Error in Decryption --> Invalid padding and Data size is not block size multipleRSS

• • Reply
  pulanarasima

  Member

  30 Points

  20 Posts

  Error in Decryption --> Invalid padding and Data size is not block size multiple

  Nov 03, 2014 07:09 AM|pulanarasima|LINK

  
  Hi All,

  Could you please help me on this error anybody its very urgnet issue in production.

  i have an issue while doing the decription with ingrainkey value got below 2 errors.
  1. Error in Decryption --> Invalid padding.
  2. Error in Decryption --> Data size is not block size multiple.
  why these two above errors got while doing decription with current key but same files encripted without
  any errors and we are not able to download the files form UI side and got above two errors those file manualy able to opened.
  Please help me what is the issue here from files or decription/encription/ code side while download the files.

  Thansks in advance.

  Regards,
  Narasimha

  asp.net

  Regards,
  Narasimha
• • Reply
  Summer - MSF...

  Contributor

  6495 Points

  1163 Posts

  Re: Error in Decryption --> Invalid padding and Data size is not block size multiple

  Nov 04, 2014 09:20 PM|Summer - MSFT|LINK

  Hi pulanarasima，

  Welcome to the ASP.NET forum.

  pulanarasima

  i have an issue while doing the decription with ingrainkey value got below 2 errors.
  1. Error in Decryption --> Invalid padding.
  2. Error in Decryption --> Data size is not block size multiple.

  About these error messages, if you could provide some main code, maybe it is helpful for someone to analysis your problems and give you some suggestions.

  I find a similar thread and you could try to refer to it and hope it could helpful for you.

  https://social.msdn.microsoft.com/Forums/vstudio/en-US/d1788582-bf8c-43ec-a686-49647c359136/unexplained-cryptographicexception-padding-is-invalid?forum=netfxbcl

  Best Regards,

  Summer

  asp.net

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• • Reply
  pulanarasima

  Member

  30 Points

  20 Posts

  Re: Error in Decryption --> Invalid padding and Data size is not block size multiple

  Nov 18, 2014 06:18 AM|pulanarasima|LINK

  Hi Summer,

     Thanks for giving response and please find below code...decryption.Please help me on this .

  FileStream fSource;
  FileStream fDestination;
  ICryptoTransform dec;
  Byte[] inputChar = null;
  Byte[] decryptedChar = null;
  //Int64 bfrSize = 9999999;
  int count;
  int decryptedCount;
  int dataSize = 150000;

  string sourcePath = ConfigurationSettings.AppSettings["EncryptedBackUpFilesPath"] + fileName;
  string destinationPath = ConfigurationSettings.AppSettings["DecryptedFiles"] + fileName;
  fSource = File.OpenRead(sourcePath);
  fDestination = File.Create(destinationPath);
  inputChar = new Byte[dataSize + 16];
  decryptedChar = new Byte[dataSize + 16];

  dec = nKey.CreateDecryptor();
  
  try
  {
  count = fSource.Read(inputChar, 0, dataSize);
  while (count > 0)
  {
  decryptedCount = dec.TransformBlock(inputChar, 0, count, decryptedChar, 0);
  fDestination.Write(decryptedChar, 0, decryptedCount);
  count = fSource.Read(inputChar, 0, dataSize);
  fDestination.Write(decryptedChar, 0, decryptedCount);
  AesManaged aes = new AesManaged();
  // aes.Padding = PaddingMode.None;
  }
  decryptedChar = dec.TransformFinalBlock(inputChar, 0, count); ---here getting the those two errors.

  fDestination.Write(decryptedChar, 0, decryptedChar.Length);
  Logger.LogError(destinationPath + " is decrypted. POMID is --> " + pomId);
  
  //CryptoStream crStream = new CryptoStream(fDestination, nKey.CreateEncryptor(), CryptoStreamMode.Write);
  //crStream.FlushFinalBlock();}

  catch (NAEException ex)
  {
  Logger.LogError("Error in Decryption --> " + ex.Message);
  }
  finally
  {
  inputChar = null;
  decryptedChar = null;
  fSource.Flush();
  fDestination.Flush();
  fDestination.Close();
  fSource.Close();
  }

  asp.net

  Regards,
  Narasimha
• • Reply
  May-song

  Member

  360 Points

  109 Posts

  Re: Error in Decryption --> Invalid padding and Data size is not block size multiple

  Nov 21, 2014 03:55 AM|May-song|LINK

  Hi

  pulanarasima

  please find below code...decryption.Please help me on this .

  These code couldn't work? or have some error messages? please provide more information about your requirement?

  May

  asp.net