I don't know about openssl's status on old / weak platforms. People who need AES without hardware AES instructions should be using BearSSL code or the rust code

I don't know about openssl's status on old / weak platforms. People who need AES without hardware AES instructions should be using BearSSL code or the rust code that has been reviewed by the author of BearSSL (see e.g. https://github.com/RustCrypto/block-ciphers/issues/65 https://github.com/RustCrypto/block-ciphers/issues/65).