CMSG_CONTENT_ENCRYPT_INFO

using System;
using System.Runtime.InteropServices;

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
public struct CRYPT_INTEGER_BLOB
{
    public uint cbData;
    public IntPtr pbData;
}

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
public struct CRYPT_ALGORITHM_IDENTIFIER
{
    public IntPtr pszObjId;
    public CRYPT_INTEGER_BLOB Parameters;
}

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
public struct CMSG_CONTENT_ENCRYPT_INFO
{
    public uint cbSize;
    public UIntPtr hCryptProv;
    public CRYPT_ALGORITHM_IDENTIFIER ContentEncryptionAlgorithm;
    public IntPtr pvEncryptionAuxInfo;
    public uint cRecipients;
    public IntPtr rgCmsRecipients;
    public IntPtr pfnAlloc;
    public IntPtr pfnFree;
    public uint dwEncryptFlags;
    public _Anonymous_e__Union Anonymous;
    public uint dwFlags;
    [MarshalAs(UnmanagedType.Bool)] public bool fCNG;
    public IntPtr pbCNGContentEncryptKeyObject;
    public IntPtr pbContentEncryptKey;
    public uint cbContentEncryptKey;
}

Imports System.Runtime.InteropServices

<StructLayout(LayoutKind.Sequential, CharSet:=CharSet.Unicode)>
Public Structure CRYPT_INTEGER_BLOB
    Public cbData As UInteger
    Public pbData As IntPtr
End Structure

<StructLayout(LayoutKind.Sequential, CharSet:=CharSet.Unicode)>
Public Structure CRYPT_ALGORITHM_IDENTIFIER
    Public pszObjId As IntPtr
    Public Parameters As CRYPT_INTEGER_BLOB
End Structure

<StructLayout(LayoutKind.Sequential, CharSet:=CharSet.Unicode)>
Public Structure CMSG_CONTENT_ENCRYPT_INFO
    Public cbSize As UInteger
    Public hCryptProv As UIntPtr
    Public ContentEncryptionAlgorithm As CRYPT_ALGORITHM_IDENTIFIER
    Public pvEncryptionAuxInfo As IntPtr
    Public cRecipients As UInteger
    Public rgCmsRecipients As IntPtr
    Public pfnAlloc As IntPtr
    Public pfnFree As IntPtr
    Public dwEncryptFlags As UInteger
    Public Anonymous As _Anonymous_e__Union
    Public dwFlags As UInteger
    <MarshalAs(UnmanagedType.Bool)> Public fCNG As Boolean
    Public pbCNGContentEncryptKeyObject As IntPtr
    Public pbContentEncryptKey As IntPtr
    Public cbContentEncryptKey As UInteger
End Structure

import ctypes
from ctypes import wintypes

class CRYPT_INTEGER_BLOB(ctypes.Structure):
    _fields_ = [
        ("cbData", wintypes.DWORD),
        ("pbData", ctypes.c_void_p),
    ]

class CRYPT_ALGORITHM_IDENTIFIER(ctypes.Structure):
    _fields_ = [
        ("pszObjId", ctypes.c_void_p),
        ("Parameters", CRYPT_INTEGER_BLOB),
    ]

class CMSG_CONTENT_ENCRYPT_INFO(ctypes.Structure):
    _fields_ = [
        ("cbSize", wintypes.DWORD),
        ("hCryptProv", ctypes.c_size_t),
        ("ContentEncryptionAlgorithm", CRYPT_ALGORITHM_IDENTIFIER),
        ("pvEncryptionAuxInfo", ctypes.c_void_p),
        ("cRecipients", wintypes.DWORD),
        ("rgCmsRecipients", ctypes.c_void_p),
        ("pfnAlloc", ctypes.c_void_p),
        ("pfnFree", ctypes.c_void_p),
        ("dwEncryptFlags", wintypes.DWORD),
        ("Anonymous", _Anonymous_e__Union),
        ("dwFlags", wintypes.DWORD),
        ("fCNG", wintypes.BOOL),
        ("pbCNGContentEncryptKeyObject", ctypes.c_void_p),
        ("pbContentEncryptKey", ctypes.c_void_p),
        ("cbContentEncryptKey", wintypes.DWORD),
    ]

#[repr(C)]
pub struct CRYPT_INTEGER_BLOB {
    pub cbData: u32,
    pub pbData: *mut core::ffi::c_void,
}

#[repr(C)]
pub struct CRYPT_ALGORITHM_IDENTIFIER {
    pub pszObjId: *mut core::ffi::c_void,
    pub Parameters: CRYPT_INTEGER_BLOB,
}

#[repr(C)]
pub struct CMSG_CONTENT_ENCRYPT_INFO {
    pub cbSize: u32,
    pub hCryptProv: usize,
    pub ContentEncryptionAlgorithm: CRYPT_ALGORITHM_IDENTIFIER,
    pub pvEncryptionAuxInfo: *mut core::ffi::c_void,
    pub cRecipients: u32,
    pub rgCmsRecipients: *mut core::ffi::c_void,
    pub pfnAlloc: *mut core::ffi::c_void,
    pub pfnFree: *mut core::ffi::c_void,
    pub dwEncryptFlags: u32,
    pub Anonymous: _Anonymous_e__Union,
    pub dwFlags: u32,
    pub fCNG: i32,
    pub pbCNGContentEncryptKeyObject: *mut core::ffi::c_void,
    pub pbContentEncryptKey: *mut core::ffi::c_void,
    pub cbContentEncryptKey: u32,
}

import "golang.org/x/sys/windows"

type CRYPT_INTEGER_BLOB struct {
	cbData uint32
	pbData uintptr
}

type CRYPT_ALGORITHM_IDENTIFIER struct {
	pszObjId uintptr
	Parameters CRYPT_INTEGER_BLOB
}

type CMSG_CONTENT_ENCRYPT_INFO struct {
	cbSize uint32
	hCryptProv uintptr
	ContentEncryptionAlgorithm CRYPT_ALGORITHM_IDENTIFIER
	pvEncryptionAuxInfo uintptr
	cRecipients uint32
	rgCmsRecipients uintptr
	pfnAlloc uintptr
	pfnFree uintptr
	dwEncryptFlags uint32
	Anonymous _Anonymous_e__Union
	dwFlags uint32
	fCNG int32
	pbCNGContentEncryptKeyObject uintptr
	pbContentEncryptKey uintptr
	cbContentEncryptKey uint32
}

type
  CRYPT_INTEGER_BLOB = record
    cbData: DWORD;
    pbData: Pointer;
  end;

  CRYPT_ALGORITHM_IDENTIFIER = record
    pszObjId: Pointer;
    Parameters: CRYPT_INTEGER_BLOB;
  end;

  CMSG_CONTENT_ENCRYPT_INFO = record
    cbSize: DWORD;
    hCryptProv: NativeUInt;
    ContentEncryptionAlgorithm: CRYPT_ALGORITHM_IDENTIFIER;
    pvEncryptionAuxInfo: Pointer;
    cRecipients: DWORD;
    rgCmsRecipients: Pointer;
    pfnAlloc: Pointer;
    pfnFree: Pointer;
    dwEncryptFlags: DWORD;
    Anonymous: _Anonymous_e__Union;
    dwFlags: DWORD;
    fCNG: BOOL;
    pbCNGContentEncryptKeyObject: Pointer;
    pbContentEncryptKey: Pointer;
    cbContentEncryptKey: DWORD;
  end;

const CRYPT_INTEGER_BLOB = extern struct {
    cbData: u32,
    pbData: ?*anyopaque,
};

const CRYPT_ALGORITHM_IDENTIFIER = extern struct {
    pszObjId: ?*anyopaque,
    Parameters: CRYPT_INTEGER_BLOB,
};

const CMSG_CONTENT_ENCRYPT_INFO = extern struct {
    cbSize: u32,
    hCryptProv: usize,
    ContentEncryptionAlgorithm: CRYPT_ALGORITHM_IDENTIFIER,
    pvEncryptionAuxInfo: ?*anyopaque,
    cRecipients: u32,
    rgCmsRecipients: ?*anyopaque,
    pfnAlloc: ?*anyopaque,
    pfnFree: ?*anyopaque,
    dwEncryptFlags: u32,
    Anonymous: _Anonymous_e__Union,
    dwFlags: u32,
    fCNG: i32,
    pbCNGContentEncryptKeyObject: ?*anyopaque,
    pbContentEncryptKey: ?*anyopaque,
    cbContentEncryptKey: u32,
};

type
  CRYPT_INTEGER_BLOB {.bycopy.} = object
    cbData: uint32
    pbData: pointer

  CRYPT_ALGORITHM_IDENTIFIER {.bycopy.} = object
    pszObjId: pointer
    Parameters: CRYPT_INTEGER_BLOB

  CMSG_CONTENT_ENCRYPT_INFO {.bycopy.} = object
    cbSize: uint32
    hCryptProv: uint
    ContentEncryptionAlgorithm: CRYPT_ALGORITHM_IDENTIFIER
    pvEncryptionAuxInfo: pointer
    cRecipients: uint32
    rgCmsRecipients: pointer
    pfnAlloc: pointer
    pfnFree: pointer
    dwEncryptFlags: uint32
    Anonymous: _Anonymous_e__Union
    dwFlags: uint32
    fCNG: int32
    pbCNGContentEncryptKeyObject: pointer
    pbContentEncryptKey: pointer
    cbContentEncryptKey: uint32

struct CRYPT_INTEGER_BLOB
{
    uint cbData;
    void* pbData;
}

struct CRYPT_ALGORITHM_IDENTIFIER
{
    void* pszObjId;
    CRYPT_INTEGER_BLOB Parameters;
}

struct CMSG_CONTENT_ENCRYPT_INFO
{
    uint cbSize;
    size_t hCryptProv;
    CRYPT_ALGORITHM_IDENTIFIER ContentEncryptionAlgorithm;
    void* pvEncryptionAuxInfo;
    uint cRecipients;
    void* rgCmsRecipients;
    void* pfnAlloc;
    void* pfnFree;
    uint dwEncryptFlags;
    _Anonymous_e__Union Anonymous;
    uint dwFlags;
    int fCNG;
    void* pbCNGContentEncryptKeyObject;
    void* pbContentEncryptKey;
    uint cbContentEncryptKey;
}