linux - python复写php的代码

1. python里面的pkcs7加密好像实现不一样，得出的结果完全不一样

2. php的代码如下

      public static  function envelope($data){
      $Millisecond = SignEnvelope::getMillisecond();
      //保存源数据文件
      $dataFile = "./rsa/".$Millisecond."data.txt";
      //保存签名文件
      $signedFile = "./rsa/".$Millisecond."signed.txt";
      //保存签名后base64文件
      $signedDataFile = "./rsa/".$Millisecond."signedData.txt";
      //保存信封后文件
      $envelopeFile = "./rsa/".$Millisecond."envelope.txt";
   
      #加载p12
      openssl_pkcs12_read (file_get_contents(Contants::pri), $certs, Contants::passWord);
      $signCert = $certs ['cert'];
      $signKey = $certs['pkey'];
   
      #加载加密证书
      $encryCert = file_get_contents(Contants::pub);
   
      #加密原文
      $fp = fopen($dataFile, "w");
      fwrite($fp, $data);
      fclose($fp);
      #签名
      openssl_pkcs7_sign($dataFile,$signedFile,
                          $signCert, array($signKey,""), NULL, PKCS7_NOATTR|PKCS7_BINARY|PKCS7_NOSIGS);
      $signedBase64 = file_get_contents($signedFile);
      $signedBase64 = substr($signedBase64, strpos($signedBase64, "base64") + strlen("base64"));
      trim($signedBase64);
      #print_r($signedBase64);
      #echo "
   
   
   ";
      $signedData = base64_decode($signedBase64);
      $fp = fopen($signedDataFile, "w");
      fwrite($fp, $signedData);
      fclose($fp);
   
      #信封
      openssl_pkcs7_encrypt($signedDataFile,$envelopeFile,
                              $encryCert, NULL, PKCS7_BINARY, OPENSSL_CIPHER_3DES);
      $envelopeBase64 = file_get_contents($envelopeFile);
      $envelopeBase64 = substr($envelopeBase64, strpos($envelopeBase64, "base64") + strlen("base64"));
      trim($envelopeBase64);
      $envelopeBase64 = base64_decode($envelopeBase64);
      $envelopeBase64 = base64_encode($envelopeBase64);
      //$envelopeBase64 = str_replace("\r\n","",$envelopeBase64);
      //print_r( $envelopeBase64 );
      //删除加密过程中创建的文件
      unlink($dataFile);
      unlink($signedFile);
      unlink($signedDataFile);
      unlink($envelopeFile);
      return $envelopeBase64;

   }

如果要用python实现这个方法的话，应该怎么写？