SslDecryptPacket

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

HRESULT SslDecryptPacket(
    NCRYPT_PROV_HANDLE hSslProvider,
    NCRYPT_KEY_HANDLE hKey,
    BYTE* pbInput,
    DWORD cbInput,
    BYTE* pbOutput,   // optional
    DWORD cbOutput,
    DWORD* pcbResult,
    ULONGLONG SequenceNumber,
    DWORD dwFlags
);

<DllImport("ncrypt.dll", ExactSpelling:=True)>
Public Shared Function SslDecryptPacket(
    hSslProvider As UIntPtr,   ' NCRYPT_PROV_HANDLE
    hKey As UIntPtr,   ' NCRYPT_KEY_HANDLE
    pbInput As IntPtr,   ' BYTE*
    cbInput As UInteger,   ' DWORD
    pbOutput As IntPtr,   ' BYTE* optional, out
    cbOutput As UInteger,   ' DWORD
    <Out> ByRef pcbResult As UInteger,   ' DWORD* out
    SequenceNumber As ULong,   ' ULONGLONG
    dwFlags As UInteger   ' DWORD
) As Integer
End Function

' hSslProvider : NCRYPT_PROV_HANDLE
' hKey : NCRYPT_KEY_HANDLE
' pbInput : BYTE*
' cbInput : DWORD
' pbOutput : BYTE* optional, out
' cbOutput : DWORD
' pcbResult : DWORD* out
' SequenceNumber : ULONGLONG
' dwFlags : DWORD
Declare PtrSafe Function SslDecryptPacket Lib "ncrypt" ( _
    ByVal hSslProvider As LongPtr, _
    ByVal hKey As LongPtr, _
    ByVal pbInput As LongPtr, _
    ByVal cbInput As Long, _
    ByVal pbOutput As LongPtr, _
    ByVal cbOutput As Long, _
    ByRef pcbResult As Long, _
    ByVal SequenceNumber As LongLong, _
    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

SslDecryptPacket = ctypes.windll.ncrypt.SslDecryptPacket
SslDecryptPacket.restype = ctypes.c_int
SslDecryptPacket.argtypes = [
    ctypes.c_size_t,  # hSslProvider : NCRYPT_PROV_HANDLE
    ctypes.c_size_t,  # hKey : NCRYPT_KEY_HANDLE
    ctypes.POINTER(ctypes.c_ubyte),  # pbInput : BYTE*
    wintypes.DWORD,  # cbInput : DWORD
    ctypes.POINTER(ctypes.c_ubyte),  # pbOutput : BYTE* optional, out
    wintypes.DWORD,  # cbOutput : DWORD
    ctypes.POINTER(wintypes.DWORD),  # pcbResult : DWORD* out
    ctypes.c_ulonglong,  # SequenceNumber : ULONGLONG
    wintypes.DWORD,  # dwFlags : DWORD
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('ncrypt.dll')
SslDecryptPacket = Fiddle::Function.new(
  lib['SslDecryptPacket'],
  [
    Fiddle::TYPE_UINTPTR_T,  # hSslProvider : NCRYPT_PROV_HANDLE
    Fiddle::TYPE_UINTPTR_T,  # hKey : NCRYPT_KEY_HANDLE
    Fiddle::TYPE_VOIDP,  # pbInput : BYTE*
    -Fiddle::TYPE_INT,  # cbInput : DWORD
    Fiddle::TYPE_VOIDP,  # pbOutput : BYTE* optional, out
    -Fiddle::TYPE_INT,  # cbOutput : DWORD
    Fiddle::TYPE_VOIDP,  # pcbResult : DWORD* out
    -Fiddle::TYPE_LONG_LONG,  # SequenceNumber : ULONGLONG
    -Fiddle::TYPE_INT,  # dwFlags : DWORD
  ],
  Fiddle::TYPE_INT)

#[link(name = "ncrypt")]
extern "system" {
    fn SslDecryptPacket(
        hSslProvider: usize,  // NCRYPT_PROV_HANDLE
        hKey: usize,  // NCRYPT_KEY_HANDLE
        pbInput: *mut u8,  // BYTE*
        cbInput: u32,  // DWORD
        pbOutput: *mut u8,  // BYTE* optional, out
        cbOutput: u32,  // DWORD
        pcbResult: *mut u32,  // DWORD* out
        SequenceNumber: u64,  // ULONGLONG
        dwFlags: u32  // DWORD
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("ncrypt.dll")]
public static extern int SslDecryptPacket(UIntPtr hSslProvider, UIntPtr hKey, IntPtr pbInput, uint cbInput, IntPtr pbOutput, uint cbOutput, out uint pcbResult, ulong SequenceNumber, uint dwFlags);
"@
$api = Add-Type -MemberDefinition $sig -Name 'ncrypt_SslDecryptPacket' -Namespace Win32 -PassThru
# $api::SslDecryptPacket(hSslProvider, hKey, pbInput, cbInput, pbOutput, cbOutput, pcbResult, SequenceNumber, dwFlags)

#uselib "ncrypt.dll"
#func global SslDecryptPacket "SslDecryptPacket" sptr, sptr, sptr, sptr, sptr, sptr, sptr, sptr, sptr
; SslDecryptPacket hSslProvider, hKey, varptr(pbInput), cbInput, varptr(pbOutput), cbOutput, varptr(pcbResult), SequenceNumber, dwFlags   ; 戻り値は stat
; hSslProvider : NCRYPT_PROV_HANDLE -> "sptr"
; hKey : NCRYPT_KEY_HANDLE -> "sptr"
; pbInput : BYTE* -> "sptr"
; cbInput : DWORD -> "sptr"
; pbOutput : BYTE* optional, out -> "sptr"
; cbOutput : DWORD -> "sptr"
; pcbResult : DWORD* out -> "sptr"
; SequenceNumber : ULONGLONG -> "sptr"
; dwFlags : DWORD -> "sptr"
; ※HSP3.7は int64 引数(64bit値渡し)に非対応です。
; ※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 "ncrypt.dll"
#cfunc global SslDecryptPacket "SslDecryptPacket" sptr, sptr, var, int, var, int, var, int64, int
; res = SslDecryptPacket(hSslProvider, hKey, pbInput, cbInput, pbOutput, cbOutput, pcbResult, SequenceNumber, dwFlags)
; hSslProvider : NCRYPT_PROV_HANDLE -> "sptr"
; hKey : NCRYPT_KEY_HANDLE -> "sptr"
; pbInput : BYTE* -> "var"
; cbInput : DWORD -> "int"
; pbOutput : BYTE* optional, out -> "var"
; cbOutput : DWORD -> "int"
; pcbResult : DWORD* out -> "var"
; SequenceNumber : ULONGLONG -> "int64"
; 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。
; ※int64 引数の DLL 値渡しは x64 ランタイム(hsp3_64)のみ対応(x86 は未対応)。

; HRESULT SslDecryptPacket(NCRYPT_PROV_HANDLE hSslProvider, NCRYPT_KEY_HANDLE hKey, BYTE* pbInput, DWORD cbInput, BYTE* pbOutput, DWORD cbOutput, DWORD* pcbResult, ULONGLONG SequenceNumber, DWORD dwFlags)
#uselib "ncrypt.dll"
#cfunc global SslDecryptPacket "SslDecryptPacket" intptr, intptr, var, int, var, int, var, int64, int
; res = SslDecryptPacket(hSslProvider, hKey, pbInput, cbInput, pbOutput, cbOutput, pcbResult, SequenceNumber, dwFlags)
; hSslProvider : NCRYPT_PROV_HANDLE -> "intptr"
; hKey : NCRYPT_KEY_HANDLE -> "intptr"
; pbInput : BYTE* -> "var"
; cbInput : DWORD -> "int"
; pbOutput : BYTE* optional, out -> "var"
; cbOutput : DWORD -> "int"
; pcbResult : DWORD* out -> "var"
; SequenceNumber : ULONGLONG -> "int64"
; 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 (
	ncrypt = windows.NewLazySystemDLL("ncrypt.dll")
	procSslDecryptPacket = ncrypt.NewProc("SslDecryptPacket")
)

// hSslProvider (NCRYPT_PROV_HANDLE), hKey (NCRYPT_KEY_HANDLE), pbInput (BYTE*), cbInput (DWORD), pbOutput (BYTE* optional, out), cbOutput (DWORD), pcbResult (DWORD* out), SequenceNumber (ULONGLONG), dwFlags (DWORD)
r1, _, err := procSslDecryptPacket.Call(
	uintptr(hSslProvider),
	uintptr(hKey),
	uintptr(pbInput),
	uintptr(cbInput),
	uintptr(pbOutput),
	uintptr(cbOutput),
	uintptr(pcbResult),
	uintptr(SequenceNumber),
	uintptr(dwFlags),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function SslDecryptPacket(
  hSslProvider: NativeUInt;   // NCRYPT_PROV_HANDLE
  hKey: NativeUInt;   // NCRYPT_KEY_HANDLE
  pbInput: Pointer;   // BYTE*
  cbInput: DWORD;   // DWORD
  pbOutput: Pointer;   // BYTE* optional, out
  cbOutput: DWORD;   // DWORD
  pcbResult: Pointer;   // DWORD* out
  SequenceNumber: UInt64;   // ULONGLONG
  dwFlags: DWORD   // DWORD
): Integer; stdcall;
  external 'ncrypt.dll' name 'SslDecryptPacket';

result := DllCall("ncrypt\SslDecryptPacket"
    , "UPtr", hSslProvider   ; NCRYPT_PROV_HANDLE
    , "UPtr", hKey   ; NCRYPT_KEY_HANDLE
    , "Ptr", pbInput   ; BYTE*
    , "UInt", cbInput   ; DWORD
    , "Ptr", pbOutput   ; BYTE* optional, out
    , "UInt", cbOutput   ; DWORD
    , "Ptr", pcbResult   ; DWORD* out
    , "Int64", SequenceNumber   ; ULONGLONG
    , "UInt", dwFlags   ; DWORD
    , "Int")   ; return: HRESULT

●SslDecryptPacket(hSslProvider, hKey, pbInput, cbInput, pbOutput, cbOutput, pcbResult, SequenceNumber, dwFlags) = DLL("ncrypt.dll", "int SslDecryptPacket(int, int, void*, dword, void*, dword, void*, qword, dword)")
# 呼び出し: SslDecryptPacket(hSslProvider, hKey, pbInput, cbInput, pbOutput, cbOutput, pcbResult, SequenceNumber, dwFlags)
# hSslProvider : NCRYPT_PROV_HANDLE -> "int"
# hKey : NCRYPT_KEY_HANDLE -> "int"
# pbInput : BYTE* -> "void*"
# cbInput : DWORD -> "dword"
# pbOutput : BYTE* optional, out -> "void*"
# cbOutput : DWORD -> "dword"
# pcbResult : DWORD* out -> "void*"
# SequenceNumber : ULONGLONG -> "qword"
# 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)。