105 lines
3.4 KiB
Rust
105 lines
3.4 KiB
Rust
// SPDX-License-Identifier: CC0-1.0
|
|
|
|
//! Bitcoin taproot keys.
|
|
//!
|
|
//! This module provides taproot keys used in Bitcoin (including reexporting secp256k1 keys).
|
|
//!
|
|
|
|
use core::fmt;
|
|
|
|
use internals::write_err;
|
|
pub use secp256k1::{self, constants, KeyPair, Parity, Secp256k1, Verification, XOnlyPublicKey};
|
|
|
|
use crate::prelude::*;
|
|
use crate::sighash::{InvalidSighashTypeError, TapSighashType};
|
|
|
|
/// A BIP340-341 serialized taproot signature with the corresponding hash type.
|
|
#[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
|
|
#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
|
|
#[cfg_attr(feature = "serde", serde(crate = "actual_serde"))]
|
|
pub struct Signature {
|
|
/// The underlying schnorr signature
|
|
pub sig: secp256k1::schnorr::Signature,
|
|
/// The corresponding hash type
|
|
pub hash_ty: TapSighashType,
|
|
}
|
|
|
|
impl Signature {
|
|
/// Deserialize from slice
|
|
pub fn from_slice(sl: &[u8]) -> Result<Self, SigFromSliceError> {
|
|
match sl.len() {
|
|
64 => {
|
|
// default type
|
|
let sig = secp256k1::schnorr::Signature::from_slice(sl)?;
|
|
Ok(Signature { sig, hash_ty: TapSighashType::Default })
|
|
}
|
|
65 => {
|
|
let (hash_ty, sig) = sl.split_last().expect("Slice len checked == 65");
|
|
let hash_ty = TapSighashType::from_consensus_u8(*hash_ty)?;
|
|
let sig = secp256k1::schnorr::Signature::from_slice(sig)?;
|
|
Ok(Signature { sig, hash_ty })
|
|
}
|
|
len => Err(SigFromSliceError::InvalidSignatureSize(len)),
|
|
}
|
|
}
|
|
|
|
/// Serialize Signature
|
|
pub fn to_vec(self) -> Vec<u8> {
|
|
// TODO: add support to serialize to a writer to SerializedSig
|
|
let mut ser_sig = self.sig.as_ref().to_vec();
|
|
if self.hash_ty == TapSighashType::Default {
|
|
// default sighash type, don't add extra sighash byte
|
|
} else {
|
|
ser_sig.push(self.hash_ty as u8);
|
|
}
|
|
ser_sig
|
|
}
|
|
}
|
|
|
|
/// An error constructing a [`taproot::Signature`] from a byte slice.
|
|
///
|
|
/// [`taproot::Signature`]: crate::crypto::taproot::Signature
|
|
#[derive(Debug, Clone, PartialEq, Eq)]
|
|
#[non_exhaustive]
|
|
pub enum SigFromSliceError {
|
|
/// Invalid signature hash type.
|
|
SighashType(InvalidSighashTypeError),
|
|
/// A secp256k1 error.
|
|
Secp256k1(secp256k1::Error),
|
|
/// Invalid taproot signature size
|
|
InvalidSignatureSize(usize),
|
|
}
|
|
|
|
impl fmt::Display for SigFromSliceError {
|
|
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
|
|
use SigFromSliceError::*;
|
|
|
|
match *self {
|
|
SighashType(ref e) => write_err!(f, "sighash"; e),
|
|
Secp256k1(ref e) => write_err!(f, "secp256k1"; e),
|
|
InvalidSignatureSize(sz) => write!(f, "invalid taproot signature size: {}", sz),
|
|
}
|
|
}
|
|
}
|
|
|
|
#[cfg(feature = "std")]
|
|
impl std::error::Error for SigFromSliceError {
|
|
fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
|
|
use SigFromSliceError::*;
|
|
|
|
match self {
|
|
Secp256k1(e) => Some(e),
|
|
SighashType(e) => Some(e),
|
|
InvalidSignatureSize(_) => None,
|
|
}
|
|
}
|
|
}
|
|
|
|
impl From<secp256k1::Error> for SigFromSliceError {
|
|
fn from(e: secp256k1::Error) -> Self { Self::Secp256k1(e) }
|
|
}
|
|
|
|
impl From<InvalidSighashTypeError> for SigFromSliceError {
|
|
fn from(err: InvalidSighashTypeError) -> Self { Self::SighashType(err) }
|
|
}
|