Enum PublicKey 

pub enum PublicKey {
    ES256 {
        x: Vec<u8>,
        y: Vec<u8>,
    },
    ES384 {
        x: Vec<u8>,
        y: Vec<u8>,
    },
    EdDSA(Vec<u8>),
    RS256 {
        n: Vec<u8>,
        e: Vec<u8>,
    },
}

The public key extracted from a COSE key structure during registration.

Four algorithms are supported:

• ES256 — ECDSA P-256 with SHA-256 (COSE alg -7). Most common.
• ES384 — ECDSA P-384 with SHA-384 (COSE alg -35).
• EdDSA — Ed25519 (COSE alg -8). Used by newer FIDO2 authenticators.
• RS256 — RSA PKCS#1 v1.5 with SHA-256 (COSE alg -257). Used by older YubiKey 4-series devices and Windows Hello.

Variants

ES256

P-256 ECDSA public key (COSE alg -7, kty 2).

x and y are the 32-byte affine coordinates of the public point. To obtain the 65-byte uncompressed point for ring, prepend 0x04: 0x04 || x (32 bytes) || y (32 bytes).

Fields

x: Vec<u8>

y: Vec<u8>

ES384

P-384 ECDSA public key (COSE alg -35, kty 2).

x and y are the 48-byte affine coordinates of the public point. To obtain the 97-byte uncompressed point for ring, prepend 0x04: 0x04 || x (48 bytes) || y (48 bytes).

Fields

x: Vec<u8>

y: Vec<u8>

EdDSA(Vec<u8>)

Ed25519 EdDSA public key (COSE alg -8, kty 1 OKP).

The inner Vec<u8> is the raw 32-byte Ed25519 public key, as encoded in COSE OKP key parameter -2 (x).

RS256

RSA PKCS#1 v1.5 SHA-256 public key (COSE alg -257, kty 3).

n is the big-endian modulus (256 bytes for a 2048-bit key). e is the big-endian public exponent (typically [0x01, 0x00, 0x01]).

Fields

n: Vec<u8>

e: Vec<u8>

Implementations

impl PublicKey

pub fn algorithm(&self) -> i64

Return the COSE algorithm identifier for this key.

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

Return a human-readable description of the key type.

Trait Implementations

impl Clone for PublicKey

fn clone(&self) -> PublicKey

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for PublicKey

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

Formats the value using the given formatter.