PHP - Function openssl_private_encrypt()

---

---

Definition and Usage

The openssl_private_encrypt() function will encrypt the data with the private key.

Description

Using function openssl_private_encrypt() the data will be encrypted and it can be decrypted using openssl_public_decrypt().

Syntax

openssl_private_encrypt ( string $data , string &$crypted , 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

Using openssl_private_encrypt() to Encrpt Data using Private Key:

<?php
   // To encrpt data
   $privkey = openssl_pkey_new();
   openssl_pkey_export_to_file($privkey, 'C:/xampp/htdocs/modules/openssl/privatekey.pem');
   $data = 'Welcome To TuorialsPoint';
   openssl_private_encrypt ($data, $crypted , file_get_contents('C:/xampp/htdocs/modules/openssl/privatekey.pem'),OPENSSL_PKCS1_PADDING);	
   echo $crypted;
?>

This will produce the following result:

Z3g[.zTJtngMP>7UkvJ@/UjRCbQGQ: NNZ#J0J CtSCpxol U'V7[#{]Fa#p_Y kRst:.Is*5YP-]^2(t0!Td}],HeUPp 9e;\hR

Example 2

To encrypt data using openssl_private_encrypt() and decrypt using openssl_public_decrypt():

<?php
   // Save Private Key
   $privkey = openssl_pkey_new();
   openssl_pkey_export_to_file($privkey, 'C:/xampp/htdocs/modules/openssl/privatekey.pem');
	
   // To encrpt data
   $data = 'Welcome To TuorialsPoint';
   $isvalid = openssl_private_encrypt ($data, $crypted , file_get_contents('C:/xampp/htdocs/modules/openssl/privatekey.pem'),OPENSSL_PKCS1_PADDING);	
   echo "Data encryption : ".$crypted;
   echo ">br/<>br/&lt";
	
   //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');
		
   if ($isvalid) {	
      openssl_public_decrypt ($crypted, $decrypted , file_get_contents('C:/xampp/htdocs/modules/openssl/publickey.pem'),OPENSSL_PKCS1_PADDING);	
      echo "Data decryption : ".$decrypted;
   }
?>

This will produce the following result:

Data encryption : kG7)xy{N3x

php_function_reference.htm