Merge rust-bitcoin/rust-bitcoin#957: Add API to PSBT to enable signing inputs
dd8730e14fUse new PSBT signing API in example (Tobin C. Harding)d2367fb187Add PSBT sign functionality (Tobin C. Harding)b80e5aeaabRe-order import statements (Tobin C. Harding) Pull request description: Add an API for signing inputs to the `PSBT` struct. This is work based on code in `rust-miniscript` and the API design suggestions below from @sanket1729 and @Kixunil. Please note, this adds an `unimplemented!` call for taproot inputs. ECDSA signing is complete. Includes a patch adding the psbt example from https://github.com/rust-bitcoin/rust-bitcoin/pull/940 updated to use this new api. Run `cargo run --example psbt --features=bitcoinconsensus` to test it out. ACKs for top commit: dunxen: ACKdd8730eapoelstra: ACKdd8730e14fsanket1729: reACKdd8730e14fTree-SHA512: 6345571e53cd3aa4b7ad962536da47ae03ab7c0b088107dc4104676bdb64fcf892e8fa60e0b716f3ef158d88d7058938bf267046721ccf74b2d1b092e9b9aaaa
This commit is contained in:
sanket1729
commit
fcf9bd07bc
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@ -28,27 +28,24 @@
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//! `bt listunspent`
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//!
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use std::boxed::Box;
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use std::collections::BTreeMap;
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use std::fmt;
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use std::str::FromStr;
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use bitcoin::consensus::encode;
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use bitcoin::hashes::hex::{self, FromHex};
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use bitcoin::hashes::hex::FromHex;
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use bitcoin::locktime::absolute;
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use bitcoin::secp256k1::{Secp256k1, Signing, Verification};
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use bitcoin::util::amount::ParseAmountError;
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use bitcoin::util::bip32::{
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self, ChildNumber, DerivationPath, ExtendedPrivKey, ExtendedPubKey, Fingerprint,
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IntoDerivationPath,
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ChildNumber, DerivationPath, ExtendedPrivKey, ExtendedPubKey, Fingerprint, IntoDerivationPath,
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};
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use bitcoin::util::psbt::{self, Input, Psbt, PsbtSighashType};
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use bitcoin::{
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address, Address, Amount, Network, OutPoint, PrivateKey, PublicKey, Script, Sequence,
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Transaction, TxIn, TxOut, Txid, Witness,
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Address, Amount, Network, OutPoint, PublicKey, Script, Sequence, Transaction, TxIn, TxOut,
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Txid, Witness,
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};
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use self::psbt_sign::*;
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type Result<T> = std::result::Result<T, Error>;
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// Get this from the output of `bt dumpwallet <file>`.
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@ -141,33 +138,14 @@ impl ColdStorage {
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/// Signs `psbt` with this signer.
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fn sign_psbt<C: Signing>(&self, secp: &Secp256k1<C>, mut psbt: Psbt) -> Result<Psbt> {
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let sk = self.private_key_to_sign(secp, &psbt.inputs[0])?;
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psbt_sign::sign(&mut psbt, &sk, 0, secp)?;
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Ok(psbt)
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}
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/// Returns the private key required to sign `input` if we have it.
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fn private_key_to_sign<C: Signing>(
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&self,
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secp: &Secp256k1<C>,
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input: &Input,
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) -> Result<PrivateKey> {
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match input.bip32_derivation.iter().next() {
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Some((pk, (fingerprint, path))) => {
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if *fingerprint != self.master_fingerprint() {
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return Err(Error::WrongFingerprint);
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}
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let sk = self.master_xpriv.derive_priv(secp, &path)?.to_priv();
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if *pk != sk.public_key(secp).inner {
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return Err(Error::WrongPubkey);
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}
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Ok(sk)
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match psbt.sign(&self.master_xpriv, secp) {
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Ok(keys) => assert_eq!(keys.len(), 1),
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Err((_, e)) => {
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let e = e.get(&0).expect("at least one error");
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return Err(e.clone().into());
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}
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None => Err(Error::MissingBip32Derivation),
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}
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};
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Ok(psbt)
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}
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}
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@ -247,7 +225,7 @@ impl WatchOnly {
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map.insert(pk.inner, (fingerprint, path));
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input.bip32_derivation = map;
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let ty = PsbtSighashType::from_str("SIGHASH_ALL").map_err(|_| Error::SighashTypeParse)?;
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let ty = PsbtSighashType::from_str("SIGHASH_ALL")?;
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input.sighash_type = Some(ty);
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psbt.inputs = vec![input];
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@ -260,11 +238,10 @@ impl WatchOnly {
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use bitcoin::util::psbt::serialize::Serialize;
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if psbt.inputs.is_empty() {
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return Err(Error::InputsEmpty);
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return Err(psbt::SignError::MissingInputUtxo.into());
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}
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let sigs: Vec<_> = psbt.inputs[0].partial_sigs.values().collect();
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let mut script_witness: Witness = Witness::new();
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script_witness.push(&sigs[0].serialize());
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script_witness.push(self.input_xpub.to_pub().serialize());
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@ -313,301 +290,12 @@ fn previous_output() -> TxOut {
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TxOut { value: amount.to_sat(), script_pubkey }
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}
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#[derive(Clone, Debug, PartialEq, Eq)]
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enum Error {
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/// Bip32 error.
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Bip32(bip32::Error),
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/// PSBT error.
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Psbt(psbt::Error),
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/// PSBT sighash error.
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PsbtSighash(SighashError),
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/// Bitcoin_hashes hex error.
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Hex(hex::Error),
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/// Address error.
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Address(address::Error),
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/// Parse amount error.
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ParseAmount(ParseAmountError),
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/// Parsing sighash type string failed.
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SighashTypeParse,
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/// PSBT inputs field is empty.
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InputsEmpty,
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/// BIP32 data missing.
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MissingBip32Derivation,
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/// Fingerprint does not match that in input.
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WrongFingerprint,
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/// Pubkey for derivation path does not match that in input.
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WrongPubkey,
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struct Error(Box<dyn std::error::Error>);
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impl<T: std::error::Error + 'static> From<T> for Error {
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fn from(e: T) -> Self { Error(Box::new(e)) }
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}
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impl std::error::Error for Error {
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fn source(&self) -> Option<&(dyn std::error::Error + 'static)> { None }
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}
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impl fmt::Display for Error {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { write!(f, "{:?}", self) }
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}
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impl From<bip32::Error> for Error {
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fn from(e: bip32::Error) -> Error { Error::Bip32(e) }
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}
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impl From<psbt::Error> for Error {
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fn from(e: psbt::Error) -> Error { Error::Psbt(e) }
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}
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impl From<SighashError> for Error {
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fn from(e: SighashError) -> Error { Error::PsbtSighash(e) }
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}
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impl From<hex::Error> for Error {
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fn from(e: hex::Error) -> Error { Error::Hex(e) }
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}
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impl From<address::Error> for Error {
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fn from(e: address::Error) -> Error { Error::Address(e) }
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}
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impl From<ParseAmountError> for Error {
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fn from(e: ParseAmountError) -> Error { Error::ParseAmount(e) }
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}
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/// This module implements signing a PSBT. It is based on code in `rust-miniscript` with a bit of a
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/// look at `bdk` as well. Since this example only uses ECDSA signatures the signing code is
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/// sufficient however before we can merge this into the main `rust-bitcoin` crate we need to handle
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/// taproot as well. See PR: https://github.com/rust-bitcoin/rust-bitcoin/pull/957
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///
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/// All functions that take a `psbt` argument should be implemented on `Psbt` and use `self` instead.
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mod psbt_sign {
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use std::fmt;
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use std::ops::Deref;
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use bitcoin::psbt::{Input, Prevouts, Psbt, PsbtSighashType};
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use bitcoin::sighash::{self, EcdsaSighashType, SchnorrSighashType, SighashCache};
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use bitcoin::util::taproot::TapLeafHash;
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use bitcoin::{EcdsaSig, EcdsaSigError, PrivateKey, Script, Transaction, TxOut};
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use secp256k1::{Message, Secp256k1, Signing};
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/// Signs the input at `input_index` with private key `sk`.
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pub fn sign<C: Signing>(
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psbt: &mut Psbt,
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sk: &PrivateKey,
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input_index: usize,
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secp: &Secp256k1<C>,
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) -> Result<(), SighashError> {
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check_index_is_within_bounds(psbt, input_index)?;
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let mut cache = SighashCache::new(&psbt.unsigned_tx);
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let (msg, sighash_ty) = sighash(psbt, input_index, &mut cache, None)?;
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let sig = secp.sign_ecdsa(&msg, &sk.inner);
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let mut final_signature = Vec::with_capacity(75);
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final_signature.extend_from_slice(&sig.serialize_der());
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final_signature.push(sighash_ty.to_u32() as u8);
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let pk = sk.public_key(secp);
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psbt.inputs[input_index].partial_sigs.insert(pk, EcdsaSig::from_slice(&final_signature)?);
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Ok(())
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}
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/// Returns the sighash message to sign along with the sighash type.
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fn sighash<T: Deref<Target = Transaction>>(
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psbt: &Psbt,
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input_index: usize,
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cache: &mut SighashCache<T>,
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tapleaf_hash: Option<TapLeafHash>,
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) -> Result<(Message, PsbtSighashType), SighashError> {
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check_index_is_within_bounds(psbt, input_index)?;
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let input = &psbt.inputs[input_index];
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let prevouts = prevouts(psbt)?;
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let utxo = spend_utxo(psbt, input_index)?;
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let script = utxo.script_pubkey.clone(); // scriptPubkey for input spend utxo.
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if script.is_v1_p2tr() {
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return taproot_sighash(input, prevouts, input_index, cache, tapleaf_hash);
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}
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let hash_ty = input
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.sighash_type
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.map(|ty| ty.ecdsa_hash_ty())
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.unwrap_or(Ok(EcdsaSighashType::All))
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.map_err(|_| SighashError::InvalidSighashType)?; // Only support standard sighash types.
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let is_wpkh = script.is_v0_p2wpkh();
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let is_wsh = script.is_v0_p2wsh();
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let is_nested_wpkh = script.is_p2sh()
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&& input.redeem_script.as_ref().map(|s| s.is_v0_p2wpkh()).unwrap_or(false);
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let is_nested_wsh = script.is_p2sh()
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&& input.redeem_script.as_ref().map(|x| x.is_v0_p2wsh()).unwrap_or(false);
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let is_segwit = is_wpkh || is_wsh || is_nested_wpkh || is_nested_wsh;
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let sighash = if is_segwit {
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if is_wpkh || is_nested_wpkh {
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let script_code = if is_wpkh {
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Script::p2wpkh_script_code(&script).ok_or(SighashError::NotWpkh)?
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} else {
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Script::p2wpkh_script_code(input.redeem_script.as_ref().expect("checked above"))
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.ok_or(SighashError::NotWpkh)?
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};
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cache.segwit_signature_hash(input_index, &script_code, utxo.value, hash_ty)?
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} else {
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let script_code =
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input.witness_script.as_ref().ok_or(SighashError::MissingWitnessScript)?;
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cache.segwit_signature_hash(input_index, script_code, utxo.value, hash_ty)?
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}
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} else {
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let script_code = if script.is_p2sh() {
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input.redeem_script.as_ref().ok_or(SighashError::MissingRedeemScript)?
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} else {
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&script
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};
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cache.legacy_signature_hash(input_index, script_code, hash_ty.to_u32())?
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};
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Ok((Message::from_slice(&sighash).expect("sighashes are 32 bytes"), hash_ty.into()))
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}
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/// Returns the prevouts for this PSBT.
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fn prevouts(psbt: &Psbt) -> Result<Vec<&TxOut>, SighashError> {
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let len = psbt.inputs.len();
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let mut utxos = Vec::with_capacity(len);
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for i in 0..len {
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utxos.push(spend_utxo(psbt, i)?);
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}
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Ok(utxos)
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}
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/// Returns the spending utxo for this PSBT's input at `input_index`.
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fn spend_utxo(psbt: &Psbt, input_index: usize) -> Result<&TxOut, SighashError> {
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check_index_is_within_bounds(psbt, input_index)?;
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let input = &psbt.inputs[input_index];
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let utxo = if let Some(witness_utxo) = &input.witness_utxo {
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witness_utxo
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} else if let Some(non_witness_utxo) = &input.non_witness_utxo {
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let vout = psbt.unsigned_tx.input[input_index].previous_output.vout;
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&non_witness_utxo.output[vout as usize]
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} else {
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return Err(SighashError::MissingSpendUtxo);
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};
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Ok(utxo)
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}
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/// Checks `input_index` is within bounds for the PSBT `inputs` array and
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/// for the PSBT `unsigned_tx` `input` array.
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fn check_index_is_within_bounds(psbt: &Psbt, input_index: usize) -> Result<(), SighashError> {
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if input_index >= psbt.inputs.len() {
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return Err(SighashError::IndexOutOfBounds(input_index, psbt.inputs.len()));
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}
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if input_index >= psbt.unsigned_tx.input.len() {
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return Err(SighashError::IndexOutOfBounds(input_index, psbt.unsigned_tx.input.len()));
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}
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Ok(())
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}
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/// Returns the sighash message and sighash type for this `input`.
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fn taproot_sighash<T: Deref<Target = Transaction>>(
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input: &Input,
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prevouts: Vec<&TxOut>,
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input_index: usize,
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cache: &mut SighashCache<T>,
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tapleaf_hash: Option<TapLeafHash>,
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) -> Result<(Message, PsbtSighashType), SighashError> {
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// Note that as per PSBT spec we should have access to spent utxos for the transaction. Even
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// if the transaction does not require SIGHASH_ALL, we create `Prevouts::All` for simplicity.
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let prevouts = Prevouts::All(&prevouts);
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let hash_ty = input
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.sighash_type
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.map(|ty| ty.schnorr_hash_ty())
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.unwrap_or(Ok(SchnorrSighashType::Default))
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.map_err(|_e| SighashError::InvalidSighashType)?;
|
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let sighash = match tapleaf_hash {
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Some(leaf_hash) => cache.taproot_script_spend_signature_hash(
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input_index,
|
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&prevouts,
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leaf_hash,
|
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hash_ty,
|
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)?,
|
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None => cache.taproot_key_spend_signature_hash(input_index, &prevouts, hash_ty)?,
|
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};
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let msg = Message::from_slice(&sighash).expect("sighashes are 32 bytes");
|
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Ok((msg, hash_ty.into()))
|
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}
|
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|
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/// Errors encountered while calculating the sighash message.
|
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#[derive(Debug, PartialEq, Eq, PartialOrd, Ord, Hash, Clone)]
|
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pub enum SighashError {
|
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/// Input index out of bounds (actual index, maximum index allowed).
|
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IndexOutOfBounds(usize, usize),
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/// Missing spending utxo.
|
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MissingSpendUtxo,
|
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/// Missing witness script.
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MissingWitnessScript,
|
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/// Missing Redeem script.
|
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MissingRedeemScript,
|
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/// Invalid Sighash type.
|
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InvalidSighashType,
|
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/// The `scriptPubkey` is not a P2WPKH script.
|
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NotWpkh,
|
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/// Sighash computation error.
|
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SighashComputation(sighash::Error),
|
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/// An ECDSA key-related error occurred.
|
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EcdsaSig(EcdsaSigError),
|
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}
|
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|
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impl fmt::Display for SighashError {
|
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
|
||||
match self {
|
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SighashError::IndexOutOfBounds(ind, len) => {
|
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write!(f, "index {}, psbt input len: {}", ind, len)
|
||||
}
|
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SighashError::MissingSpendUtxo => write!(f, "missing spend utxon in PSBT"),
|
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SighashError::MissingWitnessScript => write!(f, "missing witness script"),
|
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SighashError::MissingRedeemScript => write!(f, "missing redeem script"),
|
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SighashError::InvalidSighashType => write!(f, "invalid sighash type"),
|
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SighashError::NotWpkh => write!(f, "the scriptPubkey is not a P2WPKH script"),
|
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// If merged into rust-bitcoin these two should use `write_err!`.
|
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SighashError::SighashComputation(e) => write!(f, "sighash: {}", e),
|
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SighashError::EcdsaSig(e) => write!(f, "ecdsa: {}", e),
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
impl From<sighash::Error> for SighashError {
|
||||
fn from(e: sighash::Error) -> Self { SighashError::SighashComputation(e) }
|
||||
}
|
||||
|
||||
impl From<EcdsaSigError> for SighashError {
|
||||
fn from(e: EcdsaSigError) -> Self { SighashError::EcdsaSig(e) }
|
||||
}
|
||||
|
||||
#[cfg(feature = "std")]
|
||||
impl std::error::Error for SighashError {
|
||||
fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
|
||||
use self::SighashError::*;
|
||||
|
||||
match self {
|
||||
IndexOutOfBounds(_, _)
|
||||
| MissingSpendUtxo
|
||||
| MissingWitnessScript
|
||||
| MissingRedeemScript
|
||||
| InvalidSighashType
|
||||
| NotWpkh => None,
|
||||
SighashComputation(e) => Some(e),
|
||||
EcdsaSig(e) => Some(e),
|
||||
}
|
||||
}
|
||||
}
|
||||
impl fmt::Debug for Error {
|
||||
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { fmt::Debug::fmt(&self.0, f) }
|
||||
}
|
||||
|
|
|
|||
|
|
@ -7,32 +7,40 @@
|
|||
//! except we define PSBTs containing non-standard sighash types as invalid.
|
||||
//!
|
||||
|
||||
use core::cmp;
|
||||
#[cfg(feature = "std")]
|
||||
use std::collections::{HashMap, HashSet};
|
||||
|
||||
use crate::blockdata::script::Script;
|
||||
use crate::blockdata::transaction::{ TxOut, Transaction};
|
||||
use crate::consensus::{encode, Encodable, Decodable};
|
||||
pub use crate::util::sighash::Prevouts;
|
||||
use core::{fmt, cmp};
|
||||
use core::ops::Deref;
|
||||
|
||||
use secp256k1::{Message, Secp256k1, Signing};
|
||||
use bitcoin_internals::write_err;
|
||||
|
||||
use crate::prelude::*;
|
||||
|
||||
use crate::io;
|
||||
mod error;
|
||||
pub use self::error::Error;
|
||||
|
||||
pub mod raw;
|
||||
use crate::blockdata::script::Script;
|
||||
use crate::blockdata::transaction::{Transaction, TxOut};
|
||||
use crate::consensus::{encode, Encodable, Decodable};
|
||||
use crate::util::bip32::{self, ExtendedPrivKey, ExtendedPubKey, KeySource};
|
||||
use crate::util::ecdsa::{EcdsaSig, EcdsaSigError};
|
||||
use crate::util::key::{PublicKey, PrivateKey};
|
||||
use crate::util::sighash::{self, EcdsaSighashType, SighashCache};
|
||||
|
||||
pub use crate::util::sighash::Prevouts;
|
||||
|
||||
#[macro_use]
|
||||
mod macros;
|
||||
|
||||
pub mod raw;
|
||||
pub mod serialize;
|
||||
|
||||
mod error;
|
||||
pub use self::error::Error;
|
||||
|
||||
mod map;
|
||||
pub use self::map::{Input, Output, TapTree, PsbtSighashType, IncompleteTapTree};
|
||||
use self::map::Map;
|
||||
|
||||
use crate::util::bip32::{ExtendedPubKey, KeySource};
|
||||
|
||||
/// Partially signed transaction, commonly referred to as a PSBT.
|
||||
pub type Psbt = PartiallySignedTransaction;
|
||||
|
||||
|
|
@ -198,6 +206,522 @@ impl PartiallySignedTransaction {
|
|||
|
||||
Ok(())
|
||||
}
|
||||
|
||||
/// Attempts to create _all_ the required signatures for this PSBT using `k`.
|
||||
///
|
||||
/// **NOTE**: Taproot inputs are, as yet, not supported by this function. We currently only
|
||||
/// attempt to sign ECDSA inputs.
|
||||
///
|
||||
/// If you just want to sign an input with one specific key consider using `sighash_ecdsa`. This
|
||||
/// function does not support scripts that contain `OP_CODESEPARATOR`.
|
||||
///
|
||||
/// # Returns
|
||||
///
|
||||
/// Either Ok(SigningKeys) or Err((SigningKeys, SigningErrors)), where
|
||||
/// - SigningKeys: A map of input index -> pubkey associated with secret key used to sign.
|
||||
/// - SigningKeys: A map of input index -> the error encountered while attempting to sign.
|
||||
///
|
||||
/// If an error is returned some signatures may already have been added to the PSBT. Since
|
||||
/// `partial_sigs` is a [`BTreeMap`] it is safe to retry, previous sigs will be overwritten.
|
||||
pub fn sign<C, K>(
|
||||
&mut self,
|
||||
k: &K,
|
||||
secp: &Secp256k1<C>,
|
||||
) -> Result<SigningKeys, (SigningKeys, SigningErrors)>
|
||||
where
|
||||
C: Signing,
|
||||
K: GetKey,
|
||||
{
|
||||
let tx = self.unsigned_tx.clone(); // clone because we need to mutably borrow when signing.
|
||||
let mut cache = SighashCache::new(&tx);
|
||||
|
||||
let mut used = BTreeMap::new();
|
||||
let mut errors = BTreeMap::new();
|
||||
|
||||
for i in 0..self.inputs.len() {
|
||||
if let Ok(SigningAlgorithm::Ecdsa) = self.signing_algorithm(i) {
|
||||
match self.bip32_sign_ecdsa(k, i, &mut cache, secp) {
|
||||
Ok(v) => { used.insert(i, v); },
|
||||
Err(e) => { errors.insert(i, e); },
|
||||
}
|
||||
};
|
||||
}
|
||||
if errors.is_empty() {
|
||||
Ok(used)
|
||||
} else {
|
||||
Err((used, errors))
|
||||
}
|
||||
}
|
||||
|
||||
/// Attempts to create all signatures required by this PSBT's `bip32_derivation` field, adding
|
||||
/// them to `partial_sigs`.
|
||||
///
|
||||
/// # Returns
|
||||
///
|
||||
/// - Ok: A list of the public keys used in signing.
|
||||
/// - Err: Error encountered trying to calculate the sighash AND we had the signing key.
|
||||
fn bip32_sign_ecdsa<C, K, T>(
|
||||
&mut self,
|
||||
k: &K,
|
||||
input_index: usize,
|
||||
cache: &mut SighashCache<T>,
|
||||
secp: &Secp256k1<C>,
|
||||
) -> Result<Vec<PublicKey>, SignError>
|
||||
where
|
||||
C: Signing,
|
||||
T: Deref<Target=Transaction>,
|
||||
K: GetKey,
|
||||
{
|
||||
let msg_sighash_ty_res = self.sighash_ecdsa(input_index, cache);
|
||||
|
||||
let input = &mut self.inputs[input_index]; // Index checked in call to `sighash_ecdsa`.
|
||||
|
||||
let mut used = vec![]; // List of pubkeys used to sign the input.
|
||||
|
||||
for (pk, key_source) in input.bip32_derivation.iter() {
|
||||
let sk = if let Ok(Some(sk)) = k.get_key(KeyRequest::Bip32(key_source.clone()), secp) {
|
||||
sk
|
||||
} else if let Ok(Some(sk)) = k.get_key(KeyRequest::Pubkey(PublicKey::new(*pk)), secp) {
|
||||
sk
|
||||
} else {
|
||||
continue;
|
||||
};
|
||||
|
||||
// Only return the error if we have a secret key to sign this input.
|
||||
let (msg, sighash_ty) = match msg_sighash_ty_res {
|
||||
Err(e) => return Err(e),
|
||||
Ok((msg, sighash_ty)) => (msg, sighash_ty),
|
||||
};
|
||||
|
||||
let sig = EcdsaSig {
|
||||
sig: secp.sign_ecdsa(&msg, &sk.inner),
|
||||
hash_ty: sighash_ty,
|
||||
};
|
||||
|
||||
let pk = sk.public_key(secp);
|
||||
|
||||
input.partial_sigs.insert(pk, sig);
|
||||
used.push(pk);
|
||||
}
|
||||
|
||||
Ok(used)
|
||||
}
|
||||
|
||||
/// Returns the sighash message to sign an ECDSA input along with the sighash type.
|
||||
///
|
||||
/// Uses the [`EcdsaSighashType`] from this input if one is specified. If no sighash type is
|
||||
/// specified uses [`EcdsaSighashType::All`]. This function does not support scripts that
|
||||
/// contain `OP_CODESEPARATOR`.
|
||||
pub fn sighash_ecdsa<T: Deref<Target=Transaction>>(
|
||||
&self,
|
||||
input_index: usize,
|
||||
cache: &mut SighashCache<T>,
|
||||
) -> Result<(Message, EcdsaSighashType), SignError> {
|
||||
use OutputType::*;
|
||||
|
||||
if self.signing_algorithm(input_index)? != SigningAlgorithm::Ecdsa {
|
||||
return Err(SignError::WrongSigningAlgorithm);
|
||||
}
|
||||
|
||||
let input = self.checked_input(input_index)?;
|
||||
let utxo = self.spend_utxo(input_index)?;
|
||||
let spk = &utxo.script_pubkey; // scriptPubkey for input spend utxo.
|
||||
|
||||
let hash_ty = input.ecdsa_hash_ty()
|
||||
.map_err(|_| SignError::InvalidSighashType)?; // Only support standard sighash types.
|
||||
|
||||
let sighash = match self.output_type(input_index)? {
|
||||
Bare => {
|
||||
cache.legacy_signature_hash(input_index, spk, hash_ty.to_u32())?
|
||||
},
|
||||
Sh => {
|
||||
let script_code = input.redeem_script.as_ref().ok_or(SignError::MissingRedeemScript)?;
|
||||
cache.legacy_signature_hash(input_index, script_code, hash_ty.to_u32())?
|
||||
},
|
||||
Wpkh => {
|
||||
let script_code = Script::p2wpkh_script_code(spk).ok_or(SignError::NotWpkh)?;
|
||||
cache.segwit_signature_hash(input_index, &script_code, utxo.value, hash_ty)?
|
||||
}
|
||||
ShWpkh => {
|
||||
let script_code = Script::p2wpkh_script_code(input.redeem_script.as_ref().expect("checked above"))
|
||||
.ok_or(SignError::NotWpkh)?;
|
||||
cache.segwit_signature_hash(input_index, &script_code, utxo.value, hash_ty)?
|
||||
},
|
||||
Wsh | ShWsh => {
|
||||
let script_code = input.witness_script.as_ref().ok_or(SignError::MissingWitnessScript)?;
|
||||
cache.segwit_signature_hash(input_index, script_code, utxo.value, hash_ty)?
|
||||
},
|
||||
Tr => {
|
||||
// This PSBT signing API is WIP, taproot to come shortly.
|
||||
return Err(SignError::Unsupported);
|
||||
}
|
||||
};
|
||||
|
||||
Ok((Message::from_slice(&sighash).expect("sighashes are 32 bytes"), hash_ty))
|
||||
}
|
||||
|
||||
/// Returns the spending utxo for this PSBT's input at `input_index`.
|
||||
pub fn spend_utxo(&self, input_index: usize) -> Result<&TxOut, SignError> {
|
||||
let input = self.checked_input(input_index)?;
|
||||
let utxo = if let Some(witness_utxo) = &input.witness_utxo {
|
||||
witness_utxo
|
||||
} else if let Some(non_witness_utxo) = &input.non_witness_utxo {
|
||||
let vout = self.unsigned_tx.input[input_index].previous_output.vout;
|
||||
&non_witness_utxo.output[vout as usize]
|
||||
} else {
|
||||
return Err(SignError::MissingSpendUtxo);
|
||||
};
|
||||
Ok(utxo)
|
||||
}
|
||||
|
||||
/// Gets the input at `input_index` after checking that it is a valid index.
|
||||
fn checked_input(&self, input_index: usize) -> Result<&Input, SignError> {
|
||||
self.check_index_is_within_bounds(input_index)?;
|
||||
Ok(&self.inputs[input_index])
|
||||
}
|
||||
|
||||
/// Checks `input_index` is within bounds for the PSBT `inputs` array and
|
||||
/// for the PSBT `unsigned_tx` `input` array.
|
||||
fn check_index_is_within_bounds(&self, input_index: usize) -> Result<(), SignError> {
|
||||
if input_index >= self.inputs.len() {
|
||||
return Err(SignError::IndexOutOfBounds(input_index, self.inputs.len()));
|
||||
}
|
||||
|
||||
if input_index >= self.unsigned_tx.input.len() {
|
||||
return Err(SignError::IndexOutOfBounds(input_index, self.unsigned_tx.input.len()));
|
||||
}
|
||||
|
||||
Ok(())
|
||||
}
|
||||
|
||||
/// Returns the algorithm used to sign this PSBT's input at `input_index`.
|
||||
fn signing_algorithm(&self, input_index: usize) -> Result<SigningAlgorithm, SignError> {
|
||||
let output_type = self.output_type(input_index)?;
|
||||
Ok(output_type.signing_algorithm())
|
||||
}
|
||||
|
||||
/// Returns the [`OutputType`] of the spend utxo for this PBST's input at `input_index`.
|
||||
fn output_type(&self, input_index: usize) -> Result<OutputType, SignError> {
|
||||
let input = self.checked_input(input_index)?;
|
||||
let utxo = self.spend_utxo(input_index)?;
|
||||
let spk = utxo.script_pubkey.clone();
|
||||
|
||||
// Anything that is not segwit and is not p2sh is `Bare`.
|
||||
if !(spk.is_witness_program() || spk.is_p2sh()) {
|
||||
return Ok(OutputType::Bare);
|
||||
}
|
||||
|
||||
if spk.is_v0_p2wpkh() {
|
||||
return Ok(OutputType::Wpkh);
|
||||
}
|
||||
|
||||
if spk.is_v0_p2wsh() {
|
||||
return Ok(OutputType::Wsh);
|
||||
}
|
||||
|
||||
if spk.is_p2sh() {
|
||||
if input.redeem_script.as_ref().map(|s| s.is_v0_p2wpkh()).unwrap_or(false) {
|
||||
return Ok(OutputType::ShWpkh);
|
||||
}
|
||||
if input.redeem_script.as_ref().map(|x| x.is_v0_p2wsh()).unwrap_or(false) {
|
||||
return Ok(OutputType::ShWsh);
|
||||
}
|
||||
return Ok(OutputType::Sh);
|
||||
}
|
||||
|
||||
if spk.is_v1_p2tr() {
|
||||
return Ok(OutputType::Tr);
|
||||
}
|
||||
|
||||
// Something is wrong with the input scriptPubkey or we do not know how to sign
|
||||
// because there has been a new softfork that we do not yet support.
|
||||
Err(SignError::UnknownOutputType)
|
||||
}
|
||||
}
|
||||
|
||||
/// Data required to call [`GetKey`] to get the private key to sign an input.
|
||||
#[derive(Clone, Debug, PartialEq, Eq)]
|
||||
#[non_exhaustive]
|
||||
pub enum KeyRequest {
|
||||
/// Request a private key using the associated public key.
|
||||
Pubkey(PublicKey),
|
||||
/// Request a private key using BIP-32 fingerprint and derivation path.
|
||||
Bip32(KeySource),
|
||||
}
|
||||
|
||||
/// Trait to get a private key from a key request, key is then used to sign an input.
|
||||
pub trait GetKey {
|
||||
/// An error occurred while getting the key.
|
||||
type Error: core::fmt::Debug;
|
||||
|
||||
/// Attempts to get the private key for `key_request`.
|
||||
///
|
||||
/// # Returns
|
||||
/// - `Some(key)` if the key is found.
|
||||
/// - `None` if the key was not found but no error was encountered.
|
||||
/// - `Err` if an error was encountered while looking for the key.
|
||||
fn get_key<C: Signing>(&self, key_request: KeyRequest, secp: &Secp256k1<C>) -> Result<Option<PrivateKey>, Self::Error>;
|
||||
}
|
||||
|
||||
impl GetKey for ExtendedPrivKey {
|
||||
type Error = GetKeyError;
|
||||
|
||||
fn get_key<C: Signing>(&self, key_request: KeyRequest, secp: &Secp256k1<C>) -> Result<Option<PrivateKey>, Self::Error> {
|
||||
match key_request {
|
||||
KeyRequest::Pubkey(_) => Err(GetKeyError::NotSupported),
|
||||
KeyRequest::Bip32((fingerprint, path)) => {
|
||||
let key = if self.fingerprint(secp) == fingerprint {
|
||||
let k = self.derive_priv(secp, &path)?;
|
||||
Some(k.to_priv())
|
||||
} else {
|
||||
None
|
||||
};
|
||||
Ok(key)
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/// Map of input index -> pubkey associated with secret key used to create signature for that input.
|
||||
pub type SigningKeys = BTreeMap<usize, Vec<PublicKey>>;
|
||||
|
||||
/// Map of input index -> the error encountered while attempting to sign that input.
|
||||
pub type SigningErrors = BTreeMap<usize, SignError>;
|
||||
|
||||
#[rustfmt::skip]
|
||||
macro_rules! impl_get_key_for_set {
|
||||
($set:ident) => {
|
||||
|
||||
impl GetKey for $set<ExtendedPrivKey> {
|
||||
type Error = GetKeyError;
|
||||
|
||||
fn get_key<C: Signing>(
|
||||
&self,
|
||||
key_request: KeyRequest,
|
||||
secp: &Secp256k1<C>
|
||||
) -> Result<Option<PrivateKey>, Self::Error> {
|
||||
match key_request {
|
||||
KeyRequest::Pubkey(_) => Err(GetKeyError::NotSupported),
|
||||
KeyRequest::Bip32((fingerprint, path)) => {
|
||||
for xpriv in self.iter() {
|
||||
if xpriv.parent_fingerprint == fingerprint {
|
||||
let k = xpriv.derive_priv(secp, &path)?;
|
||||
return Ok(Some(k.to_priv()));
|
||||
}
|
||||
}
|
||||
Ok(None)
|
||||
}
|
||||
}
|
||||
}
|
||||
}}}
|
||||
impl_get_key_for_set!(BTreeSet);
|
||||
#[cfg(feature = "std")]
|
||||
impl_get_key_for_set!(HashSet);
|
||||
|
||||
#[rustfmt::skip]
|
||||
macro_rules! impl_get_key_for_map {
|
||||
($map:ident) => {
|
||||
|
||||
impl GetKey for $map<PublicKey, PrivateKey> {
|
||||
type Error = GetKeyError;
|
||||
|
||||
fn get_key<C: Signing>(
|
||||
&self,
|
||||
key_request: KeyRequest,
|
||||
_: &Secp256k1<C>,
|
||||
) -> Result<Option<PrivateKey>, Self::Error> {
|
||||
match key_request {
|
||||
KeyRequest::Pubkey(pk) => Ok(self.get(&pk).cloned()),
|
||||
KeyRequest::Bip32(_) => Err(GetKeyError::NotSupported),
|
||||
}
|
||||
}
|
||||
}}}
|
||||
impl_get_key_for_map!(BTreeMap);
|
||||
#[cfg(feature = "std")]
|
||||
impl_get_key_for_map!(HashMap);
|
||||
|
||||
/// Errors when getting a key.
|
||||
#[derive(Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Debug)]
|
||||
#[non_exhaustive]
|
||||
pub enum GetKeyError {
|
||||
/// A bip32 error.
|
||||
Bip32(bip32::Error),
|
||||
/// The GetKey operation is not supported for this key request.
|
||||
NotSupported,
|
||||
}
|
||||
|
||||
impl fmt::Display for GetKeyError {
|
||||
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
|
||||
use GetKeyError::*;
|
||||
|
||||
match *self {
|
||||
Bip32(ref e) => write_err!(f, "a bip23 error"; e),
|
||||
NotSupported => f.write_str("the GetKey operation is not supported for this key request"),
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
#[cfg(feature = "std")]
|
||||
#[cfg_attr(docsrs, doc(cfg(feature = "std")))]
|
||||
impl std::error::Error for GetKeyError {
|
||||
fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
|
||||
use GetKeyError::*;
|
||||
|
||||
match *self {
|
||||
NotSupported => None,
|
||||
Bip32(ref e) => Some(e),
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
impl From<bip32::Error> for GetKeyError {
|
||||
fn from(e: bip32::Error) -> Self {
|
||||
GetKeyError::Bip32(e)
|
||||
}
|
||||
}
|
||||
|
||||
/// The various output types supported by the Bitcoin network.
|
||||
#[derive(Clone, Copy, Debug, PartialEq, Eq, PartialOrd, Ord, Hash)]
|
||||
#[non_exhaustive]
|
||||
pub enum OutputType {
|
||||
/// An output of type: pay-to-pubkey or pay-to-pubkey-hash.
|
||||
Bare,
|
||||
/// A pay-to-witness-pubkey-hash output (P2WPKH).
|
||||
Wpkh,
|
||||
/// A pay-to-witness-script-hash output (P2WSH).
|
||||
Wsh,
|
||||
/// A nested segwit output, pay-to-witness-pubkey-hash nested in a pay-to-script-hash.
|
||||
ShWpkh,
|
||||
/// A nested segwit output, pay-to-witness-script-hash nested in a pay-to-script-hash.
|
||||
ShWsh,
|
||||
/// A pay-to-script-hash output excluding wrapped segwit (P2SH).
|
||||
Sh,
|
||||
/// A taproot output (P2TR).
|
||||
Tr,
|
||||
}
|
||||
|
||||
impl OutputType {
|
||||
/// The signing algorithm used to sign this output type.
|
||||
pub fn signing_algorithm(&self) -> SigningAlgorithm {
|
||||
use OutputType::*;
|
||||
|
||||
match self {
|
||||
Bare | Wpkh | Wsh | ShWpkh | ShWsh | Sh => SigningAlgorithm::Ecdsa,
|
||||
Tr => SigningAlgorithm::Schnorr,
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/// Signing algorithms supported by the Bitcoin network.
|
||||
#[derive(Clone, Copy, Debug, PartialEq, Eq, PartialOrd, Ord, Hash)]
|
||||
pub enum SigningAlgorithm {
|
||||
/// The Elliptic Curve Digital Signature Algorithm (see [wikipedia]).
|
||||
///
|
||||
/// [wikipedia]: https://en.wikipedia.org/wiki/Elliptic_Curve_Digital_Signature_Algorithm
|
||||
Ecdsa,
|
||||
/// The Schnorr signature algorithm (see [wikipedia]).
|
||||
///
|
||||
/// [wikipedia]: https://en.wikipedia.org/wiki/Schnorr_signature
|
||||
Schnorr,
|
||||
}
|
||||
|
||||
/// Errors encountered while calculating the sighash message.
|
||||
#[derive(Debug, PartialEq, Eq, PartialOrd, Ord, Hash, Clone)]
|
||||
pub enum SignError {
|
||||
/// An ECDSA key-related error occurred.
|
||||
EcdsaSig(EcdsaSigError),
|
||||
/// Input index out of bounds (actual index, maximum index allowed).
|
||||
IndexOutOfBounds(usize, usize),
|
||||
/// Invalid Sighash type.
|
||||
InvalidSighashType,
|
||||
/// Missing input utxo.
|
||||
MissingInputUtxo,
|
||||
/// Missing Redeem script.
|
||||
MissingRedeemScript,
|
||||
/// Missing spending utxo.
|
||||
MissingSpendUtxo,
|
||||
/// Missing witness script.
|
||||
MissingWitnessScript,
|
||||
/// Signing algorithm and key type does not match.
|
||||
MismatchedAlgoKey,
|
||||
/// Attempted to ECDSA sign an non-ECDSA input.
|
||||
NotEcdsa,
|
||||
/// The `scriptPubkey` is not a P2WPKH script.
|
||||
NotWpkh,
|
||||
/// Sighash computation error.
|
||||
SighashComputation(sighash::Error),
|
||||
/// Unable to determine the output type.
|
||||
UnknownOutputType,
|
||||
/// Unable to find key.
|
||||
KeyNotFound,
|
||||
/// Attempt to sign an input with the wrong signing algorithm.
|
||||
WrongSigningAlgorithm,
|
||||
/// Signing request currently unsupported.
|
||||
Unsupported
|
||||
}
|
||||
|
||||
impl fmt::Display for SignError {
|
||||
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
|
||||
use self::SignError::*;
|
||||
|
||||
match *self {
|
||||
IndexOutOfBounds(ind, len) => {
|
||||
write!(f, "index {}, psbt input len: {}", ind, len)
|
||||
}
|
||||
InvalidSighashType => write!(f, "invalid sighash type"),
|
||||
MissingInputUtxo => write!(f, "missing input utxo in PBST"),
|
||||
MissingRedeemScript => write!(f, "missing redeem script"),
|
||||
MissingSpendUtxo => write!(f, "missing spend utxo in PSBT"),
|
||||
MissingWitnessScript => write!(f, "missing witness script"),
|
||||
MismatchedAlgoKey => write!(f, "signing algorithm and key type does not match"),
|
||||
NotEcdsa => write!(f, "attempted to ECDSA sign an non-ECDSA input"),
|
||||
NotWpkh => write!(f, "the scriptPubkey is not a P2WPKH script"),
|
||||
SighashComputation(e) => write!(f, "sighash: {}", e),
|
||||
EcdsaSig(ref e) => write_err!(f, "ecdsa signature"; e),
|
||||
UnknownOutputType => write!(f, "unable to determine the output type"),
|
||||
KeyNotFound => write!(f, "unable to find key"),
|
||||
WrongSigningAlgorithm => write!(f, "attempt to sign an input with the wrong signing algorithm"),
|
||||
Unsupported => write!(f, "signing request currently unsupported"),
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
#[cfg(feature = "std")]
|
||||
#[cfg_attr(docsrs, doc(cfg(feature = "std")))]
|
||||
impl std::error::Error for SignError {
|
||||
fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
|
||||
use self::SignError::*;
|
||||
|
||||
match *self {
|
||||
IndexOutOfBounds(_, _)
|
||||
| InvalidSighashType
|
||||
| MissingInputUtxo
|
||||
| MissingRedeemScript
|
||||
| MissingSpendUtxo
|
||||
| MissingWitnessScript
|
||||
| MismatchedAlgoKey
|
||||
| NotEcdsa
|
||||
| NotWpkh
|
||||
| UnknownOutputType
|
||||
| KeyNotFound
|
||||
| WrongSigningAlgorithm
|
||||
| Unsupported => None,
|
||||
EcdsaSig(ref e) => Some(e),
|
||||
SighashComputation(ref e) => Some(e),
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
impl From<sighash::Error> for SignError {
|
||||
fn from(e: sighash::Error) -> Self {
|
||||
SignError::SighashComputation(e)
|
||||
}
|
||||
}
|
||||
|
||||
impl From<EcdsaSigError> for SignError {
|
||||
fn from(e: EcdsaSigError) -> Self {
|
||||
SignError::EcdsaSig(e)
|
||||
}
|
||||
}
|
||||
|
||||
#[cfg(feature = "base64")]
|
||||
|
|
@ -341,6 +865,8 @@ mod tests {
|
|||
use crate::hash_types::Txid;
|
||||
|
||||
use secp256k1::{Secp256k1, self};
|
||||
#[cfg(feature = "rand")]
|
||||
use secp256k1::{All, SecretKey};
|
||||
|
||||
use crate::blockdata::script::Script;
|
||||
use crate::blockdata::transaction::{Transaction, TxIn, TxOut, OutPoint, Sequence};
|
||||
|
|
@ -1137,4 +1663,74 @@ mod tests {
|
|||
|
||||
assert_eq!(psbt1, psbt2);
|
||||
}
|
||||
|
||||
#[cfg(feature = "rand")]
|
||||
fn gen_keys() -> (PrivateKey, PublicKey, Secp256k1<All>) {
|
||||
use secp256k1::rand::thread_rng;
|
||||
|
||||
let secp = Secp256k1::new();
|
||||
|
||||
let sk = SecretKey::new(&mut thread_rng());
|
||||
let priv_key = PrivateKey::new(sk, crate::Network::Regtest);
|
||||
let pk = PublicKey::from_private_key(&secp, &priv_key);
|
||||
|
||||
(priv_key, pk, secp)
|
||||
}
|
||||
|
||||
#[test]
|
||||
#[cfg(feature = "rand")]
|
||||
fn get_key_btree_map() {
|
||||
let (priv_key, pk, secp) = gen_keys();
|
||||
|
||||
let mut key_map = BTreeMap::new();
|
||||
key_map.insert(pk, priv_key);
|
||||
|
||||
let got = key_map.get_key(KeyRequest::Pubkey(pk), &secp).expect("failed to get key");
|
||||
assert_eq!(got.unwrap(), priv_key)
|
||||
}
|
||||
|
||||
#[test]
|
||||
#[cfg(feature = "rand")]
|
||||
fn sign_psbt() {
|
||||
use crate::WPubkeyHash;
|
||||
use crate::util::bip32::{Fingerprint, DerivationPath};
|
||||
|
||||
let unsigned_tx = Transaction {
|
||||
version: 2,
|
||||
lock_time: absolute::PackedLockTime::ZERO,
|
||||
input: vec![TxIn::default(), TxIn::default()],
|
||||
output: vec![TxOut::default()],
|
||||
};
|
||||
let mut psbt = PartiallySignedTransaction::from_unsigned_tx(unsigned_tx).unwrap();
|
||||
|
||||
let (priv_key, pk, secp) = gen_keys();
|
||||
|
||||
// key_map implements `GetKey` using KeyRequest::Pubkey. A pubkey key request does not use
|
||||
// keysource so we use default `KeySource` (fingreprint and derivation path) below.
|
||||
let mut key_map = BTreeMap::new();
|
||||
key_map.insert(pk, priv_key);
|
||||
|
||||
// First input we can spend. See comment above on key_map for why we use defaults here.
|
||||
let txout_wpkh = TxOut{
|
||||
value: 10,
|
||||
script_pubkey: Script::new_v0_p2wpkh(&WPubkeyHash::hash(&pk.to_bytes())),
|
||||
};
|
||||
psbt.inputs[0].witness_utxo = Some(txout_wpkh);
|
||||
|
||||
let mut map = BTreeMap::new();
|
||||
map.insert(pk.inner, (Fingerprint::default(), DerivationPath::default()));
|
||||
psbt.inputs[0].bip32_derivation = map;
|
||||
|
||||
// Second input is unspendable by us e.g., from another wallet that supports future upgrades.
|
||||
let txout_unknown_future = TxOut{
|
||||
value: 10,
|
||||
script_pubkey: Script::new_witness_program(crate::address::WitnessVersion::V4, &[0xaa; 34]),
|
||||
};
|
||||
psbt.inputs[1].witness_utxo = Some(txout_unknown_future);
|
||||
|
||||
let sigs = psbt.sign(&key_map, &secp).unwrap();
|
||||
|
||||
assert!(sigs.len() == 1);
|
||||
assert!(sigs[&0] == vec![pk]);
|
||||
}
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue