CryptImportPKCS8

// CRYPT32.dll
#include <windows.h>

BOOL CryptImportPKCS8(
    CRYPT_PKCS8_IMPORT_PARAMS sPrivateKeyAndParams,
    CRYPT_KEY_FLAGS dwFlags,
    UINT_PTR* phCryptProv,   // optional
    void* pvAuxInfo   // optional
);

<DllImport("CRYPT32.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Function CryptImportPKCS8(
    sPrivateKeyAndParams As CRYPT_PKCS8_IMPORT_PARAMS,   ' CRYPT_PKCS8_IMPORT_PARAMS
    dwFlags As UInteger,   ' CRYPT_KEY_FLAGS
    phCryptProv As IntPtr,   ' UINT_PTR* optional, out
    pvAuxInfo As IntPtr   ' void* optional
) As Boolean
End Function

' sPrivateKeyAndParams : CRYPT_PKCS8_IMPORT_PARAMS
' dwFlags : CRYPT_KEY_FLAGS
' phCryptProv : UINT_PTR* optional, out
' pvAuxInfo : void* optional
Declare PtrSafe Function CryptImportPKCS8 Lib "crypt32" ( _
    ByVal sPrivateKeyAndParams As LongPtr, _
    ByVal dwFlags As Long, _
    ByVal phCryptProv As LongPtr, _
    ByVal pvAuxInfo As LongPtr) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

CryptImportPKCS8 = ctypes.windll.crypt32.CryptImportPKCS8
CryptImportPKCS8.restype = wintypes.BOOL
CryptImportPKCS8.argtypes = [
    CRYPT_PKCS8_IMPORT_PARAMS,  # sPrivateKeyAndParams : CRYPT_PKCS8_IMPORT_PARAMS
    wintypes.DWORD,  # dwFlags : CRYPT_KEY_FLAGS
    ctypes.POINTER(ctypes.c_size_t),  # phCryptProv : UINT_PTR* optional, out
    ctypes.POINTER(None),  # pvAuxInfo : void* optional
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('CRYPT32.dll')
CryptImportPKCS8 = Fiddle::Function.new(
  lib['CryptImportPKCS8'],
  [
    Fiddle::TYPE_VOIDP,  # sPrivateKeyAndParams : CRYPT_PKCS8_IMPORT_PARAMS
    -Fiddle::TYPE_INT,  # dwFlags : CRYPT_KEY_FLAGS
    Fiddle::TYPE_VOIDP,  # phCryptProv : UINT_PTR* optional, out
    Fiddle::TYPE_VOIDP,  # pvAuxInfo : void* optional
  ],
  Fiddle::TYPE_INT)

#[link(name = "crypt32")]
extern "system" {
    fn CryptImportPKCS8(
        sPrivateKeyAndParams: CRYPT_PKCS8_IMPORT_PARAMS,  // CRYPT_PKCS8_IMPORT_PARAMS
        dwFlags: u32,  // CRYPT_KEY_FLAGS
        phCryptProv: *mut usize,  // UINT_PTR* optional, out
        pvAuxInfo: *mut ()  // void* optional
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("CRYPT32.dll", SetLastError = true)]
public static extern bool CryptImportPKCS8(CRYPT_PKCS8_IMPORT_PARAMS sPrivateKeyAndParams, uint dwFlags, IntPtr phCryptProv, IntPtr pvAuxInfo);
"@
$api = Add-Type -MemberDefinition $sig -Name 'CRYPT32_CryptImportPKCS8' -Namespace Win32 -PassThru
# $api::CryptImportPKCS8(sPrivateKeyAndParams, dwFlags, phCryptProv, pvAuxInfo)

#uselib "CRYPT32.dll"
#func global CryptImportPKCS8 "CryptImportPKCS8" sptr, sptr, sptr, sptr
; CryptImportPKCS8 sPrivateKeyAndParams, dwFlags, varptr(phCryptProv), pvAuxInfo   ; 戻り値は stat
; sPrivateKeyAndParams : CRYPT_PKCS8_IMPORT_PARAMS -> "sptr"
; dwFlags : CRYPT_KEY_FLAGS -> "sptr"
; phCryptProv : UINT_PTR* optional, out -> "sptr"
; pvAuxInfo : void* optional -> "sptr"
; ※値渡し構造体は直接渡せません。intにパック、または var で構造体変数を渡してください。
; ※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 "CRYPT32.dll"
#cfunc global CryptImportPKCS8 "CryptImportPKCS8" int, int, var, sptr
; res = CryptImportPKCS8(sPrivateKeyAndParams, dwFlags, phCryptProv, pvAuxInfo)
; sPrivateKeyAndParams : CRYPT_PKCS8_IMPORT_PARAMS -> "int"
; dwFlags : CRYPT_KEY_FLAGS -> "int"
; phCryptProv : UINT_PTR* optional, out -> "var"
; pvAuxInfo : void* optional -> "sptr"
; ※値渡し構造体は直接渡せません。intにパック、または var で構造体変数を渡してください。
; ※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。

; BOOL CryptImportPKCS8(CRYPT_PKCS8_IMPORT_PARAMS sPrivateKeyAndParams, CRYPT_KEY_FLAGS dwFlags, UINT_PTR* phCryptProv, void* pvAuxInfo)
#uselib "CRYPT32.dll"
#cfunc global CryptImportPKCS8 "CryptImportPKCS8" int, int, var, intptr
; res = CryptImportPKCS8(sPrivateKeyAndParams, dwFlags, phCryptProv, pvAuxInfo)
; sPrivateKeyAndParams : CRYPT_PKCS8_IMPORT_PARAMS -> "int"
; dwFlags : CRYPT_KEY_FLAGS -> "int"
; phCryptProv : UINT_PTR* optional, out -> "var"
; pvAuxInfo : void* optional -> "intptr"
; ※値渡し構造体は直接渡せません。intにパック、または var で構造体変数を渡してください。
; ※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 (
	crypt32 = windows.NewLazySystemDLL("CRYPT32.dll")
	procCryptImportPKCS8 = crypt32.NewProc("CryptImportPKCS8")
)

// sPrivateKeyAndParams (CRYPT_PKCS8_IMPORT_PARAMS), dwFlags (CRYPT_KEY_FLAGS), phCryptProv (UINT_PTR* optional, out), pvAuxInfo (void* optional)
r1, _, err := procCryptImportPKCS8.Call(
	uintptr(sPrivateKeyAndParams),
	uintptr(dwFlags),
	uintptr(phCryptProv),
	uintptr(pvAuxInfo),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function CryptImportPKCS8(
  sPrivateKeyAndParams: CRYPT_PKCS8_IMPORT_PARAMS;   // CRYPT_PKCS8_IMPORT_PARAMS
  dwFlags: DWORD;   // CRYPT_KEY_FLAGS
  phCryptProv: Pointer;   // UINT_PTR* optional, out
  pvAuxInfo: Pointer   // void* optional
): BOOL; stdcall;
  external 'CRYPT32.dll' name 'CryptImportPKCS8';

result := DllCall("CRYPT32\CryptImportPKCS8"
    , "Ptr", sPrivateKeyAndParams   ; CRYPT_PKCS8_IMPORT_PARAMS
    , "UInt", dwFlags   ; CRYPT_KEY_FLAGS
    , "Ptr", phCryptProv   ; UINT_PTR* optional, out
    , "Ptr", pvAuxInfo   ; void* optional
    , "Int")   ; return: BOOL

●CryptImportPKCS8(sPrivateKeyAndParams, dwFlags, phCryptProv, pvAuxInfo) = DLL("CRYPT32.dll", "bool CryptImportPKCS8(void*, dword, void*, void*)")
# 呼び出し: CryptImportPKCS8(sPrivateKeyAndParams, dwFlags, phCryptProv, pvAuxInfo)
# sPrivateKeyAndParams : CRYPT_PKCS8_IMPORT_PARAMS -> "void*"
# dwFlags : CRYPT_KEY_FLAGS -> "dword"
# phCryptProv : UINT_PTR* optional, out -> "void*"
# pvAuxInfo : void* optional -> "void*"
# 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)。