Enum KemAlgorithm 

pub enum KemAlgorithm {
    MlKem512,
    MlKem768,
    MlKem1024,
    HybridX25519MlKem768,
    XWing,
    Hqc128,
    Hqc192,
    Hqc256,
    Bike,
    ClassicMceliece,
}

Identifies the KEM algorithm used.

Variants

MlKem512

ML-KEM-512 (NIST FIPS 203, Security Level 1)

MlKem768

ML-KEM-768 (NIST FIPS 203, Security Level 3) — recommended default

MlKem1024

ML-KEM-1024 (NIST FIPS 203, Security Level 5)

HybridX25519MlKem768

Hybrid: X25519 + ML-KEM-768 — primary construction (profile v1, HYBRID_PROFILE_V1; see docs/hybrid-profiles.md)

XWing

X-Wing: X25519 + ML-KEM-768, per draft-connolly-cfrg-xwing-kem (profile v2, HYBRID_PROFILE_V2) — same component KEMs as KemAlgorithm::HybridX25519MlKem768, different combiner and byte layout (ML-KEM first). Recommended for new deployments; see docs/hybrid-profiles.md. Added 0.3.0.

Hqc128

HQC-128 (NIST 2025, Security Level 1) — requires hqc feature

Hqc192

HQC-192 (NIST 2025, Security Level 3) — requires hqc feature

Hqc256

HQC-256 (NIST 2025, Security Level 5) — requires hqc feature

Bike

👎Deprecated since 0.3.0:

BIKE was never implemented; the bike feature/module were removed in 0.3.0. This variant is kept only for wire compatibility and will be removed in 0.4.0.

BIKE (NIST Round 4 alternate) — never implemented in this crate.

The bike feature and src/bike module (a permanent compile_error! stub) were removed entirely in 0.3.0. This variant is retained only so previously-serialized values (e.g. "bike" in JSON) continue to deserialize without error; it carries no working implementation in any release and never did. Scheduled for removal in 0.4.0 per STABILITY.md §3’s one-minor-version deprecation floor.

ClassicMceliece

👎Deprecated since 0.3.0:

Classic McEliece was never implemented; the mceliece feature/module were removed in 0.3.0. This variant is kept only for wire compatibility and will be removed in 0.4.0.

Classic McEliece (NIST Round 4 alternate) — never implemented in this crate.

The mceliece feature and src/mceliece module (a permanent compile_error! stub) were removed entirely in 0.3.0. This variant is retained only so previously-serialized values (e.g. "classic_mceliece" in JSON) continue to deserialize without error; it carries no working implementation in any release and never did. Scheduled for removal in 0.4.0 per STABILITY.md §3’s one-minor-version deprecation floor.

Implementations

impl KemAlgorithm

pub fn as_str(&self) -> &'static str

Returns the algorithm identifier string (for DID Documents, JWK, etc.)

pub fn public_key_size(&self) -> usize

Returns the expected public key size in bytes (0 = variable).

pub fn ciphertext_size(&self) -> usize

Returns the expected ciphertext size in bytes (0 = variable).

HQC-128/256 sizes were corrected from 4481/14469 to 4433/14421 bytes during the P2/alpha-001 HQC implementation pass — verified live against both pqcrypto-hqc 0.2.2 and liboqs 0.13.0 (two independent implementations of the same NIST submission, which agree). HQC-192’s 8978-byte ciphertext was already correct. This reflects the HQC round-4/2023 parameter revision to the error-correcting code, which changed ciphertext size at the 128- and 256-bit levels but not the 192-bit level.

pub fn shared_secret_size(&self) -> usize

Returns the shared secret size in bytes (always 32 for all supported algorithms).

Trait Implementations

impl Clone for KemAlgorithm

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for KemAlgorithm

impl Debug for KemAlgorithm

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for KemAlgorithm

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Eq for KemAlgorithm

impl PartialEq for KemAlgorithm

fn eq(&self, other: &Self) -> bool

Equality operator ==.

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

Inequality operator !=.

impl Serialize for KemAlgorithm

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for KemAlgorithm