Node.js decipher.update()用法及代碼示例

decipher.update()方法是加密模塊中的Decipher類的內置應用程序編程接口，用於根據給定的編碼格式用數據更新解密器。

用法:

const dicipher.update(data[, inputEncoding][, outputEncoding])

參數：此方法采用以下參數：

data:它用於通過新內容更新解密。
inputEncoding:輸入編碼格式。
outputEncoding:輸出編碼格式。

返回值：此方法不返回任何值。

範例1： 文件名：index.js

Javascript

// Node.js program to demonstrate the 
// decipher.update() method 
  
// importing crypto module 
const crypto = require('crypto'); 
  
// Creating and initializng algorith and password 
const algorithm = 'aes-192-cbc'; 
const password = 'Password used to generate key'; 
  
// Getting key for the decipher object 
const key = crypto.scryptSync(password, 'salt', 24); 
  
// Creating and initializg the static iv 
const iv = Buffer.alloc(16, 0); 
  
// Creating and initializng the decipher object 
const decipher = crypto.createDecipheriv(algorithm, key, iv); 
  
// Encrypted using same algorithm, key and iv. 
const encrypted = 
'e5f79c5915c02171eec6b212d5520d44480993d7d622a7c4c2da32f6efda0ffa'; 
  
// Updating the data into decipher object 
let decrypted = decipher.update(encrypted, 'hex', 'utf8'); 
  
// Getting decrypted data 
decrypted += decipher.final('utf8'); 
  
// Display the result 
console.log("buffer:- " + decrypted);

輸出：

buffer:- some clear text data

範例2： 文件名：index.js

Javascript

// Node.js program to demonstrate the 
// decipher.update() method 
  
// Importing crypto module 
const crypto = require('crypto'); 
  
// Creating and initializng algorith and password 
const algorithm = 'aes-192-cbc'; 
const password = 'Password used to generate key'; 
  
// Getting key for cipher object 
crypto.scrypt(password, 'salt', 24, 
  
    { N:512 }, (err, key) => { 
  
        if (err) throw err; 
  
        // Creating and initializg the static iv 
        const iv = Buffer.alloc(16, 0); 
  
        // Creating and initializng the decipher object 
        const decipher = crypto 
            .createDecipheriv(algorithm, key, iv); 
  
  
        // Encrypted using same algorithm, key and iv. 
        const encrypted = 
'e5f79c5915c02171eec6b212d5520d44480993d7d622a7c4c2da32f6efda0ffa'; 
  
        // updating the data into decipher object 
        const decrypted = decipher.update(encrypted, 'hex', 'utf8'); 
  
        console.log("buffer:- " + decipher); 
    });

輸出：

buffer:- [object Object]

使用以下命令運行index.js文件：

node index.js

參考： https://nodejs.org/dist/latest-v12.x/docs/api/crypto.html#crypto_decipher_update_data_inputencoding_outputencoding

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注：本文由純淨天空篩選整理自RohitPrasad3大神的英文原創作品 Node.js decipher.update() Method。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。