Question

我遇到了用c ++加密数据，发送到Node.js服务器并在那里解密的问题。我正在使用Crypto ++，如果我加密并解密它，它可以正常工作。我尝试了各种模式，但似乎没有任何帮助。

我将密钥设置为32x'A'，IV设置为16x'\ 0'只是为了获得一致的数据

这是c ++中的代码

AutoSeededRandomPool rand;

// Generate a random key
SecByteBlock key(0x00, AES::MAX_KEYLENGTH);
//rand.GenerateBlock(key, key.size());
memset(key.BytePtr(), 'A', key.size());

// Generate a random IV
byte iv[AES::BLOCKSIZE];
//rand.GenerateBlock(iv, AES::BLOCKSIZE);
memset(iv, 0, AES::BLOCKSIZE);

char plainText[] = "AAAAAAAAAAAAAAA";
int messageLen = (int)strlen(plainText) + 1;

CFB_Mode<AES>::Encryption cfbEncryption(key, key.size(), iv);
cfbEncryption.ProcessData((byte*)plainText, (byte*)plainText, messageLen);

/*CFB_Mode<AES>::Decryption cfbDecryption(key, key.size(), iv);
cfbDecryption.ProcessData((byte*)plainText, (byte*)plainText, messageLen);*/

unsigned int messageLength = messageLen + key.size();
const auto testData = std::vector<byte>(sizeof(unsigned int) + messageLength);

memcpy((void*)&testData[0], reinterpret_cast<void*>(&messageLength), sizeof(unsigned int));
memcpy((void*)&testData[4], (void*)key.BytePtr(), key.size());
memcpy((void*)&testData[4+key.size()], (void*)plainText, messageLen);

testClient.Send(testData);

testClient.Disconnect();

这是Node.js中的代码

socket.on('data', (data) => {

        var messageSizeBuffer = data.slice(0, 4);
        var messageKeyBuffer = data.slice(4, 36);
        var messageDataBuffer = data.slice(36);

        var decipher = crypto.createDecipher('AES-256-CFB', messageKeyBuffer)
        var dec = Buffer.concat([decipher.update(messageDataBuffer) , decipher.final()]);

        console.log(dec.toString());
    });

Answer 1

我需要使用createDecipheriv并提供与加密中使用的初始化向量相同的初始化向量。注意硬编码密钥和iv，因为它仅用于在另一侧获取一致的数据。使用随机生成的密钥和iv。

代码现在看起来像这样

C ++

AutoSeededRandomPool rand;

// Generate a random key
SecByteBlock key(0x00, AES::MAX_KEYLENGTH);
//rand.GenerateBlock(key, key.size());
memset(key.BytePtr(), 'A', key.size());

// Generate a random IV
byte iv[AES::BLOCKSIZE];
//rand.GenerateBlock(iv, AES::BLOCKSIZE);
memset(iv, 0, AES::BLOCKSIZE);

char plainText[] = "AAAAAAAAAAAAAAA";
int messageLen = (int)strlen(plainText) + 1;

CFB_Mode<AES>::Encryption cfbEncryption(key, key.size(), iv);
cfbEncryption.ProcessData((byte*)plainText, (byte*)plainText, messageLen);


unsigned int messageLength = messageLen + key.size() + AES::BLOCKSIZE;
const auto testData = std::vector<byte>(sizeof(unsigned int) + messageLength);

auto currentIndex = 0;
memcpy((void*)&testData[currentIndex], reinterpret_cast<void*>(&messageLength), sizeof(unsigned int));
currentIndex += sizeof(unsigned int);
memcpy((void*)&testData[currentIndex], (void*)key.BytePtr(), key.size());
currentIndex += key.size();
memcpy((void*)&testData[currentIndex], iv, AES::BLOCKSIZE);
currentIndex += AES::BLOCKSIZE;
memcpy((void*)&testData[currentIndex], (void*)plainText, messageLen);

testClient.Send(testData);

testClient.Disconnect();

Node.js的

socket.on('data', (data) => {
    var messageSizeBuffer = data.slice(0, 4);
    var messageKeyBuffer = data.slice(4, 36);
    var messageIvBuffer = data.slice(36, 52);
    var messageDataBuffer = data.slice(52);

    var decipher = crypto.createDecipheriv('AES-256-CFB', messageKeyBuffer, messageIvBuffer)
    var dec = Buffer.concat([decipher.update(messageDataBuffer) , decipher.final()]);

    console.log(dec.toString());
});

Crypto ++和node.js的组合

1 个答案: