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PHP - Function openssl_public_encrypt()


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Definition and Usage

The openssl_public_encrypt() function will encrypt the data with public key.

Description

Using function openssl_public_encrypt() the data will be encrypted and it can be decrypted using openssl_private_decrypt().

Syntax

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

Parameters

Sr.No Parameter Description
1

data

.

2

encrypted

It will have the data that is encrypted.

3

key

The public key.

4

padding

The padding you can apply are : OPENSSL_PKCS1_PADDING, OPENSSL_SSLV23_PADDING, OPENSSL_PKCS1_OAEP_PADDING, OPENSSL_NO_PADDING.

Return Values

PHP openssl_public_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_public_encrypt() to Encrpt Data using Public Key:

<?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;
?>

This will produce the following result:

Data encryption : ��E �wC�ݭ�+c��f*��o���W�7�EW��$�p�.rng�_N��A1��2Uݴ~s�ap۳)w��=� ��#��g;���u��_%�Z�bb�&��m��v&����q��k

Example 2

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/<";
	
   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 the following result:

Data encryption : L�_}{�E*?��9[w��7p �\ϸI�?ݟ'��ݹ�n��!��ɿ�*��Xcw���Ւ�)��/��{��!j�L��I*Ï"9eV�9�=Y\�m�i䁦�M(�0PJ��Ԇ�9��C�`�a�ݧ�b��a��?�m�G$i��eU/[�eU����\=�zLdŌn"��:[\�UA��ԭ�ힲ2@-"d��s�=2�nˣ�h��q5U��浿��9�{ݼ��|�NE�a!

Data decryption : Welcome To TuorialsPoint
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