Struct FnDsaSignature 

pub struct FnDsaSignature { /* private fields */ }

An FN-DSA / HashFN-DSA digital signature.

Signature bytes are in constant-time (CT) format: 666 bytes for FN-DSA-512, 1280 bytes for FN-DSA-1024.

Implementations

impl FnDsaSignature

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

Deserialize a signature from raw bytes.

Returns Err(FalconError::FormatError) if the bytes are too short (minimum 41 bytes: 1 header + 40 nonce) or the header byte is invalid.

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

Verify a signature against pubkey and message.

The domain must exactly match what was used during signing (same variant, same context string, same pre-hash algorithm).

Supports pure FN-DSA and HashFN-DSA transparently.

Errors

• FalconError::BadArgument — context string > 255 bytes.
• FalconError::BadSignature — signature is invalid.
• FalconError::FormatError — malformed key or signature.

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

Get the raw signature bytes.

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

Consume and return the owned byte vector.

pub fn len(&self) -> usize

Signature length in bytes.

pub fn is_empty(&self) -> bool

Returns true if the signature byte vector is empty.

Trait Implementations

impl Clone for FnDsaSignature

fn clone(&self) -> FnDsaSignature

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for FnDsaSignature

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

Formats the value using the given formatter.