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5e79f6a9ed
This is an architecture document focusing on how parts of the code base can accommodate both builds with PSA crypto disabled and builds with driver-only mechanisms. Going forward, this coexistence is no longer relevant. The document does explain why some parts of md and cipher are the way they are. In the future, we'll want to remove legacy code paths and keep only the PSA code paths. But for that, it isn't particularly useful to know how the dual code paths came about, or what constraints they had to obey. Those constraints no longer apply. Signed-off-by: Janos Follath <janos.follath@arm.com>