Hi. Does anyone know where to get a good and lightweight AES library for Java. It should be able to perform AES 256. Bouncycastle is not my choice for now because it contains other encryption algo. I just want pure AES in the library. Thanks.
BouncyCastle being open source, you should be able to remove all the other stuff from the library until nothing but AES is left. The same could be done with the cryptix.org library. Or you could search for "java rijndael implementation" (Rijndael became AES) - there are bound to be more implementations out there (be sure to test them against the NIST test vectors, though).
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AES 256 refers to AES with a 256 bit key -- and a blocksize of 128 bits. There is no such thing as AES with a 256 bit blocksize. You can sensibly ask for Rijndael with a 256 bit blocksize.
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As greg said, AES 256 meant 256 bit key. AES is 128 blocksize, not 256 blocksize. AES 256 meant AES with 256 bit keys, not block size (128 block size cipher for AES). Some people would refer to the Blowfish cipher as Blowfish 448 which means it's still a 64 blocksize but a key of 448 bits long. If a stronger cipher is needed, anyone can turn to the Serpent cipher.