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btc.rs
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btc.rs
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//! Functions and methods related to Bitcoin.
use crate::runtime::Runtime;
use crate::error::Error;
use crate::pb::{self, request::Request, response::Response};
use crate::Keypath;
use crate::PairedBitBox;
pub use bitcoin::{
bip32::{Fingerprint, Xpub},
blockdata::script::witness_version::WitnessVersion,
};
#[cfg(feature = "wasm")]
use enum_assoc::Assoc;
#[cfg(feature = "wasm")]
pub(crate) fn serde_deserialize_simple_type<'de, D>(deserializer: D) -> Result<i32, D::Error>
where
D: serde::Deserializer<'de>,
{
use serde::Deserialize;
Ok(pb::btc_script_config::SimpleType::deserialize(deserializer)?.into())
}
#[cfg(feature = "wasm")]
#[derive(serde::Deserialize)]
pub(crate) struct SerdeScriptConfig(pb::btc_script_config::Config);
#[cfg(feature = "wasm")]
impl From<SerdeScriptConfig> for pb::BtcScriptConfig {
fn from(value: SerdeScriptConfig) -> Self {
pb::BtcScriptConfig {
config: Some(value.0),
}
}
}
#[derive(Clone, Debug, PartialEq)]
pub struct PrevTxInput {
pub prev_out_hash: Vec<u8>,
pub prev_out_index: u32,
pub signature_script: Vec<u8>,
pub sequence: u32,
}
impl From<&bitcoin::TxIn> for PrevTxInput {
fn from(value: &bitcoin::TxIn) -> Self {
PrevTxInput {
prev_out_hash: (value.previous_output.txid.as_ref() as &[u8]).to_vec(),
prev_out_index: value.previous_output.vout,
signature_script: value.script_sig.as_bytes().to_vec(),
sequence: value.sequence.to_consensus_u32(),
}
}
}
#[derive(Clone, Debug, PartialEq)]
pub struct PrevTxOutput {
pub value: u64,
pub pubkey_script: Vec<u8>,
}
impl From<&bitcoin::TxOut> for PrevTxOutput {
fn from(value: &bitcoin::TxOut) -> Self {
PrevTxOutput {
value: value.value.to_sat(),
pubkey_script: value.script_pubkey.as_bytes().to_vec(),
}
}
}
#[derive(Clone, Debug, PartialEq)]
pub struct PrevTx {
pub version: u32,
pub inputs: Vec<PrevTxInput>,
pub outputs: Vec<PrevTxOutput>,
pub locktime: u32,
}
impl From<&bitcoin::Transaction> for PrevTx {
fn from(value: &bitcoin::Transaction) -> Self {
PrevTx {
version: value.version.0 as _,
inputs: value.input.iter().map(PrevTxInput::from).collect(),
outputs: value.output.iter().map(PrevTxOutput::from).collect(),
locktime: value.lock_time.to_consensus_u32(),
}
}
}
#[derive(Debug, PartialEq)]
pub struct TxInput {
pub prev_out_hash: Vec<u8>,
pub prev_out_index: u32,
pub prev_out_value: u64,
pub sequence: u32,
pub keypath: Keypath,
pub script_config_index: u32,
// Can be None if all transaction inputs are Taproot.
pub prev_tx: Option<PrevTx>,
}
#[derive(Debug, PartialEq)]
pub struct TxInternalOutput {
pub keypath: Keypath,
pub value: u64,
pub script_config_index: u32,
}
#[derive(Debug, PartialEq)]
pub struct Payload {
pub data: Vec<u8>,
pub output_type: pb::BtcOutputType,
}
#[derive(thiserror::Error, Debug)]
pub enum PayloadError {
#[error("{0}")]
AddressError(#[from] bitcoin::address::Error),
#[error("invalid witness program size")]
InvalidWitnessProgramSize,
#[error("witness version {0} not supported yet")]
UnsupportedWitnessVersion(WitnessVersion),
#[error("unrecognized pubkey script")]
Unrecognized,
}
impl TryFrom<bitcoin::address::Payload> for Payload {
type Error = PayloadError;
fn try_from(value: bitcoin::address::Payload) -> Result<Self, Self::Error> {
match value {
bitcoin::address::Payload::PubkeyHash(h) => Ok(Payload {
data: h[..].to_vec(),
output_type: pb::BtcOutputType::P2pkh,
}),
bitcoin::address::Payload::ScriptHash(h) => Ok(Payload {
data: h[..].to_vec(),
output_type: pb::BtcOutputType::P2sh,
}),
bitcoin::address::Payload::WitnessProgram(w) => match w.version() {
WitnessVersion::V0 => Ok(Payload {
data: w.program().as_bytes().to_vec(),
output_type: match w.program().len() {
20 => pb::BtcOutputType::P2wpkh,
32 => pb::BtcOutputType::P2wsh,
_ => return Err(PayloadError::InvalidWitnessProgramSize),
},
}),
WitnessVersion::V1 => match w.program().len() {
32 => Ok(Payload {
data: w.program().as_bytes().to_vec(),
output_type: pb::BtcOutputType::P2tr,
}),
_ => Err(PayloadError::InvalidWitnessProgramSize),
},
version => Err(PayloadError::UnsupportedWitnessVersion(version)),
},
_ => Err(PayloadError::Unrecognized),
}
}
}
impl Payload {
pub fn from_pkscript(pkscript: &[u8]) -> Result<Payload, PayloadError> {
let payload =
bitcoin::address::Payload::from_script(bitcoin::Script::from_bytes(pkscript))?;
payload.try_into()
}
}
#[derive(Debug, PartialEq)]
pub struct TxExternalOutput {
pub payload: Payload,
pub value: u64,
}
impl TryFrom<&bitcoin::TxOut> for TxExternalOutput {
type Error = PsbtError;
fn try_from(value: &bitcoin::TxOut) -> Result<Self, Self::Error> {
Ok(TxExternalOutput {
payload: Payload::from_pkscript(value.script_pubkey.as_bytes())
.map_err(|_| PsbtError::UnknownOutputType)?,
value: value.value.to_sat(),
})
}
}
#[derive(Debug, PartialEq)]
pub enum TxOutput {
Internal(TxInternalOutput),
External(TxExternalOutput),
}
#[derive(Debug, PartialEq)]
pub struct Transaction {
pub script_configs: Vec<pb::BtcScriptConfigWithKeypath>,
pub version: u32,
pub inputs: Vec<TxInput>,
pub outputs: Vec<TxOutput>,
pub locktime: u32,
}
// See https://github.com/spesmilo/electrum/blob/84dc181b6e7bb20e88ef6b98fb8925c5f645a765/electrum/ecc.py#L521-L523
#[derive(Debug, PartialEq, serde::Serialize)]
#[serde(rename_all = "camelCase")]
pub struct SignMessageSignature {
pub sig: Vec<u8>,
pub recid: u8,
pub electrum_sig65: Vec<u8>,
}
#[derive(thiserror::Error, Debug)]
#[cfg_attr(feature = "wasm", derive(Assoc), func(pub const fn js_code(&self) -> &'static str))]
pub enum PsbtError {
#[error("{0}")]
#[cfg_attr(feature = "wasm", assoc(js_code = "sign-error"))]
SignError(#[from] bitcoin::psbt::SignError),
#[error("The BitBox does not support Taproot script path spending.")]
#[cfg_attr(feature = "wasm", assoc(js_code = "unsupported-tap-script"))]
UnsupportedTapScript,
#[error("Could not find our key in an input.")]
#[cfg_attr(feature = "wasm", assoc(js_code = "key-not-found"))]
KeyNotFound,
#[error("Unrecognized/unsupported output type.")]
#[cfg_attr(feature = "wasm", assoc(js_code = "unknown-output-type"))]
UnknownOutputType,
}
enum OurKey {
Segwit(bitcoin::secp256k1::PublicKey, Keypath),
TaprootInternal(Keypath),
}
impl OurKey {
fn keypath(&self) -> Keypath {
match self {
OurKey::Segwit(_, kp) => kp.clone(),
OurKey::TaprootInternal(kp) => kp.clone(),
}
}
}
trait PsbtOutputInfo {
fn get_bip32_derivation(
&self,
) -> &std::collections::BTreeMap<bitcoin::secp256k1::PublicKey, bitcoin::bip32::KeySource>;
fn get_tap_internal_key(&self) -> Option<&bitcoin::secp256k1::XOnlyPublicKey>;
fn get_tap_key_origins(
&self,
) -> &std::collections::BTreeMap<
bitcoin::secp256k1::XOnlyPublicKey,
(
Vec<bitcoin::taproot::TapLeafHash>,
bitcoin::bip32::KeySource,
),
>;
}
impl PsbtOutputInfo for &bitcoin::psbt::Input {
fn get_bip32_derivation(
&self,
) -> &std::collections::BTreeMap<bitcoin::secp256k1::PublicKey, bitcoin::bip32::KeySource> {
&self.bip32_derivation
}
fn get_tap_internal_key(&self) -> Option<&bitcoin::secp256k1::XOnlyPublicKey> {
self.tap_internal_key.as_ref()
}
fn get_tap_key_origins(
&self,
) -> &std::collections::BTreeMap<
bitcoin::secp256k1::XOnlyPublicKey,
(
Vec<bitcoin::taproot::TapLeafHash>,
bitcoin::bip32::KeySource,
),
> {
&self.tap_key_origins
}
}
impl PsbtOutputInfo for &bitcoin::psbt::Output {
fn get_bip32_derivation(
&self,
) -> &std::collections::BTreeMap<bitcoin::secp256k1::PublicKey, bitcoin::bip32::KeySource> {
&self.bip32_derivation
}
fn get_tap_internal_key(&self) -> Option<&bitcoin::secp256k1::XOnlyPublicKey> {
self.tap_internal_key.as_ref()
}
fn get_tap_key_origins(
&self,
) -> &std::collections::BTreeMap<
bitcoin::secp256k1::XOnlyPublicKey,
(
Vec<bitcoin::taproot::TapLeafHash>,
bitcoin::bip32::KeySource,
),
> {
&self.tap_key_origins
}
}
fn find_our_key<T: PsbtOutputInfo>(
our_root_fingerprint: &[u8],
output_info: T,
) -> Result<OurKey, PsbtError> {
if let Some(tap_internal_key) = output_info.get_tap_internal_key() {
let (leaf_hashes, (fingerprint, derivation_path)) = output_info
.get_tap_key_origins()
.get(tap_internal_key)
.ok_or(PsbtError::KeyNotFound)?;
if !leaf_hashes.is_empty() {
return Err(PsbtError::UnsupportedTapScript);
}
if &fingerprint[..] == our_root_fingerprint {
// TODO: check for fingerprint collision
return Ok(OurKey::TaprootInternal(derivation_path.into()));
}
return Err(PsbtError::KeyNotFound);
}
for (pubkey, (fingerprint, derivation_path)) in output_info.get_bip32_derivation().iter() {
if &fingerprint[..] == our_root_fingerprint {
// TODO: check for fingerprint collision
return Ok(OurKey::Segwit(*pubkey, derivation_path.into()));
}
}
Err(PsbtError::KeyNotFound)
}
fn script_config_from_utxo(
output: &bitcoin::TxOut,
keypath: Keypath,
redeem_script: Option<&bitcoin::ScriptBuf>,
_witness_script: Option<&bitcoin::ScriptBuf>,
) -> Result<pb::BtcScriptConfigWithKeypath, PsbtError> {
let keypath = keypath.hardened_prefix();
if output.script_pubkey.is_p2wpkh() {
return Ok(pb::BtcScriptConfigWithKeypath {
script_config: Some(make_script_config_simple(
pb::btc_script_config::SimpleType::P2wpkh,
)),
keypath: keypath.to_vec(),
});
}
let redeem_script_is_p2wpkh = redeem_script.map(|s| s.is_p2wpkh()).unwrap_or(false);
if output.script_pubkey.is_p2sh() && redeem_script_is_p2wpkh {
return Ok(pb::BtcScriptConfigWithKeypath {
script_config: Some(make_script_config_simple(
pb::btc_script_config::SimpleType::P2wpkhP2sh,
)),
keypath: keypath.to_vec(),
});
}
if output.script_pubkey.is_p2tr() {
return Ok(pb::BtcScriptConfigWithKeypath {
script_config: Some(make_script_config_simple(
pb::btc_script_config::SimpleType::P2tr,
)),
keypath: keypath.to_vec(),
});
}
// Check for segwit multisig (p2wsh or p2wsh-p2sh).
let redeem_script_is_p2wsh = redeem_script.map(|s| s.is_p2wsh()).unwrap_or(false);
let is_p2wsh_p2sh = output.script_pubkey.is_p2sh() && redeem_script_is_p2wsh;
if output.script_pubkey.is_p2wsh() || is_p2wsh_p2sh {
todo!();
}
Err(PsbtError::UnknownOutputType)
}
impl Transaction {
fn from_psbt(
our_root_fingerprint: &[u8],
psbt: &bitcoin::psbt::Psbt,
force_script_config: Option<pb::BtcScriptConfigWithKeypath>,
) -> Result<(Self, Vec<OurKey>), PsbtError> {
let mut script_configs: Vec<pb::BtcScriptConfigWithKeypath> = Vec::new();
let mut is_script_config_forced = false;
if let Some(cfg) = force_script_config {
script_configs.push(cfg);
is_script_config_forced = true;
}
let mut our_keys: Vec<OurKey> = Vec::new();
let mut inputs: Vec<TxInput> = Vec::new();
let mut add_script_config = |script_config: pb::BtcScriptConfigWithKeypath| -> usize {
match script_configs.iter().position(|el| el == &script_config) {
Some(pos) => pos,
None => {
script_configs.push(script_config);
script_configs.len() - 1
}
}
};
for (input_index, (tx_input, psbt_input)) in
psbt.unsigned_tx.input.iter().zip(&psbt.inputs).enumerate()
{
let utxo = psbt.spend_utxo(input_index)?;
let our_key = find_our_key(our_root_fingerprint, psbt_input)?;
let script_config_index = if is_script_config_forced {
0
} else {
add_script_config(script_config_from_utxo(
utxo,
our_key.keypath(),
psbt_input.redeem_script.as_ref(),
psbt_input.witness_script.as_ref(),
)?)
};
inputs.push(TxInput {
prev_out_hash: (tx_input.previous_output.txid.as_ref() as &[u8]).to_vec(),
prev_out_index: tx_input.previous_output.vout,
prev_out_value: utxo.value.to_sat(),
sequence: tx_input.sequence.to_consensus_u32(),
keypath: our_key.keypath(),
script_config_index: script_config_index as _,
prev_tx: psbt_input.non_witness_utxo.as_ref().map(PrevTx::from),
});
our_keys.push(our_key);
}
let mut outputs: Vec<TxOutput> = Vec::new();
for (tx_output, psbt_output) in psbt.unsigned_tx.output.iter().zip(&psbt.outputs) {
let our_key = find_our_key(our_root_fingerprint, psbt_output);
// Either change output or a non-change output owned by the BitBox.
match our_key {
Ok(our_key) => {
let script_config_index = if is_script_config_forced {
0
} else {
add_script_config(script_config_from_utxo(
tx_output,
our_key.keypath(),
psbt_output.redeem_script.as_ref(),
psbt_output.witness_script.as_ref(),
)?)
};
outputs.push(TxOutput::Internal(TxInternalOutput {
keypath: our_key.keypath(),
value: tx_output.value.to_sat(),
script_config_index: script_config_index as _,
}));
}
Err(_) => {
outputs.push(TxOutput::External(tx_output.try_into()?));
}
}
}
Ok((
Transaction {
script_configs,
version: psbt.unsigned_tx.version.0 as _,
inputs,
outputs,
locktime: psbt.unsigned_tx.lock_time.to_consensus_u32(),
},
our_keys,
))
}
}
/// Create a single-sig script config.
pub fn make_script_config_simple(
simple_type: pb::btc_script_config::SimpleType,
) -> pb::BtcScriptConfig {
pb::BtcScriptConfig {
config: Some(pb::btc_script_config::Config::SimpleType(
simple_type.into(),
)),
}
}
#[derive(Clone)]
#[cfg_attr(
feature = "wasm",
derive(serde::Deserialize),
serde(rename_all = "camelCase")
)]
#[derive(PartialEq)]
pub struct KeyOriginInfo {
pub root_fingerprint: Option<bitcoin::bip32::Fingerprint>,
pub keypath: Option<Keypath>,
pub xpub: bitcoin::bip32::Xpub,
}
fn convert_xpub(xpub: &bitcoin::bip32::Xpub) -> pb::XPub {
pb::XPub {
depth: vec![xpub.depth],
parent_fingerprint: xpub.parent_fingerprint[..].to_vec(),
child_num: xpub.child_number.into(),
chain_code: xpub.chain_code[..].to_vec(),
public_key: xpub.public_key.serialize().to_vec(),
}
}
impl From<KeyOriginInfo> for pb::KeyOriginInfo {
fn from(value: KeyOriginInfo) -> Self {
pb::KeyOriginInfo {
root_fingerprint: value
.root_fingerprint
.map_or(vec![], |fp| fp.as_bytes().to_vec()),
keypath: value.keypath.map_or(vec![], |kp| kp.to_vec()),
xpub: Some(convert_xpub(&value.xpub)),
}
}
}
/// Create a wallet policy script config according to the wallet policies BIP:
/// <https://github.com/bitcoin/bips/pull/1389>
///
/// At least one of the keys must be ours, i.e. contain our root fingerprint and a keypath to one of
/// our xpubs.
pub fn make_script_config_policy(policy: &str, keys: &[KeyOriginInfo]) -> pb::BtcScriptConfig {
pb::BtcScriptConfig {
config: Some(pb::btc_script_config::Config::Policy(
pb::btc_script_config::Policy {
policy: policy.into(),
keys: keys.iter().cloned().map(pb::KeyOriginInfo::from).collect(),
},
)),
}
}
fn is_taproot(script_config: &pb::BtcScriptConfigWithKeypath) -> bool {
matches!(script_config,
pb::BtcScriptConfigWithKeypath {
script_config:
Some(pb::BtcScriptConfig {
config: Some(pb::btc_script_config::Config::SimpleType(simple_type)),
}),
..
} if *simple_type == pb::btc_script_config::SimpleType::P2tr as i32)
}
impl<R: Runtime> PairedBitBox<R> {
/// Retrieves an xpub. For non-standard keypaths, a warning is displayed on the BitBox even if
/// `display` is false.
pub async fn btc_xpub(
&self,
coin: pb::BtcCoin,
keypath: &Keypath,
xpub_type: pb::btc_pub_request::XPubType,
display: bool,
) -> Result<String, Error> {
match self
.query_proto(Request::BtcPub(pb::BtcPubRequest {
coin: coin as _,
keypath: keypath.to_vec(),
display,
output: Some(pb::btc_pub_request::Output::XpubType(xpub_type as _)),
}))
.await?
{
Response::Pub(pb::PubResponse { r#pub }) => Ok(r#pub),
_ => Err(Error::UnexpectedResponse),
}
}
/// Retrieves a Bitcoin address at the provided keypath.
///
/// For the simple script configs (single-sig), the keypath must follow the
/// BIP44/BIP49/BIP84/BIP86 conventions.
pub async fn btc_address(
&self,
coin: pb::BtcCoin,
keypath: &Keypath,
script_config: &pb::BtcScriptConfig,
display: bool,
) -> Result<String, Error> {
match self
.query_proto(Request::BtcPub(pb::BtcPubRequest {
coin: coin as _,
keypath: keypath.to_vec(),
display,
output: Some(pb::btc_pub_request::Output::ScriptConfig(
script_config.clone(),
)),
}))
.await?
{
Response::Pub(pb::PubResponse { r#pub }) => Ok(r#pub),
_ => Err(Error::UnexpectedResponse),
}
}
async fn query_proto_btc(
&self,
request: pb::btc_request::Request,
) -> Result<pb::btc_response::Response, Error> {
match self
.query_proto(Request::Btc(pb::BtcRequest {
request: Some(request),
}))
.await?
{
Response::Btc(pb::BtcResponse {
response: Some(response),
}) => Ok(response),
_ => Err(Error::UnexpectedResponse),
}
}
async fn get_next_response(&self, request: Request) -> Result<pb::BtcSignNextResponse, Error> {
match self.query_proto(request).await? {
Response::BtcSignNext(next_response) => Ok(next_response),
_ => Err(Error::UnexpectedResponse),
}
}
async fn get_next_response_nested(
&self,
request: pb::btc_request::Request,
) -> Result<pb::BtcSignNextResponse, Error> {
match self.query_proto_btc(request).await? {
pb::btc_response::Response::SignNext(next_response) => Ok(next_response),
_ => Err(Error::UnexpectedResponse),
}
}
/// Sign a Bitcoin transaction. Returns one 64 byte signature (compact serlization of the R and
/// S values) per input.
pub async fn btc_sign(
&self,
coin: pb::BtcCoin,
transaction: &Transaction,
format_unit: pb::btc_sign_init_request::FormatUnit,
) -> Result<Vec<Vec<u8>>, Error> {
self.validate_version(">=9.4.0")?; // anti-klepto since 9.4.0
if transaction.script_configs.iter().any(is_taproot) {
self.validate_version(">=9.10.0")?; // taproot since 9.10.0
}
let mut sigs: Vec<Vec<u8>> = Vec::new();
let mut next_response = self
.get_next_response(Request::BtcSignInit(pb::BtcSignInitRequest {
coin: coin as _,
script_configs: transaction.script_configs.clone(),
version: transaction.version,
num_inputs: transaction.inputs.len() as _,
num_outputs: transaction.outputs.len() as _,
locktime: transaction.locktime,
format_unit: format_unit as _,
}))
.await?;
let mut is_inputs_pass2 = false;
loop {
match pb::btc_sign_next_response::Type::try_from(next_response.r#type)
.map_err(|_| Error::UnexpectedResponse)?
{
pb::btc_sign_next_response::Type::Input => {
let input_index: usize = next_response.index as _;
let tx_input: &TxInput = &transaction.inputs[input_index];
let input_is_schnorr = is_taproot(
&transaction.script_configs[tx_input.script_config_index as usize],
);
let perform_antiklepto = is_inputs_pass2 && !input_is_schnorr;
let host_nonce = if perform_antiklepto {
Some(crate::antiklepto::gen_host_nonce()?)
} else {
None
};
next_response = self
.get_next_response(Request::BtcSignInput(pb::BtcSignInputRequest {
prev_out_hash: tx_input.prev_out_hash.clone(),
prev_out_index: tx_input.prev_out_index,
prev_out_value: tx_input.prev_out_value,
sequence: tx_input.sequence,
keypath: tx_input.keypath.to_vec(),
script_config_index: tx_input.script_config_index,
host_nonce_commitment: host_nonce.as_ref().map(|host_nonce| {
pb::AntiKleptoHostNonceCommitment {
commitment: crate::antiklepto::host_commit(host_nonce).to_vec(),
}
}),
}))
.await?;
if let Some(host_nonce) = host_nonce {
if next_response.r#type
!= pb::btc_sign_next_response::Type::HostNonce as i32
{
return Err(Error::UnexpectedResponse);
}
if let Some(pb::AntiKleptoSignerCommitment { commitment }) =
next_response.anti_klepto_signer_commitment
{
next_response = self
.get_next_response_nested(
pb::btc_request::Request::AntikleptoSignature(
pb::AntiKleptoSignatureRequest {
host_nonce: host_nonce.to_vec(),
},
),
)
.await?;
if !next_response.has_signature {
return Err(Error::UnexpectedResponse);
}
crate::antiklepto::verify_ecdsa(
&host_nonce,
&commitment,
&next_response.signature,
)?
} else {
return Err(Error::UnexpectedResponse);
}
}
if is_inputs_pass2 {
if !next_response.has_signature {
return Err(Error::UnexpectedResponse);
}
sigs.push(next_response.signature.clone());
}
if input_index == transaction.inputs.len() - 1 {
is_inputs_pass2 = true
}
}
pb::btc_sign_next_response::Type::PrevtxInit => {
// TODO handle error
let prevtx: &PrevTx = transaction.inputs[next_response.index as usize]
.prev_tx
.as_ref()
.unwrap();
next_response = self
.get_next_response_nested(pb::btc_request::Request::PrevtxInit(
pb::BtcPrevTxInitRequest {
version: prevtx.version,
num_inputs: prevtx.inputs.len() as _,
num_outputs: prevtx.outputs.len() as _,
locktime: prevtx.locktime,
},
))
.await?;
}
pb::btc_sign_next_response::Type::PrevtxInput => {
// TODO handle error
let prevtx: &PrevTx = transaction.inputs[next_response.index as usize]
.prev_tx
.as_ref()
.unwrap();
let prevtx_input: &PrevTxInput =
&prevtx.inputs[next_response.prev_index as usize];
next_response = self
.get_next_response_nested(pb::btc_request::Request::PrevtxInput(
pb::BtcPrevTxInputRequest {
prev_out_hash: prevtx_input.prev_out_hash.clone(),
prev_out_index: prevtx_input.prev_out_index,
signature_script: prevtx_input.signature_script.clone(),
sequence: prevtx_input.sequence,
},
))
.await?;
}
pb::btc_sign_next_response::Type::PrevtxOutput => {
// TODO handle error
let prevtx: &PrevTx = transaction.inputs[next_response.index as usize]
.prev_tx
.as_ref()
.unwrap();
let prevtx_output: &PrevTxOutput =
&prevtx.outputs[next_response.prev_index as usize];
next_response = self
.get_next_response_nested(pb::btc_request::Request::PrevtxOutput(
pb::BtcPrevTxOutputRequest {
value: prevtx_output.value,
pubkey_script: prevtx_output.pubkey_script.clone(),
},
))
.await?;
}
pb::btc_sign_next_response::Type::Output => {
let tx_output: &TxOutput = &transaction.outputs[next_response.index as usize];
let request: Request = match tx_output {
TxOutput::Internal(output) => {
Request::BtcSignOutput(pb::BtcSignOutputRequest {
ours: true,
value: output.value,
keypath: output.keypath.to_vec(),
script_config_index: output.script_config_index,
..Default::default()
})
}
TxOutput::External(output) => {
Request::BtcSignOutput(pb::BtcSignOutputRequest {
ours: false,
value: output.value,
r#type: output.payload.output_type as _,
payload: output.payload.data.clone(),
..Default::default()
})
}
};
next_response = self.get_next_response(request).await?;
}
pb::btc_sign_next_response::Type::Done => break,
pb::btc_sign_next_response::Type::HostNonce => {
return Err(Error::UnexpectedResponse);
}
}
}
Ok(sigs)
}
/// Sign a PSBT.
///
/// If `force_script_config` is None, we attempt to infer the involved script configs. For the
/// simple script config (single sig), we infer the script config from the involved redeem
/// scripts and provided derviation paths.
///
/// Multisig and policy configs are currently not inferred and must be provided using
/// `force_script_config`.
pub async fn btc_sign_psbt(
&self,
coin: pb::BtcCoin,
psbt: &mut bitcoin::psbt::Psbt,
force_script_config: Option<pb::BtcScriptConfigWithKeypath>,
format_unit: pb::btc_sign_init_request::FormatUnit,
) -> Result<(), Error> {
// since v9.15.0, the BitBox02 accepts "internal" outputs (ones sent to the BitBox02 with
// the keypath) even if the keypath is not a change keypath. PSBTs often contain the key
// origin info in outputs even in regular send-to-self outputs.
self.validate_version(">=9.15.0")?;
let our_root_fingerprint = hex::decode(self.root_fingerprint().await?).unwrap();
let (transaction, our_keys) =
Transaction::from_psbt(&our_root_fingerprint, psbt, force_script_config)?;
let signatures = self.btc_sign(coin, &transaction, format_unit).await?;
for (psbt_input, (signature, our_key)) in
psbt.inputs.iter_mut().zip(signatures.iter().zip(our_keys))
{
match our_key {
OurKey::Segwit(pubkey, _) => {
psbt_input.partial_sigs.insert(
bitcoin::PublicKey::new(pubkey),
bitcoin::ecdsa::Signature {
sig: bitcoin::secp256k1::ecdsa::Signature::from_compact(signature)
.map_err(|_| Error::InvalidSignature)?,
hash_ty: bitcoin::sighash::EcdsaSighashType::All,
},
);
}
OurKey::TaprootInternal(_) => {
psbt_input.tap_key_sig = Some(
bitcoin::taproot::Signature::from_slice(signature)
.map_err(|_| Error::InvalidSignature)?,
)
}
}
}
Ok(())
}
/// Sign a message.
pub async fn btc_sign_message(
&self,
coin: pb::BtcCoin,
script_config: pb::BtcScriptConfigWithKeypath,
msg: &[u8],
) -> Result<SignMessageSignature, Error> {
self.validate_version(">=9.5.0")?;
let host_nonce = crate::antiklepto::gen_host_nonce()?;
let request = pb::BtcSignMessageRequest {
coin: coin as _,
script_config: Some(script_config),
msg: msg.to_vec(),
host_nonce_commitment: Some(pb::AntiKleptoHostNonceCommitment {
commitment: crate::antiklepto::host_commit(&host_nonce).to_vec(),
}),
};
let response = self
.query_proto_btc(pb::btc_request::Request::SignMessage(request))
.await?;
let signer_commitment = match response {
pb::btc_response::Response::AntikleptoSignerCommitment(
pb::AntiKleptoSignerCommitment { commitment },
) => commitment,
_ => return Err(Error::UnexpectedResponse),
};
let request = pb::AntiKleptoSignatureRequest {
host_nonce: host_nonce.to_vec(),
};
let response = self
.query_proto_btc(pb::btc_request::Request::AntikleptoSignature(request))
.await?;
let signature = match response {
pb::btc_response::Response::SignMessage(pb::BtcSignMessageResponse { signature }) => {
signature
}
_ => return Err(Error::UnexpectedResponse),
};
crate::antiklepto::verify_ecdsa(&host_nonce, &signer_commitment, &signature)?;
let sig = signature[..64].to_vec();
let recid = signature[64];
let compressed: u8 = 4; // BitBox02 uses only compressed pubkeys
let sig65: u8 = 27 + compressed + recid;
let mut electrum_sig65 = vec![sig65];
electrum_sig65.extend_from_slice(&sig);
Ok(SignMessageSignature {
sig,
recid,
electrum_sig65,
})
}
/// Before a multisig or policy script config can be used to display receive addresses or sign
/// transactions, it must be registered on the device. This function checks if the script config
/// was already registered.
///
/// `keypath_account` must be set if the script config is multisig, and can be `None` if it is a
/// policy.
pub async fn btc_is_script_config_registered(
&self,
coin: pb::BtcCoin,
script_config: &pb::BtcScriptConfig,
keypath_account: Option<&Keypath>,
) -> Result<bool, Error> {
match self
.query_proto_btc(pb::btc_request::Request::IsScriptConfigRegistered(
pb::BtcIsScriptConfigRegisteredRequest {
registration: Some(pb::BtcScriptConfigRegistration {
coin: coin as _,
script_config: Some(script_config.clone()),
keypath: keypath_account.map_or(vec![], |kp| kp.to_vec()),
}),
},
))
.await?
{
pb::btc_response::Response::IsScriptConfigRegistered(response) => {
Ok(response.is_registered)
}
_ => Err(Error::UnexpectedResponse),
}
}
/// Before a multisig or policy script config can be used to display receive addresses or sign
/// transcations, it must be registered on the device.
///
/// If no name is provided, the user will be asked to enter it on the device instead. If
/// provided, it must be non-empty, smaller or equal to 30 chars, consist only of printable
/// ASCII characters, and contain no whitespace other than spaces.
///
///
/// `keypath_account` must be set if the script config is multisig, and can be `None` if it is a
/// policy.
pub async fn btc_register_script_config(
&self,
coin: pb::BtcCoin,
script_config: &pb::BtcScriptConfig,
keypath_account: Option<&Keypath>,
xpub_type: pb::btc_register_script_config_request::XPubType,
name: Option<&str>,
) -> Result<(), Error> {
match self
.query_proto_btc(pb::btc_request::Request::RegisterScriptConfig(
pb::BtcRegisterScriptConfigRequest {
registration: Some(pb::BtcScriptConfigRegistration {
coin: coin as _,
script_config: Some(script_config.clone()),
keypath: keypath_account.map_or(vec![], |kp| kp.to_vec()),
}),
name: name.unwrap_or("").into(),
xpub_type: xpub_type as _,
},
))
.await?
{
pb::btc_response::Response::Success(_) => Ok(()),
_ => Err(Error::UnexpectedResponse),
}
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::keypath::HARDENED;
#[test]
fn test_payload_from_pkscript() {
use std::str::FromStr;
// P2PKH