php實(shí)現(xiàn)不對(duì)稱(chēng)加密的方法：首先創(chuàng)建一個(gè)PHP示例文件；然后使用openssl實(shí)現(xiàn)非對(duì)稱(chēng)加密；最后通過(guò)“$rsa = new Rsa('ssl-key');”進(jìn)行測(cè)試即可。

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PHP實(shí)現(xiàn)非對(duì)稱(chēng)加密

至于什么是非對(duì)稱(chēng)加密，這里就不說(shuō)啦，大家谷歌去吧。這里說(shuō)明的是，最近在做一個(gè)對(duì)外的充值加密服務(wù)，那么涉及到這個(gè)加密的處理，中間遇到幾個(gè)小問(wèn)題，所以記錄下，方便自己下次查閱。

詳細(xì)代碼

<?php /**  * 使用openssl實(shí)現(xiàn)非對(duì)稱(chēng)加密  *   * @since 2015-11-10  */ class Rsa {     /**      * 私鑰      *       */     private $_privKey;     /**      * 公鑰      *       */     private $_pubKey;     /**      * 保存文件地址      */     private $_keyPath;     /**      * 指定密鑰文件地址      *       */     public function __construct($path)     {         if (empty($path) || !is_dir($path)) {             throw new Exception('請(qǐng)指定密鑰文件地址目錄');         }         $this->_keyPath = $path;     }     /**      * 創(chuàng)建公鑰和私鑰      *       */     public function createKey()     {         $config = [             "config" => 'D:wampbinapacheapache2.4.9confopenssl.cnf',             "digest_alg" => "sha512",             "private_key_bits" => 4096,             "private_key_type" => OPENSSL_KEYTYPE_RSA,         ];         // 生成私鑰         $rsa = openssl_pkey_new($config);         openssl_pkey_export($rsa, $privKey, NULL, $config);         file_put_contents($this->_keyPath . DIRECTORY_SEPARATOR . 'priv.key', $privKey);         $this->_privKey = openssl_pkey_get_public($privKey);         // 生成公鑰         $rsaPri = openssl_pkey_get_details($rsa);         $pubKey = $rsaPri['key'];         file_put_contents($this->_keyPath . DIRECTORY_SEPARATOR . 'pub.key', $pubKey);         $this->_pubKey = openssl_pkey_get_public($pubKey);     }     /**      * 設(shè)置私鑰      *       */     public function setupPrivKey()     {         if (is_resource($this->_privKey)) {             return true;         }         $file = $this->_keyPath . DIRECTORY_SEPARATOR . 'priv.key';         $privKey = file_get_contents($file);         $this->_privKey = openssl_pkey_get_private($privKey);         return true;     }     /**      * 設(shè)置公鑰      *       */     public function setupPubKey()     {         if (is_resource($this->_pubKey)) {             return true;         }         $file = $this->_keyPath . DIRECTORY_SEPARATOR . 'pub.key';         $pubKey = file_get_contents($file);         $this->_pubKey = openssl_pkey_get_public($pubKey);         return true;     }     /**      * 用私鑰加密      *       */     public function privEncrypt($data)     {         if (!is_string($data)) {             return null;         }         $this->setupPrivKey();         $result = openssl_private_encrypt($data, $encrypted, $this->_privKey);         if ($result) {             return base64_encode($encrypted);         }         return null;     }     /**      * 私鑰解密      *       */     public function privDecrypt($encrypted)     {         if (!is_string($encrypted)) {             return null;         }         $this->setupPrivKey();         $encrypted = base64_decode($encrypted);         $result = openssl_private_decrypt($encrypted, $decrypted, $this->_privKey);         if ($result) {             return $decrypted;         }         return null;     }     /**      * 公鑰加密      *       */     public function pubEncrypt($data)     {         if (!is_string($data)) {             return null;         }         $this->setupPubKey();         $result = openssl_public_encrypt($data, $encrypted, $this->_pubKey);         if ($result) {             return base64_encode($encrypted);         }         return null;     }     /**      * 公鑰解密      *       */     public function pubDecrypt($crypted)     {         if (!is_string($crypted)) {             return null;         }         $this->setupPubKey();         $crypted = base64_decode($crypted);         $result = openssl_public_decrypt($crypted, $decrypted, $this->_pubKey);         if ($result) {             return $decrypted;         }         return null;     }     /**      * __destruct      *       */     public function __destruct() {         @fclose($this->_privKey);         @fclose($this->_pubKey);     } } ?>

測(cè)試

$rsa = new Rsa('ssl-key'); //私鑰加密，公鑰解密 echo "待加密數(shù)據(jù)：segmentfault.comn"; $pre = $rsa->privEncrypt("segmentfault.com"); echo "加密后的密文:n" . $pre . "n"; $pud = $rsa->pubDecrypt($pre); echo "解密后數(shù)據(jù):" . $pud . "n"; //公鑰加密，私鑰解密 echo "待加密數(shù)據(jù)：segmentfault.comn"; $pue = $rsa->pubEncrypt("segmentfault.com"); echo "加密后的密文:n" . $pue . "n"; $prd = $rsa->privDecrypt($pue); echo "解密后數(shù)據(jù):" . $prd;

重要問(wèn)題

這里特別要注意的是在配置中要指定openssl.cnf的文件地址，或者設(shè)置個(gè)OPENSSL_CONF全局變量就可以了。