如何将字节数组从 C++ 返回到 C#

所以我一直在为此苦苦挣扎。我正在尝试制作自己的AES 128库以与我的一个程序一起使用。该库测试并在C++中工作（非常适合加密功能）。我还没有实现其他的）"加密"功能是这样的：

新代码

void Aes128Class::EncryptBlock(BYTE* outBlock, const BYTE* inBlock, const BYTE* cipherBlock)
{
    BYTE temp[16] = {0x00};
    Galois::XorBlock(temp, inBlock);
    Galois::XorBlock(temp, cipherBlock);
    BYTE expandedKey[176] = {0x00};
    memcpy(expandedKey, Key, 16);
    Galois::expand_key(expandedKey);
    Galois::XorBlock(temp, expandedKey);
    for(int i=16; i<160; i+=16)
    {
        Galois::DoRound(temp, &expandedKey[i]);
    }
    Galois::SubBytes(temp);
    Galois::ShiftRows(temp);
    Galois::XorBlock(temp, &expandedKey[160]);
    memcpy(outBlock, temp, 16);
}
void Aes128Class::EncryptData(BYTE* outBlock, size_t& outlen, const BYTE* inBlock, size_t length)
{
    float blockSize = (float)(length/16);
    blockSize = ceilf(blockSize);
    int newLength = (int)(blockSize*16);
    BYTE* temp = (BYTE*)malloc(newLength);
    BYTE* padd = (BYTE*)malloc(newLength);
    memset(temp, 0, newLength);
    memcpy(padd, inBlock, length);
    EncryptBlock(temp, padd, IV);
    for (int i=1; i<blockSize; i++)
    {
        EncryptBlock(&temp[i*16], &padd[i*16], &temp[(i-1)*16]);
    }
    outlen = newLength;
    memcpy(outBlock, temp, newLength);
}

这个想法是，如果plainText不是 16 字节块增量，那么我强制它。因此，这会产生一个可变大小的字节数组。 它在我的C++测试中有效，但是当我在C#中调用它时，我遇到了一些不同的错误......这将需要一分钟来描述。

    [DllImport("CppAes128.dll", CallingConvention = CallingConvention.ThisCall,
        EntryPoint = "?EncryptData@Aes128Class@@QAEXPAEAAIPBEI@Z")]
    static extern void EncryptData(IntPtr pClass, ref IntPtr outblock, [Out]int OutLength, byte[] inBlock, int length);

当我调用它时，我得到了指向array和超长的有效指针。它现在的外观会导致访问冲突，但是如果我将[Out]int OutLength更改为ref IntPtr，我可以使该结构正常工作。 有趣的是，如果我ref int或ref uint它仍然"有效"。因此，如果我这样做，我会尝试读取intptr，然后我会收到访问冲突。我正在将其编译为.NET 4.0 x86 project（因为我在某处读到3.5在访问方面存在一些错误......

这是我在C#中尝试过的.它有点乱，因为我已经玩了几个小时（对不起）：

    public byte[] EncryptData(byte[] plainText, int length)
    {
        byte[] enc = null;
        int len = 0;
        IntPtr pArray = IntPtr.Zero;
        EncryptData(theClass, ref pArray, len, plainText, length);
        Console.WriteLine(len);
        //enc = new byte[len];
        //Marshal.Copy(pArray, enc, 0, len);
        //Marshal.Release(pArray);
        //try
        //{
        //    int elementSize = Marshal.SizeOf(typeof(IntPtr));
        //    //IntPtr unmanagedArray = Marshal.AllocHGlobal(10 * elementSize);
        //    Console.WriteLine("Reading unmanaged memory:");
        //    // Print the 10 elements of the C-style unmanagedArray 
        //    for (int i = 0; i < 10; i++)
        //    {
        //        Console.WriteLine("{0:X2}:", Marshal.ReadByte(pArray, i));
        //    }
        //    Marshal.FreeHGlobal(pArray);
        //}
        //catch (Exception ex)
        //{
        //    Console.WriteLine("{0}n{1}", ex.Source, ex.Message);
        //    Console.WriteLine("Win32({0})", Marshal.GetLastWin32Error());
        //}
        //Marshal.Release(pArray);
        return enc;
    }

唯一有效的时间是当我只制作了一个静态大小的数组并且没有使用ref或marshal副本或任何东西时。我想我的签名是这样的

static extern void EncryptData(IntPtr pClass, byte[] outBlock, byte[] inBlock, int length);

这几乎奏效了，但问题是，当我在那array上做一个foreach循环时，它总是我放的尺寸......至少可以说是令人沮丧的。

那么我做错了什么？我怎样才能让它工作？我对此感到非常沮丧。谢谢

哦，仅供参考，这是我不能再依赖cryptlib了。我正在尝试重新编译一个不同的项目，该项目使用 cryptlib 作为静态库而不是共享，这会导致我的编译选项出现一些问题，并且更改回来太麻烦了。

已编辑以显示更多代码

这是我使用的测试。我找到了一个显示一堆测试的网页，所以这是我实现的。

void VerifyEncrypt16(const BYTE* expected, const BYTE* key, const BYTE* iv, const BYTE* plainText)
{
    BYTE actual[16] = {0x00};
    Aes128Class aes;
    aes.SetKey(key, 16);
    aes.SetIV(iv, 16);
    size_t len = 0;
    aes.EncryptData(actual, len, plainText, 16);
    _ASSERT(CompareTwoArrays(expected, actual));
}
void VerifyEncrypt16String(const char* expected, const char* key, const char* iv, const char* plainText)
{
    BYTE e[16];
    BYTE k[16];
    BYTE i[16];
    BYTE p[16];
    ByteUtil::StringToHex(expected, e);
    ByteUtil::StringToHex(key, k);
    ByteUtil::StringToHex(iv, i);
    ByteUtil::StringToHex(plainText, p);
    VerifyEncrypt16(e, k, i, p);
}
void CheckEncrypt16(void)
{
    _RPT0(_CRT_WARN, "Checking Encryption of a 16 byte number IV set to 0n");
    //AESVS GFSbox test data for CBC
    VerifyEncrypt16String("0336763e966d92595a567cc9ce537f5e","00000000000000000000000000000000","00000000000000000000000000000000","f34481ec3cc627bacd5dc3fb08f273e6");
    VerifyEncrypt16String("a9a1631bf4996954ebc093957b234589","00000000000000000000000000000000","00000000000000000000000000000000","9798c4640bad75c7c3227db910174e72");
    VerifyEncrypt16String("ff4f8391a6a40ca5b25d23bedd44a597","00000000000000000000000000000000","00000000000000000000000000000000","96ab5c2ff612d9dfaae8c31f30c42168");
    VerifyEncrypt16String("dc43be40be0e53712f7e2bf5ca707209","00000000000000000000000000000000","00000000000000000000000000000000","6a118a874519e64e9963798a503f1d35");
    VerifyEncrypt16String("92beedab1895a94faa69b632e5cc47ce","00000000000000000000000000000000","00000000000000000000000000000000","cb9fceec81286ca3e989bd979b0cb284");
    VerifyEncrypt16String("459264f4798f6a78bacb89c15ed3d601","00000000000000000000000000000000","00000000000000000000000000000000","b26aeb1874e47ca8358ff22378f09144");
    VerifyEncrypt16String("08a4e2efec8a8e3312ca7460b9040bbf","00000000000000000000000000000000","00000000000000000000000000000000","58c8e00b2631686d54eab84b91f0aca1");
    //AESVS KeySbox test data for CBC
    VerifyEncrypt16String("6d251e6944b051e04eaa6fb4dbf78465","10a58869d74be5a374cf867cfb473859","00000000000000000000000000000000","00000000000000000000000000000000");
    //A TON OF MORE TESTS! etc etc etc        VerifyEncrypt16String("5c005e72c1418c44f569f2ea33ba54f3","00000000000000000000000000000000","00000000000000000000000000000000","fffffffffffffffffffffffffffffffe");
    VerifyEncrypt16String("3f5b8cc9ea855a0afa7347d23e8d664e","00000000000000000000000000000000","00000000000000000000000000000000","ffffffffffffffffffffffffffffffff");
}