Add RAF (random-access encrypted file) support and aeg.random CSPRNG

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Implement Python bindings for the libaegis 0.10.6 RAF API:

- Thin per-variant wrappers (raf_create/open/read/write/truncate/size/
  sync/close, merkle_rebuild/verify/commitment) generated from a template
  in tools/generate.py, with errno-mapped exceptions.
- aeg.raf: high-level file-like API (Raf, create/open/probe,
  derive_master_key) with pluggable Storage backends (FileStorage,
  BytesIOStorage) and Merkle tree integrity via a MerkleHasher protocol
  (SHA256MerkleHasher default), adapted from pyaegis (MIT).
- aeg.random: CSPRNG facility. Random produces AEGIS keystream seeded
  once from the OS, exposed per cipher module as cipher.random() and
  usable as the RAF RNG (as_raf_rng) or standalone RandomSource.
- Tests: roundtrip/random-access/seek/truncate/Merkle coverage for all
  six variants, pyaegis-style API checks, and a Merkle fuzz test.

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LeoVasanko committed 2026-10-04 04:25:59 +00:00

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tests/test_raf_pyaegis.py

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