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CertGetPublicKeyLength

関数

公開鍵情報からビット単位の鍵長を取得する。

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>

DWORD CertGetPublicKeyLength(
    CERT_QUERY_ENCODING_TYPE dwCertEncodingType,
    CERT_PUBLIC_KEY_INFO* pPublicKey
);

パラメーター

名前	型	方向
dwCertEncodingType	CERT_QUERY_ENCODING_TYPE	in
pPublicKey	CERT_PUBLIC_KEY_INFO*	in

戻り値の型: DWORD

各言語での呼び出し定義

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

DWORD CertGetPublicKeyLength(
    CERT_QUERY_ENCODING_TYPE dwCertEncodingType,
    CERT_PUBLIC_KEY_INFO* pPublicKey
);

[DllImport("CRYPT32.dll", SetLastError = true, ExactSpelling = true)]
static extern uint CertGetPublicKeyLength(
    uint dwCertEncodingType,   // CERT_QUERY_ENCODING_TYPE
    IntPtr pPublicKey   // CERT_PUBLIC_KEY_INFO*
);

<DllImport("CRYPT32.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Function CertGetPublicKeyLength(
    dwCertEncodingType As UInteger,   ' CERT_QUERY_ENCODING_TYPE
    pPublicKey As IntPtr   ' CERT_PUBLIC_KEY_INFO*
) As UInteger
End Function

' dwCertEncodingType : CERT_QUERY_ENCODING_TYPE
' pPublicKey : CERT_PUBLIC_KEY_INFO*
Declare PtrSafe Function CertGetPublicKeyLength Lib "crypt32" ( _
    ByVal dwCertEncodingType As Long, _
    ByVal pPublicKey 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

CertGetPublicKeyLength = ctypes.windll.crypt32.CertGetPublicKeyLength
CertGetPublicKeyLength.restype = wintypes.DWORD
CertGetPublicKeyLength.argtypes = [
    wintypes.DWORD,  # dwCertEncodingType : CERT_QUERY_ENCODING_TYPE
    ctypes.c_void_p,  # pPublicKey : CERT_PUBLIC_KEY_INFO*
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('CRYPT32.dll')
CertGetPublicKeyLength = Fiddle::Function.new(
  lib['CertGetPublicKeyLength'],
  [
    -Fiddle::TYPE_INT,  # dwCertEncodingType : CERT_QUERY_ENCODING_TYPE
    Fiddle::TYPE_VOIDP,  # pPublicKey : CERT_PUBLIC_KEY_INFO*
  ],
  -Fiddle::TYPE_INT)

#[link(name = "crypt32")]
extern "system" {
    fn CertGetPublicKeyLength(
        dwCertEncodingType: u32,  // CERT_QUERY_ENCODING_TYPE
        pPublicKey: *mut CERT_PUBLIC_KEY_INFO  // CERT_PUBLIC_KEY_INFO*
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("CRYPT32.dll", SetLastError = true)]
public static extern uint CertGetPublicKeyLength(uint dwCertEncodingType, IntPtr pPublicKey);
"@
$api = Add-Type -MemberDefinition $sig -Name 'CRYPT32_CertGetPublicKeyLength' -Namespace Win32 -PassThru
# $api::CertGetPublicKeyLength(dwCertEncodingType, pPublicKey)

#uselib "CRYPT32.dll"
#func global CertGetPublicKeyLength "CertGetPublicKeyLength" sptr, sptr
; CertGetPublicKeyLength dwCertEncodingType, varptr(pPublicKey)   ; 戻り値は stat
; dwCertEncodingType : CERT_QUERY_ENCODING_TYPE -> "sptr"
; pPublicKey : CERT_PUBLIC_KEY_INFO* -> "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 CertGetPublicKeyLength "CertGetPublicKeyLength" int, var
; res = CertGetPublicKeyLength(dwCertEncodingType, pPublicKey)
; dwCertEncodingType : CERT_QUERY_ENCODING_TYPE -> "int"
; pPublicKey : CERT_PUBLIC_KEY_INFO* -> "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 CertGetPublicKeyLength "CertGetPublicKeyLength" int, sptr
; res = CertGetPublicKeyLength(dwCertEncodingType, varptr(pPublicKey))
; dwCertEncodingType : CERT_QUERY_ENCODING_TYPE -> "int"
; pPublicKey : CERT_PUBLIC_KEY_INFO* -> "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:

; DWORD CertGetPublicKeyLength(CERT_QUERY_ENCODING_TYPE dwCertEncodingType, CERT_PUBLIC_KEY_INFO* pPublicKey)
#uselib "CRYPT32.dll"
#cfunc global CertGetPublicKeyLength "CertGetPublicKeyLength" int, var
; res = CertGetPublicKeyLength(dwCertEncodingType, pPublicKey)
; dwCertEncodingType : CERT_QUERY_ENCODING_TYPE -> "int"
; pPublicKey : CERT_PUBLIC_KEY_INFO* -> "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。; DWORD CertGetPublicKeyLength(CERT_QUERY_ENCODING_TYPE dwCertEncodingType, CERT_PUBLIC_KEY_INFO* pPublicKey)
#uselib "CRYPT32.dll"
#cfunc global CertGetPublicKeyLength "CertGetPublicKeyLength" int, intptr
; res = CertGetPublicKeyLength(dwCertEncodingType, varptr(pPublicKey))
; dwCertEncodingType : CERT_QUERY_ENCODING_TYPE -> "int"
; pPublicKey : CERT_PUBLIC_KEY_INFO* -> "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")
	procCertGetPublicKeyLength = crypt32.NewProc("CertGetPublicKeyLength")
)

// dwCertEncodingType (CERT_QUERY_ENCODING_TYPE), pPublicKey (CERT_PUBLIC_KEY_INFO*)
r1, _, err := procCertGetPublicKeyLength.Call(
	uintptr(dwCertEncodingType),
	uintptr(pPublicKey),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function CertGetPublicKeyLength(
  dwCertEncodingType: DWORD;   // CERT_QUERY_ENCODING_TYPE
  pPublicKey: Pointer   // CERT_PUBLIC_KEY_INFO*
): DWORD; stdcall;
  external 'CRYPT32.dll' name 'CertGetPublicKeyLength';

result := DllCall("CRYPT32\CertGetPublicKeyLength"
    , "UInt", dwCertEncodingType   ; CERT_QUERY_ENCODING_TYPE
    , "Ptr", pPublicKey   ; CERT_PUBLIC_KEY_INFO*
    , "UInt")   ; return: DWORD

●CertGetPublicKeyLength(dwCertEncodingType, pPublicKey) = DLL("CRYPT32.dll", "dword CertGetPublicKeyLength(dword, void*)")
# 呼び出し: CertGetPublicKeyLength(dwCertEncodingType, pPublicKey)
# dwCertEncodingType : CERT_QUERY_ENCODING_TYPE -> "dword"
# pPublicKey : CERT_PUBLIC_KEY_INFO* -> "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)。