Struct PublicKey 

pub struct PublicKey(/* private fields */);

P-521 (secp521r1) ECDSA public key.

Supports signature verification and ECDH key agreement.

Verification

use crypto::p521::SecretKey;

let key = SecretKey::generate().unwrap();
let signature = key.sign(b"message").unwrap();
assert!(key.public_key().verify(b"message", &signature).is_ok());

Implementations

impl PublicKey

pub fn from_bytes(key: &[u8]) -> Result<PublicKey, EllipticCurveError>

Parses a compressed (67-byte) or uncompressed (133-byte) SEC1 encoding.

Returns EllipticCurveError::InvalidKey when the encoding is not a valid point on the P-521 curve.

pub fn from_x_y( x_bytes: &[u8; 66], y_bytes: &[u8; 66], ) -> Result<PublicKey, EllipticCurveError>

Builds a public key from raw affine x and y coordinates (both big-endian, 66 bytes each). Returns InvalidKey if the coordinates are not a valid point on the P-521 curve.

This is useful when importing keys from formats like JWK where x and y are available directly.

pub fn verify( &self, message: &[u8], signature: &[u8; 132], ) -> Result<(), EllipticCurveError>

Verifies an ECDSA signature over message using SHA-512.

Both canonical low-s and non-canonical high-s signatures are accepted, matching typical ECDSA interoperability. Use Self::verify_strict to additionally reject high-s signatures.

pub fn verify_strict( &self, message: &[u8], signature: &[u8; 132], ) -> Result<(), EllipticCurveError>

Verifies an ECDSA signature over message using SHA-512, additionally rejecting non-canonical high-s signatures (s > n / 2).

Use this when signature malleability must be excluded (Bitcoin/EIP-2 style). Note that some third-party signers emit high-s signatures, which this method will reject; Self::verify accepts both forms.

pub fn to_bytes(&self) -> [u8; 133]

Returns the 133-byte uncompressed SEC1 encoding (0x04 || x || y).

pub fn to_compressed_bytes(&self) -> [u8; 67]

Returns the 67-byte compressed SEC1 encoding (0x02/0x03 || x).

pub fn x_y(&self) -> ([u8; 66], [u8; 66])

Returns the X and Y points as big-endian arrays.

Trait Implementations

impl Clone for PublicKey

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 PublicKey

impl Debug for PublicKey

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

Formats the value using the given formatter.

impl Eq for PublicKey

impl PartialEq for PublicKey

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for PublicKey