ref: dd856bca71a1d4ef5ae8bc08e575b2f7a1e239d9
dir: /sys/src/ape/lib/openssl/crypto/aes/README/
This is an OpenSSL-compatible version of AES (also called Rijndael). aes_core.c is basically the same as rijndael-alg-fst.c but with an API that looks like the rest of the OpenSSL symmetric cipher suite.