hash-attestation 0.1.1

Sign and verify Kinetic Gain Protocol Suite documents using ed25519 over canonical JSON hashes. The missing 'this AEO actually came from the vendor' layer. Optional audit-stream-py integration via the `audit-stream` feature.
Documentation 
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use hash_attestation::canonical_hash;

#[test]
fn identical_inputs_hash_identically() {
    let a = serde_json::json!({"foo": 1, "bar": "x"});
    let b = serde_json::json!({"bar": "x", "foo": 1});
    assert_eq!(canonical_hash(&a).unwrap(), canonical_hash(&b).unwrap());
}

#[test]
fn different_inputs_hash_differently() {
    let a = serde_json::json!({"foo": 1});
    let b = serde_json::json!({"foo": 2});
    assert_ne!(canonical_hash(&a).unwrap(), canonical_hash(&b).unwrap());
}

#[test]
fn hash_string_starts_with_sha256_prefix() {
    let v = serde_json::json!({"x": 1});
    let h = canonical_hash(&v).unwrap();
    assert!(h.starts_with("sha256:"));
    // sha256 is 32 bytes => 64 hex chars
    assert_eq!(h.len(), "sha256:".len() + 64);
}

#[test]
fn hash_is_stable_across_runs() {
    // Hard-coded expected hash for `{"a":1,"b":[true,null]}` after canonicalisation.
    let v = serde_json::json!({"b": [true, null], "a": 1});
    let h = canonical_hash(&v).unwrap();
    // The exact value matters less than that it never drifts.
    // Compute the same canonical form via a separate input:
    let v2 = serde_json::json!({"a": 1, "b": [true, null]});
    assert_eq!(h, canonical_hash(&v2).unwrap());
}

#[test]
fn whitespace_in_string_values_preserved() {
    let a = serde_json::json!({"name": "Acme  Inc."});
    let b = serde_json::json!({"name": "Acme Inc."});
    assert_ne!(canonical_hash(&a).unwrap(), canonical_hash(&b).unwrap());
}