Node.js cipher.getAuthTag()用法及代碼示例

cipher.getAuthTag() 方法返回一個緩衝區，其中包含根據給定數據計算出的身份驗證標簽。該方法應該在使用final方法之後調用。

Buffer 對象用於表示固定長度的字節序列。

用法:

cipher.getAuthTag()

Parameters: 該方法不接受任何參數。

返回值：此方法返回一個緩衝區，其中包含根據給定數據計算出的身份驗證標記。

示例 1：在下麵的示例中，我們將在控製台屏幕上打印緩衝區。

Javascript


const crypto = require('crypto'),
    algorithm = 'aes-256-gcm',
    password = '3zTvzr3p67VC61jmV54rIYu1545x4TlY',
    // Do not use a global iv for production, 
    // generate a new one for each encryption
    iv = '60iP0h6vJoEa'
function encrypt(text) {
    let cipher = crypto.createCipheriv(algorithm, password, iv)
    let encrypted = cipher.update(text, 'utf8', 'hex')
    encrypted += cipher.final('hex');
    let tag = cipher.getAuthTag();
    return {
        content: encrypted,
        tag: tag
    };
}
let output = encrypt("GeeksforGeeks")
//  Here, we are printing the tag and content.
// Content is Encrypted 
console.log(output);

輸出：

{
    content: '57e625f9675b265c32a86966eb',
     tag: <Buffer df e6 cc ff 9e 70 47 2e 66 4a f0 ba 08 53 17 b5>
}

示例2：在下麵的示例中，我們將在最終方法之前調用getAuthTag()方法。

Javascript


const crypto = require('crypto'),
    algorithm = 'aes-256-gcm',
    password = '3zTvzr3p67VC61jmV54rIYu1545x4TlY',
    // Do not use a global iv for production, 
    // generate a new one for each encryption
    iv = '60iP0h6vJoEa'
function encrypt(text) {
    let cipher = crypto.createCipheriv(algorithm, password, iv)
    let encrypted = cipher.update(text, 'utf8', 'hex')
    let tag = cipher.getAuthTag();
    encrypted += cipher.final('hex');
    return {
        content: encrypted,
        tag: tag
    };
}
let output = encrypt("GeeksforGeeks")
//  Here, we are printing the tag and content. 
// Content is Encrypted 
console.log(output);

輸出：在此示例中，我們將收到如下錯誤。

node:internal/crypto/cipher:213
 throw new ERR_CRYPTO_INVALID_STATE('getAuthTag');

參考： https://nodejs.org/api/crypto.html#ciphergetauthtag

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注：本文由純淨天空篩選整理自neeraj3304大神的英文原創作品 Node.js cipher.getAuthTag() 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。