These benchmark values were collected with the fastmath library in use, on an esp32-wroom-32 with CPU speed:240MHz, ESP-IDF version v3.3-beta1-39-g6cb37ecc5(commit hash: 6cb37ecc5), and operating system Ubuntu 18.04.1 LTS (Bionic Beaver).Software encryption:
AES-128-CBC-enc 1 MB took 1.001 seconds, 1.146 MB/s
AES-128-CBC-dec 1 MB took 1.017 seconds, 1.104 MB/s
AES-192-CBC-enc 1 MB took 1.018 seconds, 1.055 MB/s
AES-192-CBC-dec 1 MB took 1.006 seconds, 1.019 MB/s
AES-256-CBC-enc 1000 KB took 1.000 seconds, 1000.000 KB/s
AES-256-CBC-dec 975 KB took 1.007 seconds, 968.222 KB/s