| Current File : //opt/RZphp73/includes/doc/Crypt_RSA/examples/web_interface.php |
<?php
/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
/**
* Crypt_RSA allows to do following operations:
* - key pair generation
* - encryption and decryption
* - signing and sign validation
*
* This module requires the big_int PECL package, which is available at
* http://pecl.php.net/packages/big_int
*
* PHP versions 4 and 5
*
* LICENSE: This source file is subject to version 3.0 of the PHP license
* that is available through the world-wide-web at the following URI:
* http://www.php.net/license/3_0.txt. If you did not receive a copy of
* the PHP License and are unable to obtain it through the web, please
* send a note to license@php.net so we can mail you a copy immediately.
*
* @category Encryption
* @package Crypt_RSA
* @author Alexander Valyalkin <valyala@gmail.com>
* @copyright 2005 Alexander Valyalkin
* @license http://www.php.net/license/3_0.txt PHP License 3.0
* @version 1.0.0
* @link http://pear.php.net/package/Crypt_RSA
*/
/**
* this is a sample script, which shows the usage of Crypt_RSA package
*/
require_once 'Crypt/RSA.php';
$task = isset($_GET['task']) ? $_GET['task'] : '';
session_start();
switch ($task) {
case 'generate_key_pair' : generate_key_pair(); break;
case 'create_sign' : create_sign(); break;
case 'validate_sign' : validate_sign(); break;
case 'encrypt' : encrypt(); break;
case 'decrypt' : decrypt(); break;
}
print_layout();
exit;
/***********************************************************/
function generate_key_pair()
{
$key_length = $_POST['key_length'];
$key_pair = new Crypt_RSA_KeyPair($key_length);
check_error($key_pair);
$public_key = $key_pair->getPublicKey();
$private_key = $key_pair->getPrivateKey();
$_SESSION['public_key'] = $public_key->toString();
$_SESSION['private_key'] = $private_key->toString();
$_SESSION['enc_text'] = '';
$_SESSION['signature'] = '';
$_SESSION['is_sign_valid'] = 'undefined';
header('Location: ' . $_SERVER['PHP_SELF']);
}
function create_sign()
{
$document = $_POST['document'];
$private_key = $_POST['private_key'];
$rsa_obj = new Crypt_RSA(
array(
'private_key' => Crypt_RSA_Key::fromString($private_key),
)
);
check_error($rsa_obj);
$_SESSION['document'] = $document;
$_SESSION['private_key'] = $private_key;
$_SESSION['signature'] = $rsa_obj->createSign($document);
check_error($rsa_obj);
header('Location: ' . $_SERVER['PHP_SELF']);
}
function validate_sign()
{
$document = $_POST['document'];
$signature = $_POST['signature'];
$public_key = $_POST['public_key'];
$key = Crypt_RSA_Key::fromString($public_key);
check_error($key);
$rsa_obj = new Crypt_RSA;
check_error($rsa_obj);
$_SESSION['is_sign_valid'] = $rsa_obj->validateSign($document, $signature, $key) ? 'valid' : 'invalid';
check_error($rsa_obj);
$_SESSION['document'] = $document;
$_SESSION['public_key'] = $public_key;
$_SESSION['signature'] = $signature;
header('Location: ' . $_SERVER['PHP_SELF']);
}
function encrypt()
{
$plain_text = $_POST['plain_text'];
$public_key = $_POST['public_key'];
$key = Crypt_RSA_Key::fromString($public_key);
check_error($key);
$rsa_obj = new Crypt_RSA;
check_error($rsa_obj);
$_SESSION['plain_text'] = $plain_text;
$_SESSION['public_key'] = $public_key;
$_SESSION['enc_text'] = $rsa_obj->encrypt($plain_text, $key);
check_error($rsa_obj);
header('Location: ' . $_SERVER['PHP_SELF']);
}
function decrypt()
{
$enc_text = $_POST['enc_text'];
$private_key = $_POST['private_key'];
$key = Crypt_RSA_Key::fromString($private_key);
check_error($key);
$rsa_obj = new Crypt_RSA;
check_error($rsa_obj);
$rsa_obj->setParams(array('dec_key' => $key));
check_error($rsa_obj);
$_SESSION['plain_text'] = $rsa_obj->decrypt($enc_text);
check_error($rsa_obj);
$_SESSION['private_key'] = $private_key;
$_SESSION['enc_text'] = $enc_text;
header('Location: ' . $_SERVER['PHP_SELF']);
}
function print_layout()
{
$php_self = $_SERVER['PHP_SELF'];
$public_key = get_session_var('public_key', true);
$private_key = get_session_var('private_key', true);
$document = get_session_var('document', true);
$signature = get_session_var('signature', true);
$plain_text = get_session_var('plain_text', true);
$enc_text = get_session_var('enc_text', true);
$is_sign_valid = get_session_var('is_sign_valid', true);
echo <<<END
<html>
<head>
<title>Crypt_RSA example of usage</title>
<style type="text/css">
form { margin: 10px; padding: 10px; background: #ccc; border: 1px solid; }
textarea { margin-bottom: 10px; }
</style>
</head>
<body>
<h1>Crypt_RSA example of usage</h1>
<form action="{$php_self}?task=generate_key_pair" method="POST">
<div>
<h1>Key generation</h1>
Select key length:
<select name="key_length">
<option value="32">32 bit</option>
<option value="64">64 bit</option>
<option value="128">128 bit</option>
<option value="256">256 bit</option>
<option value="512">512 bit</option>
<option value="1024">1024 bit</option>
<option value="2048">2048 bit</option>
</select><br/>
Public key:<br/>
<textarea style="height:100px;width:90%">{$public_key}</textarea><br/>
Private key:<br/>
<textarea style="height:100px;width:90%">{$private_key}</textarea><br/>
<input type="submit" value="Start">
</div>
</form>
<form action="{$php_self}?task=create_sign" method="POST">
<div>
<h1>Signing document</h1>
Document:<br/>
<textarea style="height:100px;width:90%" name="document">{$document}</textarea><br/>
Private key:<br/>
<textarea style="height:100px;width:90%" name="private_key">{$private_key}</textarea><br/>
Signature:<br/>
<textarea style="height:100px;width:90%">{$signature}</textarea><br/>
<input type="submit" value="Sign">
</div>
</form>
<form action="{$php_self}?task=validate_sign" method="POST">
<div>
<h1>Validating document sign</h1>
Document:<br/>
<textarea style="height:100px;width:90%" name="document">{$document}</textarea><br/>
Signature:<br/>
<textarea style="height:100px;width:90%" name="signature">{$signature}</textarea><br/>
Public key:<br/>
<textarea style="height:100px;width:90%" name="public_key">{$public_key}</textarea><br/>
Result: <span style="font-size:2em">{$is_sign_valid}</span><br/>
<input type="submit" value="Validate">
</div>
</form>
<form action="{$php_self}?task=encrypt" method="POST">
<div>
<h1>Encrypting</h1>
Plain text:<br/>
<textarea style="height:100px;width:90%" name="plain_text">{$plain_text}</textarea><br/>
Public key:<br/>
<textarea style="height:100px;width:90%" name="public_key">{$public_key}</textarea><br/>
Encrypted text:<br/>
<textarea style="height:100px;width:90%">{$enc_text}</textarea><br/>
<input type="submit" value="Encrypt">
</div>
</form>
<form action="{$php_self}?task=decrypt" method="POST">
<div>
<h1>Decrypting</h1>
Encrypted text:<br/>
<textarea style="height:100px;width:90%" name="enc_text">{$enc_text}</textarea><br/>
Private key:<br/>
<textarea style="height:100px;width:90%" name="private_key">{$private_key}</textarea><br/>
Plain text:<br/>
<textarea style="height:100px;width:90%">{$plain_text}</textarea><br/>
<input type="submit" value="Decrypt">
</div>
</form>
END;
}
function get_session_var($name, $is_html_encode)
{
$value = '';
if (isset($_SESSION[$name])) {
$value = $_SESSION[$name];
}
$_SESSION[$name] = $value;
return $is_html_encode ? htmlspecialchars($value) : $value;
}
// error handler
function check_error(&$obj)
{
if ($obj->isError()) {
$error = $obj->getLastError();
switch ($error->getCode()) {
case CRYPT_RSA_ERROR_WRONG_TAIL :
// nothing to do
break;
default:
// echo error message and exit
echo 'error: ', $error->getMessage();
exit;
}
}
}
?>