ホーム › Security.Cryptography › CryptGetMessageSignerCount

CryptGetMessageSignerCount

関数

署名付きメッセージに含まれる署名者の数を取得する。

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>

INT CryptGetMessageSignerCount(
    DWORD dwMsgEncodingType,
    const BYTE* pbSignedBlob,
    DWORD cbSignedBlob
);

パラメーター

名前	型	方向
dwMsgEncodingType	DWORD	in
pbSignedBlob	BYTE*	in
cbSignedBlob	DWORD	in

戻り値の型: INT

各言語での呼び出し定義

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

INT CryptGetMessageSignerCount(
    DWORD dwMsgEncodingType,
    const BYTE* pbSignedBlob,
    DWORD cbSignedBlob
);

[DllImport("CRYPT32.dll", SetLastError = true, ExactSpelling = true)]
static extern int CryptGetMessageSignerCount(
    uint dwMsgEncodingType,   // DWORD
    IntPtr pbSignedBlob,   // BYTE*
    uint cbSignedBlob   // DWORD
);

<DllImport("CRYPT32.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Function CryptGetMessageSignerCount(
    dwMsgEncodingType As UInteger,   ' DWORD
    pbSignedBlob As IntPtr,   ' BYTE*
    cbSignedBlob As UInteger   ' DWORD
) As Integer
End Function

' dwMsgEncodingType : DWORD
' pbSignedBlob : BYTE*
' cbSignedBlob : DWORD
Declare PtrSafe Function CryptGetMessageSignerCount Lib "crypt32" ( _
    ByVal dwMsgEncodingType As Long, _
    ByVal pbSignedBlob As LongPtr, _
    ByVal cbSignedBlob 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

CryptGetMessageSignerCount = ctypes.windll.crypt32.CryptGetMessageSignerCount
CryptGetMessageSignerCount.restype = ctypes.c_int
CryptGetMessageSignerCount.argtypes = [
    wintypes.DWORD,  # dwMsgEncodingType : DWORD
    ctypes.POINTER(ctypes.c_ubyte),  # pbSignedBlob : BYTE*
    wintypes.DWORD,  # cbSignedBlob : DWORD
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('CRYPT32.dll')
CryptGetMessageSignerCount = Fiddle::Function.new(
  lib['CryptGetMessageSignerCount'],
  [
    -Fiddle::TYPE_INT,  # dwMsgEncodingType : DWORD
    Fiddle::TYPE_VOIDP,  # pbSignedBlob : BYTE*
    -Fiddle::TYPE_INT,  # cbSignedBlob : DWORD
  ],
  Fiddle::TYPE_INT)

#[link(name = "crypt32")]
extern "system" {
    fn CryptGetMessageSignerCount(
        dwMsgEncodingType: u32,  // DWORD
        pbSignedBlob: *const u8,  // BYTE*
        cbSignedBlob: u32  // DWORD
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("CRYPT32.dll", SetLastError = true)]
public static extern int CryptGetMessageSignerCount(uint dwMsgEncodingType, IntPtr pbSignedBlob, uint cbSignedBlob);
"@
$api = Add-Type -MemberDefinition $sig -Name 'CRYPT32_CryptGetMessageSignerCount' -Namespace Win32 -PassThru
# $api::CryptGetMessageSignerCount(dwMsgEncodingType, pbSignedBlob, cbSignedBlob)

#uselib "CRYPT32.dll"
#func global CryptGetMessageSignerCount "CryptGetMessageSignerCount" sptr, sptr, sptr
; CryptGetMessageSignerCount dwMsgEncodingType, varptr(pbSignedBlob), cbSignedBlob   ; 戻り値は stat
; dwMsgEncodingType : DWORD -> "sptr"
; pbSignedBlob : BYTE* -> "sptr"
; cbSignedBlob : DWORD -> "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 CryptGetMessageSignerCount "CryptGetMessageSignerCount" int, var, int
; res = CryptGetMessageSignerCount(dwMsgEncodingType, pbSignedBlob, cbSignedBlob)
; dwMsgEncodingType : DWORD -> "int"
; pbSignedBlob : BYTE* -> "var"
; cbSignedBlob : DWORD -> "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 "CRYPT32.dll"
#cfunc global CryptGetMessageSignerCount "CryptGetMessageSignerCount" int, sptr, int
; res = CryptGetMessageSignerCount(dwMsgEncodingType, varptr(pbSignedBlob), cbSignedBlob)
; dwMsgEncodingType : DWORD -> "int"
; pbSignedBlob : BYTE* -> "sptr"
; cbSignedBlob : DWORD -> "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:

; INT CryptGetMessageSignerCount(DWORD dwMsgEncodingType, BYTE* pbSignedBlob, DWORD cbSignedBlob)
#uselib "CRYPT32.dll"
#cfunc global CryptGetMessageSignerCount "CryptGetMessageSignerCount" int, var, int
; res = CryptGetMessageSignerCount(dwMsgEncodingType, pbSignedBlob, cbSignedBlob)
; dwMsgEncodingType : DWORD -> "int"
; pbSignedBlob : BYTE* -> "var"
; cbSignedBlob : DWORD -> "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。; INT CryptGetMessageSignerCount(DWORD dwMsgEncodingType, BYTE* pbSignedBlob, DWORD cbSignedBlob)
#uselib "CRYPT32.dll"
#cfunc global CryptGetMessageSignerCount "CryptGetMessageSignerCount" int, intptr, int
; res = CryptGetMessageSignerCount(dwMsgEncodingType, varptr(pbSignedBlob), cbSignedBlob)
; dwMsgEncodingType : DWORD -> "int"
; pbSignedBlob : BYTE* -> "intptr"
; cbSignedBlob : DWORD -> "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 (
	crypt32 = windows.NewLazySystemDLL("CRYPT32.dll")
	procCryptGetMessageSignerCount = crypt32.NewProc("CryptGetMessageSignerCount")
)

// dwMsgEncodingType (DWORD), pbSignedBlob (BYTE*), cbSignedBlob (DWORD)
r1, _, err := procCryptGetMessageSignerCount.Call(
	uintptr(dwMsgEncodingType),
	uintptr(pbSignedBlob),
	uintptr(cbSignedBlob),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // INT

function CryptGetMessageSignerCount(
  dwMsgEncodingType: DWORD;   // DWORD
  pbSignedBlob: Pointer;   // BYTE*
  cbSignedBlob: DWORD   // DWORD
): Integer; stdcall;
  external 'CRYPT32.dll' name 'CryptGetMessageSignerCount';

result := DllCall("CRYPT32\CryptGetMessageSignerCount"
    , "UInt", dwMsgEncodingType   ; DWORD
    , "Ptr", pbSignedBlob   ; BYTE*
    , "UInt", cbSignedBlob   ; DWORD
    , "Int")   ; return: INT

●CryptGetMessageSignerCount(dwMsgEncodingType, pbSignedBlob, cbSignedBlob) = DLL("CRYPT32.dll", "int CryptGetMessageSignerCount(dword, void*, dword)")
# 呼び出し: CryptGetMessageSignerCount(dwMsgEncodingType, pbSignedBlob, cbSignedBlob)
# dwMsgEncodingType : DWORD -> "dword"
# pbSignedBlob : BYTE* -> "void*"
# cbSignedBlob : DWORD -> "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)。