ホーム › Security.Cryptography › CertCreateCertificateContext

CertCreateCertificateContext

関数

エンコードされた証明書から証明書コンテキストを作成する。

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>

CERT_CONTEXT* CertCreateCertificateContext(
    CERT_QUERY_ENCODING_TYPE dwCertEncodingType,
    const BYTE* pbCertEncoded,
    DWORD cbCertEncoded
);

パラメーター

名前	型	方向
dwCertEncodingType	CERT_QUERY_ENCODING_TYPE	in
pbCertEncoded	BYTE*	in
cbCertEncoded	DWORD	in

戻り値の型: CERT_CONTEXT*

各言語での呼び出し定義

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

CERT_CONTEXT* CertCreateCertificateContext(
    CERT_QUERY_ENCODING_TYPE dwCertEncodingType,
    const BYTE* pbCertEncoded,
    DWORD cbCertEncoded
);

[DllImport("CRYPT32.dll", SetLastError = true, ExactSpelling = true)]
static extern IntPtr CertCreateCertificateContext(
    uint dwCertEncodingType,   // CERT_QUERY_ENCODING_TYPE
    IntPtr pbCertEncoded,   // BYTE*
    uint cbCertEncoded   // DWORD
);

<DllImport("CRYPT32.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Function CertCreateCertificateContext(
    dwCertEncodingType As UInteger,   ' CERT_QUERY_ENCODING_TYPE
    pbCertEncoded As IntPtr,   ' BYTE*
    cbCertEncoded As UInteger   ' DWORD
) As IntPtr
End Function

' dwCertEncodingType : CERT_QUERY_ENCODING_TYPE
' pbCertEncoded : BYTE*
' cbCertEncoded : DWORD
Declare PtrSafe Function CertCreateCertificateContext Lib "crypt32" ( _
    ByVal dwCertEncodingType As Long, _
    ByVal pbCertEncoded As LongPtr, _
    ByVal cbCertEncoded As Long) As LongPtr
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

CertCreateCertificateContext = ctypes.windll.crypt32.CertCreateCertificateContext
CertCreateCertificateContext.restype = ctypes.c_void_p
CertCreateCertificateContext.argtypes = [
    wintypes.DWORD,  # dwCertEncodingType : CERT_QUERY_ENCODING_TYPE
    ctypes.POINTER(ctypes.c_ubyte),  # pbCertEncoded : BYTE*
    wintypes.DWORD,  # cbCertEncoded : DWORD
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('CRYPT32.dll')
CertCreateCertificateContext = Fiddle::Function.new(
  lib['CertCreateCertificateContext'],
  [
    -Fiddle::TYPE_INT,  # dwCertEncodingType : CERT_QUERY_ENCODING_TYPE
    Fiddle::TYPE_VOIDP,  # pbCertEncoded : BYTE*
    -Fiddle::TYPE_INT,  # cbCertEncoded : DWORD
  ],
  Fiddle::TYPE_VOIDP)

#[link(name = "crypt32")]
extern "system" {
    fn CertCreateCertificateContext(
        dwCertEncodingType: u32,  // CERT_QUERY_ENCODING_TYPE
        pbCertEncoded: *const u8,  // BYTE*
        cbCertEncoded: u32  // DWORD
    ) -> *mut CERT_CONTEXT;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("CRYPT32.dll", SetLastError = true)]
public static extern IntPtr CertCreateCertificateContext(uint dwCertEncodingType, IntPtr pbCertEncoded, uint cbCertEncoded);
"@
$api = Add-Type -MemberDefinition $sig -Name 'CRYPT32_CertCreateCertificateContext' -Namespace Win32 -PassThru
# $api::CertCreateCertificateContext(dwCertEncodingType, pbCertEncoded, cbCertEncoded)

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

; CERT_CONTEXT* CertCreateCertificateContext(CERT_QUERY_ENCODING_TYPE dwCertEncodingType, BYTE* pbCertEncoded, DWORD cbCertEncoded)
#uselib "CRYPT32.dll"
#cfunc global CertCreateCertificateContext "CertCreateCertificateContext" int, var, int
; res = CertCreateCertificateContext(dwCertEncodingType, pbCertEncoded, cbCertEncoded)
; dwCertEncodingType : CERT_QUERY_ENCODING_TYPE -> "int"
; pbCertEncoded : BYTE* -> "var"
; cbCertEncoded : 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。; CERT_CONTEXT* CertCreateCertificateContext(CERT_QUERY_ENCODING_TYPE dwCertEncodingType, BYTE* pbCertEncoded, DWORD cbCertEncoded)
#uselib "CRYPT32.dll"
#cfunc global CertCreateCertificateContext "CertCreateCertificateContext" int, intptr, int
; res = CertCreateCertificateContext(dwCertEncodingType, varptr(pbCertEncoded), cbCertEncoded)
; dwCertEncodingType : CERT_QUERY_ENCODING_TYPE -> "int"
; pbCertEncoded : BYTE* -> "intptr"
; cbCertEncoded : 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")
	procCertCreateCertificateContext = crypt32.NewProc("CertCreateCertificateContext")
)

// dwCertEncodingType (CERT_QUERY_ENCODING_TYPE), pbCertEncoded (BYTE*), cbCertEncoded (DWORD)
r1, _, err := procCertCreateCertificateContext.Call(
	uintptr(dwCertEncodingType),
	uintptr(pbCertEncoded),
	uintptr(cbCertEncoded),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // CERT_CONTEXT*

function CertCreateCertificateContext(
  dwCertEncodingType: DWORD;   // CERT_QUERY_ENCODING_TYPE
  pbCertEncoded: Pointer;   // BYTE*
  cbCertEncoded: DWORD   // DWORD
): Pointer; stdcall;
  external 'CRYPT32.dll' name 'CertCreateCertificateContext';

result := DllCall("CRYPT32\CertCreateCertificateContext"
    , "UInt", dwCertEncodingType   ; CERT_QUERY_ENCODING_TYPE
    , "Ptr", pbCertEncoded   ; BYTE*
    , "UInt", cbCertEncoded   ; DWORD
    , "Ptr")   ; return: CERT_CONTEXT*

●CertCreateCertificateContext(dwCertEncodingType, pbCertEncoded, cbCertEncoded) = DLL("CRYPT32.dll", "void* CertCreateCertificateContext(dword, void*, dword)")
# 呼び出し: CertCreateCertificateContext(dwCertEncodingType, pbCertEncoded, cbCertEncoded)
# dwCertEncodingType : CERT_QUERY_ENCODING_TYPE -> "dword"
# pbCertEncoded : BYTE* -> "void*"
# cbCertEncoded : 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)。