^- While cheap toy SoCs like those found in SBCs do (all?) have NEON, which includes hardware acceleration for SHA1/2 and AES, don't assume good performance. A x86 desktop core is faster in software than those SoCs with hardware.

However, the poor I/O capabilities of most/all toy SoCs rule use as a high-bandwidth router out; you can't do Gigabit routing with just one built-in MAC and the other connected to a USB 2.0 port or somesuch.