Node.js x509.toLegacyObject()用法及代碼示例

x509.toLegacyObject() 是加密模塊中 X509Certificate 類的內置應用程序編程接口，用於使用舊證書對象編碼獲取有關此證書的信息。

用法:

const x509.toLegacyObject()

參數：此方法不接受任何參數作為參數。

返回值：此方法使用舊證書對象編碼返回有關此證書的信息。

如何生成公共證書？

公共證書打開記事本並使用copy-paste和以下 key 並將文件另存為public-cert.pem

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

範例1：

// Node.js program to demonstrate the  
// x509.toLegacyObject() 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 information about this certificate.
// by using x509.toLegacyObject() function
const value = x509.toLegacyObject()
  
// display the result
console.log( value.bits)

使用以下命令運行index.js文件。

node index.js

輸出：

1024

範例2：

// Node.js program to demonstrate the  
// x509.toLegacyObject() function
  
// Importing crypto module
const {X509Certificate} = require('crypto')
  
// Importing fs module
const fs = require('fs')
  
// display the result
console.log(((new X509Certificate(fs.readFileSync
         ('public-cert.pem'))).toLegacyObject()).exponent)

使用以下命令運行index.js文件。

node index.js

輸出：

0x10001

參考：https://nodejs.org/dist/latest-v15.x/docs/api/crypto.html#crypto_x509_tolegacyobject