本文实例讲述了php实现RSA加密类。分享给大家供大家参考。具体分析如下:
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。由于各种原因,该类并不十分完善,欢迎各种测试!
<?php /** * 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), " ") : "".$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; } }测试demo:
<?php header("Content-Type:text/html;Charset=utf-8;"); include "rsa.php"; echo "<pre>"; $a = isset($_GET["a"]) ? $_GET["a"] : "测试123"; ////////////////////////////////////// $pubfile = "E:sslcertpwd.crt"; $prifile = "E:sslcertpwd.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);希望本文所述对大家的php程序设计有所帮助。