Note: This page and the original code for DCPcrypt hasn't seen much attention in quite a while and is unlikely to for the foreseeable future. All the updates below are contributed by others.

A further update for Delphi XE (21-07-2012):

I have updated DCPCrypt (version dcpcrypt_2.0.4.1_xe2.zip)
with the following changes:

1) The same code now compiles and works under Delphi XE2 (32 and 64
bit), Delphi 2009 and Delphi 5, and presumably under other versions
between Delphi 5 and 2007. It used JEDI.INC (from Jedi Code Library)
to distinguish between compiler versions.

2) SelfTest.dpr can be used to run SelfTest on all available
algorithms. Also works in all Delphi versions listed above.

The archive is here:
http://www.pepak.net/files/tools/dcpcrypt.zip

Thanks for the library!

Pepak

A local copy of the code is available in case the above link dies: dcpcrypt2-xe-update2.zip

Update for Delphi XE (29-11-2011): From https://forums.embarcadero.com/thread.jspa?messageID=417095#417095

Hi,

I needed to use DCPCrypt under Delphi XE2/dcc64 but currently there is
no available version of this library which officially supports a such
build configuration. The latest version of DCPCrypt for Delphi is v2
beta 3 with Unicode fixes, updated by Henri Gourvest and available here:
http://www.cityinthesky.co.uk/opensource/dcpcrypt

So I merged my original code with the Lazarus version that was already
adapted for the FPC 64 bit compiler some years ago, and modified the
code to allow the compilation under dcc64.

The library seems to work under Win64 - at least all the internal tests
succeeds. But from my POV it really deserves external code review and
additional testing. So if you're a DCPCrypt user who plan to use the
library under XE2 to produce 64 bit apps, could you take the time to
check if all works fine on your side too ?

Link to the updated library :
http://reisubar.net/dcpcrypt/DCPCrypt_2.0.4.1_XE2.zip

BTW, I also fixed a bug in TDCP_customice.InitIce(), where the "kb"
array was accessed outside of its bound (the AV was only raised under
Win64).

Thanks for your feedback !

Adrien 

A local copy of the code is available in case the above link dies: dcpcrypt_2.0.4.1_xe2.zip

Bug in RC4 implementation: Ray Marron has reported a bug in the RC4 implementation in DCPcrypt that means that when encrypting data sets over 8192 bytes in size the results will non-standard.

Update for Delphi 2009/2010: thanks to Lorenzo Monti for providing updated string encryption routines to work with unicode strings.

Update for Delphi 2009: thanks to Henri Gourvest for providing an update to make this package work under Delphi 2009.

DCPcrypt is an open source library of cryptographic components (encryption algorithms and hash algorithms) for Borland Delphi and Kylix (it also works under some versions of C++ Builder). I haven't been able to update it for quite a long time now but it still works quite happily with Delphi 4, 5, 6, 7 and 2005 and Kylix 1 and 2 (it might work under Kylix 3, but I don't have a copy to try it out on). The current version (v2 beta 3) is considered to be stable and for all intents and purposes is the final release before I revamp everything.

Thanks to Manuel C. for making changes to the code to make this work under Delphi 2005!

For those of you using PHP, here is a little demo showing how to get PHP and Delphi encryption to work together.

The idea behind DCPcrypt is that it should be possible to “drop in” any algorithm implementation to replace another with minimum or no code changes. To aid in this goal all cryptographic components are descended from one of several base classes, TDCP_cipher for encryption algorithms and TDCP_hash for message digest algorithms.

DCPcrypt v2 contains full implementations of the following algorithms: Encryption Algorithms

DCPcrypt is open source software (released under the MIT license) and as such there is no charge for inclusion in other software.

You can make donations via Paypal to the Paypal address paypal@cityinthesky.co.uk or by clicking the Donate button.

Alternatively, if you can buy me a gift from my wish list at Amazon.co.uk. Thanks!

• DCPcrypt Demos - Two demos for use with DCPcrypt v2.
• DCPcrypt v2 for Delphi 2009/2010 - same as v2 beta 3 but update for Delphi 2009/2010 (additional unicode string encryption).
• DCPcrypt v2 for Delphi 2007/2009 - same as v2 beta 3 but update for Delphi 2009 (old).
• DCPcrypt v2 Beta 3 - RECOMMENDED: The very latest version with full(?) documentation.
• DCPcrypt v1.31 - The last of the “old style” library series. All the implementations work correctly however it is recommended that you use the v2 beta.

If for some strange reason you'd like to contact me, try emailing me at davebarton@cityinthesky.co.uk.

Make sure the subject line is something noticeable e.g. “DCPcrypt”. If you don't get a reply within a week or two then try sending your message again.