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Support no-std builds of bitcoin-serai

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Arguably not meaningful, as it adds the scanner yet not the RPC, and no signing
code since modular-frost doesn't support no-std yet. It's a step in the right
direction though.
This commit is contained in:
Luke Parker
2023-08-21 08:56:37 -04:00
parent a52c86ad81
commit 76a30fd572
10 changed files with 238 additions and 164 deletions
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29
coins/bitcoin/src/wallet/mod.rs
View File

@@ -1,33 +1,45 @@
use std::{
io::{self, Read, Write},
use std_shims::{
vec::Vec,
collections::HashMap,
io::{self, Write},
};
#[cfg(feature = "std")]
use std_shims::io::Read;
use k256::{
elliptic_curve::sec1::{Tag, ToEncodedPoint},
Scalar, ProjectivePoint,
};
#[cfg(feature = "std")]
use frost::{
curve::{Ciphersuite, Secp256k1},
ThresholdKeys,
};
use bitcoin::{
consensus::encode::{Decodable, serialize},
consensus::encode::serialize,
key::TweakedPublicKey,
address::Payload,
OutPoint, ScriptBuf, TxOut, Transaction, Block,
};
#[cfg(feature = "std")]
use bitcoin::consensus::encode::Decodable;
use crate::crypto::{x_only, make_even};
use crate::crypto::x_only;
#[cfg(feature = "std")]
use crate::crypto::make_even;
#[cfg(feature = "std")]
mod send;
#[cfg(feature = "std")]
pub use send::*;
/// Tweak keys to ensure they're usable with Bitcoin.
///
/// Taproot keys, which these keys are used as, must be even. This offsets the keys until they're
/// even.
#[cfg(feature = "std")]
pub fn tweak_keys(keys: &ThresholdKeys<Secp256k1>) -> ThresholdKeys<Secp256k1> {
let (_, offset) = make_even(keys.group_key());
keys.offset(Scalar::from(offset))
@@ -72,6 +84,7 @@ impl ReceivedOutput {
}
/// Read a ReceivedOutput from a generic satisfying Read.
#[cfg(feature = "std")]
pub fn read<R: Read>(r: &mut R) -> io::Result<ReceivedOutput> {
Ok(ReceivedOutput {
offset: Secp256k1::read_F(r)?,
@@ -89,9 +102,9 @@ impl ReceivedOutput {
w.write_all(&serialize(&self.outpoint))
}
/// Serialize a ReceivedOutput to a Vec<u8>.
/// Serialize a ReceivedOutput to a `Vec<u8>`.
pub fn serialize(&self) -> Vec<u8> {
let mut res = vec![];
let mut res = Vec::new();
self.write(&mut res).unwrap();
res
}
@@ -143,7 +156,7 @@ impl Scanner {
/// Scan a transaction.
pub fn scan_transaction(&self, tx: &Transaction) -> Vec<ReceivedOutput> {
let mut res = vec![];
let mut res = Vec::new();
for (vout, output) in tx.output.iter().enumerate() {
// If the vout index exceeds 2**32, stop scanning outputs
let Ok(vout) = u32::try_from(vout) else { break };
@@ -165,7 +178,7 @@ impl Scanner {
/// must be immediately spendable, a post-processing pass is needed to remove those outputs.
/// Alternatively, scan_transaction can be called on `block.txdata[1 ..]`.
pub fn scan_block(&self, block: &Block) -> Vec<ReceivedOutput> {
let mut res = vec![];
let mut res = Vec::new();
for tx in &block.txdata {
res.extend(self.scan_transaction(tx));
}