Enum DomainSeparation 

pub enum DomainSeparation<'a> {
    None,
    Context(&'a [u8]),
    Prehashed {
        alg: PreHashAlgorithm,
        context: &'a [u8],
    },
}

Domain separation context for FN-DSA / HashFN-DSA (FIPS 206 §6).

Variants

• None — Pure FN-DSA, no context string (ph_flag = 0x00, context length = 0).

• Context — Pure FN-DSA with an application context string (1–255 bytes, ph_flag = 0x00).

• Prehashed — HashFN-DSA mode (ph_flag = 0x01). The message is pre-hashed; the algorithm OID and optional context string are injected into the hash context.

FIPS 206 Wire Format

For all variants the bytes injected into the hash context (after the 40-byte nonce) are:

• Pure: ph_flag(0x00) || len(ctx) || ctx
• Hashed: ph_flag(0x01) || len(ctx) || ctx || OID || hash(msg)

The context string must not exceed 255 bytes; passing a longer slice returns Err(FalconError::BadArgument).

Variants

None

No context string (pure FN-DSA, empty context).

Context(&'a [u8])

Application context string — max 255 bytes, pure FN-DSA.

Prehashed

HashFN-DSA mode: pre-hash the message with alg, optionally bind with context (max 255 bytes).

Fields

alg: PreHashAlgorithm

Pre-hash algorithm.

context: &'a [u8]

Optional context string (max 255 bytes).

Trait Implementations

impl<'a> Clone for DomainSeparation<'a>

fn clone(&self) -> DomainSeparation<'a>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<'a> Debug for DomainSeparation<'a>

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

Formats the value using the given formatter.

impl<'a> PartialEq for DomainSeparation<'a>

fn eq(&self, other: &DomainSeparation<'a>) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<'a> Copy for DomainSeparation<'a>

impl<'a> Eq for DomainSeparation<'a>

impl<'a> StructuralPartialEq for DomainSeparation<'a>