Node.js KeyObject.from()方法

原文:https://www . geesforgeks . org/node-js-key object-from-method/

keyObject.form() 方法是加密模块中类 keyObject 的内置应用编程接口，用于转换 keyObject 中的加密密钥实例。它是 KeyObject 类的静态方法。

语法:

keyObject.form( key ) 

参数:该方法只取一个参数描述如下。

• Key: This parameter holds the key value of the password.

返回值:该方法将实例返回给 KeyObject。

示例:

文件名:index . js

【JavaScript】

// Node.js program to demonstrate the
// keyObject.form() method

// Importing the crypto module
const { webcrypto: { subtle }, KeyObject }
    = require('crypto');

// Generating the crypto key that is
// not a keyObject instance
(async function () {
    const key = await subtle.generateKey({
        name: 'HMAC',
        hash: 'SHA-256',
        length: 256
    }, true, ['sign', 'verify']);

    try {

        // Calling keyObject.form() method to
        // get the instance to keyObject
        const keyObject = KeyObject.from(key);
        console.log("Successfully converted a "
        + "cryptoKey to instance of keyObject");
    }
    catch (error) {
        console.log("Error has been occured");
    }
})();

使用以下命令运行 index.js 文件:

node index.js

输出:

Successfully converted a cryptoKey to instance of keyObject.

参考:https://nodejs . org/API/crypto . html # crypt _ class _ key object

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