Crate hashsigs_types 

Profile-safe protocol types and constants shared by software and RHDL models.

HashSigsRS implements a custom WOTS+ construction with n = 32 and w = 16. It is a one-time signature: a private key must sign at most one message. Reusing a key can reveal enough hash-chain material to forge a signature.

This crate deliberately gives the legacy Keccak and generic SHA-256 profiles different Rust types. Their serialized keys and signatures do not contain a profile tag, so applications must also bind a profile identifier in their protocol or persistent metadata.

Structs

HashSigsSha256GenericV1

Performance profile using HashSigsRS’s generic construction with SHA-256.

LegacyKeccak

Legacy Keccak-256 profile, byte-compatible with pinned HashSigsRS.

LengthError

Error returned when a serialized protocol value has the wrong length.

MessageDigest

An already-hashed 32-byte message consumed by the WOTS construction.

ParseProfileIdError

Error returned when text is not an exact canonical ProfileId encoding.

PrivateKey

A one-time WOTS private key bound to cryptographic profile P.

PrivateSeed

A caller-supplied 32-byte seed used to derive one WOTS private key.

PublicKey

A HashSigsRS public key bound to cryptographic profile P.

Signature

A 67-segment WOTS signature bound to cryptographic profile P.

Enums

ProfileId

Stable identifier for a cryptographic profile.

Constants

CHAIN_COUNT

Number of WOTS signature chains (len = len_1 + len_2).

CHAIN_STEPS

Number of hash transitions from a secret segment to a chain endpoint.

CHECKSUM_DIGITS

Number of base-16 digits representing the WOTS checksum (len_2).

FUSED_OUTPUT_BYTES

Number of bytes in a fused signature and public-key result.

HASH_BYTES

Hash output and WOTS security-parameter (n) size in bytes.

LEGACY_FUSED_PRIVATE_KEY_KECCAK_PERMUTATIONS

Keccak-f[1600] permutations used by constant-work fused signing from a key.

LEGACY_FUSED_PRIVATE_SEED_KECCAK_PERMUTATIONS

Keccak-f[1600] permutations used by constant-work fused signing from a seed.

MASK_COUNT

Number of randomization masks that can affect a HashSigsRS result.

MESSAGE_BYTES

Length of an already-hashed message accepted by WOTS, in bytes.

MESSAGE_DIGITS

Number of base-16 digits representing the 256-bit message (len_1).

PRF_INPUT_BYTES

Number of bytes hashed by the domain-separated pseudorandom function.

PUBLIC_KEY_BYTES

Number of bytes in a serialized HashSigsRS public key.

SHA256_FUSED_PRIVATE_KEY_COMPRESSION_BLOCKS

SHA-256 compression blocks used by constant-work fused signing from a key.

SHA256_FUSED_PRIVATE_SEED_COMPRESSION_BLOCKS

SHA-256 compression blocks used by constant-work fused signing from a seed.

SIGNATURE_BYTES

Number of bytes in a serialized WOTS signature.

WINTERNITZ_W

Winternitz parameter (w) and number of positions in each hash chain.

Traits

Profile

Marker implemented by supported, compile-time-separated hash profiles.