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crypto/rijndael. Additionally, I applied the AES integration patch from Stephen Sprunk <stephen@sprunk.org> and fiddled it to work properly with the normal EVP constructs (and incidently work the same way as all other symmetric cipher implementations). This results in an API that looks a lot like the rest of the OpenSSL cipher suite.
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.