Node.js cipher.update() 方法

cipher.update()方法是加密模块中 Cipher 类的内置应用程序编程接口，用于根据给定的编码格式用数据更新密码。

句法：

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

参数：此方法采用以下参数：

• 数据：用于通过新内容更新密码。
• inputEncoding：输入编码格式。
• outputEncoding：输出编码格式。

返回值：此方法返回包含密码值的缓冲区对象。

示例 1：文件名：index.js

Javascript

// Node.js program to demonstrate the
// cipher.update() method
 
// Importing crypto module
const crypto = require('crypto');
 
// Creating and initializing algorithm and password
const algorithm = 'aes-192-cbc';
const password = 'Password used to generate key';
 
// Getting key for the cipher object
const key = crypto.scryptSync(password, 'salt', 24);
 
// Creating and initializing the static iv
const iv = Buffer.alloc(16, 0);
 
// Creating and initializing the cipher object
const cipher = crypto.createCipheriv(algorithm, key, iv);
 
// Updating the cipher with the data
// by using update() method
let encrypted = cipher.update(
    'some clear text data', 'utf8', 'hex');
 
// Getting the buffer data of cipher
encrypted += cipher.final('hex');
 
// Display the result
console.log(encrypted);

输出：

e5f79c5915c02171eec6b212d5520d44480993d7d622a7c4c2da32f6efda0ffa

示例 2：文件名：index.js

Javascript

// Node.js program to demonstrate the
// cipher.update() method
 
// Importing crypto module
const crypto = require('crypto');
 
// Creating and initializing algorithm 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 initializing the static iv
        const iv = Buffer.alloc(16, 0);
 
        // Creating and initializing the cipher object
        const cipher = crypto
            .createCipheriv(algorithm, key, iv);
 
        // Updating the cipher with the data
        // by using update() method
        let encrypted = cipher.update(
            'some clear text data', 'utf8', 'hex');
 
        // Getting the buffer data of cipher 
        encrypted += cipher.final('hex');
 
        // Display the result
        console.log(encrypted);
    });

输出：

5850288b1848440f0c410400403f7b456293229b5231c17d2b83b602f252714b

使用以下命令运行 index.js 文件：

node index.js

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