crypto.randomBytes 不接受 md5 生成的 utf8 字符串

Question

我的代码如下图：

let createCipher = (req, res) => {
    const token = req.body.token;
    let keyVal = req.body.keyVal;
    const codeToken = utf8.encode(token);
    keyVal = utf8.encode(keyVal);
    console.log("keyVal " + keyVal);
    let hash = crypto.createHash('md5').update(codeToken).digest('hex');
    console.log("hash " + hash);
    var sharedSecret = crypto.randomBytes(hash);
    var initializationVector = crypto.randomBytes(hash);
    console.log("iv " + initializationVector);
    var encrypted;
    cipher = crypto.Cipheriv('aes-128-cbc', sharedSecret, initializationVector);
    encrypted += cipher.update(keyVal, 'utf8', 'base64');
    encrypted += cipher.final('base64');
    res.json({
        status: '200',
        cipher: encrypted
    });
}

我已经按照下面给出的步骤编写了上面的代码：

1. UTF-8 编码 TempToken 字符串并生成它的 MD5 哈希。
2. UTF-8 对键值对字符串进行编码，并使用密码块链接 (CBC) 模式使用 AES-128 加密进行加密。 一种。将密钥和初始化向量 (IV) 设置为等于步骤 1 的结果。
3. Base64 编码 2 的结果

但是上面的代码给了我如下所示的错误：

TypeError: size must be a number >= 0
            <br> &nbsp; &nbsp;at TypeError (native)
            <br> &nbsp; &nbsp;at createCipher (C:\Users\anand\quFlipApi\controller\test.js:17:31)
            <br> &nbsp; &nbsp;at Layer.handle [as handle_request] (C:\Users\anand\quFlipApi\node_modules\express\lib\router\layer.js:95:5)
            <br> &nbsp; &nbsp;at trim_prefix (C:\Users\anand\quFlipApi\node_modules\express\lib\router\index.js:317:13)
            <br> &nbsp; &nbsp;at C:\Users\anand\quFlipApi\node_modules\express\lib\router\index.js:284:7
            <br> &nbsp; &nbsp;at Function.process_params (C:\Users\anand\quFlipApi\node_modules\express\lib\router\index.js:335:12)
            <br> &nbsp; &nbsp;at next (C:\Users\anand\quFlipApi\node_modules\express\lib\router\index.js:275:10)
            <br> &nbsp; &nbsp;at C:\Users\anand\quFlipApi\node_modules\express\lib\router\index.js:635:15
            <br> &nbsp; &nbsp;at next (C:\Users\anand\quFlipApi\node_modules\express\lib\router\index.js:260:14)
            <br> &nbsp; &nbsp;at Function.handle (C:\Users\anand\quFlipApi\node_modules\express\lib\router\index.js:174:3)
            <br> &nbsp; &nbsp;at router (C:\Users\anand\quFlipApi\node_modules\express\lib\router\index.js:47:12)
            <br> &nbsp; &nbsp;at Layer.handle [as handle_request] (C:\Users\anand\quFlipApi\node_modules\express\lib\router\layer.js:95:5)
            <br> &nbsp; &nbsp;at trim_prefix (C:\Users\anand\quFlipApi\node_modules\express\lib\router\index.js:317:13)
            <br> &nbsp; &nbsp;at C:\Users\anand\quFlipApi\node_modules\express\lib\router\index.js:284:7
            <br> &nbsp; &nbsp;at Function.process_params (C:\Users\anand\quFlipApi\node_modules\express\lib\router\index.js:335:12)
            <br> &nbsp; &nbsp;at next (C:\Users\anand\quFlipApi\node_modules\express\lib\router\index.js:275:10)
            <br> &nbsp; &nbsp;at C:\Users\anand\quFlipApi\node_modules\body-parser\lib\read.js:129:5
            <br> &nbsp; &nbsp;at invokeCallback (C:\Users\anand\quFlipApi\node_modules\raw-body\index.js:262:16)
            <br> &nbsp; &nbsp;at done (C:\Users\anand\quFlipApi\node_modules\raw-body\index.js:251:7)
            <br> &nbsp; &nbsp;at IncomingMessage.onEnd (C:\Users\anand\quFlipApi\node_modules\raw-body\index.js:307:7)
            <br> &nbsp; &nbsp;at emitNone (events.js:86:13)
            <br> &nbsp; &nbsp;at IncomingMessage.emit (events.js:185:7)

这里我的代码不接受crypto.randomBytes(hash) 中上一步生成的hash。这次执行中是否缺少任何方法？

Answer 1

crypto.randomBytestakes a number as argument，它返回随机字节，正如名字所说。

你不能给它一个字符串作为参数。

我真的不明白，为什么你会生成两次随机字节。也许这就足够了？

let hash = crypto.createHash('md5').update(codeToken).digest();
console.log("hash" + hash.toString('hex'));
var initializationVector = crypto.randomBytes(16);
console.log("iv " + initializationVector); 
var encrypted = crypto.Cipheriv('aes-128-cbc', hash, initializationVector);