PHP实现非对称加密

非对称加密

至于什么是非对称加密，这里就不说啦，大家谷歌去吧。这里说明的是，最近在做一个对外的充值加密服务，那么涉及到这个加密的处理，中间遇到几个小问题，所以记录下，方便自己下次查阅。

<?php/** * 使用openssl实现非对称加密 *  * @since 2015-11-10 */class Rsa{    /**     * 私钥     *      */    private $_privKey;    /**     * 公钥     *      */    private $_pubKey;    /**     * 保存文件地址     */    private $_keyPath;    /**     * 指定密钥文件地址     *      */    public function __construct($path)    {        if (empty($path) || !is_dir($path)) {            throw new Exception('请指定密钥文件地址目录');        }        $this->_keyPath = $path;    }    /**     * 创建公钥和私钥     *      */    public function createKey()    {        $config = [            "config" => 'D:\wamp\bin\apache\apache2.4.9\conf\openssl.cnf',            "digest_alg" => "sha512",            "private_key_bits" => 4096,            "private_key_type" => OPENSSL_KEYTYPE_RSA,        ];        // 生成私钥        $rsa = openssl_pkey_new($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);        // 生成公钥        $rsaPri = openssl_pkey_get_details($r);        $pubKey = $rsaPri['key'];        file_put_contents($this->_keyPath . DIRECTORY_SEPARATOR . 'pub.key', $pubKey);        $this->_pubKey = openssl_pkey_get_public($pubKey);    }    /**     * 设置私钥     *      */    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;    }    /**     * 设置公钥     *      */    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;    }    /**     * 用私钥加密     *      */    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($encrypted);        }        return null;    }    /**     * 私钥解密     *      */    public function privDecrypt($encrypted)    {        if (!is_string($encrypted)) {            return null;        }        $this->setupPrivKey();        $encrypted = base64_decode($encrypted);        $result = openssl_private_decrypt($encrypted, $decrypted, $this->_privKey);        if ($result) {            return $decrypted;        }        return null;    }    /**     * 公钥加密     *      */    public function pubEncrypt($data)    {        if (!is_string($data)) {            return null;        }        $this->setupPubKey();        $result = openssl_public_encrypt($data, $encrypted, $this->_pubKey);        if ($result) {            return base64_encode($encrypted);        }        return null;    }    /**     * 公钥解密     *      */    public function pubDecrypt($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);    }}?> 

$rsa = new Rsa('ssl-key');//私钥加密，公钥解密echo "待加密数据：segmentfault.com\n";$pre = $rsa->privEncrypt("segmentfault.com");echo "加密后的密文:\n" . $pre . "\n";$pud = $rsa->pubDecrypt($pre);echo "解密后数据:" . $pud . "\n";//公钥加密，私钥解密echo "待加密数据：segmentfault.com\n";$pue = $rsa->pubEncrypt("segmentfault.com");echo "加密后的密文:\n" . $pue . "\n";$prd = $rsa->privDecrypt($pue);echo "解密后数据:" . $prd;

这里特别要注意的是在配置中要指定openssl.cnf的文件地址，或者设置个OPENSSL_CONF全局变量就可以了。