将const unsigned char *传递给C＃DLL [英] Pass const unsigned char* to C# DLL

问题描述

起初我想提一下我是c ++的新手。



i正在使用c ++核心系统服务器端应用程序（非托管），C＃auth系统服务器端应用程序和C＃客户端应用程序。我正在使用简单的2个函数来加密/解密服务器和客户端之间的数据包加密和解密在2个c＃应用程序（客户端和身份验证系统服务器）之间完美运行



我尝试过：



i试图在C ++核心服务器中使用相同的系统类/函数，如

at first i would like to mention that i am new to c++.

i am working on a c++ core system server side application(unmanaged), C# auth system server side application and C# client side application. i am using a simple 2 functions to encrypt/decrypt packets between server`s and client Encrypt and Decrypt is working perfect between 2 c# apps (client and auth system server)

What I have tried:

i tried to use the same system class`s/functions in C++ core server using it like

using System::IO;
using System::Security::Cryptography;

但是没能在C ++应用程序中完成完整的代码。



这让我想到我在C＃中创建.dll包含加密的两个函数/用c ++解密数据？



这里是C＃.dll代码密码学

but failed to complete the full code in C++ app.

so that`s got me thinking of how about i create .dll in C# contains those two functions to encrypt/decrypt data in c++ ?

and here is C# .dll code Cryptography

using System.Security.Cryptography;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices;
using System;

namespace __Security
{

    [Guid("413A1D2D-B7A8-42D7-8751-EB5D87F98873")]
    [ClassInterface(ClassInterfaceType.None)]
    [ProgId("__Security.Cryptography")]
    public class Cryptography : ICryptography
    {
        string CryptographyKey = "TESTINGKEY";
        public char[] Decrypt(char[] IN)
        {
            char[] OUT;
            OUT = null;
            try
            {
                byte[] CLEAR_IN = IN.Select(c => (byte)c).ToArray();
                using (Aes encryptor = Aes.Create())
                {
                    Rfc2898DeriveBytes pdb = new Rfc2898DeriveBytes(CryptographyKey, new byte[] { 0x49, 0x76, 0x61, 0x6e, 0x20, 0x4d, 0x65, 0x64, 0x76, 0x65, 0x64, 0x65, 0x76 });
                    encryptor.Key = pdb.GetBytes(32);
                    encryptor.IV = pdb.GetBytes(16);
                    using (MemoryStream ms = new MemoryStream())
                    {
                        using (CryptoStream cs = new CryptoStream(ms, encryptor.CreateDecryptor(), CryptoStreamMode.Write))
                        {
                            cs.Write(CLEAR_IN, 0, CLEAR_IN.Length);
                            cs.Close();
                        }
                        OUT = System.Text.Encoding.Unicode.GetChars(ms.ToArray());
                    }
                }
            }
            catch(System.Exception E) { Debugger.Debug(E.Message); Debugger.Debug(E.StackTrace); };
            return OUT;
        }
    }
}

ICryptography

ICryptography

using System;
using System.Runtime.InteropServices;

namespace __Security
{
    [Guid("B057AB41-D218-44AC-BEE6-66D41AC1AD90")]
    [InterfaceType(ComInterfaceType.InterfaceIsDual)]
    public interface ICryptography
    {
        [DispId(1)]
        char[] Encrypt(char[] IN);
        char[] Decrypt(char[] IN);
    };
}

和c ++应用程序我做了这样的事情：

and in c++ application i made something like this:

#include <list>
#import "__Security.tlb" raw_interfaces_only
using namespace __Security;

unsigned char* Kernel::Decrypt(unsigned char* _IN, int Len)
{
    HRESULT hr = CoInitialize(NULL);
    ICryptographyPtr _Cryptography(__uuidof(Cryptography));
    SAFEARRAY* SAFEARRAY_IN = GetSafeArray(_IN, 0);

    SAFEARRAY* *SAFEARRAY_OUT;//this is for return value
    HRESULT hr3 = _Cryptography->Decrypt(SAFEARRAY_IN, SAFEARRAY_OUT);

    if (!SUCCEEDED(hr3))// always fails
    {
        _com_error err(hr3);
        LPCTSTR errMsg = err.ErrorMessage();
        _tprintf(errMsg);
    }
    CoUninitialize();
    unsigned char* _OUT = new unsigned  char[Len];
    return _OUT;
}

SAFEARRAY* Kernel::GetSafeArray(const unsigned char* source, int codePage)
{
    int Size = sizeof(source);
    CComSafeArray<BSTR> result(1);
        BSTR bstr = (BSTR)source;
        BSTR bstr2 = SysAllocString(bstr);
        HRESULT hr = result.SetAt(0, bstr2, FALSE);
        if (FAILED(hr))
            AtlThrow(hr);
    return result.Detach();
}

因此，当我尝试调试C＃.dll时，我收到了一条带有
$ b $的异常消息b

So when i tried to debug C# .dll i got an exception message with

SafeArrayTypeMismatchException  

现在我需要知道如何安全地将const unsigned char *发送到C＃dll在加密/解密后收回它。



如果这是我继续的错误方式...那么如何转换我的C＃Cryptography类/函数转换为c ++，与所有3个系统应用程序兼容。

Now i need to know how to safely send the const unsigned char* to C# dll and receive it back after doing encryption/decryption.

if that`s is the wrong way i go on... so how do i convert my C# Cryptography class/functions into c++ with to be compatible with all 3 system apps.

推荐答案

为什么使用char数组？ COM能够使用字符串。

Why are you using char arrays? COM is capable of using strings.

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