DCPcrypt
Note: This page hasn't seen much attention in quite a while and is unlikely to for the foreseeable future…
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
| Encryption Algorithms | Hash Algorithms |
|---|---|
| Blowfish | Haval |
| Cast 128 | MD4 |
| Cast 256 | MD5 |
| DES, 3DES | RipeMD-128 |
| Ice, Thin Ice, Ice2 | RipeMD-160 |
| IDEA | SHA-1 |
| Mars | SHA-256, SHA-384, SHA-512 |
| Misty1 | Tiger |
| RC2, RC4, RC5, RC6 | |
| Rijndael (the AES) | |
| Serpent | |
| Tea | |
| Twofish |
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.
