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This step is not necessarily a memory-hard function. Memory-hard functions are the best of the breed at the moment, but that's due to current hardware designs, and CPU-hard-but-not-memory-hard functions like PBKDF2 are acceptable as well. We're using “key stretching” as the generic term for such functions. Signed-off-by: Janos Follath <janos.follath@arm.com>