php实现RSA加密类实例

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！

_getPublicKey($public_key_file); 
  } 
  if ($private_key_file){ 
   $this->_getPrivateKey($private_key_file); 
  } 
 } 
  
 public function sign($data, $code = 'base64'){ 
  $ret = false;
  if (openssl_sign($data, $ret, $this->priKey)){ 
   $ret = $this->_encode($ret, $code);
  }
  return $ret; 
 }
  
 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; 
 } 
  
 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; 
 } 
  
 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 
  
 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：

'; 
$a = isset($_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。