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use std::str::FromStr;
pub extern crate bitcoin;
use bitcoin::hashes::{sha256, Hash};
use bitcoin::secp256k1::Secp256k1;
use bitcoin::util::address::{self, Address};
use bitcoin::util::bip32::{ChainCode, ChildNumber, DerivationPath, ExtendedPubKey};
use bitcoin::util::psbt::serialize::Serialize;
use bitcoin::util::{base58, bip32};
use bitcoin::{secp256k1, OutPoint, PrivateKey, PublicKey, Script, Transaction};
const PAYMENT_CODE_BIN_LENGTH: usize = 80;
const LETTER_P: u8 = 0x47;
#[derive(Debug, Clone)]
pub enum Version {
V1,
V2,
}
impl Version {
pub fn as_byte(&self) -> u8 {
match self {
Version::V1 => 0x01,
Version::V2 => 0x02,
}
}
pub fn from_byte(value: u8) -> Result<Self, Error> {
match value {
0x01 => Ok(Version::V1),
0x02 => Ok(Version::V2),
_ => Err(Error::UnsupportedVersion),
}
}
}
pub struct PrivateCode {
identity_key: bip32::ExtendedPrivKey,
curve: Secp256k1<secp256k1::All>,
network: bitcoin::Network,
}
impl PrivateCode {
pub fn from_seed(
seed: &[u8],
account: u32,
network: bitcoin::Network,
) -> Result<Self, bip32::Error> {
let curve = Secp256k1::new();
let path = DerivationPath::from_str(&format!("m/47'/0'/{}'", account))?;
let root_key = bip32::ExtendedPrivKey::new_master(network, seed)?;
let identity_key = root_key.derive_priv(&curve, &path)?;
Ok(Self {
identity_key,
curve,
network,
})
}
pub fn from_seed_ephemeral(
seed: &[u8],
account: u32,
network: bitcoin::Network,
ephemeral_index: u32,
) -> Result<Self, bip32::Error> {
let curve = Secp256k1::new();
let path =
DerivationPath::from_str(&format!("m/47'/0'/{}'/{}'", account, ephemeral_index))?;
let root_key = bip32::ExtendedPrivKey::new_master(network, seed)?;
let identity_key = root_key.derive_priv(&curve, &path)?;
Ok(Self {
identity_key,
curve,
network,
})
}
pub fn v1_public_code(&self, bitmessage: Option<BitMessagePreference>) -> PublicCode {
let xpub = ExtendedPubKey::from_priv(&self.curve, &self.identity_key);
PublicCode {
version: Version::V1,
bitmessage,
xpub,
curve: self.curve.clone(),
network: self.network,
}
}
pub fn v2_public_code(&self) -> PublicCode {
let xpub = ExtendedPubKey::from_priv(&self.curve, &self.identity_key);
PublicCode {
version: Version::V1,
bitmessage: None,
xpub,
curve: self.curve.clone(),
network: self.network,
}
}
fn child(&self, i: u32) -> Result<PrivateKey, bip32::Error> {
let child_number = ChildNumber::from_normal_idx(i)?;
let key = self.identity_key.ckd_priv(&self.curve, child_number)?;
Ok(key.to_priv())
}
pub fn private_key(&self, sender_code: &PublicCode, i: u32) -> Result<PrivateKey, Error> {
let sk = self.child(i)?;
let pk = sender_code.child(0)?;
let sp = secret_point(&sk, pk)?;
let ss = shared_secret(sp)?;
let mut sk_prime = sk.inner;
sk_prime.add_assign(&ss)?;
let sk_prime = PrivateKey::new(sk_prime, self.network);
Ok(sk_prime)
}
pub fn address(
&self,
sender_code: &PublicCode,
i: u32,
segwit: bool,
) -> Result<Address, Error> {
let sk_prime = self.private_key(sender_code, i)?;
let pk_prime = PublicKey::from_private_key(&self.curve, &sk_prime);
if segwit {
Address::p2wpkh(&pk_prime, self.network).map_err(Error::Address)
} else {
Ok(Address::p2pkh(&pk_prime, self.network))
}
}
}
#[derive(Debug)]
pub struct PublicCode {
version: Version,
bitmessage: Option<BitMessagePreference>,
xpub: ExtendedPubKey,
curve: Secp256k1<secp256k1::All>,
pub network: bitcoin::Network,
}
impl PublicCode {
pub fn version(&self) -> &Version {
&self.version
}
pub fn from_wif(payment_code: &str) -> Result<Self, Error> {
PublicCode::try_from_str(payment_code)
}
pub fn notification_mode(&self) -> NotificationMode {
match &self.version {
Version::V1 => match self.bitmessage.as_ref() {
Some(bitmessage) => NotificationMode::Bitmessage(Bitmessage {
code: self,
preferences: bitmessage,
}),
None => NotificationMode::BasicTransaction(BasicTransaction(self)),
},
Version::V2 => NotificationMode::BloomMultisig(BloomMultisig(self)),
}
}
fn child(&self, i: u32) -> Result<PublicKey, bip32::Error> {
let child_number = ChildNumber::from_normal_idx(i)?;
let key = self.xpub.ckd_pub(&self.curve, child_number)?.to_pub();
Ok(key)
}
pub fn address(&self, code: &PrivateCode, i: u32, segwit: bool) -> Result<Address, Error> {
let sk = code.child(0)?;
let pk = self.child(i)?;
let sp = secret_point(&sk, pk)?;
let ss = shared_secret(sp)?;
let ss = secp256k1::SecretKey::from_slice(&ss)?;
let sg = secp256k1::PublicKey::from_secret_key(&self.curve, &ss);
let pk_prime = PublicKey::new(sg.combine(&pk.inner)?);
if segwit {
Address::p2wpkh(&pk_prime, self.network).map_err(Error::Address)
} else {
Ok(Address::p2pkh(&pk_prime, self.network))
}
}
fn as_bytes(&self) -> [u8; PAYMENT_CODE_BIN_LENGTH] {
let mut payment_code = [0_u8; PAYMENT_CODE_BIN_LENGTH];
payment_code[0] = self.version.as_byte();
payment_code[1] = if self.bitmessage.is_some() {
0x80
} else {
0x00
};
payment_code[2..35].copy_from_slice(&self.xpub.public_key.serialize());
payment_code[35..67].copy_from_slice(self.xpub.chain_code.as_bytes());
if let Some(bitmessage) = &self.bitmessage {
payment_code[67] = bitmessage.version;
payment_code[68] = bitmessage.stream_number;
}
payment_code
}
pub fn from_notification(
receiver_code: &PrivateCode,
designated: Option<(PublicKey, OutPoint)>,
tx: &Transaction,
) -> Result<Self, Error> {
let (designated_pk, designated_utxo) =
designated
.or_else(|| find_designated(tx))
.ok_or(Error::Notification(
"Designated pubkey and output not found",
))?;
let notification_sk = receiver_code.child(0)?;
let blinding_factor = blinding_factor(¬ification_sk, &designated_pk, &designated_utxo)?;
let op_return = tx
.output
.iter()
.find(|out| out.script_pubkey.is_op_return())
.ok_or(Error::Notification("OP_RETURN not found"))?;
use bitcoin::blockdata::script::Instruction::PushBytes;
if let Some(Ok(PushBytes(data))) = op_return.script_pubkey.instructions().nth(1) {
if data.len() == PAYMENT_CODE_BIN_LENGTH {
let mut code_bytes: [u8; PAYMENT_CODE_BIN_LENGTH] = [0; PAYMENT_CODE_BIN_LENGTH];
code_bytes.copy_from_slice(data);
blind_payment_code(&mut code_bytes, &blinding_factor);
PublicCode::try_from_bytes(&code_bytes[..])
} else {
Err(Error::Notification("OP_RETURN incorrect length"))
}
} else {
Err(Error::Notification("OP_RETURN not found"))
}
}
}
impl std::fmt::Display for PublicCode {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
let bytes = self.as_bytes();
let mut extended: Vec<u8> = Vec::with_capacity(1 + PAYMENT_CODE_BIN_LENGTH);
extended.push(LETTER_P);
extended.extend_from_slice(&bytes);
base58::check_encode_slice_to_fmt(f, &extended)
}
}
impl PublicCode {
fn try_from_bytes(payment_code: &[u8]) -> Result<Self, Error> {
if payment_code.len() != PAYMENT_CODE_BIN_LENGTH {
return Err(Error::Format("Incorrect binary length"));
}
let version = Version::from_byte(payment_code[0])?;
let bitmessage = payment_code[1] == 0x80;
let public_key = PublicKey::from_slice(&payment_code[2..35])?.inner;
let chain_code = ChainCode::from(&payment_code[35..67]);
let bitmessage = if bitmessage {
Some(BitMessagePreference {
version: payment_code[67],
stream_number: payment_code[68],
})
} else {
None
};
let network = bitcoin::Network::Bitcoin;
let xpub = ExtendedPubKey {
network,
chain_code,
child_number: ChildNumber::Normal { index: 0 },
depth: 3,
parent_fingerprint: bip32::Fingerprint::default(),
public_key,
};
Ok(Self {
version,
bitmessage,
xpub,
curve: Secp256k1::new(),
network,
})
}
fn try_from_str(value: &str) -> Result<Self, Error> {
let payment_code = base58::from_check(value).map_err(Error::Base58)?;
if payment_code.first() != Some(&LETTER_P) {
return Err(Error::Format("Incorrect version bytes"));
}
PublicCode::try_from_bytes(&payment_code[1..])
}
}
pub enum NotificationMode<'a> {
BasicTransaction(BasicTransaction<'a>),
Bitmessage(Bitmessage<'a>),
BloomMultisig(BloomMultisig<'a>),
}
pub struct BasicTransaction<'a>(&'a PublicCode);
impl<'a> BasicTransaction<'a> {
pub fn notification_pubkey(&self) -> Result<PublicKey, Error> {
let child = self
.0
.xpub
.ckd_pub(&self.0.curve, ChildNumber::from_normal_idx(0)?);
let key = child?.to_pub();
Ok(key)
}
pub fn notification_address(&self, segwit: bool) -> Result<Address, Error> {
let key = self.notification_pubkey()?;
if segwit {
Address::p2wpkh(&key, self.0.network).map_err(Error::Address)
} else {
Ok(Address::p2pkh(&key, self.0.network))
}
}
pub fn make_notification_scripts(
&self,
sender_code: &PublicCode,
notification_sk: &PrivateKey,
notification_utxo: &bitcoin::OutPoint,
) -> Result<(Script, Script), Error> {
make_v1_notification_scripts(sender_code, self.0, notification_sk, notification_utxo)
}
pub fn notification_privkey(private_code: &PrivateCode) -> Result<PrivateKey, Error> {
private_code.child(0).map_err(Error::Bip32)
}
}
pub struct Bitmessage<'a> {
code: &'a PublicCode,
preferences: &'a BitMessagePreference,
}
impl<'a> Bitmessage<'a> {
pub fn make_send_params(&self, n: u32) -> Result<BitMessageSendParams, Error> {
let signing_key = self
.code
.xpub
.ckd_pub(&self.code.curve, ChildNumber::from_normal_idx(0)?)?
.ckd_pub(&self.code.curve, ChildNumber::from_normal_idx(0)?)?
.to_pub();
let encryption_key = self
.code
.xpub
.ckd_pub(&self.code.curve, ChildNumber::from_normal_idx(0)?)?
.ckd_pub(&self.code.curve, ChildNumber::from_normal_idx(n)?)?
.to_pub();
Ok(BitMessageSendParams {
encryption_key,
signing_key,
stream_number: self.preferences.stream_number,
version: self.preferences.version,
})
}
}
pub struct BloomMultisig<'a>(&'a PublicCode);
impl<'a> BloomMultisig<'a> {
pub fn identifier(&self) -> Vec<u8> {
let hashed_payment_code = sha256::Hash::hash(&self.0.as_bytes());
let mut identifier = Vec::with_capacity(33);
identifier.push(0x02_u8);
identifier.extend_from_slice(&hashed_payment_code);
identifier
}
pub fn notification_params(
&self,
sender_code: &PublicCode,
notification_sk: &PrivateKey,
notification_utxo: &bitcoin::OutPoint,
change_pk: &PublicKey,
) -> Result<(Script, Script), Error> {
use bitcoin::blockdata::opcodes::all as opcode;
use bitcoin::blockdata::script::Builder;
let op_return_script = {
let notification_pk = self.0.child(0)?;
let blinding_factor =
blinding_factor(notification_sk, ¬ification_pk, notification_utxo)?;
let mut sender_code = sender_code.as_bytes();
blind_payment_code(&mut sender_code, &blinding_factor);
Script::new_op_return(&sender_code)
};
let serialized_pk = change_pk.serialize();
let identifier = self.identifier();
let (first_push, second_push) = match &serialized_pk.cmp(&identifier) {
std::cmp::Ordering::Less => (serialized_pk, identifier),
_ => (identifier, serialized_pk),
};
let multisig_script = Builder::new()
.push_opcode(opcode::OP_PUSHNUM_1)
.push_slice(&first_push)
.push_slice(&second_push)
.push_opcode(opcode::OP_PUSHNUM_2)
.push_opcode(opcode::OP_CHECKMULTISIG)
.into_script();
Ok((multisig_script, op_return_script))
}
}
#[derive(Debug)]
pub struct BitMessagePreference {
pub version: u8,
pub stream_number: u8,
}
#[derive(Debug)]
pub struct BitMessageSendParams {
pub signing_key: PublicKey,
pub encryption_key: PublicKey,
pub version: u8,
pub stream_number: u8,
}
fn secret_point(sk: &PrivateKey, mut pk: PublicKey) -> Result<[u8; 32], secp256k1::Error> {
pk.inner.mul_assign(&Secp256k1::new(), &sk.to_bytes())?;
let mut point = [0_u8; 32];
point.copy_from_slice(&pk.inner.serialize()[1..]);
Ok(point)
}
fn shared_secret(secret_point: [u8; 32]) -> Result<[u8; 32], secp256k1::Error> {
let hash = sha256::Hash::hash(&secret_point);
secp256k1::SecretKey::from_slice(&hash)?;
Ok(hash.into_inner())
}
pub fn blinding_factor(
sk: &PrivateKey,
pk: &PublicKey,
utxo: &bitcoin::OutPoint,
) -> Result<[u8; 64], secp256k1::Error> {
let mut pk = pk.inner;
pk.mul_assign(&Secp256k1::new(), &sk.to_bytes())?;
let mut encoded_utxo = Vec::with_capacity(36);
encoded_utxo.extend_from_slice(&utxo.txid);
encoded_utxo.extend_from_slice(&u32_to_le_bytes(utxo.vout));
use bitcoin::hashes::{self, sha512, HashEngine, Hmac};
let mut hmac = hashes::hmac::HmacEngine::<sha512::Hash>::new(&encoded_utxo);
hmac.input(&pk.serialize()[1..]);
let hash = Hmac::<sha512::Hash>::from_engine(hmac);
Ok(hash.into_inner())
}
fn blind_payment_code(bytes: &mut [u8; PAYMENT_CODE_BIN_LENGTH], mask: &[u8; 64]) {
bytes
.iter_mut()
.skip(3)
.zip(mask.iter())
.for_each(|(a, b)| {
*a ^= b;
});
}
fn make_v1_notification_scripts(
sender_code: &PublicCode,
recipient_code: &PublicCode,
notification_sk: &PrivateKey,
notification_utxo: &bitcoin::OutPoint,
) -> Result<(Script, Script), Error> {
let notification_pk = recipient_code.child(0)?;
let blinding_factor = blinding_factor(notification_sk, ¬ification_pk, notification_utxo)?;
let mut sender_code = sender_code.as_bytes();
blind_payment_code(&mut sender_code, &blinding_factor);
Ok((
bitcoin::Script::new_p2pkh(¬ification_pk.pubkey_hash()),
bitcoin::Script::new_op_return(&sender_code),
))
}
fn find_designated(tx: &Transaction) -> Option<(PublicKey, OutPoint)> {
use bitcoin::blockdata::script::Instruction::PushBytes;
fn from_scriptsig(tx: &Transaction) -> Option<(PublicKey, OutPoint)> {
tx.input
.iter()
.filter_map(|tx_in| {
let first_pk = tx_in
.script_sig
.instructions()
.filter_map(|op| match op {
Ok(PushBytes(bytes)) => PublicKey::from_slice(bytes).ok(),
_ => None,
})
.next();
first_pk.map(|pk| (pk, tx_in.previous_output))
})
.next()
}
fn from_witness(tx: &Transaction) -> Option<(PublicKey, OutPoint)> {
tx.input
.iter()
.filter_map(|tx_in| {
let first_pk = tx_in
.witness
.iter()
.filter_map(|witness| PublicKey::from_slice(witness).ok())
.next();
first_pk.map(|pk| (pk, tx_in.previous_output))
})
.next()
}
from_scriptsig(tx).or_else(|| from_witness(tx))
}
#[derive(Debug, PartialEq, Eq, Clone)]
pub enum Error {
Format(&'static str),
Base58(base58::Error),
Bip32(bip32::Error),
Ecdsa(secp256k1::Error),
UnsupportedVersion,
Notification(&'static str),
Address(address::Error),
Key(bitcoin::util::key::Error),
}
impl From<bip32::Error> for Error {
fn from(error: bip32::Error) -> Self {
Error::Bip32(error)
}
}
impl From<secp256k1::Error> for Error {
fn from(error: secp256k1::Error) -> Self {
Error::Ecdsa(error)
}
}
impl From<bitcoin::util::key::Error> for Error {
fn from(error: bitcoin::util::key::Error) -> Self {
Error::Key(error)
}
}
fn u32_to_le_bytes(x: u32) -> [u8; 4] {
let b1: u8 = (x & 0xff) as u8;
let b2: u8 = ((x >> 8) & 0xff) as u8;
let b3: u8 = ((x >> 16) & 0xff) as u8;
let b4: u8 = ((x >> 24) & 0xff) as u8;
[b1, b2, b3, b4]
}
#[cfg(test)]
#[allow(non_snake_case)]
#[allow(non_upper_case_globals)]
mod tests {
use std::fmt::Write;
use std::str::FromStr;
extern crate bitcoin;
use bitcoin::hashes::{self, hex::HexIterator};
use bitcoin::secp256k1::Secp256k1;
use bitcoin::util::psbt::serialize::Deserialize;
use bitcoin::{Address, Network, PrivateKey, PublicKey};
use super::{
blind_payment_code, blinding_factor, find_designated, make_v1_notification_scripts,
secret_point, NotificationMode, PrivateCode, PublicCode,
};
const ALICE_BIP32_SEED: &str = "64dca76abc9c6f0cf3d212d248c380c4622c8f93b2c425ec6a5567fd5db57e10d3e6f94a2f6af4ac2edb8998072aad92098db73558c323777abf5bd1082d970a";
const ALICE_PAYMENT_CODE: &str = "PM8TJTLJbPRGxSbc8EJi42Wrr6QbNSaSSVJ5Y3E4pbCYiTHUskHg13935Ubb7q8tx9GVbh2UuRnBc3WSyJHhUrw8KhprKnn9eDznYGieTzFcwQRya4GA";
const ALICE_NOTIFICATION_ADDRESS: &str = "1JDdmqFLhpzcUwPeinhJbUPw4Co3aWLyzW";
const ALICE_a0: &str = "8d6a8ecd8ee5e0042ad0cb56e3a971c760b5145c3917a8e7beaf0ed92d7a520c";
const ALICE_A0: &str = "0353883a146a23f988e0f381a9507cbdb3e3130cd81b3ce26daf2af088724ce683";
const BOB_BIP32_SEED: &str = "87eaaac5a539ab028df44d9110defbef3797ddb805ca309f61a69ff96dbaa7ab5b24038cf029edec5235d933110f0aea8aeecf939ed14fc20730bba71e4b1110";
const BOB_PAYMENT_CODE: &str = "PM8TJS2JxQ5ztXUpBBRnpTbcUXbUHy2T1abfrb3KkAAtMEGNbey4oumH7Hc578WgQJhPjBxteQ5GHHToTYHE3A1w6p7tU6KSoFmWBVbFGjKPisZDbP97";
const BOB_NOTIFICATION_ADDRESS: &str = "1ChvUUvht2hUQufHBXF8NgLhW8SwE2ecGV";
const BOB_b0: &str = "04448fd1be0c9c13a5ca0b530e464b619dc091b299b98c5cab9978b32b4a1b8b";
const BOB_B0: &str = "024ce8e3b04ea205ff49f529950616c3db615b1e37753858cc60c1ce64d17e2ad8";
const BOB_b1: &str = "6bfa917e4c44349bfdf46346d389bf73a18cec6bc544ce9f337e14721f06107b";
const BOB_B1: &str = "03e092e58581cf950ff9c8fc64395471733e13f97dedac0044ebd7d60ccc1eea4d";
const BOB_b2: &str = "46d32fbee043d8ee176fe85a18da92557ee00b189b533fce2340e4745c4b7b8c";
const BOB_B2: &str = "029b5f290ef2f98a0462ec691f5cc3ae939325f7577fcaf06cfc3b8fc249402156";
const SECRET_POINT_0: &str = "f5bb84706ee366052471e6139e6a9a969d586e5fe6471a9b96c3d8caefe86fef";
const SECRET_POINT_1: &str = "adfb9b18ee1c4460852806a8780802096d67a8c1766222598dc801076beb0b4d";
const SECRET_POINT_2: &str = "79e860c3eb885723bb5a1d54e5cecb7df5dc33b1d56802906762622fa3c18ee5";
const BOB_ADDR_0: &str = "141fi7TY3h936vRUKh1qfUZr8rSBuYbVBK";
const BOB_ADDR_1: &str = "12u3Uued2fuko2nY4SoSFGCoGLCBUGPkk6";
const BOB_ADDR_2: &str = "1FsBVhT5dQutGwaPePTYMe5qvYqqjxyftc";
const ALICE_DESIGNATED_PRIVATE_KEY: &str =
"Kx983SRhAZpAhj7Aac1wUXMJ6XZeyJKqCxJJ49dxEbYCT4a1ozRD";
const ALICE_NOTIFICATION_UTXO: &str =
"9c6000d597c5008f7bfc2618aed5e4a6ae57677aab95078aae708e1cab11f486:1";
const NOTIFICATION_BLINDING_FACTOR: &str = "be6e7a4256cac6f4d4ed4639b8c39c4cb8bece40010908e70d17ea9d77b4dc57f1da36f2d6641ccb37cf2b9f3146686462e0fa3161ae74f88c0afd4e307adbd5";
const ALICE_BLINDED_CODE: &str = "010002063e4eb95e62791b06c50e1a3a942e1ecaaa9afbbeb324d16ae6821e091611fa96c0cf048f607fe51a0327f5e2528979311c78cb2de0d682c61e1180fc3d543b00000000000000000000000000";
const NOTIFICATION_SCRIPT: &str = "76a9148066a8e7ee82e5c5b9b7dc1765038340dc5420a988ac";
const OP_RETURN_SCRIPT: &str = "6a4c50010002063e4eb95e62791b06c50e1a3a942e1ecaaa9afbbeb324d16ae6821e091611fa96c0cf048f607fe51a0327f5e2528979311c78cb2de0d682c61e1180fc3d543b00000000000000000000000000";
const NOTIFICATION_TX: &str = "\
010000000186f411ab1c8e70ae8a0795ab7a6757aea6e4d5ae1826fc7b8f00c597d500609c010000006b48304502210\
0ac8c6dbc482c79e86c18928a8b364923c774bfdbd852059f6b3778f2319b59a7022029d7cc5724e2f41ab1fcfc0ba5\
a0d4f57ca76f72f19530ba97c860c70a6bf0a801210272d83d8a1fa323feab1c085157a0791b46eba34afb8bfbfaeb3\
a3fcc3f2c9ad8ffffffff0210270000000000001976a9148066a8e7ee82e5c5b9b7dc1765038340dc5420a988ac1027\
000000000000536a4c50010002063e4eb95e62791b06c50e1a3a942e1ecaaa9afbbeb324d16ae6821e091611fa96c0c\
f048f607fe51a0327f5e2528979311c78cb2de0d682c61e1180fc3d543b0000000000000000000000000000000000";
fn from_hex(hex: &str) -> Vec<u8> {
HexIterator::new(hex)
.unwrap()
.filter_map(|a| a.ok())
.collect()
}
fn to_hex(bytes: &[u8]) -> Option<String> {
let mut s = String::with_capacity(2 * bytes.len());
for byte in bytes {
write!(s, "{:02x}", byte).ok()?;
}
Some(s)
}
#[test]
fn test_payment_code_from_seed() {
let seed: Vec<u8> = hashes::hex::FromHex::from_hex(ALICE_BIP32_SEED).unwrap();
let private = PrivateCode::from_seed(&seed, 0, Network::Bitcoin).unwrap();
let public = private.v1_public_code(None);
assert_eq!(public.to_string(), ALICE_PAYMENT_CODE);
}
#[test]
fn test_payment_code_from_text() {
let payment_code = PublicCode::from_wif(ALICE_PAYMENT_CODE).unwrap();
assert_eq!(payment_code.to_string(), ALICE_PAYMENT_CODE);
}
#[test]
fn test_notification_address() {
let alice_payment_code = PublicCode::from_wif(ALICE_PAYMENT_CODE).unwrap();
if let NotificationMode::BasicTransaction(onchain) = alice_payment_code.notification_mode()
{
assert_eq!(
onchain.notification_address(false).unwrap(),
Address::from_str(ALICE_NOTIFICATION_ADDRESS).unwrap()
);
} else {
panic!("should not be using bitmessage here");
}
let bob_payment_code = PublicCode::from_wif(BOB_PAYMENT_CODE).unwrap();
if let NotificationMode::BasicTransaction(onchain) = bob_payment_code.notification_mode() {
assert_eq!(
onchain.notification_address(false).unwrap(),
Address::from_str(BOB_NOTIFICATION_ADDRESS).unwrap()
);
} else {
panic!("should not be using bitmessage here");
}
}
#[test]
#[allow(non_snake_case)]
fn test_ecdh_params() {
let alice_seed: Vec<u8> = hashes::hex::FromHex::from_hex(ALICE_BIP32_SEED).unwrap();
let alice_private = PrivateCode::from_seed(&alice_seed, 0, Network::Bitcoin).unwrap();
let alice_a0 = alice_private.child(0).unwrap();
let alice_A0 = PublicKey::from_private_key(&Secp256k1::new(), &alice_a0);
assert_eq!(ALICE_a0, alice_a0.inner.display_secret().to_string());
assert_eq!(ALICE_A0, alice_A0.to_string());
let bob_seed: Vec<u8> = hashes::hex::FromHex::from_hex(BOB_BIP32_SEED).unwrap();
let bob_private = PrivateCode::from_seed(&bob_seed, 0, Network::Bitcoin).unwrap();
let bob_b0 = bob_private.child(0).unwrap();
let bob_b1 = bob_private.child(1).unwrap();
let bob_b2 = bob_private.child(2).unwrap();
let bob_B0 = PublicKey::from_private_key(&Secp256k1::new(), &bob_b0);
let bob_B1 = PublicKey::from_private_key(&Secp256k1::new(), &bob_b1);
let bob_B2 = PublicKey::from_private_key(&Secp256k1::new(), &bob_b2);
assert_eq!(BOB_b0, bob_b0.inner.display_secret().to_string());
assert_eq!(BOB_b1, bob_b1.inner.display_secret().to_string());
assert_eq!(BOB_b2, bob_b2.inner.display_secret().to_string());
assert_eq!(BOB_B0, bob_B0.to_string());
assert_eq!(BOB_B1, bob_B1.to_string());
assert_eq!(BOB_B2, bob_B2.to_string());
}
#[test]
#[allow(non_snake_case)]
fn test_ecdh_params_from_public() {
let alice_public = PublicCode::from_wif(ALICE_PAYMENT_CODE).unwrap();
let alice_A0 = alice_public.child(0).unwrap();
assert_eq!(ALICE_A0, alice_A0.to_string());
}
#[test]
fn test_secret_point_alice_side() {
let sk = PrivateKey::from_slice(&from_hex(&ALICE_a0), bitcoin::Network::Bitcoin).unwrap();
let pk0 = PublicKey::from_slice(&from_hex(&BOB_B0)).unwrap();
let pk1 = PublicKey::from_slice(&from_hex(&BOB_B1)).unwrap();
let pk2 = PublicKey::from_slice(&from_hex(&BOB_B2)).unwrap();
let sp0 = secret_point(&sk, pk0).unwrap();
let sp1 = secret_point(&sk, pk1).unwrap();
let sp2 = secret_point(&sk, pk2).unwrap();
assert_eq!(SECRET_POINT_0, to_hex(&sp0).unwrap());
assert_eq!(SECRET_POINT_1, to_hex(&sp1).unwrap());
assert_eq!(SECRET_POINT_2, to_hex(&sp2).unwrap());
}
#[test]
fn test_secret_point_bob_side() {
let pk = PublicKey::from_slice(&from_hex(&ALICE_A0)).unwrap();
let sk0 = PrivateKey::from_slice(&from_hex(&BOB_b0), bitcoin::Network::Bitcoin).unwrap();
let sk1 = PrivateKey::from_slice(&from_hex(&BOB_b1), bitcoin::Network::Bitcoin).unwrap();
let sk2 = PrivateKey::from_slice(&from_hex(&BOB_b2), bitcoin::Network::Bitcoin).unwrap();
let sp0 = secret_point(&sk0, pk).unwrap();
let sp1 = secret_point(&sk1, pk).unwrap();
let sp2 = secret_point(&sk2, pk).unwrap();
assert_eq!(SECRET_POINT_0, to_hex(&sp0).unwrap());
assert_eq!(SECRET_POINT_1, to_hex(&sp1).unwrap());
assert_eq!(SECRET_POINT_2, to_hex(&sp2).unwrap());
}
#[test]
fn test_payment_address_alice_side() {
let alice_seed: Vec<u8> =
bitcoin::hashes::hex::FromHex::from_hex(ALICE_BIP32_SEED).unwrap();
let alice_private = PrivateCode::from_seed(&alice_seed, 0, Network::Bitcoin).unwrap();
let bob_public = PublicCode::from_wif(BOB_PAYMENT_CODE).unwrap();
let addr_0 = bob_public.address(&alice_private, 0, false).unwrap();
let addr_1 = bob_public.address(&alice_private, 1, false).unwrap();
let addr_2 = bob_public.address(&alice_private, 2, false).unwrap();
assert_eq!(BOB_ADDR_0, addr_0.to_string());
assert_eq!(BOB_ADDR_1, addr_1.to_string());
assert_eq!(BOB_ADDR_2, addr_2.to_string());
}
#[test]
fn test_payment_address_bob_side() {
let alice_public = PublicCode::from_wif(ALICE_PAYMENT_CODE).unwrap();
let bob_seed: Vec<u8> = bitcoin::hashes::hex::FromHex::from_hex(BOB_BIP32_SEED).unwrap();
let bob_private = PrivateCode::from_seed(&bob_seed, 0, Network::Bitcoin).unwrap();
let addr_0 = bob_private.address(&alice_public, 0, false).unwrap();
let addr_1 = bob_private.address(&alice_public, 1, false).unwrap();
let addr_2 = bob_private.address(&alice_public, 2, false).unwrap();
assert_eq!(BOB_ADDR_0, addr_0.to_string());
assert_eq!(BOB_ADDR_1, addr_1.to_string());
assert_eq!(BOB_ADDR_2, addr_2.to_string());
}
#[test]
fn test_blinding() {
let bob_public = PublicCode::from_wif(BOB_PAYMENT_CODE).unwrap();
let alice_designated_sk = PrivateKey::from_wif(&ALICE_DESIGNATED_PRIVATE_KEY).unwrap();
let pk = bob_public.child(0).unwrap();
let utxo = bitcoin::OutPoint::from_str(ALICE_NOTIFICATION_UTXO).unwrap();
let blinding_factor = blinding_factor(&alice_designated_sk, &pk, &utxo).unwrap();
assert_eq!(
NOTIFICATION_BLINDING_FACTOR,
to_hex(&blinding_factor).unwrap()
);
let alice_public = PublicCode::from_wif(ALICE_PAYMENT_CODE).unwrap();
let mut alice_bytes = alice_public.as_bytes();
blind_payment_code(&mut alice_bytes, &blinding_factor);
assert_eq!(to_hex(&alice_bytes).unwrap(), ALICE_BLINDED_CODE);
blind_payment_code(&mut alice_bytes, &blinding_factor);
assert_eq!(
PublicCode::try_from_bytes(&alice_bytes)
.unwrap()
.to_string(),
ALICE_PAYMENT_CODE
);
}
#[test]
fn test_make_v1_notification_scripts() {
let alice_public = PublicCode::from_wif(ALICE_PAYMENT_CODE).unwrap();
let bob_public = PublicCode::from_wif(BOB_PAYMENT_CODE).unwrap();
let alice_notification_private_key =
PrivateKey::from_wif(ALICE_DESIGNATED_PRIVATE_KEY).unwrap();
let alice_notification_utxo = bitcoin::OutPoint::from_str(ALICE_NOTIFICATION_UTXO).unwrap();
let (notification_script, op_return_script) = make_v1_notification_scripts(
&alice_public,
&bob_public,
&alice_notification_private_key,
&alice_notification_utxo,
)
.unwrap();
assert_eq!(
to_hex(notification_script.as_bytes()).unwrap(),
NOTIFICATION_SCRIPT
);
assert_eq!(
to_hex(op_return_script.as_bytes()).unwrap(),
OP_RETURN_SCRIPT
);
}
#[test]
fn test_find_designated_in_notification() {
let tx = bitcoin::Transaction::deserialize(&from_hex(NOTIFICATION_TX)).unwrap();
let expected_designated_input =
bitcoin::OutPoint::from_str(ALICE_NOTIFICATION_UTXO).unwrap();
let expected_designated_pk = PrivateKey::from_wif(ALICE_DESIGNATED_PRIVATE_KEY)
.map(|sk| sk.public_key(&Secp256k1::new()))
.unwrap();
let (actual_pk, actual_input) = find_designated(&tx).unwrap();
assert_eq!(expected_designated_input, actual_input);
assert_eq!(expected_designated_pk, actual_pk);
let expected_segwit_input = bitcoin::OutPoint::from_str(
"1fda2a46b57af5ddb087294ed7f98c218311474336fb92638881db71ec6039f6:91",
)
.unwrap();
let expected_segwit_address =
Address::from_str("bc1qpflfdc2fu9e4udp788h0pdrehjf202h75m86s0");
let segwit_tx = bitcoin::Transaction::deserialize(&from_hex("01000000000101f63960ec71db81886392fb3643471183218cf9d74e2987b0ddf57ab5462ada1f5b000000000000000001aa7c0100000000001600145866fcd59dcdabf34dee30abd4c9924ec387830402483045022100f31b80da6c620a2f9d12b65b2010d962390f57560169dde54368b4b5cf122b11022001915d1693cac8bea16e28d941ed7a34eec3bb231a475f5d1616cf5af3f13329012102df62d69f610e2bf7463480a8dd52b96aefeeb3111d66e5e579a0971bc41ce77200000000")).unwrap();
let (actual_segwit_pk, actual_segwit_input) = find_designated(&segwit_tx).unwrap();
assert_eq!(expected_segwit_input, actual_segwit_input);
assert_eq!(
expected_segwit_address,
Address::p2wpkh(&actual_segwit_pk, Network::Bitcoin)
);
}
#[test]
fn test_extract_payment_code_from_tx() {
let tx = bitcoin::Transaction::deserialize(&from_hex(NOTIFICATION_TX)).unwrap();
let bob_seed: Vec<u8> = bitcoin::hashes::hex::FromHex::from_hex(BOB_BIP32_SEED).unwrap();
let bob_private = PrivateCode::from_seed(&bob_seed, 0, Network::Bitcoin).unwrap();
let alice_public = PublicCode::from_notification(&bob_private, None, &tx).unwrap();
assert_eq!(
PublicCode::from_wif(ALICE_PAYMENT_CODE)
.unwrap()
.to_string(),
alice_public.to_string()
);
}
}