feat(ecstore): pin bitrot algorithms with a startup self-test
A drifted HighwayHash implementation fails silently: every shard reads
back corrupt, heal rewrites healthy data, and cross-platform clusters
disagree about which copy is good. Mirror MinIO's bitrotSelfTest by
verifying, once at process start:
- known-answer digests for HighwayHash256S / HighwayHash256SLegacy over
a deterministic 4096-byte xorshift64* payload, plus the externally
verifiable FIPS SHA-256 "abc" vector guarding the HashAlgorithm
plumbing itself;
- an end-to-end roundtrip per streaming variant (encode -> size formula
-> bitrot_verify -> BitrotReader read-back), over full blocks and a
partial tail;
- tamper detection: one flipped byte in the final data block and one in
the leading hash must both be rejected as a hash mismatch, not by an
incidental read error.
The check costs microseconds and runs inline in
init_background_service_runtime before any shard can be written or
verified. Outcome surfaces as one structured bitrot_selftest log event,
the rustfs_bitrot_selftest_status gauge (1=passed / 0=failed / 2=skipped),
a bitrotSelftest field on the admin server-info response, and
RUSTFS_BITROT_SELFTEST_STRICT=on turns a failure into a startup error
(MinIO Fatal parity; the default only degrades the status so a bad build
cannot brick an existing fleet on upgrade).
Closesrustfs/backlog#1873 (HS-11).
Co-authored-by: heihutu <[email protected]>
