ホーム › Security.Cryptography › CryptExportPKCS8

CryptExportPKCS8

関数

秘密鍵をPKCS#8形式のBLOBとしてエクスポートする。

DLLCRYPT32.dll呼出規約winapiSetLastErrorあり対応OSWindows XP 以降

シグネチャ

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

BOOL CryptExportPKCS8(
    UINT_PTR hCryptProv,
    DWORD dwKeySpec,
    LPSTR pszPrivateKeyObjId,
    DWORD dwFlags,
    void* pvAuxInfo,   // optional
    BYTE* pbPrivateKeyBlob,   // optional
    DWORD* pcbPrivateKeyBlob
);

パラメーター

名前	型	方向
hCryptProv	UINT_PTR	in
dwKeySpec	DWORD	in
pszPrivateKeyObjId	LPSTR	in
dwFlags	DWORD	in
pvAuxInfo	void*	inoptional
pbPrivateKeyBlob	BYTE*	outoptional
pcbPrivateKeyBlob	DWORD*	inout

戻り値の型: BOOL

各言語での呼び出し定義

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

BOOL CryptExportPKCS8(
    UINT_PTR hCryptProv,
    DWORD dwKeySpec,
    LPSTR pszPrivateKeyObjId,
    DWORD dwFlags,
    void* pvAuxInfo,   // optional
    BYTE* pbPrivateKeyBlob,   // optional
    DWORD* pcbPrivateKeyBlob
);

[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("CRYPT32.dll", SetLastError = true, ExactSpelling = true)]
static extern bool CryptExportPKCS8(
    UIntPtr hCryptProv,   // UINT_PTR
    uint dwKeySpec,   // DWORD
    [MarshalAs(UnmanagedType.LPStr)] string pszPrivateKeyObjId,   // LPSTR
    uint dwFlags,   // DWORD
    IntPtr pvAuxInfo,   // void* optional
    IntPtr pbPrivateKeyBlob,   // BYTE* optional, out
    ref uint pcbPrivateKeyBlob   // DWORD* in/out
);

<DllImport("CRYPT32.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Function CryptExportPKCS8(
    hCryptProv As UIntPtr,   ' UINT_PTR
    dwKeySpec As UInteger,   ' DWORD
    <MarshalAs(UnmanagedType.LPStr)> pszPrivateKeyObjId As String,   ' LPSTR
    dwFlags As UInteger,   ' DWORD
    pvAuxInfo As IntPtr,   ' void* optional
    pbPrivateKeyBlob As IntPtr,   ' BYTE* optional, out
    ByRef pcbPrivateKeyBlob As UInteger   ' DWORD* in/out
) As Boolean
End Function

' hCryptProv : UINT_PTR
' dwKeySpec : DWORD
' pszPrivateKeyObjId : LPSTR
' dwFlags : DWORD
' pvAuxInfo : void* optional
' pbPrivateKeyBlob : BYTE* optional, out
' pcbPrivateKeyBlob : DWORD* in/out
Declare PtrSafe Function CryptExportPKCS8 Lib "crypt32" ( _
    ByVal hCryptProv As LongPtr, _
    ByVal dwKeySpec As Long, _
    ByVal pszPrivateKeyObjId As String, _
    ByVal dwFlags As Long, _
    ByVal pvAuxInfo As LongPtr, _
    ByVal pbPrivateKeyBlob As LongPtr, _
    ByRef pcbPrivateKeyBlob 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

CryptExportPKCS8 = ctypes.windll.crypt32.CryptExportPKCS8
CryptExportPKCS8.restype = wintypes.BOOL
CryptExportPKCS8.argtypes = [
    ctypes.c_size_t,  # hCryptProv : UINT_PTR
    wintypes.DWORD,  # dwKeySpec : DWORD
    wintypes.LPCSTR,  # pszPrivateKeyObjId : LPSTR
    wintypes.DWORD,  # dwFlags : DWORD
    ctypes.POINTER(None),  # pvAuxInfo : void* optional
    ctypes.POINTER(ctypes.c_ubyte),  # pbPrivateKeyBlob : BYTE* optional, out
    ctypes.POINTER(wintypes.DWORD),  # pcbPrivateKeyBlob : DWORD* in/out
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('CRYPT32.dll')
CryptExportPKCS8 = Fiddle::Function.new(
  lib['CryptExportPKCS8'],
  [
    Fiddle::TYPE_UINTPTR_T,  # hCryptProv : UINT_PTR
    -Fiddle::TYPE_INT,  # dwKeySpec : DWORD
    Fiddle::TYPE_VOIDP,  # pszPrivateKeyObjId : LPSTR
    -Fiddle::TYPE_INT,  # dwFlags : DWORD
    Fiddle::TYPE_VOIDP,  # pvAuxInfo : void* optional
    Fiddle::TYPE_VOIDP,  # pbPrivateKeyBlob : BYTE* optional, out
    Fiddle::TYPE_VOIDP,  # pcbPrivateKeyBlob : DWORD* in/out
  ],
  Fiddle::TYPE_INT)

#[link(name = "crypt32")]
extern "system" {
    fn CryptExportPKCS8(
        hCryptProv: usize,  // UINT_PTR
        dwKeySpec: u32,  // DWORD
        pszPrivateKeyObjId: *mut u8,  // LPSTR
        dwFlags: u32,  // DWORD
        pvAuxInfo: *mut (),  // void* optional
        pbPrivateKeyBlob: *mut u8,  // BYTE* optional, out
        pcbPrivateKeyBlob: *mut u32  // DWORD* in/out
    ) -> 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 CryptExportPKCS8(UIntPtr hCryptProv, uint dwKeySpec, [MarshalAs(UnmanagedType.LPStr)] string pszPrivateKeyObjId, uint dwFlags, IntPtr pvAuxInfo, IntPtr pbPrivateKeyBlob, ref uint pcbPrivateKeyBlob);
"@
$api = Add-Type -MemberDefinition $sig -Name 'CRYPT32_CryptExportPKCS8' -Namespace Win32 -PassThru
# $api::CryptExportPKCS8(hCryptProv, dwKeySpec, pszPrivateKeyObjId, dwFlags, pvAuxInfo, pbPrivateKeyBlob, pcbPrivateKeyBlob)

#uselib "CRYPT32.dll"
#func global CryptExportPKCS8 "CryptExportPKCS8" sptr, sptr, sptr, sptr, sptr, sptr, sptr
; CryptExportPKCS8 hCryptProv, dwKeySpec, pszPrivateKeyObjId, dwFlags, pvAuxInfo, varptr(pbPrivateKeyBlob), varptr(pcbPrivateKeyBlob)   ; 戻り値は stat
; hCryptProv : UINT_PTR -> "sptr"
; dwKeySpec : DWORD -> "sptr"
; pszPrivateKeyObjId : LPSTR -> "sptr"
; dwFlags : DWORD -> "sptr"
; pvAuxInfo : void* optional -> "sptr"
; pbPrivateKeyBlob : BYTE* optional, out -> "sptr"
; pcbPrivateKeyBlob : DWORD* in/out -> "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。

出力引数:

#uselib "CRYPT32.dll"
#cfunc global CryptExportPKCS8 "CryptExportPKCS8" sptr, int, str, int, sptr, var, var
; res = CryptExportPKCS8(hCryptProv, dwKeySpec, pszPrivateKeyObjId, dwFlags, pvAuxInfo, pbPrivateKeyBlob, pcbPrivateKeyBlob)
; hCryptProv : UINT_PTR -> "sptr"
; dwKeySpec : DWORD -> "int"
; pszPrivateKeyObjId : LPSTR -> "str"
; dwFlags : DWORD -> "int"
; pvAuxInfo : void* optional -> "sptr"
; pbPrivateKeyBlob : BYTE* optional, out -> "var"
; pcbPrivateKeyBlob : DWORD* in/out -> "var"
; ※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。#uselib "CRYPT32.dll"
#cfunc global CryptExportPKCS8 "CryptExportPKCS8" sptr, int, str, int, sptr, sptr, sptr
; res = CryptExportPKCS8(hCryptProv, dwKeySpec, pszPrivateKeyObjId, dwFlags, pvAuxInfo, varptr(pbPrivateKeyBlob), varptr(pcbPrivateKeyBlob))
; hCryptProv : UINT_PTR -> "sptr"
; dwKeySpec : DWORD -> "int"
; pszPrivateKeyObjId : LPSTR -> "str"
; dwFlags : DWORD -> "int"
; pvAuxInfo : void* optional -> "sptr"
; pbPrivateKeyBlob : BYTE* optional, out -> "sptr"
; pcbPrivateKeyBlob : DWORD* in/out -> "sptr"
; ※出力/バッファ引数はポインタ方式(token=sptr / 呼び出しは varptr(変数))。

出力引数:

; BOOL CryptExportPKCS8(UINT_PTR hCryptProv, DWORD dwKeySpec, LPSTR pszPrivateKeyObjId, DWORD dwFlags, void* pvAuxInfo, BYTE* pbPrivateKeyBlob, DWORD* pcbPrivateKeyBlob)
#uselib "CRYPT32.dll"
#cfunc global CryptExportPKCS8 "CryptExportPKCS8" intptr, int, str, int, intptr, var, var
; res = CryptExportPKCS8(hCryptProv, dwKeySpec, pszPrivateKeyObjId, dwFlags, pvAuxInfo, pbPrivateKeyBlob, pcbPrivateKeyBlob)
; hCryptProv : UINT_PTR -> "intptr"
; dwKeySpec : DWORD -> "int"
; pszPrivateKeyObjId : LPSTR -> "str"
; dwFlags : DWORD -> "int"
; pvAuxInfo : void* optional -> "intptr"
; pbPrivateKeyBlob : BYTE* optional, out -> "var"
; pcbPrivateKeyBlob : DWORD* in/out -> "var"
; ※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 CryptExportPKCS8(UINT_PTR hCryptProv, DWORD dwKeySpec, LPSTR pszPrivateKeyObjId, DWORD dwFlags, void* pvAuxInfo, BYTE* pbPrivateKeyBlob, DWORD* pcbPrivateKeyBlob)
#uselib "CRYPT32.dll"
#cfunc global CryptExportPKCS8 "CryptExportPKCS8" intptr, int, str, int, intptr, intptr, intptr
; res = CryptExportPKCS8(hCryptProv, dwKeySpec, pszPrivateKeyObjId, dwFlags, pvAuxInfo, varptr(pbPrivateKeyBlob), varptr(pcbPrivateKeyBlob))
; hCryptProv : UINT_PTR -> "intptr"
; dwKeySpec : DWORD -> "int"
; pszPrivateKeyObjId : LPSTR -> "str"
; dwFlags : DWORD -> "int"
; pvAuxInfo : void* optional -> "intptr"
; pbPrivateKeyBlob : BYTE* optional, out -> "intptr"
; pcbPrivateKeyBlob : DWORD* in/out -> "intptr"
; ※出力/バッファ引数はポインタ方式(token=intptr / 呼び出しは varptr(変数))。

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

var (
	crypt32 = windows.NewLazySystemDLL("CRYPT32.dll")
	procCryptExportPKCS8 = crypt32.NewProc("CryptExportPKCS8")
)

// hCryptProv (UINT_PTR), dwKeySpec (DWORD), pszPrivateKeyObjId (LPSTR), dwFlags (DWORD), pvAuxInfo (void* optional), pbPrivateKeyBlob (BYTE* optional, out), pcbPrivateKeyBlob (DWORD* in/out)
r1, _, err := procCryptExportPKCS8.Call(
	uintptr(hCryptProv),
	uintptr(dwKeySpec),
	uintptr(unsafe.Pointer(windows.BytePtrFromString(pszPrivateKeyObjId))),
	uintptr(dwFlags),
	uintptr(pvAuxInfo),
	uintptr(pbPrivateKeyBlob),
	uintptr(pcbPrivateKeyBlob),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function CryptExportPKCS8(
  hCryptProv: NativeUInt;   // UINT_PTR
  dwKeySpec: DWORD;   // DWORD
  pszPrivateKeyObjId: PAnsiChar;   // LPSTR
  dwFlags: DWORD;   // DWORD
  pvAuxInfo: Pointer;   // void* optional
  pbPrivateKeyBlob: Pointer;   // BYTE* optional, out
  pcbPrivateKeyBlob: Pointer   // DWORD* in/out
): BOOL; stdcall;
  external 'CRYPT32.dll' name 'CryptExportPKCS8';

result := DllCall("CRYPT32\CryptExportPKCS8"
    , "UPtr", hCryptProv   ; UINT_PTR
    , "UInt", dwKeySpec   ; DWORD
    , "AStr", pszPrivateKeyObjId   ; LPSTR
    , "UInt", dwFlags   ; DWORD
    , "Ptr", pvAuxInfo   ; void* optional
    , "Ptr", pbPrivateKeyBlob   ; BYTE* optional, out
    , "Ptr", pcbPrivateKeyBlob   ; DWORD* in/out
    , "Int")   ; return: BOOL

●CryptExportPKCS8(hCryptProv, dwKeySpec, pszPrivateKeyObjId, dwFlags, pvAuxInfo, pbPrivateKeyBlob, pcbPrivateKeyBlob) = DLL("CRYPT32.dll", "bool CryptExportPKCS8(int, dword, char*, dword, void*, void*, void*)")
# 呼び出し: CryptExportPKCS8(hCryptProv, dwKeySpec, pszPrivateKeyObjId, dwFlags, pvAuxInfo, pbPrivateKeyBlob, pcbPrivateKeyBlob)
# hCryptProv : UINT_PTR -> "int"
# dwKeySpec : DWORD -> "dword"
# pszPrivateKeyObjId : LPSTR -> "char*"
# dwFlags : DWORD -> "dword"
# pvAuxInfo : void* optional -> "void*"
# pbPrivateKeyBlob : BYTE* optional, out -> "void*"
# pcbPrivateKeyBlob : DWORD* in/out -> "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)。