使用openssl实现rsa非对称加密算法示例

/**
* 使用openssl实现非对称加密
* @since 2010-07-08
*/
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()
{
$r = openssl_pkey_new();
openssl_pkey_export($r,$privKey);
file_put_contents($this->_keyPath . DIRECTORY_SEPARATOR . 'priv.key',$privKey);
$this->_privKey = openssl_pkey_get_public($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,$this->_pubKey);
if($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,$this->_pubKey);
if($r){
return $decrypted;
}
return null;
} public function __destruct()
{
@ fclose($this->_privKey);
@ fclose($this->_pubKey);
}}//以下是一个简单的测试demo，如果不需要请删除
$rsa = new Rsa('ssl-key');//私钥加密，公钥解密
echo 'source：我是老鳖
';
$pre = $rsa->privEncrypt('我是老鳖');
echo 'private encrypted:
' . $pre . '
';$pud = $rsa->pubDecrypt($pre);
echo 'public decrypted:' . $pud . '
';//公钥加密，私钥解密
echo 'source:干IT的
';
$pue = $rsa->pubEncrypt('干IT的');
echo 'public encrypt:
' . $pue . '
';$prd = $rsa->privDecrypt($pue);
echo 'private decrypt:' . $prd;
?>