DRMDecrypt

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

HRESULT DRMDecrypt(
    DWORD hCryptoProvider,
    DWORD iPosition,
    DWORD cNumInBytes,
    BYTE* pbInData,
    DWORD* pcNumOutBytes,
    BYTE* pbOutData
);

<DllImport("msdrm.dll", ExactSpelling:=True)>
Public Shared Function DRMDecrypt(
    hCryptoProvider As UInteger,   ' DWORD
    iPosition As UInteger,   ' DWORD
    cNumInBytes As UInteger,   ' DWORD
    pbInData As IntPtr,   ' BYTE* in/out
    ByRef pcNumOutBytes As UInteger,   ' DWORD* in/out
    pbOutData As IntPtr   ' BYTE* in/out
) As Integer
End Function

' hCryptoProvider : DWORD
' iPosition : DWORD
' cNumInBytes : DWORD
' pbInData : BYTE* in/out
' pcNumOutBytes : DWORD* in/out
' pbOutData : BYTE* in/out
Declare PtrSafe Function DRMDecrypt Lib "msdrm" ( _
    ByVal hCryptoProvider As Long, _
    ByVal iPosition As Long, _
    ByVal cNumInBytes As Long, _
    ByVal pbInData As LongPtr, _
    ByRef pcNumOutBytes As Long, _
    ByVal pbOutData 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

DRMDecrypt = ctypes.windll.msdrm.DRMDecrypt
DRMDecrypt.restype = ctypes.c_int
DRMDecrypt.argtypes = [
    wintypes.DWORD,  # hCryptoProvider : DWORD
    wintypes.DWORD,  # iPosition : DWORD
    wintypes.DWORD,  # cNumInBytes : DWORD
    ctypes.POINTER(ctypes.c_ubyte),  # pbInData : BYTE* in/out
    ctypes.POINTER(wintypes.DWORD),  # pcNumOutBytes : DWORD* in/out
    ctypes.POINTER(ctypes.c_ubyte),  # pbOutData : BYTE* in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('msdrm.dll')
DRMDecrypt = Fiddle::Function.new(
  lib['DRMDecrypt'],
  [
    -Fiddle::TYPE_INT,  # hCryptoProvider : DWORD
    -Fiddle::TYPE_INT,  # iPosition : DWORD
    -Fiddle::TYPE_INT,  # cNumInBytes : DWORD
    Fiddle::TYPE_VOIDP,  # pbInData : BYTE* in/out
    Fiddle::TYPE_VOIDP,  # pcNumOutBytes : DWORD* in/out
    Fiddle::TYPE_VOIDP,  # pbOutData : BYTE* in/out
  ],
  Fiddle::TYPE_INT)

#[link(name = "msdrm")]
extern "system" {
    fn DRMDecrypt(
        hCryptoProvider: u32,  // DWORD
        iPosition: u32,  // DWORD
        cNumInBytes: u32,  // DWORD
        pbInData: *mut u8,  // BYTE* in/out
        pcNumOutBytes: *mut u32,  // DWORD* in/out
        pbOutData: *mut u8  // BYTE* in/out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("msdrm.dll")]
public static extern int DRMDecrypt(uint hCryptoProvider, uint iPosition, uint cNumInBytes, IntPtr pbInData, ref uint pcNumOutBytes, IntPtr pbOutData);
"@
$api = Add-Type -MemberDefinition $sig -Name 'msdrm_DRMDecrypt' -Namespace Win32 -PassThru
# $api::DRMDecrypt(hCryptoProvider, iPosition, cNumInBytes, pbInData, pcNumOutBytes, pbOutData)

#uselib "msdrm.dll"
#func global DRMDecrypt "DRMDecrypt" sptr, sptr, sptr, sptr, sptr, sptr
; DRMDecrypt hCryptoProvider, iPosition, cNumInBytes, varptr(pbInData), varptr(pcNumOutBytes), varptr(pbOutData)   ; 戻り値は stat
; hCryptoProvider : DWORD -> "sptr"
; iPosition : DWORD -> "sptr"
; cNumInBytes : DWORD -> "sptr"
; pbInData : BYTE* in/out -> "sptr"
; pcNumOutBytes : DWORD* in/out -> "sptr"
; pbOutData : BYTE* 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。

#uselib "msdrm.dll"
#cfunc global DRMDecrypt "DRMDecrypt" int, int, int, var, var, var
; res = DRMDecrypt(hCryptoProvider, iPosition, cNumInBytes, pbInData, pcNumOutBytes, pbOutData)
; hCryptoProvider : DWORD -> "int"
; iPosition : DWORD -> "int"
; cNumInBytes : DWORD -> "int"
; pbInData : BYTE* in/out -> "var"
; pcNumOutBytes : DWORD* in/out -> "var"
; pbOutData : BYTE* 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。

; HRESULT DRMDecrypt(DWORD hCryptoProvider, DWORD iPosition, DWORD cNumInBytes, BYTE* pbInData, DWORD* pcNumOutBytes, BYTE* pbOutData)
#uselib "msdrm.dll"
#cfunc global DRMDecrypt "DRMDecrypt" int, int, int, var, var, var
; res = DRMDecrypt(hCryptoProvider, iPosition, cNumInBytes, pbInData, pcNumOutBytes, pbOutData)
; hCryptoProvider : DWORD -> "int"
; iPosition : DWORD -> "int"
; cNumInBytes : DWORD -> "int"
; pbInData : BYTE* in/out -> "var"
; pcNumOutBytes : DWORD* in/out -> "var"
; pbOutData : BYTE* 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。

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

var (
	msdrm = windows.NewLazySystemDLL("msdrm.dll")
	procDRMDecrypt = msdrm.NewProc("DRMDecrypt")
)

// hCryptoProvider (DWORD), iPosition (DWORD), cNumInBytes (DWORD), pbInData (BYTE* in/out), pcNumOutBytes (DWORD* in/out), pbOutData (BYTE* in/out)
r1, _, err := procDRMDecrypt.Call(
	uintptr(hCryptoProvider),
	uintptr(iPosition),
	uintptr(cNumInBytes),
	uintptr(pbInData),
	uintptr(pcNumOutBytes),
	uintptr(pbOutData),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function DRMDecrypt(
  hCryptoProvider: DWORD;   // DWORD
  iPosition: DWORD;   // DWORD
  cNumInBytes: DWORD;   // DWORD
  pbInData: Pointer;   // BYTE* in/out
  pcNumOutBytes: Pointer;   // DWORD* in/out
  pbOutData: Pointer   // BYTE* in/out
): Integer; stdcall;
  external 'msdrm.dll' name 'DRMDecrypt';

result := DllCall("msdrm\DRMDecrypt"
    , "UInt", hCryptoProvider   ; DWORD
    , "UInt", iPosition   ; DWORD
    , "UInt", cNumInBytes   ; DWORD
    , "Ptr", pbInData   ; BYTE* in/out
    , "Ptr", pcNumOutBytes   ; DWORD* in/out
    , "Ptr", pbOutData   ; BYTE* in/out
    , "Int")   ; return: HRESULT

●DRMDecrypt(hCryptoProvider, iPosition, cNumInBytes, pbInData, pcNumOutBytes, pbOutData) = DLL("msdrm.dll", "int DRMDecrypt(dword, dword, dword, void*, void*, void*)")
# 呼び出し: DRMDecrypt(hCryptoProvider, iPosition, cNumInBytes, pbInData, pcNumOutBytes, pbOutData)
# hCryptoProvider : DWORD -> "dword"
# iPosition : DWORD -> "dword"
# cNumInBytes : DWORD -> "dword"
# pbInData : BYTE* in/out -> "void*"
# pcNumOutBytes : DWORD* in/out -> "void*"
# pbOutData : BYTE* 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)。