EldoS | Feel safer!

Software components for data protection, secure storage and transfer


Also by EldoS: CallbackDisk
Create virtual disks backed by memory or custom location, expose disk images as disks and more.
Posted: 11/30/2008 21:44:14
by Alex Nail (Basic support level)
Joined: 08/27/2008
Posts: 16

I'm using secureblackboxpgp.dll version on two Windows 2000 servers, one is development one production.

The file I'm decrypting contains Hex value 85 (...). My application decrypts this file but replaces the hex value of 85 with 3F (?). In production, the file decrypts as well, but doesn't recognize the hex value 85 at all.

For example...

Development Decryption - 1234?5678
Production Decryption - 12345678

The sample programs decrypt the file just fine.

Any ideas what may be causing this?


Posted: 12/01/2008 00:09:03
by Eugene Mayevski (Team)

Is the value of 0x85 located in the *encrypted* block or it is supposed to be present in the decrypted data?

Sincerely yours
Eugene Mayevski
Posted: 12/01/2008 06:27:40
by Alex Nail (Basic support level)
Joined: 08/27/2008
Posts: 16

The value should be present in the decrypted data.

Posted: 12/01/2008 06:39:40
by Ken Ivanov (Team)

Don't you use StreamReader or StreamWriter class in your application?
Posted: 12/01/2008 07:09:46
by Alex Nail (Basic support level)
Joined: 08/27/2008
Posts: 16

Yes, here's the call that's made to write the decrypted file...

FileStream fsBak=null;

fsBak= System.IO.File.Create(filePath);
System.Text.ASCIIEncoding encoding=new System.Text.ASCIIEncoding();
byte[] bFileData = encoding.GetBytes(document);
return Success;
catch(Exception ex)
("RMIC.B2B.Common.Utils.Library.BackupFile","Error Backing up file - " + filePath);
System.Diagnostics.EventLog.WriteEntry("EDIReceiveHandler", ex.Message, System.Diagnostics.EventLogEntryType.Error);
return Failed;

if (fsBak!=null)
Posted: 12/01/2008 07:17:05
by Ken Ivanov (Team)

That clarifies everything. As 0x85 character is not an ASCII character, ASCIIEncoding class breaks the decrypted data.
Posted: 12/01/2008 07:45:59
by Alex Nail (Basic support level)
Joined: 08/27/2008
Posts: 16

Yes, makes sense. How are the demos handling this?
Posted: 12/01/2008 07:58:09
by Ken Ivanov (Team)

The demos work directly with System.IO.FileStream objects, thus there's no intermediate string-to-byte-array conversions.
Also by EldoS: CallbackFilter
A component to monitor and control disk activity, track file and directory operations (create, read, write, rename etc.), alter file data, encrypt files, create virtual files.



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