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NCryptDecrypt

関数

指定したキーを使って暗号文を復号する。

DLLncrypt.dll呼出規約winapi対応OSWindows Vista 以降

シグネチャ

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

HRESULT NCryptDecrypt(
    NCRYPT_KEY_HANDLE hKey,
    BYTE* pbInput,   // optional
    DWORD cbInput,
    void* pPaddingInfo,   // optional
    BYTE* pbOutput,   // optional
    DWORD cbOutput,
    DWORD* pcbResult,
    NCRYPT_FLAGS dwFlags
);

パラメーター

名前	型	方向
hKey	NCRYPT_KEY_HANDLE	in
pbInput	BYTE*	inoptional
cbInput	DWORD	in
pPaddingInfo	void*	inoptional
pbOutput	BYTE*	outoptional
cbOutput	DWORD	in
pcbResult	DWORD*	out
dwFlags	NCRYPT_FLAGS	in

戻り値の型: HRESULT

各言語での呼び出し定義

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

HRESULT NCryptDecrypt(
    NCRYPT_KEY_HANDLE hKey,
    BYTE* pbInput,   // optional
    DWORD cbInput,
    void* pPaddingInfo,   // optional
    BYTE* pbOutput,   // optional
    DWORD cbOutput,
    DWORD* pcbResult,
    NCRYPT_FLAGS dwFlags
);

[DllImport("ncrypt.dll", ExactSpelling = true)]
static extern int NCryptDecrypt(
    UIntPtr hKey,   // NCRYPT_KEY_HANDLE
    IntPtr pbInput,   // BYTE* optional
    uint cbInput,   // DWORD
    IntPtr pPaddingInfo,   // void* optional
    IntPtr pbOutput,   // BYTE* optional, out
    uint cbOutput,   // DWORD
    out uint pcbResult,   // DWORD* out
    uint dwFlags   // NCRYPT_FLAGS
);

<DllImport("ncrypt.dll", ExactSpelling:=True)>
Public Shared Function NCryptDecrypt(
    hKey As UIntPtr,   ' NCRYPT_KEY_HANDLE
    pbInput As IntPtr,   ' BYTE* optional
    cbInput As UInteger,   ' DWORD
    pPaddingInfo As IntPtr,   ' void* optional
    pbOutput As IntPtr,   ' BYTE* optional, out
    cbOutput As UInteger,   ' DWORD
    <Out> ByRef pcbResult As UInteger,   ' DWORD* out
    dwFlags As UInteger   ' NCRYPT_FLAGS
) As Integer
End Function

' hKey : NCRYPT_KEY_HANDLE
' pbInput : BYTE* optional
' cbInput : DWORD
' pPaddingInfo : void* optional
' pbOutput : BYTE* optional, out
' cbOutput : DWORD
' pcbResult : DWORD* out
' dwFlags : NCRYPT_FLAGS
Declare PtrSafe Function NCryptDecrypt Lib "ncrypt" ( _
    ByVal hKey As LongPtr, _
    ByVal pbInput As LongPtr, _
    ByVal cbInput As Long, _
    ByVal pPaddingInfo 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

NCryptDecrypt = ctypes.windll.ncrypt.NCryptDecrypt
NCryptDecrypt.restype = ctypes.c_int
NCryptDecrypt.argtypes = [
    ctypes.c_size_t,  # hKey : NCRYPT_KEY_HANDLE
    ctypes.POINTER(ctypes.c_ubyte),  # pbInput : BYTE* optional
    wintypes.DWORD,  # cbInput : DWORD
    ctypes.POINTER(None),  # pPaddingInfo : void* optional
    ctypes.POINTER(ctypes.c_ubyte),  # pbOutput : BYTE* optional, out
    wintypes.DWORD,  # cbOutput : DWORD
    ctypes.POINTER(wintypes.DWORD),  # pcbResult : DWORD* out
    wintypes.DWORD,  # dwFlags : NCRYPT_FLAGS
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('ncrypt.dll')
NCryptDecrypt = Fiddle::Function.new(
  lib['NCryptDecrypt'],
  [
    Fiddle::TYPE_UINTPTR_T,  # hKey : NCRYPT_KEY_HANDLE
    Fiddle::TYPE_VOIDP,  # pbInput : BYTE* optional
    -Fiddle::TYPE_INT,  # cbInput : DWORD
    Fiddle::TYPE_VOIDP,  # pPaddingInfo : void* optional
    Fiddle::TYPE_VOIDP,  # pbOutput : BYTE* optional, out
    -Fiddle::TYPE_INT,  # cbOutput : DWORD
    Fiddle::TYPE_VOIDP,  # pcbResult : DWORD* out
    -Fiddle::TYPE_INT,  # dwFlags : NCRYPT_FLAGS
  ],
  Fiddle::TYPE_INT)

#[link(name = "ncrypt")]
extern "system" {
    fn NCryptDecrypt(
        hKey: usize,  // NCRYPT_KEY_HANDLE
        pbInput: *mut u8,  // BYTE* optional
        cbInput: u32,  // DWORD
        pPaddingInfo: *mut (),  // void* optional
        pbOutput: *mut u8,  // BYTE* optional, out
        cbOutput: u32,  // DWORD
        pcbResult: *mut u32,  // DWORD* out
        dwFlags: u32  // NCRYPT_FLAGS
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("ncrypt.dll")]
public static extern int NCryptDecrypt(UIntPtr hKey, IntPtr pbInput, uint cbInput, IntPtr pPaddingInfo, IntPtr pbOutput, uint cbOutput, out uint pcbResult, uint dwFlags);
"@
$api = Add-Type -MemberDefinition $sig -Name 'ncrypt_NCryptDecrypt' -Namespace Win32 -PassThru
# $api::NCryptDecrypt(hKey, pbInput, cbInput, pPaddingInfo, pbOutput, cbOutput, pcbResult, dwFlags)

#uselib "ncrypt.dll"
#func global NCryptDecrypt "NCryptDecrypt" sptr, sptr, sptr, sptr, sptr, sptr, sptr, sptr
; NCryptDecrypt hKey, varptr(pbInput), cbInput, pPaddingInfo, varptr(pbOutput), cbOutput, varptr(pcbResult), dwFlags   ; 戻り値は stat
; hKey : NCRYPT_KEY_HANDLE -> "sptr"
; pbInput : BYTE* optional -> "sptr"
; cbInput : DWORD -> "sptr"
; pPaddingInfo : void* optional -> "sptr"
; pbOutput : BYTE* optional, out -> "sptr"
; cbOutput : DWORD -> "sptr"
; pcbResult : DWORD* out -> "sptr"
; dwFlags : NCRYPT_FLAGS -> "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 "ncrypt.dll"
#cfunc global NCryptDecrypt "NCryptDecrypt" sptr, var, int, sptr, var, int, var, int
; res = NCryptDecrypt(hKey, pbInput, cbInput, pPaddingInfo, pbOutput, cbOutput, pcbResult, dwFlags)
; hKey : NCRYPT_KEY_HANDLE -> "sptr"
; pbInput : BYTE* optional -> "var"
; cbInput : DWORD -> "int"
; pPaddingInfo : void* optional -> "sptr"
; pbOutput : BYTE* optional, out -> "var"
; cbOutput : DWORD -> "int"
; pcbResult : DWORD* out -> "var"
; dwFlags : NCRYPT_FLAGS -> "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。#uselib "ncrypt.dll"
#cfunc global NCryptDecrypt "NCryptDecrypt" sptr, sptr, int, sptr, sptr, int, sptr, int
; res = NCryptDecrypt(hKey, varptr(pbInput), cbInput, pPaddingInfo, varptr(pbOutput), cbOutput, varptr(pcbResult), dwFlags)
; hKey : NCRYPT_KEY_HANDLE -> "sptr"
; pbInput : BYTE* optional -> "sptr"
; cbInput : DWORD -> "int"
; pPaddingInfo : void* optional -> "sptr"
; pbOutput : BYTE* optional, out -> "sptr"
; cbOutput : DWORD -> "int"
; pcbResult : DWORD* out -> "sptr"
; dwFlags : NCRYPT_FLAGS -> "int"
; ※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:

; HRESULT NCryptDecrypt(NCRYPT_KEY_HANDLE hKey, BYTE* pbInput, DWORD cbInput, void* pPaddingInfo, BYTE* pbOutput, DWORD cbOutput, DWORD* pcbResult, NCRYPT_FLAGS dwFlags)
#uselib "ncrypt.dll"
#cfunc global NCryptDecrypt "NCryptDecrypt" intptr, var, int, intptr, var, int, var, int
; res = NCryptDecrypt(hKey, pbInput, cbInput, pPaddingInfo, pbOutput, cbOutput, pcbResult, dwFlags)
; hKey : NCRYPT_KEY_HANDLE -> "intptr"
; pbInput : BYTE* optional -> "var"
; cbInput : DWORD -> "int"
; pPaddingInfo : void* optional -> "intptr"
; pbOutput : BYTE* optional, out -> "var"
; cbOutput : DWORD -> "int"
; pcbResult : DWORD* out -> "var"
; dwFlags : NCRYPT_FLAGS -> "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 NCryptDecrypt(NCRYPT_KEY_HANDLE hKey, BYTE* pbInput, DWORD cbInput, void* pPaddingInfo, BYTE* pbOutput, DWORD cbOutput, DWORD* pcbResult, NCRYPT_FLAGS dwFlags)
#uselib "ncrypt.dll"
#cfunc global NCryptDecrypt "NCryptDecrypt" intptr, intptr, int, intptr, intptr, int, intptr, int
; res = NCryptDecrypt(hKey, varptr(pbInput), cbInput, pPaddingInfo, varptr(pbOutput), cbOutput, varptr(pcbResult), dwFlags)
; hKey : NCRYPT_KEY_HANDLE -> "intptr"
; pbInput : BYTE* optional -> "intptr"
; cbInput : DWORD -> "int"
; pPaddingInfo : void* optional -> "intptr"
; pbOutput : BYTE* optional, out -> "intptr"
; cbOutput : DWORD -> "int"
; pcbResult : DWORD* out -> "intptr"
; dwFlags : NCRYPT_FLAGS -> "int"
; ※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 (
	ncrypt = windows.NewLazySystemDLL("ncrypt.dll")
	procNCryptDecrypt = ncrypt.NewProc("NCryptDecrypt")
)

// hKey (NCRYPT_KEY_HANDLE), pbInput (BYTE* optional), cbInput (DWORD), pPaddingInfo (void* optional), pbOutput (BYTE* optional, out), cbOutput (DWORD), pcbResult (DWORD* out), dwFlags (NCRYPT_FLAGS)
r1, _, err := procNCryptDecrypt.Call(
	uintptr(hKey),
	uintptr(pbInput),
	uintptr(cbInput),
	uintptr(pPaddingInfo),
	uintptr(pbOutput),
	uintptr(cbOutput),
	uintptr(pcbResult),
	uintptr(dwFlags),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function NCryptDecrypt(
  hKey: NativeUInt;   // NCRYPT_KEY_HANDLE
  pbInput: Pointer;   // BYTE* optional
  cbInput: DWORD;   // DWORD
  pPaddingInfo: Pointer;   // void* optional
  pbOutput: Pointer;   // BYTE* optional, out
  cbOutput: DWORD;   // DWORD
  pcbResult: Pointer;   // DWORD* out
  dwFlags: DWORD   // NCRYPT_FLAGS
): Integer; stdcall;
  external 'ncrypt.dll' name 'NCryptDecrypt';

result := DllCall("ncrypt\NCryptDecrypt"
    , "UPtr", hKey   ; NCRYPT_KEY_HANDLE
    , "Ptr", pbInput   ; BYTE* optional
    , "UInt", cbInput   ; DWORD
    , "Ptr", pPaddingInfo   ; void* optional
    , "Ptr", pbOutput   ; BYTE* optional, out
    , "UInt", cbOutput   ; DWORD
    , "Ptr", pcbResult   ; DWORD* out
    , "UInt", dwFlags   ; NCRYPT_FLAGS
    , "Int")   ; return: HRESULT

●NCryptDecrypt(hKey, pbInput, cbInput, pPaddingInfo, pbOutput, cbOutput, pcbResult, dwFlags) = DLL("ncrypt.dll", "int NCryptDecrypt(int, void*, dword, void*, void*, dword, void*, dword)")
# 呼び出し: NCryptDecrypt(hKey, pbInput, cbInput, pPaddingInfo, pbOutput, cbOutput, pcbResult, dwFlags)
# hKey : NCRYPT_KEY_HANDLE -> "int"
# pbInput : BYTE* optional -> "void*"
# cbInput : DWORD -> "dword"
# pPaddingInfo : void* optional -> "void*"
# pbOutput : BYTE* optional, out -> "void*"
# cbOutput : DWORD -> "dword"
# pcbResult : DWORD* out -> "void*"
# dwFlags : NCRYPT_FLAGS -> "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)。