Struct PublicKey

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

Represents a secp256k1 public key.

const PRIVATE_KEY: [u8; 32] = hex!("e17fe86ce6e99f4806715b0c9412f8dad89334bf07f72d5834207a9d8f19d7f8");

// compressed public keys start with `0x02` or `0x03``, depending on sign of y-component
const COMPRESSED: [u8; 33] = hex!("021464586aeaea0eb5736884ca1bf42d165fc8e2243b1d917130fb9e321d7a93b8");

// full public key without prefix
const UNCOMPRESSED_PLAIN: [u8; 64] = hex!("1464586aeaea0eb5736884ca1bf42d165fc8e2243b1d917130fb9e321d7a93b8fb0699d4f177f9c84712f6d7c5f6b7f4f6916116047fa25c79ef806fc6c9523e");

// uncompressed public keys use `0x04` prefix
const UNCOMPRESSED: [u8; 65] = hex!("041464586aeaea0eb5736884ca1bf42d165fc8e2243b1d917130fb9e321d7a93b8fb0699d4f177f9c84712f6d7c5f6b7f4f6916116047fa25c79ef806fc6c9523e");

let from_privkey = PublicKey::from_privkey(&PRIVATE_KEY).unwrap();
let from_compressed = PublicKey::try_from(COMPRESSED.as_ref()).unwrap();
let from_uncompressed_plain = PublicKey::try_from(UNCOMPRESSED_PLAIN.as_ref()).unwrap();
let from_uncompressed = PublicKey::try_from(UNCOMPRESSED.as_ref()).unwrap();

assert_eq!(from_privkey, from_uncompressed);
assert_eq!(from_compressed, from_uncompressed_plain);
assert_eq!(from_uncompressed_plain, from_uncompressed);

// also works from a signed Ethereum transaction
const TX_HASH: [u8; 32] = hex!("eff80b9f035b1d369c6a60f362ac7c8b8c3b61b76d151d1be535145ccaa3e83e");

const R: [u8; 32] = hex!("c8048d137fbb10ddffa1e4ba5141c300fcd19e4fb7d0a4354ca62a7694e46f9b");
const S: [u8; 32] = hex!("5bb43e23d8b430f17ba3649e38b5a94d02815f0bcfaaf171800c52d4794c3136");
const V: u8 = 1u8;

let mut r_and_s = Vec::<u8>::with_capacity(64);
r_and_s.extend_from_slice(&R);
r_and_s.extend_from_slice(&S);

let sig = Signature::new(&r_and_s, V);

let from_transaction_signature = PublicKey::from_signature_hash(&TX_HASH, &sig).unwrap();

assert_eq!(from_uncompressed, from_transaction_signature);

Implementations

impl PublicKey

pub const SIZE_COMPRESSED: usize = 33usize

Size of the compressed public key in bytes

pub const SIZE_UNCOMPRESSED: usize = 65usize

Size of the uncompressed public key in bytes

pub const SIZE_UNCOMPRESSED_PLAIN: usize = 64usize

pub fn from_privkey(private_key: &[u8]) -> Result<PublicKey>

pub fn from_signature(msg: &[u8], signature: &Signature) -> Result<PublicKey>

pub fn from_signature_hash( hash: &[u8], signature: &Signature, ) -> Result<PublicKey>

pub fn combine(summands: &[&PublicKey]) -> PublicKey

Sums all given public keys together, creating a new public key. Panics if reaches infinity (EC identity point), which is an invalid public key.

pub fn tweak_add(key: &PublicKey, tweak: &[u8]) -> PublicKey

Adds the given public key with tweak times secp256k1 generator, producing a new public key. Panics if reaches infinity (EC identity point), which is an invalid public key.

pub fn to_address(&self) -> Address

Converts the public key to an Ethereum address

pub fn to_bytes(&self, compressed: bool) -> Box<[u8]>

Serializes the public key to a binary form.

pub fn to_hex(&self, compressed: bool) -> String

Serializes the public key to a binary form and converts it to hexadecimal string representation.

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.

impl Display for PublicKey

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

Formats the value using the given formatter.

impl From<&PublicKey> for CurvePoint

fn from(pubkey: &PublicKey) -> Self

Converts to this type from the input type.

impl From<&PublicKey> for ProjectivePoint

fn from(value: &PublicKey) -> Self

Converts to this type from the input type.

impl From<PublicKey<Secp256k1>> for PublicKey

fn from(key: PublicKey<Secp256k1>) -> Self

Converts to this type from the input type.

impl From<PublicKey> for CompressedPublicKey

fn from(value: PublicKey) -> Self

Converts to this type from the input type.

impl From<PublicKey> for CurvePoint

fn from(pubkey: PublicKey) -> Self

Converts to this type from the input type.

impl Hash for PublicKey

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for PublicKey

fn eq(&self, other: &PublicKey) -> 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 Randomizable for PublicKey

fn random() -> Self

Generates a new random public key. Because the corresponding private key is discarded, this might be useful only for testing purposes.

impl TryFrom<&[u8]> for PublicKey

type Error = GeneralError

The type returned in the event of a conversion error.

fn try_from(value: &[u8]) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<AffinePoint> for PublicKey

type Error = CryptoError

The type returned in the event of a conversion error.

fn try_from(value: AffinePoint) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<CurvePoint> for PublicKey

type Error = CryptoError

The type returned in the event of a conversion error.

fn try_from(value: CurvePoint) -> Result<Self, Self::Error>

Performs the conversion.

impl Eq for PublicKey

impl StructuralPartialEq for PublicKey