BCryptEnumProviders

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

NTSTATUS BCryptEnumProviders(
    LPCWSTR pszAlgId,
    DWORD* pImplCount,
    BCRYPT_PROVIDER_NAME** ppImplList,
    DWORD dwFlags
);

<DllImport("bcrypt.dll", ExactSpelling:=True)>
Public Shared Function BCryptEnumProviders(
    <MarshalAs(UnmanagedType.LPWStr)> pszAlgId As String,   ' LPCWSTR
    <Out> ByRef pImplCount As UInteger,   ' DWORD* out
    ppImplList As IntPtr,   ' BCRYPT_PROVIDER_NAME** out
    dwFlags As UInteger   ' DWORD
) As Integer
End Function

' pszAlgId : LPCWSTR
' pImplCount : DWORD* out
' ppImplList : BCRYPT_PROVIDER_NAME** out
' dwFlags : DWORD
Declare PtrSafe Function BCryptEnumProviders Lib "bcrypt" ( _
    ByVal pszAlgId As LongPtr, _
    ByRef pImplCount As Long, _
    ByVal ppImplList As LongPtr, _
    ByVal dwFlags 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

BCryptEnumProviders = ctypes.windll.bcrypt.BCryptEnumProviders
BCryptEnumProviders.restype = ctypes.c_int
BCryptEnumProviders.argtypes = [
    wintypes.LPCWSTR,  # pszAlgId : LPCWSTR
    ctypes.POINTER(wintypes.DWORD),  # pImplCount : DWORD* out
    ctypes.c_void_p,  # ppImplList : BCRYPT_PROVIDER_NAME** out
    wintypes.DWORD,  # dwFlags : DWORD
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('bcrypt.dll')
BCryptEnumProviders = Fiddle::Function.new(
  lib['BCryptEnumProviders'],
  [
    Fiddle::TYPE_VOIDP,  # pszAlgId : LPCWSTR
    Fiddle::TYPE_VOIDP,  # pImplCount : DWORD* out
    Fiddle::TYPE_VOIDP,  # ppImplList : BCRYPT_PROVIDER_NAME** out
    -Fiddle::TYPE_INT,  # dwFlags : DWORD
  ],
  Fiddle::TYPE_INT)

#[link(name = "bcrypt")]
extern "system" {
    fn BCryptEnumProviders(
        pszAlgId: *const u16,  // LPCWSTR
        pImplCount: *mut u32,  // DWORD* out
        ppImplList: *mut *mut BCRYPT_PROVIDER_NAME,  // BCRYPT_PROVIDER_NAME** out
        dwFlags: u32  // DWORD
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("bcrypt.dll")]
public static extern int BCryptEnumProviders([MarshalAs(UnmanagedType.LPWStr)] string pszAlgId, out uint pImplCount, IntPtr ppImplList, uint dwFlags);
"@
$api = Add-Type -MemberDefinition $sig -Name 'bcrypt_BCryptEnumProviders' -Namespace Win32 -PassThru
# $api::BCryptEnumProviders(pszAlgId, pImplCount, ppImplList, dwFlags)

#uselib "bcrypt.dll"
#func global BCryptEnumProviders "BCryptEnumProviders" sptr, sptr, sptr, sptr
; BCryptEnumProviders pszAlgId, varptr(pImplCount), varptr(ppImplList), dwFlags   ; 戻り値は stat
; pszAlgId : LPCWSTR -> "sptr"
; pImplCount : DWORD* out -> "sptr"
; ppImplList : BCRYPT_PROVIDER_NAME** out -> "sptr"
; dwFlags : 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。

#uselib "bcrypt.dll"
#cfunc global BCryptEnumProviders "BCryptEnumProviders" wstr, var, var, int
; res = BCryptEnumProviders(pszAlgId, pImplCount, ppImplList, dwFlags)
; pszAlgId : LPCWSTR -> "wstr"
; pImplCount : DWORD* out -> "var"
; ppImplList : BCRYPT_PROVIDER_NAME** out -> "var"
; dwFlags : 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。

; NTSTATUS BCryptEnumProviders(LPCWSTR pszAlgId, DWORD* pImplCount, BCRYPT_PROVIDER_NAME** ppImplList, DWORD dwFlags)
#uselib "bcrypt.dll"
#cfunc global BCryptEnumProviders "BCryptEnumProviders" wstr, var, var, int
; res = BCryptEnumProviders(pszAlgId, pImplCount, ppImplList, dwFlags)
; pszAlgId : LPCWSTR -> "wstr"
; pImplCount : DWORD* out -> "var"
; ppImplList : BCRYPT_PROVIDER_NAME** out -> "var"
; dwFlags : 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。

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

var (
	bcrypt = windows.NewLazySystemDLL("bcrypt.dll")
	procBCryptEnumProviders = bcrypt.NewProc("BCryptEnumProviders")
)

// pszAlgId (LPCWSTR), pImplCount (DWORD* out), ppImplList (BCRYPT_PROVIDER_NAME** out), dwFlags (DWORD)
r1, _, err := procBCryptEnumProviders.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(pszAlgId))),
	uintptr(pImplCount),
	uintptr(ppImplList),
	uintptr(dwFlags),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // NTSTATUS

function BCryptEnumProviders(
  pszAlgId: PWideChar;   // LPCWSTR
  pImplCount: Pointer;   // DWORD* out
  ppImplList: Pointer;   // BCRYPT_PROVIDER_NAME** out
  dwFlags: DWORD   // DWORD
): Integer; stdcall;
  external 'bcrypt.dll' name 'BCryptEnumProviders';

result := DllCall("bcrypt\BCryptEnumProviders"
    , "WStr", pszAlgId   ; LPCWSTR
    , "Ptr", pImplCount   ; DWORD* out
    , "Ptr", ppImplList   ; BCRYPT_PROVIDER_NAME** out
    , "UInt", dwFlags   ; DWORD
    , "Int")   ; return: NTSTATUS

●BCryptEnumProviders(pszAlgId, pImplCount, ppImplList, dwFlags) = DLL("bcrypt.dll", "int BCryptEnumProviders(char*, void*, void*, dword)")
# 呼び出し: BCryptEnumProviders(pszAlgId, pImplCount, ppImplList, dwFlags)
# pszAlgId : LPCWSTR -> "char*"
# pImplCount : DWORD* out -> "void*"
# ppImplList : BCRYPT_PROVIDER_NAME** out -> "void*"
# dwFlags : 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)。