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Legal StudiesNode.js 中的 cipher.final() 方法
cipher.final() 用來返回一個 buffer 或者包含 cipher 物件值的字串。它是加密模組的 Cipher 類中提供的內建方法之一。如果指定了輸出編碼，則會返回一個 String。如果未指定輸出編碼，則會返回一個 buffer。多次呼叫 cipher.final 方法會引發錯誤。
語法
cipher.final([outputEncoding])
引數
以上引數說明如下 −
outputEncoding – 它將輸出編碼作為引數。此引數的輸入型別為字串。可能的輸入值有 hex、base64 等。
示例
建立一個名為 cipherFinal.js 的檔案，並複製以下程式碼片段。建立檔案後，使用以下命令執行此程式碼，如下面的示例所示 −
node cipherFinal.js
cipherFinal.js
// Example to demonstrate the use of cipher.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 = '12345678';
// Retrieving key for the cipher object
const key = crypto.scryptSync(password, 'salt', 24);
// Initializing the static iv
const iv = Buffer.alloc(16, 0);
// Initializing the cipher object to get cipher
const cipher = crypto.createCipheriv(algorithm, key, iv);
const cipher2 = crypto.createCipheriv(algorithm, key, iv);
//Getting the string value as outputEncoding is defined
let hexValue = cipher.final('hex');
let base64Value = cipher2.final('base64');
// Printing the result...
console.log("Hex String:- " + hexValue);
console.log("Base64 String:- " + base64Value)輸出
C:\home
ode>> node cipherFinal.js Hex String:- 8d11772fce59f08e7558db5bf17b3112 Base64 String:- jRF3L85Z8I51WNtb8XsxEg==
示例
我們再來看看另一個示例。
// Example to demonstrate the use of cipher.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 = '12345678';
// Retrieving key for the cipher object
const key = crypto.scryptSync(password, 'salt', 24);
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 cipher object to get cipher
const cipher = crypto.createCipheriv(algorithm, key, iv);
//Getting the buffer value since output encoding is null
let hexValue = cipher.final();
let base64Value = cipher.final('base64');
// Printing the result...
console.log("Buffer:- " + hexValue);
console.log("Base64 String:- " + base64Value)
});輸出
C:\home
ode>> node cipherFinal.js internal/crypto/cipher.js:164 const ret = this._handle.final(); ^ Error: Unsupported state at Cipheriv.final (internal/crypto/cipher.js:164:28) at Object. (/home/node/test/cipher.js:22:26) at Module._compile (internal/modules/cjs/loader.js:778:30) at Object.Module._extensions..js (internal/modules/cjs/loader.js:789:10) at Module.load (internal/modules/cjs/loader.js:653:32) at tryModuleLoad (internal/modules/cjs/loader.js:593:12) at Function.Module._load (internal/modules/cjs/loader.js:585:3) at Function.Module.runMain (internal/modules/cjs/loader.js:831:12) at startup (internal/bootstrap/node.js:283:19) at bootstrapNodeJSCore (internal/bootstrap/node.js:623:3)
在上述示例中，我們遇到了錯誤，因為我們已經獲得了該金鑰的密碼。因為這是一個最終方法，所以當我們嘗試再次查詢同一金鑰的密碼時，它會出錯。
更新於: 2021 年 5 月 20 日
605 次瀏覽
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