPrivateKey: Pointer;   // NCRYPT_KEY_HANDLE* out
  pCertContext: Pointer;   // CERT_CONTEXT*
  dwFlags: DWORD   // DWORD
): Integer; stdcall;
  external 'ncrypt.dll' name 'SslOpenPrivateKey';

result := DllCall("ncrypt\SslOpenPrivateKey"
    , "UPtr", hSslProvider   ; NCRYPT_PROV_HANDLE
    , "Ptr", phPrivateKey   ; NCRYPT_KEY_HANDLE* out
    , "Ptr", pCertContext   ; CERT_CONTEXT*
    , "UInt", dwFlags   ; DWORD
    , "Int")   ; return: HRESULT

●SslOpenPrivateKey(hSslProvider, phPrivateKey, pCertContext, dwFlags) = DLL("ncrypt.dll", "int SslOpenPrivateKey(int, void*, void*, dword)")
# 呼び出し: SslOpenPrivateKey(hSslProvider, phPrivateKey, pCertContext, dwFlags)
# hSslProvider : NCRYPT_PROV_HANDLE -> "int"
# phPrivateKey : NCRYPT_KEY_HANDLE* out -> "void*"
# pCertContext : CERT_CONTEXT* -> "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)。