Crate spg_crypto 

BLAKE3 cryptographic hash — self-built single-thread implementation. Follows the spec at https://github.com/BLAKE3-team/BLAKE3-specs/blob/master/blake3.pdf.

Scope: unkeyed hash(input) -> [u8; 32] only. KDF / keyed-hash modes are out of scope.

v3.0.4 attempted a NEON-vectorised compress for aarch64 but the benchmark regressed 1.5–2× — see the comment on fn compress. The NEON path is kept under #[cfg(test)] as a cross-check oracle.

Modules

base64

Base64 (RFC 4648 standard alphabet) — encode + decode.

crc32

IEEE 802.3 CRC-32 (the “zip / png / ethernet” variant).

hmac

HMAC-SHA-256 — self-built per RFC 2104.

lzss

v6.6.0 — LZSS (Lempel-Ziv-Storer-Szymanski 1982) encoder + decoder.

pbkdf2

PBKDF2-HMAC-SHA-256 — RFC 8018 §5.2.

sha256

SHA-256 — self-built per FIPS 180-4 §6.2.

Constants

OUT_LEN

Functions

hash

Top-level BLAKE3 hash. Returns the 32-byte digest.

hex

Helper: format a 32-byte digest as a lower-case hex string (no separators). Allocates a 64-character String. Useful for tests / human-facing logs.