AES is a 128-bit block cipher supporting keys of 128, 192, and 256 bits.
不要被一些在线测试工具给忽悠了。
参考:
原理浅析:https://www.sohu.com/a/201169795_466846
块大小:https://stackoverflow.com/questions/15434802/how-to-set-blocksize-and-keysize-using-aes-encription-in-java?rq=1