CRYPT_ENCRYPT_MESSAGE_PARA

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 CRYPT_ENCRYPT_MESSAGE_PARA
{
    public uint cbSize;
    public uint dwMsgEncodingType;
    public UIntPtr hCryptProv;
    public CRYPT_ALGORITHM_IDENTIFIER ContentEncryptionAlgorithm;
    public IntPtr pvEncryptionAuxInfo;
    public uint dwFlags;
    public uint dwInnerContentType;
}

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 CRYPT_ENCRYPT_MESSAGE_PARA
    Public cbSize As UInteger
    Public dwMsgEncodingType As UInteger
    Public hCryptProv As UIntPtr
    Public ContentEncryptionAlgorithm As CRYPT_ALGORITHM_IDENTIFIER
    Public pvEncryptionAuxInfo As IntPtr
    Public dwFlags As UInteger
    Public dwInnerContentType 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 CRYPT_ENCRYPT_MESSAGE_PARA(ctypes.Structure):
    _fields_ = [
        ("cbSize", wintypes.DWORD),
        ("dwMsgEncodingType", wintypes.DWORD),
        ("hCryptProv", ctypes.c_size_t),
        ("ContentEncryptionAlgorithm", CRYPT_ALGORITHM_IDENTIFIER),
        ("pvEncryptionAuxInfo", ctypes.c_void_p),
        ("dwFlags", wintypes.DWORD),
        ("dwInnerContentType", 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 CRYPT_ENCRYPT_MESSAGE_PARA {
    pub cbSize: u32,
    pub dwMsgEncodingType: u32,
    pub hCryptProv: usize,
    pub ContentEncryptionAlgorithm: CRYPT_ALGORITHM_IDENTIFIER,
    pub pvEncryptionAuxInfo: *mut core::ffi::c_void,
    pub dwFlags: u32,
    pub dwInnerContentType: 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 CRYPT_ENCRYPT_MESSAGE_PARA struct {
	cbSize uint32
	dwMsgEncodingType uint32
	hCryptProv uintptr
	ContentEncryptionAlgorithm CRYPT_ALGORITHM_IDENTIFIER
	pvEncryptionAuxInfo uintptr
	dwFlags uint32
	dwInnerContentType uint32
}

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

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

  CRYPT_ENCRYPT_MESSAGE_PARA = record
    cbSize: DWORD;
    dwMsgEncodingType: DWORD;
    hCryptProv: NativeUInt;
    ContentEncryptionAlgorithm: CRYPT_ALGORITHM_IDENTIFIER;
    pvEncryptionAuxInfo: Pointer;
    dwFlags: DWORD;
    dwInnerContentType: 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 CRYPT_ENCRYPT_MESSAGE_PARA = extern struct {
    cbSize: u32,
    dwMsgEncodingType: u32,
    hCryptProv: usize,
    ContentEncryptionAlgorithm: CRYPT_ALGORITHM_IDENTIFIER,
    pvEncryptionAuxInfo: ?*anyopaque,
    dwFlags: u32,
    dwInnerContentType: u32,
};

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

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

  CRYPT_ENCRYPT_MESSAGE_PARA {.bycopy.} = object
    cbSize: uint32
    dwMsgEncodingType: uint32
    hCryptProv: uint
    ContentEncryptionAlgorithm: CRYPT_ALGORITHM_IDENTIFIER
    pvEncryptionAuxInfo: pointer
    dwFlags: uint32
    dwInnerContentType: uint32

struct CRYPT_INTEGER_BLOB
{
    uint cbData;
    void* pbData;
}

struct CRYPT_ALGORITHM_IDENTIFIER
{
    void* pszObjId;
    CRYPT_INTEGER_BLOB Parameters;
}

struct CRYPT_ENCRYPT_MESSAGE_PARA
{
    uint cbSize;
    uint dwMsgEncodingType;
    size_t hCryptProv;
    CRYPT_ALGORITHM_IDENTIFIER ContentEncryptionAlgorithm;
    void* pvEncryptionAuxInfo;
    uint dwFlags;
    uint dwInnerContentType;
}