AES documentation?

[Chris]

Is there any documentation covering the AES support in OpenSSL?  I can't find anything.  There seems to be no manual entry or anything under docs.

I do have it working but I'm wondering how to change the block size (seems to always use 128 bits by default?) and what the difference between AES_encrypt and AES_<mode>_encrypt is.   Does AES_encrypt use ECB, CBC, or what by default?

Thanks