>Hello,
>
>Where can I get source code that would let me encrypt in AES-256 in VFP9?
>
>I know that I could do that with ChilKat for example, but In don't think that we have access to the source code.
>
>Regards and a Happy new year to you all!

AES is a subset of Rijndael. AES' blocksize is 16 bytes, whereas Rijndael's can use 16, 24 or 32 bytes
If you start to use it you have to know something about
- symmetric block cipher, ie works on blocks of bytes https://en.wikipedia.org/wiki/Block_cipher
- Padding (of last block) https://en.wikipedia.org/wiki/Padding_(cryptography)
- optional IV (initalization vector) https://en.wikipedia.org/wiki/Initialization_vector

Here http://atoutfox.com/articles.asp?ACTION=FCONSULTER&ID=0000000934 you can find
- AES using windows API
- Rijndael in vfp ( set the blocksize to 16 bytes and you have AES)

enjoy,