为什么我的 decipher.update 返回一个函数而不是解密的文本？节点JS

Question

我正在使用内置的加密模块，并且沮丧了好几个小时试图弄清楚为什么 decipher.update 返回一个函数而不是解密的文本本身。

代码：

const file = path.join(__dirname, '../secret.txt');
const fileIV = path.join(__dirname, '../iv.txt');
const at = path.join(__dirname, '../at.txt')
var secret = fs.readFileSync(file, 'utf-8');

const algorithm = 'aes-256-gcm';
var text = 'default'
var encrypted = secret;
const iv = crypto.randomBytes(16);

encrypt(plainText, key, iv) {
    const cipher = crypto.createCipheriv(algorithm, key, iv);
    return { encrypted: Buffer.concat([cipher.update(plainText), cipher.final()]), authTag: cipher.getAuthTag() }
}

decrypt(encrypted, key, iv, authTag) {
    const decipher = crypto.createDecipheriv(algorithm, key, iv).setAuthTag(authTag);
    console.log('this worked decrypt');
    return Buffer.concat([decipher.update(encrypted), decipher.final()]);
}

SignUp(pass)
{
    console.log(pass);

    var pair = ec.genKeyPair(); 

    text = pair.getPrivate.toString('hex');

    const key = crypto.scryptSync(pass, 'baethrowssalt', 32);

    console.log(`The key is:${key}`); 

    const {encrypted, authTag} = this.encrypt(text, key, iv);

    console.log('encrypted: ',encrypted.toString('hex'));

    const decrypted = this.decrypt(encrypted, key, iv, authTag);

    console.log('Decrypted:', decrypted.toString('utf-8'));

    return console.log(`Close and reopen your app to integrate your wallet securely`); 
}

当我打印出我最初尝试使用 scrypt 加密的私钥的解密结果时，它会在控制台中打印：

Decrypted: function getPrivate(enc) {
  if (enc === 'hex')
    return this.priv.toString(16, 2);
  else
    return this.priv;
}

为什么

decrypt(encrypted, key, iv, authTag) {
    const decipher = crypto.createDecipheriv(algorithm, key, iv).setAuthTag(authTag);
    console.log('this worked decrypt');
    return Buffer.concat([decipher.update(encrypted), decipher.final()]);
}

不给我解密形式的文本？另外，我怎么能得到它，因为我显然做错了什么。任何帮助真的将不胜感激。

Answer 1

这可能是因为“decrypted.toString('utf-8')”没有执行该函数，而是将其转换为字符串以显示在控制台中... 我相信您必须执行以下操作：

let decryptedResult = decrypted.toString('utf-8'); console.log('Decrypted:', decryptedResult.toString('utf-8'));

或但不确定

console.log('Decrypted:', (decrypted).toString('utf-8'));

Answer 2

解密的结果和你加密的明文一模一样！

您可以通过在加密之前在控制台中的SignUp() 中输出明文（即text 的内容）来轻松验证这一点：

var text = pair.getPrivate.toString('hex');             
console.log('Initial plaintext:', text);    // Initial plaintext: function getPrivate(enc) {...

text的内容出乎意料的原因是你根本忘了getPrivate后面的那对括号，应该是：

var text = pair.getPrivate().toString('hex'); 
console.log('Initial plaintext:', text);    // Initial plaintext: <the hex encoded private key>

然后解密提供了预期的结果。