内存中无符号字符加密

Question

我正在尝试使用Crypto ++使用AES256在内存文件中创建字节数组加密/解密。

我还需要加密一个无符号的字符字节数组，并获得加密的数据作为无符号的字符字节数组！ 解密也一样。

我尝试了很多在网上找到的解决方案，但无法使其正常工作。 输出文件和长度错误。

我该如何运作？

---

block_aes.h：

const unsigned char original_Data[42] = {
    0x54, 0x48, 0x49, 0x53, 0x20, 0x49, 0x53, 0x20, 0x54, 0x45, 0x53, 0x54,
    0x20, 0x44, 0x41, 0x54, 0x41, 0x20, 0x49, 0x54, 0x20, 0x43, 0x41, 0x4E,
    0x20, 0x42, 0x45, 0x20, 0x41, 0x4E, 0x59, 0x20, 0x46, 0x49, 0x4C, 0x45,
    0x20, 0x44, 0x41, 0x54, 0x41, 0x2E
};

const unsigned char iv[16] = {
    0xAE, 0x50, 0x95, 0xEB, 0xC5, 0x76, 0x20, 0x1A, 0xA4, 0x84, 0xB6, 0xB0,
    0x51, 0x03, 0xEE, 0xE8
};

const unsigned char key[32] = {
    0xDA, 0x1F, 0x84, 0x85, 0xBD, 0x62, 0x2D, 0xB1, 0x45, 0x13, 0x84, 0x20,
    0xCF, 0x02, 0x47, 0xB9, 0x85, 0xEC, 0x78, 0xD7, 0x85, 0xEF, 0x07, 0xD7,
    0xA8, 0x15, 0x11, 0x6E, 0x11, 0xDF, 0xEE, 0x39
};

block_aes.cpp：

int _tmain(int argc, _TCHAR* argv[])
{
    /// Encrypt
    vector<CryptoPP::byte> cipher;

    CBC_Mode<AES>::Encryption enc;
    enc.SetKeyWithIV(key, sizeof(key), iv, sizeof(iv));

    cipher.resize(sizeof(original_Data)+AES::BLOCKSIZE);
    ArraySink cs(&cipher[0], cipher.size());

    ArraySource(original_Data,sizeof(original_Data), true,
        new StreamTransformationFilter(enc, new Redirector(cs)));
    cipher.resize(cs.TotalPutLength());

    /// Test
    DWORD tmp;
    HANDLE File_Out = CreateFileA(
        "Encrypted.File",
        GENERIC_ALL,
        FILE_SHARE_WRITE,
        NULL,
        CREATE_NEW,
        FILE_ATTRIBUTE_NORMAL,
        &tmp
    );

    WriteFile(File_Out, &cipher, sizeof(cipher), &tmp, NULL);

    /// Decrypt
    vector<CryptoPP::byte> recover;
    CBC_Mode<AES>::Decryption dec;
    dec.SetKeyWithIV(key, sizeof(key), iv, sizeof(iv));

    recover.resize(cipher.size());
    ArraySink rs(&recover[0], recover.size());

    ArraySource(cipher.data(), cipher.size(), true,
        new StreamTransformationFilter(dec, new Redirector(rs)));

    recover.resize(rs.TotalPutLength());

    /// Test    
    HANDLE File_Out2 = CreateFileA(
        "Decrypted.File",
        GENERIC_ALL,
        FILE_SHARE_WRITE,
        NULL,
        CREATE_NEW,
        FILE_ATTRIBUTE_NORMAL,
        &tmp
    );

    WriteFile(File_Out2, &recover, sizeof(recover), &tmp, NULL);
}

Answer 1

在WriteFile调用中，写出cipher 变量的内容，而不是向量中存储的内容。 要保存向量，您需要

WriteFile(File_Out, cipher.data(), cipher.size(), &tmp, NULL);

和：

WriteFile(File_Out2, recover.data(), recover.size(), &tmp, NULL);

由于您使用了address-of运算符，因此这里是另一种写法：

WriteFile(File_Out, &cipher[0], cipher.size(), &tmp, NULL);

&cipher[0]是在C ++ 03和C ++ 11中获取非常量指针（可写）的唯一方法。 （但由于const指针（可读）工作正常，因此您在这里不需要它）。