PR description:
As far as I can tell this AES-128 code has never been in use in the project (outside of testing/benchmarking). The AES-256 code is used in CCrypter::Encrypt/CCrypter::Decrypt (src/wallet/crypter.cpp). Trivia: 0.15% of the project's C++ LOC count (excluding dependencies) is trimmed off
Backport of Core PR15663