PHP - Function openssl_private_decrypt()

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Definition and Usage

The openssl_private_decrypt() function will decrypt the data with the private key.

Description

Using function openssl_private_decrypt() will decrypt the data that is ecrypted using openssl_private_encrypt().

Syntax

openssl_private_decrypt ( string $data , string &$decrypted , mixed $key [, int $padding = OPENSSL_PKCS1_PADDING ] ) : bool

Parameters

Return Values

PHP openssl_private_encrypt() function returns TRUE on success or FALSE on failure.

PHP Version

This function will work from PHP Version greater than 5.0.0.

Example 1

To encrypt data using openssl_public_encrypt() and decrypt using openssl_private_decrypt():

<?php
   // Save Private Key
   $privkey = openssl_pkey_new();
   openssl_pkey_export_to_file($privkey, 'C:/xampp/htdocs/modules/openssl/privatekey.pem');
	
   //Save Public Key
   $dn = array(
      "countryName" => "IN",
      "stateOrProvinceName" => "Karnataka",
      "localityName" => "test1",
      "organizationName" => "test2",
      "organizationalUnitName" => "test3",
      "commonName" => "www.test.com",
      "emailAddress" => "xyz@test.com"
   );
   $cert = openssl_csr_new($dn, $privkey);
   $cert = openssl_csr_sign($cert, null, $privkey, 365);
   openssl_x509_export_to_file($cert, 'C:/xampp/htdocs/modules/openssl/publickey.pem');
	
	
   // To encrpt data
   $data = 'Welcome To TuorialsPoint';
   $isvalid = openssl_public_encrypt ($data, $crypted , file_get_contents('C:/xampp/htdocs/modules/openssl/publickey.pem'),OPENSSL_PKCS1_PADDING);	
   echo "Data encryption : ".$crypted;
   echo ">br/<>br/&lt";
	
   if ($isvalid) {	
      openssl_private_decrypt ($crypted, $decrypted , file_get_contents('C:/xampp/htdocs/modules/openssl/privatekey.pem'),OPENSSL_PKCS1_PADDING);	
      echo "Data decryption : ".$decrypted;
   }
?>

This will produce following result:

Data encryption : L_}{E*?9[w7p \I?'n!*Xcw)/{!jLI*"9eV9=Y\miM(0PJ9C`aba?mG$ieU/[eU\=zLdn":[\UA2@-"ds=2nhq5U9{|NEa!

Data decryption : Welcome To TuorialsPoint

Example 2

To encrypt file contents using openssl_public_encrypt() and decrypt using openssl_private_decrypt():

<?php
   // Save Private Key
   $privkey = openssl_pkey_new();
   openssl_pkey_export_to_file($privkey, 'C:/xampp/htdocs/modules/openssl/privatekey.pem');
	
   //Save Public Key
   $dn = array(
      "countryName" => "IN",
      "stateOrProvinceName" => "Karnataka",
      "localityName" => "test1",
      "organizationName" => "test2",
      "organizationalUnitName" => "test3",
      "commonName" => "www.test.com",
      "emailAddress" => "xyz@test.com"
   );
   $cert = openssl_csr_new($dn, $privkey);
   $cert = openssl_csr_sign($cert, null, $privkey, 365);
   openssl_x509_export_to_file($cert, 'C:/xampp/htdocs/modules/openssl/publickey.pem');
	
	
   // To encrpt data
   $data = file_get_contents('C:/xampp/htdocs/modules/openssl/test.txt'); // save any data in file test.txt;
   $isvalid = openssl_public_encrypt ($data, $crypted , file_get_contents('C:/xampp/htdocs/modules/openssl/publickey.pem'),OPENSSL_PKCS1_PADDING);	
   echo "Data encryption : ".$crypted;
   echo ">br/<>br/&lt";
	
   if ($isvalid) {	
      openssl_private_decrypt ($crypted, $decrypted , file_get_contents('C:/xampp/htdocs/modules/openssl/privatekey.pem'),OPENSSL_PKCS1_PADDING);	
      echo "Data decryption : ".$decrypted;
   }
?>

This will produce following result:

Data encryption : 1Ac`xij&!$zi*:)Wai|tum3S`BfFqu rZ2XlP7{ v3(5RdC6]X`[2{dbPYHz *ZXRRWG*.>|f#]K@'hp7Tm&BeRcuY- 

Data decryption : This is data encryption test using openssl php module.