openssl_public_decrypt

(PHP 4 >= 4.0.6, PHP 5, PHP 7)

openssl_public_decrypt — Decrypts data with public key

Description

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

openssl_public_decrypt() decrypts data that was previous encrypted via openssl_private_encrypt() and stores the result into decrypted.

You can use this function e.g. to check if the message was written by the owner of the private key.

Parameters

data
decrypted
key: key must be the public key corresponding that was used to encrypt the data.
padding: padding can be one of OPENSSL_PKCS1_PADDING, OPENSSL_NO_PADDING.

Return Values

Returns TRUE on success or FALSE on failure.

User Contributed Notes

wfredkNOSPAM at L5DevelopmentNOSPAM dot com

14 years ago


Encrypt using private key, decrypt using public key.

Use this for posting signed messages:  Anyone with access to
your public key can read it, but they can't create one with
your signature.

<?php
echo "Source: $source";
$fp=fopen("/path/to/private.key","r");
$priv_key=fread($fp,8192);
fclose($fp);
// $passphrase is required if your key is encoded (suggested)
$res = openssl_get_privatekey($priv_key,$passphrase);
/*
 * NOTE:  Here you use the returned resource value
 */
openssl_private_encrypt($source,$crypttext,$res);
echo "String crypted: $crypttext";

$fp=fopen ("/path/to/certificate.crt","r");
$pub_key=fread($fp,8192);
fclose($fp);
openssl_get_publickey($pub_key);
/*
 * NOTE:  Here you use the $pub_key value (converted, I guess)
 */
openssl_public_decrypt($crypttext,$newsource,$pub_key);
echo "String decrypt : $newsource";
?>

billnet at tiscalinet dot it