Node.js x509.validFrom用法及代码示例

x509.validFrom 是加密模块中 X509Certificate 类的内置应用程序编程接口，用于获取该证书被视为有效的日期/时间。

用法:

const x509.validFrom

参数：此函数不接受任何参数作为参数。

返回值：此函数返回认为此证书有效的日期/时间。

如何生成公共证书？

公用证书：打开记事本并使用copy-paste和以下 key 并将文件另存为public-cert.pem

-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

范例1：

// Node.js program to demonstrate the  
// x509.validFrom function
  
// Importing crypto module
const {X509Certificate} = require('crypto')
  
// Importing fs module
const fs = require('fs')
  
// getting object of a PEM encoded X509 Certificate. 
const x509 = new X509Certificate(fs.readFileSync('public-cert.pem'));
  
// getting date of creation of this certificate.
// by using x509.validFrom function
const value = x509.validFrom
  
// display the result
console.log( value)

使用以下命令运行index.js文件。

node index.js

输出：

Sep  9 05:51:17 2020 GMT

范例2：

// Node.js program to demonstrate the  
// x509.validFrom function
  
// Importing crypto module
const {X509Certificate} = require('crypto')
  
// Importing fs module
const fs = require('fs')
  
// display the result
console.log("date of creation:- " 
             + (new X509Certificate
           (fs.readFileSync('public-cert.pem'))).validFrom)

使用以下命令运行index.js文件。

node index.js

输出：

date of creation:- Sep  9 05:51:17 2020 GMT

参考：https://nodejs.org/dist/latest-v15.x/docs/api/crypto.html#crypto_x509_validfrom