PHP - openssl_pkey_get_public() 函式

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定義和用法

openssl_pkey_get_public() 函式將返回公鑰。

描述

openssl_pkey_get_public() 函式從給定的證書中返回公鑰，以便與其他函式一起使用。

語法

openssl_pkey_get_public ( mixed $certificate ) : resource

引數

返回值

如果 PHP openssl_pkey_get_public() 函式沒有錯誤，則返回一個正的資源識別符號。如果失敗，則返回 false。

PHP 版本

此函式適用於 PHP 5.0.0 以上版本。

示例 1

openssl_pkey_get_public() 與 X.509 證書配合使用：

<?php
   $dn = array(
      "countryName" => "IN",
      "stateOrProvinceName" => "Karnataka",
      "localityName" => "test1",
      "organizationName" => "test2",
      "organizationalUnitName" => "test3",
      "commonName" => "www.test.com",
      "emailAddress" => "xyz@test.com"
   );

   // Generate a new private /public key pair
   $privkey = openssl_pkey_new();

   // Generate a certificate
   $csr = openssl_csr_new($dn, $privkey, array('digest_alg' => 'sha256'));
   $res_cert = openssl_csr_sign($csr, null, $privkey, 365);
   openssl_x509_export($res_cert, $x_509_certificate);
   echo $res_pubkey = openssl_pkey_get_public($x_509_certificate);
?>

這將產生以下結果：

Resource id #5

示例 2

使用 .pem 檔案的 openssl_pkey_get_public()：

<?php
   $dn = array(
      "countryName" => "IN",
      "stateOrProvinceName" => "Karnataka",
      "localityName" => "test1",
      "organizationName" => "test2",
      "organizationalUnitName" => "test3",
      "commonName" => "www.test.com",
      "emailAddress" => "xyz@test.com"
   );

   // Generate a new private /public key pair
   $privkey = openssl_pkey_new();

   // Generate a certificate
   $csr = openssl_csr_new($dn, $privkey, array('digest_alg' => 'sha256'));
   $res_cert = openssl_csr_sign($csr, null, $privkey, 365);
   openssl_x509_export_to_file($res_cert, 'C:/xampp/htdocs/modules/openssl/x_509.pem');
   echo $res_pubkey = openssl_pkey_get_public(file_get_contents('C:/xampp/htdocs/modules/openssl/x_509.pem'));
?>

這將產生以下結果：

Resource id #7