Struct FalconSignature 

pub struct FalconSignature { /* private fields */ }

A Falcon digital signature.

Contains the encoded signature bytes in constant-time (CT) format. Signatures can be exported with to_bytes and imported with from_bytes.

Wire Format

The signature bytes include a 1-byte header, 40-byte nonce, and the encoded signature coefficients. The total size is fixed for CT format (809 bytes for Falcon-512, 1577 bytes for Falcon-1024).

Implementations

impl FalconSignature

pub fn from_bytes(data: Vec<u8>) -> Self

Create a signature from raw bytes (deserialization).

The bytes must be a valid Falcon signature in any supported format. No verification is performed — use verify to check validity.

Example

let kp = FalconKeyPair::generate(9).unwrap();
let sig = kp.sign(b"msg").unwrap();

// Round-trip through bytes
let bytes = sig.to_bytes().to_vec();
let sig2 = FalconSignature::from_bytes(bytes);

pub fn verify( sig: &[u8], pubkey: &[u8], message: &[u8], ) -> Result<(), FalconError>

Verify a signature against a public key and message.

Accepts signatures in any Falcon format (COMPRESSED, PADDED, CT) — the format is auto-detected from the header byte.

Arguments

• sig — The encoded signature bytes.
• pubkey — The encoded public key bytes.
• message — The original message that was signed.

Returns

Ok(()) if valid, Err(FalconError::BadSignature) otherwise.

Example

let kp = FalconKeyPair::generate(9).unwrap();
let sig = kp.sign(b"msg").unwrap();
FalconSignature::verify(sig.to_bytes(), kp.public_key(), b"msg").unwrap();

pub fn to_bytes(&self) -> &[u8]

Get the raw signature bytes (serialization).

The returned bytes can be stored, transmitted, and later restored with from_bytes.

pub fn into_bytes(self) -> Vec<u8>

Consume the signature and return the owned byte vector.

pub fn len(&self) -> usize

Get the length of the signature in bytes.

pub fn is_empty(&self) -> bool

Check if the signature is empty.

Trait Implementations

impl Clone for FalconSignature

fn clone(&self) -> FalconSignature

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for FalconSignature

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

Formats the value using the given formatter.