Struct Blake3KeyedHasher 

pub struct Blake3KeyedHasher { /* private fields */ }

Keyed (derived-key) BLAKE3 hasher, equivalent to the oracle’s b3sum --derive-key="<context>" --no-names.

The oracle switches to keyed mode whenever the SNAPDIR_MANIFEST_CONTEXT environment variable is non-empty (and only for b3sum; see _snapdir_manifest_define_checksum_fn). Per the library-purity principle, snapdir-core does not read that environment variable: the CLI lane reads it and constructs this hasher with the context string passed in as a parameter.

The digest is blake3::derive_key(context, input) rendered as lowercase hex, byte-for-byte identical to b3sum --derive-key=<context> --no-names.

Implementations

impl Blake3KeyedHasher

pub fn new(context: impl Into<String>) -> Self

Creates a keyed BLAKE3 hasher deriving its key from context.

context is the SNAPDIR_MANIFEST_CONTEXT value the CLI lane reads from the environment; core never reads it itself.

Trait Implementations

impl Clone for Blake3KeyedHasher

fn clone(&self) -> Blake3KeyedHasher

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Blake3KeyedHasher

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

Formats the value using the given formatter.

impl Hasher for Blake3KeyedHasher

fn hash_hex(&self, bytes: &[u8]) -> String

Returns the lowercase hex checksum of bytes.