//====================demo=======================//以下是一个简单的测试demo，如果不需要请删除$rsa = new Rsa('sslkey'); //sslkey为存放密钥的路径，将已有的密钥文件复制到该路径下，公钥名称为pub.key，私钥名称为priv.key$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：我<br />';$pre = $rsa->privEncrypt('我');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;//========================demo======================

<?php/** * 使用openssl实现非对称加密 * */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);        $this->_privKey = openssl_pkey_get_private($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);    }}