Struct KeyFingerprint 

pub struct KeyFingerprint(pub String);

16-hex-char fingerprint of an HMAC key, as it appears in on-disk filenames.

The disk layout partitions every file by the first 8 bytes of blake3::hash(hmac_key) rendered as 16 lowercase hex chars — the sidecar prefix in {fp}-{cache_key}.ptxbin and the middle segment in the artifact store’s {content_hash}.{fp}.bin blobs both use the same fingerprint. Rotating the HMAC key changes the fingerprint, so a rotation leaves the previous generation’s files behind under their old fingerprint, trivially sweepable by KernelCache::gc_disk.

This is not secret: it is blake3(key) truncated, already publicly observable to anyone with directory-list access (it is in the filename). It is a partitioning tag, not a confidentiality boundary — the HMAC trailer on each blob is what actually gates load.

Obtain the fingerprint of the currently-active key via KernelCache::active_disk_key_fingerprint, and the set present on disk via KernelCache::disk_key_fingerprints.

Tuple Fields

0: String

Implementations

impl KeyFingerprint

pub fn of_key(key: &[u8; 32]) -> Self

The 16-hex-char fingerprint of key — the same value the disk layout stamps into filenames. Equivalent to the artifact store’s own key_fingerprint_hex; kept in lock-step so a KernelCache and its underlying DiskArtifactStore always agree on the partition.

pub fn as_str(&self) -> &str

Borrow the underlying hex string.

Trait Implementations

impl Clone for KeyFingerprint

fn clone(&self) -> KeyFingerprint

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for KeyFingerprint

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Display for KeyFingerprint

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Eq for KeyFingerprint

impl Hash for KeyFingerprint

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for KeyFingerprint

fn cmp(&self, other: &KeyFingerprint) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for KeyFingerprint

fn eq(&self, other: &KeyFingerprint) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialOrd for KeyFingerprint

fn partial_cmp(&self, other: &KeyFingerprint) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl StructuralPartialEq for KeyFingerprint