Implement SHA-256 and SHA-512 hashed passwords#75

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pitpalme wants to merge 7 commits intoabbot:masterfrom

pitpalme:feature/sha-crypt

Commits on May 9, 2021

Implement SHA-256 and SHA-512 hashed passwords
Peter Palmreuther
committed
Fix integer literal
Peter Palmreuther
committed

Commits on May 10, 2021

Move SHA-crypt implementation
Peter Palmreuther
committed
Move SHA-crypt test to individual test file
Peter Palmreuther
committed

Commits on May 11, 2021

Add some sanity check and cleanup code
Peter Palmreuther
committed
Reduce memory footprint
Peter Palmreuther
committed
Reduce number of memory allocations
Peter Palmreuther
committed