CMSG_KEY_AGREE_RECIPIENT_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_KEY_AGREE_RECIPIENT_INFO
{
    public uint dwVersion;
    public uint dwOriginatorChoice;
    public _Anonymous_e__Union Anonymous;
    public CRYPT_INTEGER_BLOB UserKeyingMaterial;
    public CRYPT_ALGORITHM_IDENTIFIER KeyEncryptionAlgorithm;
    public uint cRecipientEncryptedKeys;
    public IntPtr rgpRecipientEncryptedKeys;
}

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_KEY_AGREE_RECIPIENT_INFO
    Public dwVersion As UInteger
    Public dwOriginatorChoice As UInteger
    Public Anonymous As _Anonymous_e__Union
    Public UserKeyingMaterial As CRYPT_INTEGER_BLOB
    Public KeyEncryptionAlgorithm As CRYPT_ALGORITHM_IDENTIFIER
    Public cRecipientEncryptedKeys As UInteger
    Public rgpRecipientEncryptedKeys As IntPtr
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_KEY_AGREE_RECIPIENT_INFO(ctypes.Structure):
    _fields_ = [
        ("dwVersion", wintypes.DWORD),
        ("dwOriginatorChoice", wintypes.DWORD),
        ("Anonymous", _Anonymous_e__Union),
        ("UserKeyingMaterial", CRYPT_INTEGER_BLOB),
        ("KeyEncryptionAlgorithm", CRYPT_ALGORITHM_IDENTIFIER),
        ("cRecipientEncryptedKeys", wintypes.DWORD),
        ("rgpRecipientEncryptedKeys", ctypes.c_void_p),
    ]

#[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_KEY_AGREE_RECIPIENT_INFO {
    pub dwVersion: u32,
    pub dwOriginatorChoice: u32,
    pub Anonymous: _Anonymous_e__Union,
    pub UserKeyingMaterial: CRYPT_INTEGER_BLOB,
    pub KeyEncryptionAlgorithm: CRYPT_ALGORITHM_IDENTIFIER,
    pub cRecipientEncryptedKeys: u32,
    pub rgpRecipientEncryptedKeys: *mut core::ffi::c_void,
}

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_KEY_AGREE_RECIPIENT_INFO struct {
	dwVersion uint32
	dwOriginatorChoice uint32
	Anonymous _Anonymous_e__Union
	UserKeyingMaterial CRYPT_INTEGER_BLOB
	KeyEncryptionAlgorithm CRYPT_ALGORITHM_IDENTIFIER
	cRecipientEncryptedKeys uint32
	rgpRecipientEncryptedKeys uintptr
}

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

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

  CMSG_KEY_AGREE_RECIPIENT_INFO = record
    dwVersion: DWORD;
    dwOriginatorChoice: DWORD;
    Anonymous: _Anonymous_e__Union;
    UserKeyingMaterial: CRYPT_INTEGER_BLOB;
    KeyEncryptionAlgorithm: CRYPT_ALGORITHM_IDENTIFIER;
    cRecipientEncryptedKeys: DWORD;
    rgpRecipientEncryptedKeys: Pointer;
  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_KEY_AGREE_RECIPIENT_INFO = extern struct {
    dwVersion: u32,
    dwOriginatorChoice: u32,
    Anonymous: _Anonymous_e__Union,
    UserKeyingMaterial: CRYPT_INTEGER_BLOB,
    KeyEncryptionAlgorithm: CRYPT_ALGORITHM_IDENTIFIER,
    cRecipientEncryptedKeys: u32,
    rgpRecipientEncryptedKeys: ?*anyopaque,
};

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

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

  CMSG_KEY_AGREE_RECIPIENT_INFO {.bycopy.} = object
    dwVersion: uint32
    dwOriginatorChoice: uint32
    Anonymous: _Anonymous_e__Union
    UserKeyingMaterial: CRYPT_INTEGER_BLOB
    KeyEncryptionAlgorithm: CRYPT_ALGORITHM_IDENTIFIER
    cRecipientEncryptedKeys: uint32
    rgpRecipientEncryptedKeys: pointer

struct CRYPT_INTEGER_BLOB
{
    uint cbData;
    void* pbData;
}

struct CRYPT_ALGORITHM_IDENTIFIER
{
    void* pszObjId;
    CRYPT_INTEGER_BLOB Parameters;
}

struct CMSG_KEY_AGREE_RECIPIENT_INFO
{
    uint dwVersion;
    uint dwOriginatorChoice;
    _Anonymous_e__Union Anonymous;
    CRYPT_INTEGER_BLOB UserKeyingMaterial;
    CRYPT_ALGORITHM_IDENTIFIER KeyEncryptionAlgorithm;
    uint cRecipientEncryptedKeys;
    void* rgpRecipientEncryptedKeys;
}