<?php /**  * 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, $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<br />'; $pre = $rsa->privEncrypt('我是老鳖'); 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IT的<br />'; $pue = $rsa->pubEncrypt('干IT的'); echo 'public encrypt:<br />' . $pue . '<br />'; $prd = $rsa->privDecrypt($pue); echo 'private decrypt:' . $prd; ?>