通过openssl实现的签名、验签、非对称加解密,需要配合x.509证书(如crt和pem)文件使用。
-
/**
- * RSA算法类
- * 签名及密文编码:base64字符串/十六进制字符串/二进制字符串流
- * 填充方式: PKCS1Padding(加解密)/NOPadding(解密)
- *
- * Notice:Only accepts a single block. Block size is equal to the RSA key size!
- * 如密钥长度为1024 bit,则加密时数据需小于128字节,加上PKCS1Padding本身的11字节信息,所以明文需小于117字节
- *
- * @author: linvo
- * @version: 1.0.0
- * @date: 2013/1/23
- */
- class RSA{
-
- private $pubKey = null;
- private $priKey = null;
-
- /**
- * 自定义错误处理
- */
- private function _error($msg){
- die('RSA Error:' . $msg); //TODO
- }
-
- /**
- * 构造函数
- *
- * @param string 公钥文件(验签和加密时传入)
- * @param string 私钥文件(签名和解密时传入)
- */
- public function __construct($public_key_file = '', $private_key_file = ''){
- if ($public_key_file){
- $this->_getPublicKey($public_key_file);
- }
- if ($private_key_file){
- $this->_getPrivateKey($private_key_file);
- }
- }
-
-
- /**
- * 生成签名
- *
- * @param string 签名材料
- * @param string 签名编码(base64/hex/bin)
- * @return 签名值
- */
- public function sign($data, $code = 'base64'){
- $ret = false;
- if (openssl_sign($data, $ret, $this->priKey)){
- $ret = $this->_encode($ret, $code);
- }
- return $ret;
- }
-
- /**
- * 验证签名
- *
- * @param string 签名材料
- * @param string 签名值
- * @param string 签名编码(base64/hex/bin)
- * @return bool
- */
- public function verify($data, $sign, $code = 'base64'){
- $ret = false;
- $sign = $this->_decode($sign, $code);
- if ($sign !== false) {
- switch (openssl_verify($data, $sign, $this->pubKey)){
- case 1: $ret = true; break;
- case 0:
- case -1:
- default: $ret = false;
- }
- }
- return $ret;
- }
-
- /**
- * 加密
- *
- * @param string 明文
- * @param string 密文编码(base64/hex/bin)
- * @param int 填充方式(貌似php有bug,所以目前仅支持OPENSSL_PKCS1_PADDING)
- * @return string 密文
- */
- public function encrypt($data, $code = 'base64', $padding = OPENSSL_PKCS1_PADDING){
- $ret = false;
- if (!$this->_checkPadding($padding, 'en')) $this->_error('padding error');
- if (openssl_public_encrypt($data, $result, $this->pubKey, $padding)){
- $ret = $this->_encode($result, $code);
- }
- return $ret;
- }
-
- /**
- * 解密
- *
- * @param string 密文
- * @param string 密文编码(base64/hex/bin)
- * @param int 填充方式(OPENSSL_PKCS1_PADDING / OPENSSL_NO_PADDING)
- * @param bool 是否翻转明文(When passing Microsoft CryptoAPI-generated RSA cyphertext, revert the bytes in the block)
- * @return string 明文
- */
- public function decrypt($data, $code = 'base64', $padding = OPENSSL_PKCS1_PADDING, $rev = false){
- $ret = false;
- $data = $this->_decode($data, $code);
- if (!$this->_checkPadding($padding, 'de')) $this->_error('padding error');
- if ($data !== false){
- if (openssl_private_decrypt($data, $result, $this->priKey, $padding)){
- $ret = $rev ? rtrim(strrev($result), "\0") : ''.$result;
- }
- }
- return $ret;
- }
-
-
- // 私有方法
-
- /**
- * 检测填充类型
- * 加密只支持PKCS1_PADDING
- * 解密支持PKCS1_PADDING和NO_PADDING
- *
- * @param int 填充模式
- * @param string 加密en/解密de
- * @return bool
- */
- private function _checkPadding($padding, $type){
- if ($type == 'en'){
- switch ($padding){
- case OPENSSL_PKCS1_PADDING:
- $ret = true;
- break;
- default:
- $ret = false;
- }
- } else {
- switch ($padding){
- case OPENSSL_PKCS1_PADDING:
- case OPENSSL_NO_PADDING:
- $ret = true;
- break;
- default:
- $ret = false;
- }
- }
- return $ret;
- }
-
- private function _encode($data, $code){
- switch (strtolower($code)){
- case 'base64':
- $data = base64_encode(''.$data);
- break;
- case 'hex':
- $data = bin2hex($data);
- break;
- case 'bin':
- default:
- }
- return $data;
- }
-
- private function _decode($data, $code){
- switch (strtolower($code)){
- case 'base64':
- $data = base64_decode($data);
- break;
- case 'hex':
- $data = $this->_hex2bin($data);
- break;
- case 'bin':
- default:
- }
- return $data;
- }
-
- private function _getPublicKey($file){
- $key_content = $this->_readFile($file);
- if ($key_content){
- $this->pubKey = openssl_get_publickey($key_content);
- }
- }
-
- private function _getPrivateKey($file){
- $key_content = $this->_readFile($file);
- if ($key_content){
- $this->priKey = openssl_get_privatekey($key_content);
- }
- }
-
- private function _readFile($file){
- $ret = false;
- if (!file_exists($file)){
- $this->_error("The file {$file} is not exists");
- } else {
- $ret = file_get_contents($file);
- }
- return $ret;
- }
-
-
- private function _hex2bin($hex = false){
- $ret = $hex !== false && preg_match('/^[0-9a-fA-F]+$/i', $hex) ? pack("H*", $hex) : false;
- return $ret;
- }
-
-
-
- }
复制代码
测试示例
-
header('Content-Type:text/html;Charset=utf-8;');
-
- include "rsa.php";
-
- echo '
';
- $a = isset($_GET['a']) ? $_GET['a'] : '测试123';
- //////////////////////////////////////
- $pubfile = 'E:\ssl\cert\pwd.crt';
- $prifile = 'E:\ssl\cert\pwd.pem';
-
- $m = new RSA($pubfile, $prifile);
- $x = $m->sign($a);
- $y = $m->verify($a, $x);
- var_dump($x, $y);
-
-
- $x = $m->encrypt($a);
- $y = $m->decrypt($x);
- var_dump($x, $y);
复制代码
|