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bmpRot

A unit for rotating TBitmaps 90, 180, or 270 degrees. Works in D1, D2, D3, and D4. Not entirely optimized, but quick enough. It rotates a 1600x1200 image in 800 msec on my Pentium II (400 MHz).

PanZoom

New and improved!

Updated to fix a few display bugs that no one will probably notice, I present my TPanZoomPanel. This is a descendent of TPanel that can display an image, pan, zoom, and paint on it. You can define a coordinate system at any time, and the panel will perform the necessary affine transformations to correctly scale the coordinates, through all the panning and zooming you want. You can even paint while zoomed in!

MessageDigests

A collection of classes for creating message digests, including MD2, MD4, MD5, SHA-1, and RIPEMD-160. Also includes a class for making secure hashes (HMACs) out of these digests. The hierarchy works out real neat, so they all have a common interface, and a cute little virtual constructor mechanism for creating the HMAC class.

BlockCiphers

A block cipher class hierarchy. Currently includes TDESCipher and TBlowfishCipher, with more to come soon. The ciphers all descend from TBlockCipher, whose constructor is virtual, allowing for polymorphic instantiation of any cipher you choose. The DES implementation has been heavily optimized with a lot of help from Bob Lee. It encrypts 4.2 megs/sec on my Pentium II. Blowfish has been similarly optimized, encrypting 6.5 megs/sec.

EncryptedRegistry

Contains a TEncryptedRegistry class. This class has the same interface as TRegistry, but it encrypts/decrypts data being written/read. This requires the BlockCiphers unit.

RegistryNotification

Contains a TRegistryNotifier class. This class creates a thread that waits for a change in a registry key, and terminates when the event happens.