Module hash 

Poseidon2 hash over the Goldilocks field used by the Lighter signer.

Exposes the fixed-width permutation permute together with the sponge API the Lighter Schnorr binding consumes (hash_no_pad, hash_two_to_one, hash_n_to_one, hash_to_quintic_extension). Parameter constants live in params and were transcribed from the Apache-2.0 Go reference; equivalence is verified by fixture vectors under test_data/.

Re-exports

pub use params::RATE;

pub use params::ROUNDS_F;

pub use params::ROUNDS_F_HALF;

pub use params::ROUNDS_P;

pub use params::WIDTH;

Modules

params

Lighter Poseidon2 parameter set, defined verbatim from the Apache-2.0 Go reference implementation elliottech/poseidon_crypto at the pinned revision recorded in the fixture metadata. Each round constant, the diagonal of the internal MDS matrix, and the round counts must agree byte-for-byte with that reference; the fixture vectors under test_data/ verify equivalence.

Constants

HASH_OUT

Output digest of the standard Poseidon2 hash, holding HASH_OUT field elements.

Functions

hash_n_to_hash_no_pad

Compress an arbitrary-length input to a fixed HASH_OUT-element digest.

hash_n_to_m_no_pad

Variable-length absorb / variable-length squeeze sponge built on permute.

hash_n_to_one

Iteratively compress inputs left-to-right via hash_two_to_one.

hash_no_pad

Convenience alias for hash_n_to_hash_no_pad matching the Lighter Go API.

hash_to_quintic_extension

Hash an arbitrary-length input into the quintic extension Fp5.

hash_two_to_one

Two-to-one compression of two HASH_OUT-element digests.

hash_two_to_quintic

Hash a (Fp5, Fp5) pair as a 10-element preimage into a single Fp5.

permute

In-place Poseidon2 permutation over a WIDTH-element state.