new AES library

Thank you so much for this extremely useful library. I'm not too "up" on C. Would you have any examples on encrypting a string that is longer than the N_BLOCK?

I have hit a stumbling block (no pun intended), and am trying multi-dimentional arrays to create blocks for encrypting/decrypting - I haven't gotten it working so am not even sure if plain and cipher will always be the same length.