ホーム › Security.Cryptography › CryptUnprotectData

CryptUnprotectData

関数

CryptProtectDataで保護されたデータを復号する。

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 CryptUnprotectData(
    CRYPT_INTEGER_BLOB* pDataIn,
    LPWSTR* ppszDataDescr,   // optional
    CRYPT_INTEGER_BLOB* pOptionalEntropy,   // optional
    void* pvReserved,   // optional
    CRYPTPROTECT_PROMPTSTRUCT* pPromptStruct,   // optional
    DWORD dwFlags,
    CRYPT_INTEGER_BLOB* pDataOut
);

パラメーター

名前	型	方向
pDataIn	CRYPT_INTEGER_BLOB*	in
ppszDataDescr	LPWSTR*	outoptional
pOptionalEntropy	CRYPT_INTEGER_BLOB*	inoptional
pvReserved	void*	optional
pPromptStruct	CRYPTPROTECT_PROMPTSTRUCT*	inoptional
dwFlags	DWORD	in
pDataOut	CRYPT_INTEGER_BLOB*	out

戻り値の型: BOOL

各言語での呼び出し定義

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

BOOL CryptUnprotectData(
    CRYPT_INTEGER_BLOB* pDataIn,
    LPWSTR* ppszDataDescr,   // optional
    CRYPT_INTEGER_BLOB* pOptionalEntropy,   // optional
    void* pvReserved,   // optional
    CRYPTPROTECT_PROMPTSTRUCT* pPromptStruct,   // optional
    DWORD dwFlags,
    CRYPT_INTEGER_BLOB* pDataOut
);

[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("CRYPT32.dll", SetLastError = true, ExactSpelling = true)]
static extern bool CryptUnprotectData(
    IntPtr pDataIn,   // CRYPT_INTEGER_BLOB*
    IntPtr ppszDataDescr,   // LPWSTR* optional, out
    IntPtr pOptionalEntropy,   // CRYPT_INTEGER_BLOB* optional
    IntPtr pvReserved,   // void* optional
    IntPtr pPromptStruct,   // CRYPTPROTECT_PROMPTSTRUCT* optional
    uint dwFlags,   // DWORD
    IntPtr pDataOut   // CRYPT_INTEGER_BLOB* out
);

<DllImport("CRYPT32.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Function CryptUnprotectData(
    pDataIn As IntPtr,   ' CRYPT_INTEGER_BLOB*
    ppszDataDescr As IntPtr,   ' LPWSTR* optional, out
    pOptionalEntropy As IntPtr,   ' CRYPT_INTEGER_BLOB* optional
    pvReserved As IntPtr,   ' void* optional
    pPromptStruct As IntPtr,   ' CRYPTPROTECT_PROMPTSTRUCT* optional
    dwFlags As UInteger,   ' DWORD
    pDataOut As IntPtr   ' CRYPT_INTEGER_BLOB* out
) As Boolean
End Function

' pDataIn : CRYPT_INTEGER_BLOB*
' ppszDataDescr : LPWSTR* optional, out
' pOptionalEntropy : CRYPT_INTEGER_BLOB* optional
' pvReserved : void* optional
' pPromptStruct : CRYPTPROTECT_PROMPTSTRUCT* optional
' dwFlags : DWORD
' pDataOut : CRYPT_INTEGER_BLOB* out
Declare PtrSafe Function CryptUnprotectData Lib "crypt32" ( _
    ByVal pDataIn As LongPtr, _
    ByVal ppszDataDescr As LongPtr, _
    ByVal pOptionalEntropy As LongPtr, _
    ByVal pvReserved As LongPtr, _
    ByVal pPromptStruct As LongPtr, _
    ByVal dwFlags As Long, _
    ByVal pDataOut 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

CryptUnprotectData = ctypes.windll.crypt32.CryptUnprotectData
CryptUnprotectData.restype = wintypes.BOOL
CryptUnprotectData.argtypes = [
    ctypes.c_void_p,  # pDataIn : CRYPT_INTEGER_BLOB*
    ctypes.c_void_p,  # ppszDataDescr : LPWSTR* optional, out
    ctypes.c_void_p,  # pOptionalEntropy : CRYPT_INTEGER_BLOB* optional
    ctypes.POINTER(None),  # pvReserved : void* optional
    ctypes.c_void_p,  # pPromptStruct : CRYPTPROTECT_PROMPTSTRUCT* optional
    wintypes.DWORD,  # dwFlags : DWORD
    ctypes.c_void_p,  # pDataOut : CRYPT_INTEGER_BLOB* out
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('CRYPT32.dll')
CryptUnprotectData = Fiddle::Function.new(
  lib['CryptUnprotectData'],
  [
    Fiddle::TYPE_VOIDP,  # pDataIn : CRYPT_INTEGER_BLOB*
    Fiddle::TYPE_VOIDP,  # ppszDataDescr : LPWSTR* optional, out
    Fiddle::TYPE_VOIDP,  # pOptionalEntropy : CRYPT_INTEGER_BLOB* optional
    Fiddle::TYPE_VOIDP,  # pvReserved : void* optional
    Fiddle::TYPE_VOIDP,  # pPromptStruct : CRYPTPROTECT_PROMPTSTRUCT* optional
    -Fiddle::TYPE_INT,  # dwFlags : DWORD
    Fiddle::TYPE_VOIDP,  # pDataOut : CRYPT_INTEGER_BLOB* out
  ],
  Fiddle::TYPE_INT)

#[link(name = "crypt32")]
extern "system" {
    fn CryptUnprotectData(
        pDataIn: *mut CRYPT_INTEGER_BLOB,  // CRYPT_INTEGER_BLOB*
        ppszDataDescr: *mut *mut u16,  // LPWSTR* optional, out
        pOptionalEntropy: *mut CRYPT_INTEGER_BLOB,  // CRYPT_INTEGER_BLOB* optional
        pvReserved: *mut (),  // void* optional
        pPromptStruct: *mut CRYPTPROTECT_PROMPTSTRUCT,  // CRYPTPROTECT_PROMPTSTRUCT* optional
        dwFlags: u32,  // DWORD
        pDataOut: *mut CRYPT_INTEGER_BLOB  // CRYPT_INTEGER_BLOB* 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 CryptUnprotectData(IntPtr pDataIn, IntPtr ppszDataDescr, IntPtr pOptionalEntropy, IntPtr pvReserved, IntPtr pPromptStruct, uint dwFlags, IntPtr pDataOut);
"@
$api = Add-Type -MemberDefinition $sig -Name 'CRYPT32_CryptUnprotectData' -Namespace Win32 -PassThru
# $api::CryptUnprotectData(pDataIn, ppszDataDescr, pOptionalEntropy, pvReserved, pPromptStruct, dwFlags, pDataOut)

#uselib "CRYPT32.dll"
#func global CryptUnprotectData "CryptUnprotectData" sptr, sptr, sptr, sptr, sptr, sptr, sptr
; CryptUnprotectData varptr(pDataIn), varptr(ppszDataDescr), varptr(pOptionalEntropy), pvReserved, varptr(pPromptStruct), dwFlags, varptr(pDataOut)   ; 戻り値は stat
; pDataIn : CRYPT_INTEGER_BLOB* -> "sptr"
; ppszDataDescr : LPWSTR* optional, out -> "sptr"
; pOptionalEntropy : CRYPT_INTEGER_BLOB* optional -> "sptr"
; pvReserved : void* optional -> "sptr"
; pPromptStruct : CRYPTPROTECT_PROMPTSTRUCT* optional -> "sptr"
; dwFlags : DWORD -> "sptr"
; pDataOut : CRYPT_INTEGER_BLOB* 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 CryptUnprotectData "CryptUnprotectData" var, var, var, sptr, var, int, var
; res = CryptUnprotectData(pDataIn, ppszDataDescr, pOptionalEntropy, pvReserved, pPromptStruct, dwFlags, pDataOut)
; pDataIn : CRYPT_INTEGER_BLOB* -> "var"
; ppszDataDescr : LPWSTR* optional, out -> "var"
; pOptionalEntropy : CRYPT_INTEGER_BLOB* optional -> "var"
; pvReserved : void* optional -> "sptr"
; pPromptStruct : CRYPTPROTECT_PROMPTSTRUCT* optional -> "var"
; dwFlags : DWORD -> "int"
; pDataOut : CRYPT_INTEGER_BLOB* 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 CryptUnprotectData "CryptUnprotectData" sptr, sptr, sptr, sptr, sptr, int, sptr
; res = CryptUnprotectData(varptr(pDataIn), varptr(ppszDataDescr), varptr(pOptionalEntropy), pvReserved, varptr(pPromptStruct), dwFlags, varptr(pDataOut))
; pDataIn : CRYPT_INTEGER_BLOB* -> "sptr"
; ppszDataDescr : LPWSTR* optional, out -> "sptr"
; pOptionalEntropy : CRYPT_INTEGER_BLOB* optional -> "sptr"
; pvReserved : void* optional -> "sptr"
; pPromptStruct : CRYPTPROTECT_PROMPTSTRUCT* optional -> "sptr"
; dwFlags : DWORD -> "int"
; pDataOut : CRYPT_INTEGER_BLOB* 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 CryptUnprotectData(CRYPT_INTEGER_BLOB* pDataIn, LPWSTR* ppszDataDescr, CRYPT_INTEGER_BLOB* pOptionalEntropy, void* pvReserved, CRYPTPROTECT_PROMPTSTRUCT* pPromptStruct, DWORD dwFlags, CRYPT_INTEGER_BLOB* pDataOut)
#uselib "CRYPT32.dll"
#cfunc global CryptUnprotectData "CryptUnprotectData" var, var, var, intptr, var, int, var
; res = CryptUnprotectData(pDataIn, ppszDataDescr, pOptionalEntropy, pvReserved, pPromptStruct, dwFlags, pDataOut)
; pDataIn : CRYPT_INTEGER_BLOB* -> "var"
; ppszDataDescr : LPWSTR* optional, out -> "var"
; pOptionalEntropy : CRYPT_INTEGER_BLOB* optional -> "var"
; pvReserved : void* optional -> "intptr"
; pPromptStruct : CRYPTPROTECT_PROMPTSTRUCT* optional -> "var"
; dwFlags : DWORD -> "int"
; pDataOut : CRYPT_INTEGER_BLOB* 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 CryptUnprotectData(CRYPT_INTEGER_BLOB* pDataIn, LPWSTR* ppszDataDescr, CRYPT_INTEGER_BLOB* pOptionalEntropy, void* pvReserved, CRYPTPROTECT_PROMPTSTRUCT* pPromptStruct, DWORD dwFlags, CRYPT_INTEGER_BLOB* pDataOut)
#uselib "CRYPT32.dll"
#cfunc global CryptUnprotectData "CryptUnprotectData" intptr, intptr, intptr, intptr, intptr, int, intptr
; res = CryptUnprotectData(varptr(pDataIn), varptr(ppszDataDescr), varptr(pOptionalEntropy), pvReserved, varptr(pPromptStruct), dwFlags, varptr(pDataOut))
; pDataIn : CRYPT_INTEGER_BLOB* -> "intptr"
; ppszDataDescr : LPWSTR* optional, out -> "intptr"
; pOptionalEntropy : CRYPT_INTEGER_BLOB* optional -> "intptr"
; pvReserved : void* optional -> "intptr"
; pPromptStruct : CRYPTPROTECT_PROMPTSTRUCT* optional -> "intptr"
; dwFlags : DWORD -> "int"
; pDataOut : CRYPT_INTEGER_BLOB* 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")
	procCryptUnprotectData = crypt32.NewProc("CryptUnprotectData")
)

// pDataIn (CRYPT_INTEGER_BLOB*), ppszDataDescr (LPWSTR* optional, out), pOptionalEntropy (CRYPT_INTEGER_BLOB* optional), pvReserved (void* optional), pPromptStruct (CRYPTPROTECT_PROMPTSTRUCT* optional), dwFlags (DWORD), pDataOut (CRYPT_INTEGER_BLOB* out)
r1, _, err := procCryptUnprotectData.Call(
	uintptr(pDataIn),
	uintptr(ppszDataDescr),
	uintptr(pOptionalEntropy),
	uintptr(pvReserved),
	uintptr(pPromptStruct),
	uintptr(dwFlags),
	uintptr(pDataOut),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function CryptUnprotectData(
  pDataIn: Pointer;   // CRYPT_INTEGER_BLOB*
  ppszDataDescr: PPWideChar;   // LPWSTR* optional, out
  pOptionalEntropy: Pointer;   // CRYPT_INTEGER_BLOB* optional
  pvReserved: Pointer;   // void* optional
  pPromptStruct: Pointer;   // CRYPTPROTECT_PROMPTSTRUCT* optional
  dwFlags: DWORD;   // DWORD
  pDataOut: Pointer   // CRYPT_INTEGER_BLOB* out
): BOOL; stdcall;
  external 'CRYPT32.dll' name 'CryptUnprotectData';

result := DllCall("CRYPT32\CryptUnprotectData"
    , "Ptr", pDataIn   ; CRYPT_INTEGER_BLOB*
    , "Ptr", ppszDataDescr   ; LPWSTR* optional, out
    , "Ptr", pOptionalEntropy   ; CRYPT_INTEGER_BLOB* optional
    , "Ptr", pvReserved   ; void* optional
    , "Ptr", pPromptStruct   ; CRYPTPROTECT_PROMPTSTRUCT* optional
    , "UInt", dwFlags   ; DWORD
    , "Ptr", pDataOut   ; CRYPT_INTEGER_BLOB* out
    , "Int")   ; return: BOOL

●CryptUnprotectData(pDataIn, ppszDataDescr, pOptionalEntropy, pvReserved, pPromptStruct, dwFlags, pDataOut) = DLL("CRYPT32.dll", "bool CryptUnprotectData(void*, void*, void*, void*, void*, dword, void*)")
# 呼び出し: CryptUnprotectData(pDataIn, ppszDataDescr, pOptionalEntropy, pvReserved, pPromptStruct, dwFlags, pDataOut)
# pDataIn : CRYPT_INTEGER_BLOB* -> "void*"
# ppszDataDescr : LPWSTR* optional, out -> "void*"
# pOptionalEntropy : CRYPT_INTEGER_BLOB* optional -> "void*"
# pvReserved : void* optional -> "void*"
# pPromptStruct : CRYPTPROTECT_PROMPTSTRUCT* optional -> "void*"
# dwFlags : DWORD -> "dword"
# pDataOut : CRYPT_INTEGER_BLOB* 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)。