這篇文章主要介紹了使用openssl實現rsa非對稱加密算法的示例，大家參考使用吧
代碼如下: <?php /** * 使用openssl實現非對稱加密 * @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); } } //以下是一個簡單的測試demo，如果不需要請刪除 $rsa = new Rsa('ssl-key'); //私鑰加密，公鑰解密 echo 'source：我是老鱉<br />'; $pre = $rsa->privEncrypt('我是老鱉'); echo 'private encrypted:<br />' . $pre . '<br />'; $pud = $rsa->pubDecrypt($pre); echo 'public decrypted:' . $pud . '<br />'; //公鑰加密，私鑰解密 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; ?> 需要注意的是apache要支持OpenSSL
