Enum KEM

pub enum KEM {
    DHKEM_P256_HKDF_SHA256,
    DHKEM_P384_HKDF_SHA384,
    DHKEM_P521_HKDF_SHA512,
    DHKEM_X25519_HKDF_SHA256,
    DHKEM_X448_HKDF_SHA512,
}

Key Encapsulation Mechanisms (KEMs)

Value	KEM	Nsecret	Nenc	Npk	Nsk	Auth	Reference
0x0000	(reserved)	N/A	N/A	N/A	N/A	yes	N/A
0x0010	DHKEM(P-256, HKDF-SHA256)	32	65	65	32	yes	NISTCurves, RFC5869
0x0011	DHKEM(P-384, HKDF-SHA384)	48	97	97	48	yes	NISTCurves, RFC5869
0x0012	DHKEM(P-521, HKDF-SHA512)	64	133	133	66	yes	NISTCurves, RFC5869
0x0020	DHKEM(X25519, HKDF-SHA256)	32	32	32	32	yes	RFC7748, RFC5869
0x0021	DHKEM(X448, HKDF-SHA512)	64	56	56	56	yes	RFC7748, RFC5869

The Auth column indicates if the KEM algorithm provides the AuthEncap()/AuthDecap() interface and is therefore suitable for the Auth and AuthPSK modes. The meaning of all other columns is explained below. All algorithms are suitable for the PSK mode.

KEM Identifiers

The “HPKE KEM Identifiers” registry lists identifiers for key encapsulation algorithms defined for use with HPKE. These identifiers are two-byte values, so the maximum possible value is 0xFFFF = 65535.

Template:

• Value: The two-byte identifier for the algorithm
• KEM: The name of the algorithm
• Nsecret: The length in bytes of a KEM shared secret produced by the algorithm
• Nenc: The length in bytes of an encoded encapsulated key produced by the algorithm
• Npk: The length in bytes of an encoded public key for the algorithm
• Nsk: The length in bytes of an encoded private key for the algorithm
• Auth: A boolean indicating if this algorithm provides the AuthEncap()/AuthDecap() interface
• Reference: Where this algorithm is defined

Variants

DHKEM_P256_HKDF_SHA256

0x0010

DHKEM_P384_HKDF_SHA384

0x0011

DHKEM_P521_HKDF_SHA512

0x0012

DHKEM_X25519_HKDF_SHA256

0x0020

DHKEM_X448_HKDF_SHA512

0x0021

Trait Implementations

impl Clone for KEM

fn clone(&self) -> KEM

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for KEM

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

Formats the value using the given formatter.

impl PartialEq for KEM

fn eq(&self, other: &KEM) -> 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 Copy for KEM

impl StructuralPartialEq for KEM