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test(cas): preserve independent Echo identity evidence #781

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Merged
flyingrobots merged 2 commits into from
Oct 8, 2026
Merged

test(cas): preserve independent Echo identity evidence #781

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72aa974
test: preserve independent raw Echo identity vectors
flyingrobots Oct 8, 2026
63135b6
Merge remote-tracking branch 'origin/main' into landing/identity-gold…
flyingrobots Oct 8, 2026
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27 changes: 27 additions & 0 deletions crates/echo-cas/tests/identity_golden.rs
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@@ -0,0 +1,27 @@
// SPDX-License-Identifier: Apache-2.0
// © James Ross Ω FLYING•ROBOTS <https://github.com/flyingrobots>
//! Raw Echo identity vectors retained from PR #723 at db3e5dfe.
//! Original fixture provenance names b3sum 1.8.5. This test does not execute Keep.

use echo_cas::blob_hash;

#[test]
fn raw_echo_identity_matches_retained_independent_vectors() {
let ramp = (u8::MIN..=u8::MAX).collect::<Vec<_>>();
for (bytes, expected) in [
(
&[][..],
"af1349b9f5f9a1a6a0404dea36dcc9499bcb25c9adc112b7cc9a93cae41f3262",
),
(
b"Keep exact bytes.\n".as_slice(),
"3d4f69a42f4cde6629970fe61d548f60d475a0f9ac26a24be5fab204b6eb030a",
),
(
ramp.as_slice(),
"4a495ba42461748eca8fdad618f976aa726cc2903de9fcb40735a786ac1c196b",
),
] {
assert_eq!(blob_hash(bytes).to_string(), expected);
}
}
2 changes: 1 addition & 1 deletion docs/architecture/echo-keep-physical-content-boundary.md
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Expand Up @@ -9,7 +9,7 @@
- **Implementation posture:** `experiments/echo-keep` supplies a bounded dual-identity bridge against Keep revision `3165890e9291cfb5fe10e81a9d7cd151f3e59464` in a separate Rust 1.96 workspace. `echo-cas::physical_content` supplies the fallible complete-object port and MemoryTier/DiskTier adapters. Borrowed views certify no pinned filesystem generation, complete-view absence, retention, synchronization, or crash durability. The disabled-by-default `reference-adapter` feature supplies an in-memory Keep ReferenceStore backend with private identity/layout bindings and explicit payload, object, count and layout-entry limits. Process death loses its store and bindings; no durable Keep adapter is implemented. Echo CAS remains the default.
- **Refines:** [Retained reading storage and proof boundary](../adr/0020-retained-reading-storage-and-proof-boundary.md)
- **Depends on:** [Durable external-action settlement](../adr/0026-durable-external-action-settlement.md)
- **Related:** [Keep authenticated reconstruction contract](https://github.com/flyingrobots/keep/blob/3bf7b9179db41e90620e6d1875c2d40222a2330b/docs/architecture/authenticated-reconstruction-contract.md)
- **Related:** [Keep authenticated reconstruction contract](https://github.com/flyingrobots/keep/blob/3bf7b9179db41e90620e6d1875c2d40222a2330b/docs/invariants/authenticated-reconstruction/README.md)

## Decision

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