Struct secp256k1::PublicKey

source ·
pub struct PublicKey(/* private fields */);
Expand description

Public key - used to verify ECDSA signatures and to do Taproot tweaks.

§Serde support

Implements de/serialization with the serde feature enabled. We treat the byte value as a tuple of 33 u8s for non-human-readable formats. This representation is optimal for for some formats (e.g. bincode) however other formats may be less optimal (e.g. cbor).

§Examples

Basic usage:

use secp256k1::{SecretKey, Secp256k1, PublicKey};

let secp = Secp256k1::new();
let secret_key = SecretKey::from_slice(&[0xcd; 32]).expect("32 bytes, within curve order");
let public_key = PublicKey::from_secret_key(&secp, &secret_key);

Implementations§

source§

impl PublicKey

source

pub fn cmp_fast_unstable(&self, other: &Self) -> Ordering

Like cmp::Cmp but faster and with no guarantees across library versions.

The Cmp implementation for FFI types is stable but slow because it first serializes self and other before comparing them. This function provides a faster comparison if you know that your types come from the same library version.

source

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

Like cmp::Eq but faster and with no guarantees across library versions.

The Eq implementation for FFI types is stable but slow because it first serializes self and other before comparing them. This function provides a faster equality check if you know that your types come from the same library version.

source§

impl PublicKey

source

pub fn as_ptr(&self) -> *const PublicKey

👎Deprecated since 0.25.0: Use Self::as_c_ptr if you need to access the FFI layer

Obtains a raw const pointer suitable for use with FFI functions.

source

pub fn as_mut_ptr(&mut self) -> *mut PublicKey

👎Deprecated since 0.25.0: Use Self::as_mut_c_ptr if you need to access the FFI layer

Obtains a raw mutable pointer suitable for use with FFI functions.

source

pub fn from_secret_key<C: Signing>( secp: &Secp256k1<C>, sk: &SecretKey, ) -> PublicKey

Creates a new public key from a SecretKey.

§Examples
use secp256k1::{rand, Secp256k1, SecretKey, PublicKey};

let secp = Secp256k1::new();
let secret_key = SecretKey::new(&mut rand::thread_rng());
let public_key = PublicKey::from_secret_key(&secp, &secret_key);
source

pub fn from_ellswift(ellswift: ElligatorSwift) -> PublicKey

Creates a new public key from an ElligatorSwift.

source

pub fn from_secret_key_global(sk: &SecretKey) -> PublicKey

Creates a new public key from a SecretKey and the global SECP256K1 context.

source

pub fn from_slice(data: &[u8]) -> Result<PublicKey, Error>

Creates a public key directly from a slice.

source

pub fn from_keypair(keypair: &Keypair) -> Self

Creates a new compressed public key using data from BIP-340 Keypair.

§Examples
use secp256k1::{rand, Secp256k1, PublicKey, Keypair};

let secp = Secp256k1::new();
let keypair = Keypair::new(&secp, &mut rand::thread_rng());
let public_key = PublicKey::from_keypair(&keypair);
source

pub fn from_x_only_public_key(pk: XOnlyPublicKey, parity: Parity) -> PublicKey

Creates a PublicKey using the key material from pk combined with the parity.

source

pub fn serialize(&self) -> [u8; 33]

Serializes the key as a byte-encoded pair of values. In compressed form the y-coordinate is represented by only a single bit, as x determines it up to one bit.

source

pub fn serialize_uncompressed(&self) -> [u8; 65]

Serializes the key as a byte-encoded pair of values, in uncompressed form.

source

pub fn negate<C: Verification>(self, secp: &Secp256k1<C>) -> PublicKey

Negates the public key.

source

pub fn add_exp_tweak<C: Verification>( self, secp: &Secp256k1<C>, tweak: &Scalar, ) -> Result<PublicKey, Error>

Tweaks a PublicKey by adding tweak * G modulo the curve order.

§Errors

Returns an error if the resulting key would be invalid.

source

pub fn mul_tweak<C: Verification>( self, secp: &Secp256k1<C>, other: &Scalar, ) -> Result<PublicKey, Error>

Tweaks a PublicKey by multiplying by tweak modulo the curve order.

§Errors

Returns an error if the resulting key would be invalid.

source

pub fn combine(&self, other: &PublicKey) -> Result<PublicKey, Error>

Adds a second key to this one, returning the sum.

§Errors

If the result would be the point at infinity, i.e. adding this point to its own negation.

§Examples
use secp256k1::{rand, Secp256k1};

let secp = Secp256k1::new();
let mut rng = rand::thread_rng();
let (_, pk1) = secp.generate_keypair(&mut rng);
let (_, pk2) = secp.generate_keypair(&mut rng);
let sum = pk1.combine(&pk2).expect("It's improbable to fail for 2 random public keys");
source

pub fn combine_keys(keys: &[&PublicKey]) -> Result<PublicKey, Error>

Adds the keys in the provided slice together, returning the sum.

§Errors

Errors under any of the following conditions:

  • The result would be the point at infinity, i.e. adding a point to its own negation.
  • The provided slice is empty.
  • The number of elements in the provided slice is greater than i32::MAX.
§Examples
use secp256k1::{rand, Secp256k1, PublicKey};

let secp = Secp256k1::new();
let mut rng = rand::thread_rng();
let (_, pk1) = secp.generate_keypair(&mut rng);
let (_, pk2) = secp.generate_keypair(&mut rng);
let (_, pk3) = secp.generate_keypair(&mut rng);
let sum = PublicKey::combine_keys(&[&pk1, &pk2, &pk3]).expect("It's improbable to fail for 3 random public keys");
source

pub fn x_only_public_key(&self) -> (XOnlyPublicKey, Parity)

Returns the XOnlyPublicKey (and it’s Parity) for this PublicKey.

source

pub fn verify<C: Verification>( &self, secp: &Secp256k1<C>, msg: &Message, sig: &Signature, ) -> Result<(), Error>

Checks that sig is a valid ECDSA signature for msg using this public key.

Trait Implementations§

source§

impl CPtr for PublicKey

This trait enables interaction with the FFI layer and even though it is part of the public API normal users should never need to directly interact with FFI types.

source§

fn as_c_ptr(&self) -> *const Self::Target

Obtains a const pointer suitable for use with FFI functions.

source§

fn as_mut_c_ptr(&mut self) -> *mut Self::Target

Obtains a mutable pointer suitable for use with FFI functions.

§

type Target = PublicKey

source§

impl Clone for PublicKey

source§

fn clone(&self) -> PublicKey

Returns a copy of the value. Read more
1.0.0 · source§

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

Performs copy-assignment from source. Read more
source§

impl Debug for PublicKey

source§

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

Formats the value using the given formatter. Read more
source§

impl Display for PublicKey

source§

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

Formats the value using the given formatter. Read more
source§

impl<'a> From<&'a Keypair> for PublicKey

source§

fn from(pair: &'a Keypair) -> Self

Converts to this type from the input type.
source§

impl From<Keypair> for PublicKey

source§

fn from(pair: Keypair) -> Self

Converts to this type from the input type.
source§

impl From<PublicKey> for PublicKey

Creates a new public key from a FFI public key.

Note, normal users should never need to interact directly with FFI types.

source§

fn from(pk: PublicKey) -> PublicKey

Converts to this type from the input type.
source§

impl From<PublicKey> for XOnlyPublicKey

source§

fn from(src: PublicKey) -> XOnlyPublicKey

Converts to this type from the input type.
source§

impl FromStr for PublicKey

§

type Err = Error

The associated error which can be returned from parsing.
source§

fn from_str(s: &str) -> Result<PublicKey, Error>

Parses a string s to return a value of this type. Read more
source§

impl Hash for PublicKey

source§

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

Feeds this value into the given Hasher. Read more
1.3.0 · source§

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

Feeds a slice of this type into the given Hasher. Read more
source§

impl LowerHex for PublicKey

source§

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

Formats the value using the given formatter. Read more
source§

impl Ord for PublicKey

source§

fn cmp(&self, other: &PublicKey) -> Ordering

This method returns an Ordering between self and other. Read more
1.21.0 · source§

fn max(self, other: Self) -> Self
where Self: Sized,

Compares and returns the maximum of two values. Read more
1.21.0 · source§

fn min(self, other: Self) -> Self
where Self: Sized,

Compares and returns the minimum of two values. Read more
1.50.0 · source§

fn clamp(self, min: Self, max: Self) -> Self
where Self: Sized + PartialOrd,

Restrict a value to a certain interval. Read more
source§

impl PartialEq for PublicKey

source§

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

This method tests for self and other values to be equal, and is used by ==.
1.0.0 · source§

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

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
source§

impl PartialOrd for PublicKey

source§

fn partial_cmp(&self, other: &PublicKey) -> Option<Ordering>

This method returns an ordering between self and other values if one exists. Read more
1.0.0 · source§

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

This method tests less than (for self and other) and is used by the < operator. Read more
1.0.0 · source§

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

This method tests less than or equal to (for self and other) and is used by the <= operator. Read more
1.0.0 · source§

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

This method tests greater than (for self and other) and is used by the > operator. Read more
1.0.0 · source§

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

This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more
source§

impl Copy for PublicKey

source§

impl Eq for PublicKey

source§

impl StructuralPartialEq for PublicKey

Auto Trait Implementations§

Blanket Implementations§

source§

impl<T> Any for T
where T: 'static + ?Sized,

source§

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
source§

impl<T> Borrow<T> for T
where T: ?Sized,

source§

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
source§

impl<T> BorrowMut<T> for T
where T: ?Sized,

source§

fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
source§

impl<T> CloneToUninit for T
where T: Copy,

source§

unsafe fn clone_to_uninit(&self, dst: *mut T)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dst. Read more
source§

impl<T> CloneToUninit for T
where T: Clone,

source§

default unsafe fn clone_to_uninit(&self, dst: *mut T)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dst. Read more
source§

impl<T> From<T> for T

source§

fn from(t: T) -> T

Returns the argument unchanged.

source§

impl<T, U> Into<U> for T
where U: From<T>,

source§

fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

source§

impl<T> ToOwned for T
where T: Clone,

§

type Owned = T

The resulting type after obtaining ownership.
source§

fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
source§

fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
source§

impl<T> ToString for T
where T: Display + ?Sized,

source§

default fn to_string(&self) -> String

Converts the given value to a String. Read more
source§

impl<T, U> TryFrom<U> for T
where U: Into<T>,

§

type Error = Infallible

The type returned in the event of a conversion error.
source§

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
source§

impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

§

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
source§

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.