decipher.update()用於根據給定的編碼格式用接收到的資料更新解密。它是 crypto 模組中的 Decipher 類別提供的內建方法之一。如果指定了輸入編碼，則資料參數是字串，否則資料參數是緩衝區
decipher.update(data, [inputEncoding], [outputEncoding])
#以上參數描述如下-
data – 它需要資料作為傳遞以更新解密內容的輸入。
inputEncoding - 它將輸入編碼作為參數。可能的輸入值為十六進位、base64 等。
outputEncoding – 它將輸出編碼作為參數。此參數的輸入類型是字串。可能的輸入值為十六進位、base64 等。
建立一個名為 decipherUpdate.js 的檔案並複製以下程式碼片段。建立檔案後，使用以下指令執行此程式碼，如下例所示-
node decipherUpdate.js
decipherUpdate.js
// Example to demonstrate the use of decipher.final() method
// Importing the crypto module
const crypto = require('crypto');
// Initialising the AES algorithm
const algorithm = 'aes-192-cbc';
// Initialising the password used for generating key
const password = '12345678123456789';
// Retrieving key for the decipher object
const key = crypto.scryptSync(password, 'old data', 24);
// Initializing the static iv
const iv = Buffer.alloc(16, 0);
const decipher = crypto.createDecipheriv(algorithm, key, iv);
// Initializing the decipher object to get decipher
const encrypted = '083bfe1b2f91677e5d00add115be2f1b2e362e190406f5c6b60e86969bf03bff';
// const encrypted2 = '8d11772fce59f08e7558db5bf17b3112';
let decryptedValue = decipher.update(encrypted, 'hex', 'utf8');
// let decryptedValue1 = decipher.update(encrypted1, 'hex', 'utf8');
decryptedValue += decipher.final('utf8');
// Printing the result...
console.log("Decrypted value -- " + decryptedValue);
// console.log("Base64 String:- " + base64Value)C:\homeode>> node decipherUpdate.js Decrypted value -- Some new text data
讓我們再看一個範例。
// Example to demonstrate the use of decipher.final() method
// Importing the crypto module
const crypto = require('crypto');
// Initialising the AES algorithm
const algorithm = 'aes-192-cbc';
// Initialising the password used for generating key
const password = '12345678123456789';
// Retrieving key for the decipher object
crypto.scrypt(password, 'salt', 24,
{ N: 512 }, (err, key) => {
if (err) throw err;
// Initializing the static iv
const iv = Buffer.alloc(16, 0);
// Initializing the decipher with algo, key and iv
const decipher = crypto.createDecipheriv(algorithm, key, iv);
const encrypted = '91d6d37e70fbae537715f0a921d15152194435b96ce3973d92fbbc4a82071074';
//Getting the decrypted string value
const decrypted = decipher.update(encrypted, 'hex', 'utf8');
// Printing the result...
console.log("Decrypted value:- " + decrypted);
});C:\homeode>> node decipherUpdate.js Decrypted value:- Some new text data
以上是Node.js 中的 decipher.update() 方法的詳細內容。更多資訊請關注PHP中文網其他相關文章！
