后端开发|php教程
openssl,rsa,非对称加密算法
后端开发-php教程
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<?php
/**
* 使用openssl实现非对称加密
* @since -07-08
*/
class Rsa
{
/**
* private key
*/
private $_privKey;
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/**
* public key
*/
private $_pubKey;
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/**
* 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, $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);
}
}
//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;
?>
需要注意的是apache要支持OpenSSL
