This library securely encrypts and decrypts files. It uses the Advanced Encryption Standard (AES) and SHA-256 algorithms. KeeCryptLib attempts to make dictionary-attacks a bit harder by encrypting the master key multiple times before using it (this adds a linear time factor). In order to generate the IVs and master seeds, it collects various more or less random things from Windows (mouse cursor position, time, memory status, etc.).

KeeCryptLib is distributed under the terms of the BSD license. Feel free to use the library in your project (the API is pretty simple, have a look at it!).