使用openssl实现rsa非对称加密算法示例

<?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;?>