php RAS加密类代码

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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。
 
<?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), "\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; 
    } 
   
   
   
}  

测试示例
<?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:\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);