<?php
/**
* 使用openssl实现非对称加密
*
* @author
*/
class Rsa
{
/**
* private key
*/
private $_privKey;
/**
* public key
*/
private $_pubKey;
/**
* the keys saving path
*/
private $_keyPath;
/**
* the construtor,the param $path is the keys saving path
*/
public function __construct($path)
{
if(empty($path) || !is_dir($path)){
throw new Exception('Must set the keys save path');
}
$this->_keyPath = $path;
}
/**
* create the key pair,save the key to $this->_keyPath
*/
public function createKey()
{
$configargs = array('digest_alg' => 'sha1',
'private_key_type' => OPENSSL_KEYTYPE_RSA,
'private_key_bits' => 512,
"config" => "E:/xampp/php/extras/openssl/openssl.cnf"
);
$r = openssl_pkey_new($configargs);
openssl_pkey_export($r, $privKey,null,$configargs);
file_put_contents($this->_keyPath . DIRECTORY_SEPARATOR . 'priv.key', $privKey);
$this->_privKey = openssl_pkey_get_private($privKey);
$rp = openssl_pkey_get_details($r);
$pubKey = $rp['key'];
file_put_contents($this->_keyPath . DIRECTORY_SEPARATOR . 'pub.key', $pubKey);
$this->_pubKey = openssl_pkey_get_public($pubKey);
}
/**
* setup the private key
*/
public function setupPrivKey()
{
if(is_resource($this->_privKey)){
return true;
}
$file = $this->_keyPath . DIRECTORY_SEPARATOR . 'priv.key';
$prk = file_get_contents($file);
$this->_privKey = openssl_pkey_get_private($prk);
return true;
}
/**
* setup the public key
*/
public function setupPubKey()
{
if(is_resource($this->_pubKey)){
return true;
}
$file = $this->_keyPath . DIRECTORY_SEPARATOR . 'pub.key';
$puk = file_get_contents($file);
$this->_pubKey = openssl_pkey_get_public($puk);
return true;
}
/**
* encrypt with the private key
*/
public function privEncrypt($data)
{
if(!is_string($data)){
return null;
}
$this->setupPrivKey();
$r = openssl_private_encrypt($data, $encrypted, $this->_privKey);
if($r){
return base64_encode($encrypted);
}
return null;
}
/**
* decrypt with the private key
*/
public function privDecrypt($encrypted)
{
if(!is_string($encrypted)){
return null;
}
$this->setupPrivKey();
$encrypted = base64_decode($encrypted);
$r = openssl_private_decrypt($encrypted, $decrypted, $this->_privKey);
if($r){
return $decrypted;
}
return null;
}
/**
* encrypt with public key
*/
public function pubEncrypt($data)
{
if(!is_string($data)){
return null;
}
$this->setupPubKey();
$r = openssl_public_encrypt($data, $encrypted, $this->_pubKey);
if($r){
return base64_encode($encrypted);
}
return null;
}
/**
* decrypt with the public key
*/
public function pubDecrypt($crypted)
{
if(!is_string($crypted)){
return null;
}
$this->setupPubKey();
$crypted = base64_decode($crypted);
$r = openssl_public_decrypt($crypted, $decrypted, $this->_pubKey);
if($r){
return $decrypted;
}
return null;
}
public function __destruct()
{
@ fclose($this->_privKey);
@ fclose($this->_pubKey);
}
}
//====================demo=======================
//以下是一个简单的测试demo，如果不需要请删除
$rsa = new Rsa('ssl-key');
$rsa->createKey(); //创建一对密钥，如果密钥对已经存在，不需调用
//私钥加密，公钥解密
echo 'source：就将计就计<br />';
$pre = $rsa->privEncrypt('就将计就计');
echo 'private encrypted:<br />' . $pre . '<br />';
$pud = $rsa->pubDecrypt($pre);
echo 'public decrypted:' . $pud . '<br />';
//公钥加密，私钥解密
echo 'source:干反方向<br />';
$pue = $rsa->pubEncrypt('干反方向');
echo 'public encrypt:<br />' . $pue . '<br />';
$prd = $rsa->privDecrypt($pue);
echo 'private decrypt:' . $prd;
//========================demo======================
//特别注意：没有openssl.cnf配置，在创建 public/private key 的时候会出现类似以下的问题
//Warning: openssl_pkey_export() [function.openssl-pkey-export]: cannot get key from parameter,
//或者openssl_pkey_export里的私钥生成不了。
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