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Add conversions for TweakedKeyPair -> TweakedPublicKey 

It is trivially possible to get `TweakedPublicKey` from a
`TweakedKeyPair`, add conversion methods for doing so.
This commit is contained in:
Tobin C. Harding 2023-01-23 14:07:50 +11:00
parent 2407f241e4
commit facaefc49c
1 changed files with 35 additions and 0 deletions
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35
bitcoin/src/crypto/schnorr.rs
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@ -44,6 +44,20 @@ impl fmt::Display for TweakedPublicKey {
pub type UntweakedKeyPair = KeyPair;
/// Tweaked BIP-340 key pair
///
/// # Examples
/// ```
/// # #[cfg(feature = "rand-std")] {
/// # use bitcoin::schnorr::{TweakedKeyPair, TweakedPublicKey};
/// # use bitcoin::secp256k1::{rand, Secp256k1};
/// # let secp = Secp256k1::new();
/// # let keypair = TweakedKeyPair::dangerous_assume_tweaked(KeyPair::new(&secp, &mut rand::thread_rng()));
/// // There are various conversion methods available to get a tweaked pubkey from a tweaked keypair.
/// let (_pk, _parity) = keypair.public_parts();
/// let _pk = TweakedPublicKey::from_keypair(keypair);
/// let _pk = TweakedPublicKey::from(keypair);
/// # }
/// ```
#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Debug)]
#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
#[cfg_attr(feature = "serde", serde(crate = "actual_serde"))]
@ -136,6 +150,13 @@ impl TapTweak for UntweakedKeyPair {
}
impl TweakedPublicKey {
/// Returns the [`TweakedPublicKey`] for `keypair`.
#[inline]
pub fn from_keypair(keypair: TweakedKeyPair) -> Self {
let (xonly, _parity) = keypair.0.x_only_public_key();
TweakedPublicKey(xonly)
}
/// Creates a new [`TweakedPublicKey`] from a [`XOnlyPublicKey`]. No tweak is applied, consider
/// calling `tap_tweak` on an [`UntweakedPublicKey`] instead of using this constructor.
///
@ -176,6 +197,13 @@ impl TweakedKeyPair {
pub fn to_inner(self) -> KeyPair {
self.0
}
/// Returns the [`TweakedPublicKey`] and its [`Parity`] for this [`TweakedKeyPair`].
#[inline]
pub fn public_parts(&self) -> (TweakedPublicKey, Parity) {
let (xonly, parity) = self.0.x_only_public_key();
(TweakedPublicKey(xonly), parity)
}
}
impl From<TweakedPublicKey> for XOnlyPublicKey {
@ -192,6 +220,13 @@ impl From<TweakedKeyPair> for KeyPair {
}
}
impl From<TweakedKeyPair> for TweakedPublicKey {
#[inline]
fn from(pair: TweakedKeyPair) -> Self {
TweakedPublicKey::from_keypair(pair)
}
}
/// A BIP340-341 serialized schnorr signature with the corresponding hash type.
#[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]