2018-02-18 08:59:15 -08:00
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//! The `log` crate provides the foundational data structures for Proof-of-History,
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//! an ordered log of events in time.
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2018-02-15 09:13:56 -08:00
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2018-02-18 08:59:15 -08:00
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/// Each log entry contains three pieces of data. The 'num_hashes' field is the number
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/// of hashes performed since the previous entry. The 'end_hash' field is the result
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/// of hashing 'end_hash' from the previous entry 'num_hashes' times. The 'event'
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/// field points to an Event that took place shortly after 'end_hash' was generated.
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2018-02-15 09:13:56 -08:00
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///
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2018-02-15 09:48:30 -08:00
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/// If you divide 'num_hashes' by the amount of time it takes to generate a new hash, you
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2018-02-15 09:13:56 -08:00
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/// get a duration estimate since the last event. Since processing power increases
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2018-02-15 09:48:30 -08:00
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/// over time, one should expect the duration 'num_hashes' represents to decrease proportionally.
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2018-02-15 09:13:56 -08:00
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/// Though processing power varies across nodes, the network gives priority to the
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/// fastest processor. Duration should therefore be estimated by assuming that the hash
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/// was generated by the fastest processor at the time the entry was logged.
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2018-02-19 15:17:13 -08:00
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2018-02-20 15:26:11 -08:00
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use generic_array::GenericArray;
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2018-02-24 05:53:36 -08:00
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use generic_array::typenum::{U32, U64};
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use ring::signature::Ed25519KeyPair;
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2018-02-19 15:17:13 -08:00
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pub type Sha256Hash = GenericArray<u8, U32>;
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2018-02-24 05:53:36 -08:00
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pub type PublicKey = GenericArray<u8, U32>;
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pub type Signature = GenericArray<u8, U64>;
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2018-02-19 15:17:13 -08:00
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2018-02-20 15:26:11 -08:00
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#[derive(Serialize, Deserialize, Debug, PartialEq, Eq, Clone)]
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2018-02-26 14:37:33 -08:00
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pub struct Entry<T> {
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2018-02-15 09:57:32 -08:00
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pub num_hashes: u64,
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2018-02-19 15:17:13 -08:00
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pub end_hash: Sha256Hash,
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2018-02-26 14:37:33 -08:00
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pub event: Event<T>,
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2018-02-15 09:57:32 -08:00
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}
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2018-02-18 08:53:38 -08:00
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/// When 'event' is Tick, the event represents a simple clock tick, and exists for the
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2018-02-15 09:13:56 -08:00
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/// sole purpose of improving the performance of event log verification. A tick can
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2018-02-16 08:56:10 -08:00
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/// be generated in 'num_hashes' hashes and verified in 'num_hashes' hashes. By logging
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/// a hash alongside the tick, each tick and be verified in parallel using the 'end_hash'
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/// of the preceding tick to seed its hashing.
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2018-02-20 15:26:11 -08:00
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#[derive(Serialize, Deserialize, Debug, PartialEq, Eq, Clone)]
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2018-02-26 14:31:01 -08:00
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pub enum Event<T> {
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2018-02-15 09:57:32 -08:00
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Tick,
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2018-02-24 10:15:03 -08:00
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Discovery {
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2018-02-26 14:31:01 -08:00
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data: T,
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2018-02-24 10:15:03 -08:00
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},
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Claim {
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key: PublicKey,
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2018-02-26 14:31:01 -08:00
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data: T,
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2018-02-24 05:53:36 -08:00
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sig: Signature,
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},
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2018-02-26 10:01:19 -08:00
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Transaction {
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from: PublicKey,
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to: PublicKey,
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2018-02-26 14:31:01 -08:00
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data: T,
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2018-02-26 10:01:19 -08:00
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sig: Signature,
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},
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2018-02-15 09:13:56 -08:00
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}
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2018-02-26 14:37:33 -08:00
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impl<T> Entry<T> {
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2018-02-18 08:53:38 -08:00
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/// Creates a Entry from the number of hashes 'num_hashes' since the previous event
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2018-02-15 09:48:30 -08:00
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/// and that resulting 'end_hash'.
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2018-02-19 15:17:13 -08:00
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pub fn new_tick(num_hashes: u64, end_hash: &Sha256Hash) -> Self {
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2018-02-18 08:53:38 -08:00
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Entry {
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2018-02-15 09:48:30 -08:00
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num_hashes,
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2018-02-19 15:17:13 -08:00
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end_hash: *end_hash,
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2018-02-20 12:07:54 -08:00
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event: Event::Tick,
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2018-02-15 09:48:30 -08:00
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}
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2018-02-15 09:13:56 -08:00
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}
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2018-02-15 10:45:04 -08:00
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}
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2018-02-26 10:01:19 -08:00
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// Return a new ED25519 keypair
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pub fn generate_keypair() -> Ed25519KeyPair {
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use ring::{rand, signature};
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use untrusted;
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let rng = rand::SystemRandom::new();
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let pkcs8_bytes = signature::Ed25519KeyPair::generate_pkcs8(&rng).unwrap();
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signature::Ed25519KeyPair::from_pkcs8(untrusted::Input::from(&pkcs8_bytes)).unwrap()
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}
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2018-02-24 05:53:36 -08:00
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/// Return a Claim Event for the given hash and key-pair.
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2018-02-26 14:31:01 -08:00
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pub fn sign_hash(data: &Sha256Hash, keypair: &Ed25519KeyPair) -> Event<Sha256Hash> {
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2018-02-26 10:01:19 -08:00
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let sig = keypair.sign(data);
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let peer_public_key_bytes = keypair.public_key_bytes();
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2018-02-24 05:53:36 -08:00
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let sig_bytes = sig.as_ref();
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Event::Claim {
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key: GenericArray::clone_from_slice(peer_public_key_bytes),
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data: GenericArray::clone_from_slice(data),
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sig: GenericArray::clone_from_slice(sig_bytes),
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}
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}
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2018-02-26 10:01:19 -08:00
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/// Return a Transaction Event that indicates a transfer in ownership of the given hash.
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2018-02-26 14:31:01 -08:00
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pub fn transfer_hash(
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data: &Sha256Hash,
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keypair: &Ed25519KeyPair,
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to: PublicKey,
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) -> Event<Sha256Hash> {
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2018-02-26 10:01:19 -08:00
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let from_public_key_bytes = keypair.public_key_bytes();
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let mut sign_data = data.to_vec();
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sign_data.extend_from_slice(&to);
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let sig = keypair.sign(&sign_data);
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let sig_bytes = sig.as_ref();
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Event::Transaction {
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from: GenericArray::clone_from_slice(from_public_key_bytes),
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to,
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data: GenericArray::clone_from_slice(data),
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sig: GenericArray::clone_from_slice(sig_bytes),
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}
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}
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2018-02-24 05:53:36 -08:00
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/// Return a Sha256 hash for the given data.
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2018-02-19 15:17:13 -08:00
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pub fn hash(val: &[u8]) -> Sha256Hash {
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use sha2::{Digest, Sha256};
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let mut hasher = Sha256::default();
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hasher.input(val);
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hasher.result()
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2018-02-19 11:09:56 -08:00
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}
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2018-02-20 12:07:54 -08:00
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/// Return the hash of the given hash extended with the given value.
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2018-02-24 05:53:36 -08:00
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pub fn extend_and_hash(end_hash: &Sha256Hash, ty: u8, val: &[u8]) -> Sha256Hash {
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2018-02-20 12:07:54 -08:00
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let mut hash_data = end_hash.to_vec();
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2018-02-24 05:53:36 -08:00
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hash_data.push(ty);
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2018-02-20 12:07:54 -08:00
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hash_data.extend_from_slice(val);
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hash(&hash_data)
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}
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2018-02-26 14:31:01 -08:00
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pub fn hash_event(end_hash: &Sha256Hash, event: &Event<Sha256Hash>) -> Sha256Hash {
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2018-02-24 05:53:36 -08:00
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match *event {
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Event::Tick => *end_hash,
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2018-02-24 10:15:03 -08:00
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Event::Discovery { data } => extend_and_hash(end_hash, 1, &data),
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2018-02-24 05:53:36 -08:00
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Event::Claim { key, data, sig } => {
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let mut event_data = data.to_vec();
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event_data.extend_from_slice(&sig);
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event_data.extend_from_slice(&key);
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extend_and_hash(end_hash, 2, &event_data)
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}
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2018-02-26 10:01:19 -08:00
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Event::Transaction {
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from,
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to,
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data,
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sig,
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} => {
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let mut event_data = data.to_vec();
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event_data.extend_from_slice(&sig);
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event_data.extend_from_slice(&from);
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event_data.extend_from_slice(&to);
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extend_and_hash(end_hash, 2, &event_data)
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}
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2018-02-24 05:53:36 -08:00
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}
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}
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2018-02-26 14:31:01 -08:00
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pub fn next_hash(
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start_hash: &Sha256Hash,
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num_hashes: u64,
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event: &Event<Sha256Hash>,
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) -> Sha256Hash {
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2018-02-19 15:17:13 -08:00
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let mut end_hash = *start_hash;
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2018-02-15 10:45:04 -08:00
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for _ in 0..num_hashes {
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2018-02-19 15:17:13 -08:00
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end_hash = hash(&end_hash);
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2018-02-15 09:13:56 -08:00
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}
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2018-02-24 05:53:36 -08:00
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hash_event(&end_hash, event)
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2018-02-20 12:07:54 -08:00
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}
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/// Creates the next Tick Entry 'num_hashes' after 'start_hash'.
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2018-02-26 14:37:33 -08:00
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pub fn next_entry(
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start_hash: &Sha256Hash,
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num_hashes: u64,
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event: Event<Sha256Hash>,
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) -> Entry<Sha256Hash> {
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2018-02-20 12:07:54 -08:00
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Entry {
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num_hashes,
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end_hash: next_hash(start_hash, num_hashes, &event),
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event,
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}
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}
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2018-02-26 14:31:01 -08:00
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pub fn next_entry_mut(
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start_hash: &mut Sha256Hash,
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num_hashes: u64,
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event: Event<Sha256Hash>,
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2018-02-26 14:37:33 -08:00
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) -> Entry<Sha256Hash> {
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2018-02-26 10:01:19 -08:00
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let entry = next_entry(start_hash, num_hashes, event);
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*start_hash = entry.end_hash;
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entry
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}
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2018-02-20 12:07:54 -08:00
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/// Creates the next Tick Entry 'num_hashes' after 'start_hash'.
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2018-02-26 14:37:33 -08:00
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pub fn next_tick(start_hash: &Sha256Hash, num_hashes: u64) -> Entry<Sha256Hash> {
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2018-02-20 12:07:54 -08:00
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next_entry(start_hash, num_hashes, Event::Tick)
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2018-02-15 09:13:56 -08:00
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}
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2018-02-26 13:39:01 -08:00
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/// Verifies self.end_hash is the result of hashing a 'start_hash' 'self.num_hashes' times.
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/// If the event is not a Tick, then hash that as well.
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2018-02-26 14:37:33 -08:00
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pub fn verify_entry(entry: &Entry<Sha256Hash>, start_hash: &Sha256Hash) -> bool {
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2018-02-26 13:39:01 -08:00
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if let Event::Claim { key, data, sig } = entry.event {
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if !verify_signature(&key, &data, &sig) {
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return false;
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}
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}
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if let Event::Transaction {
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from,
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to,
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data,
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sig,
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} = entry.event
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{
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let mut sign_data = data.to_vec();
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sign_data.extend_from_slice(&to);
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if !verify_signature(&from, &sign_data, &sig) {
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return false;
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}
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}
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entry.end_hash == next_hash(start_hash, entry.num_hashes, &entry.event)
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}
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2018-02-15 09:13:56 -08:00
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/// Verifies the hashes and counts of a slice of events are all consistent.
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2018-02-26 14:37:33 -08:00
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pub fn verify_slice(events: &[Entry<Sha256Hash>], start_hash: &Sha256Hash) -> bool {
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2018-02-15 09:13:56 -08:00
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use rayon::prelude::*;
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2018-02-19 15:17:13 -08:00
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let genesis = [Entry::new_tick(Default::default(), start_hash)];
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2018-02-15 09:13:56 -08:00
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let event_pairs = genesis.par_iter().chain(events).zip(events);
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2018-02-26 13:39:01 -08:00
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event_pairs.all(|(x0, x1)| verify_entry(&x1, &x0.end_hash))
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2018-02-15 09:13:56 -08:00
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}
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/// Verifies the hashes and events serially. Exists only for reference.
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2018-02-26 14:37:33 -08:00
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pub fn verify_slice_seq(events: &[Entry<Sha256Hash>], start_hash: &Sha256Hash) -> bool {
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2018-02-18 08:53:38 -08:00
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let genesis = [Entry::new_tick(0, start_hash)];
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2018-02-15 15:00:05 -08:00
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let mut event_pairs = genesis.iter().chain(events).zip(events);
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2018-02-26 13:39:01 -08:00
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event_pairs.all(|(x0, x1)| verify_entry(&x1, &x0.end_hash))
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2018-02-15 09:13:56 -08:00
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}
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2018-02-24 05:53:36 -08:00
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/// Verify a signed message with the given public key.
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pub fn verify_signature(peer_public_key_bytes: &[u8], msg_bytes: &[u8], sig_bytes: &[u8]) -> bool {
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use untrusted;
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use ring::signature;
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let peer_public_key = untrusted::Input::from(peer_public_key_bytes);
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let msg = untrusted::Input::from(msg_bytes);
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let sig = untrusted::Input::from(sig_bytes);
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signature::verify(&signature::ED25519, peer_public_key, msg, sig).is_ok()
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}
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2018-02-26 14:31:01 -08:00
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pub fn create_entries(
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start_hash: &Sha256Hash,
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num_hashes: u64,
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events: &[Event<Sha256Hash>],
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2018-02-26 14:37:33 -08:00
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) -> Vec<Entry<Sha256Hash>> {
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2018-02-26 10:01:19 -08:00
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let mut end_hash = *start_hash;
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events
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.iter()
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.map(|event| next_entry_mut(&mut end_hash, num_hashes, event.clone()))
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.collect()
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}
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2018-02-15 10:50:48 -08:00
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/// Create a vector of Ticks of length 'len' from 'start_hash' hash and 'num_hashes'.
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2018-02-26 14:37:33 -08:00
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pub fn create_ticks(
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start_hash: &Sha256Hash,
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num_hashes: u64,
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len: usize,
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) -> Vec<Entry<Sha256Hash>> {
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2018-02-20 12:07:54 -08:00
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use std::iter;
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let mut end_hash = *start_hash;
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iter::repeat(Event::Tick)
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.take(len)
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2018-02-26 10:01:19 -08:00
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.map(|event| next_entry_mut(&mut end_hash, num_hashes, event))
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2018-02-20 12:07:54 -08:00
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.collect()
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2018-02-15 09:13:56 -08:00
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}
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2018-02-15 16:47:05 -08:00
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn test_event_verify() {
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2018-02-19 15:17:13 -08:00
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let zero = Sha256Hash::default();
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let one = hash(&zero);
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2018-02-26 13:39:01 -08:00
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assert!(verify_entry(&Entry::new_tick(0, &zero), &zero)); // base case
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assert!(!verify_entry(&Entry::new_tick(0, &zero), &one)); // base case, bad
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assert!(verify_entry(&next_tick(&zero, 1), &zero)); // inductive step
|
|
|
|
assert!(!verify_entry(&next_tick(&zero, 1), &one)); // inductive step, bad
|
2018-02-15 16:47:05 -08:00
|
|
|
}
|
|
|
|
|
|
|
|
#[test]
|
|
|
|
fn test_next_tick() {
|
2018-02-19 15:17:13 -08:00
|
|
|
let zero = Sha256Hash::default();
|
|
|
|
assert_eq!(next_tick(&zero, 1).num_hashes, 1)
|
2018-02-15 16:47:05 -08:00
|
|
|
}
|
|
|
|
|
2018-02-26 14:37:33 -08:00
|
|
|
fn verify_slice_generic(verify_slice: fn(&[Entry<Sha256Hash>], &Sha256Hash) -> bool) {
|
2018-02-19 15:17:13 -08:00
|
|
|
let zero = Sha256Hash::default();
|
|
|
|
let one = hash(&zero);
|
|
|
|
assert!(verify_slice(&vec![], &zero)); // base case
|
|
|
|
assert!(verify_slice(&vec![Entry::new_tick(0, &zero)], &zero)); // singleton case 1
|
|
|
|
assert!(!verify_slice(&vec![Entry::new_tick(0, &zero)], &one)); // singleton case 2, bad
|
|
|
|
assert!(verify_slice(&create_ticks(&zero, 0, 2), &zero)); // inductive step
|
|
|
|
|
|
|
|
let mut bad_ticks = create_ticks(&zero, 0, 2);
|
|
|
|
bad_ticks[1].end_hash = one;
|
|
|
|
assert!(!verify_slice(&bad_ticks, &zero)); // inductive step, bad
|
2018-02-16 08:14:42 -08:00
|
|
|
}
|
|
|
|
|
|
|
|
#[test]
|
|
|
|
fn test_verify_slice() {
|
|
|
|
verify_slice_generic(verify_slice);
|
2018-02-15 16:47:05 -08:00
|
|
|
}
|
2018-02-16 08:14:42 -08:00
|
|
|
|
|
|
|
#[test]
|
|
|
|
fn test_verify_slice_seq() {
|
|
|
|
verify_slice_generic(verify_slice_seq);
|
|
|
|
}
|
|
|
|
|
2018-02-20 13:46:36 -08:00
|
|
|
#[test]
|
|
|
|
fn test_reorder_attack() {
|
|
|
|
let zero = Sha256Hash::default();
|
|
|
|
let one = hash(&zero);
|
|
|
|
|
2018-02-24 04:18:59 -08:00
|
|
|
// First, verify Discovery events
|
2018-02-24 10:15:03 -08:00
|
|
|
let events = [
|
|
|
|
Event::Discovery { data: zero },
|
|
|
|
Event::Discovery { data: one },
|
|
|
|
];
|
2018-02-26 10:01:19 -08:00
|
|
|
let mut entries = create_entries(&zero, 0, &events);
|
2018-02-24 05:53:36 -08:00
|
|
|
assert!(verify_slice(&entries, &zero));
|
2018-02-20 13:46:36 -08:00
|
|
|
|
2018-02-24 04:18:59 -08:00
|
|
|
// Next, swap two Discovery events and ensure verification fails.
|
2018-02-20 13:46:36 -08:00
|
|
|
let event0 = entries[0].event.clone();
|
|
|
|
let event1 = entries[1].event.clone();
|
|
|
|
entries[0].event = event1;
|
|
|
|
entries[1].event = event0;
|
2018-02-24 05:53:36 -08:00
|
|
|
assert!(!verify_slice(&entries, &zero));
|
2018-02-20 13:46:36 -08:00
|
|
|
}
|
|
|
|
|
2018-02-24 05:53:36 -08:00
|
|
|
#[test]
|
2018-02-26 10:01:19 -08:00
|
|
|
fn test_claim() {
|
|
|
|
let keypair = generate_keypair();
|
|
|
|
let event0 = sign_hash(&hash(b"hello, world"), &keypair);
|
2018-02-24 05:53:36 -08:00
|
|
|
let zero = Sha256Hash::default();
|
2018-02-26 10:01:19 -08:00
|
|
|
let entries = create_entries(&zero, 0, &[event0]);
|
2018-02-24 05:53:36 -08:00
|
|
|
assert!(verify_slice(&entries, &zero));
|
|
|
|
}
|
2018-02-24 09:27:51 -08:00
|
|
|
|
|
|
|
#[test]
|
2018-02-26 10:01:19 -08:00
|
|
|
fn test_wrong_data_claim_attack() {
|
|
|
|
let keypair = generate_keypair();
|
|
|
|
let mut event0 = sign_hash(&hash(b"hello, world"), &keypair);
|
2018-02-24 09:27:51 -08:00
|
|
|
if let Event::Claim { key, sig, .. } = event0 {
|
2018-02-26 10:01:19 -08:00
|
|
|
let data = hash(b"goodbye cruel world");
|
2018-02-24 09:27:51 -08:00
|
|
|
event0 = Event::Claim { key, data, sig };
|
|
|
|
}
|
|
|
|
let zero = Sha256Hash::default();
|
2018-02-26 10:01:19 -08:00
|
|
|
let entries = create_entries(&zero, 0, &[event0]);
|
|
|
|
assert!(!verify_slice(&entries, &zero));
|
|
|
|
}
|
|
|
|
|
|
|
|
#[test]
|
|
|
|
fn test_transfer() {
|
|
|
|
let keypair0 = generate_keypair();
|
|
|
|
let keypair1 = generate_keypair();
|
|
|
|
let pubkey1 = GenericArray::clone_from_slice(keypair1.public_key_bytes());
|
|
|
|
let event0 = transfer_hash(&hash(b"hello, world"), &keypair0, pubkey1);
|
|
|
|
let zero = Sha256Hash::default();
|
|
|
|
let entries = create_entries(&zero, 0, &[event0]);
|
|
|
|
assert!(verify_slice(&entries, &zero));
|
|
|
|
}
|
|
|
|
|
|
|
|
#[test]
|
|
|
|
fn test_wrong_data_transfer_attack() {
|
|
|
|
let keypair0 = generate_keypair();
|
|
|
|
let keypair1 = generate_keypair();
|
|
|
|
let pubkey1 = GenericArray::clone_from_slice(keypair1.public_key_bytes());
|
|
|
|
let mut event0 = transfer_hash(&hash(b"hello, world"), &keypair0, pubkey1);
|
|
|
|
if let Event::Transaction { from, to, sig, .. } = event0 {
|
|
|
|
let data = hash(b"goodbye cruel world");
|
|
|
|
event0 = Event::Transaction {
|
|
|
|
from,
|
|
|
|
to,
|
|
|
|
data,
|
|
|
|
sig,
|
|
|
|
};
|
|
|
|
}
|
|
|
|
let zero = Sha256Hash::default();
|
|
|
|
let entries = create_entries(&zero, 0, &[event0]);
|
|
|
|
assert!(!verify_slice(&entries, &zero));
|
|
|
|
}
|
|
|
|
|
|
|
|
#[test]
|
|
|
|
fn test_transfer_hijack_attack() {
|
|
|
|
let keypair0 = generate_keypair();
|
|
|
|
let keypair1 = generate_keypair();
|
|
|
|
let pubkey1 = GenericArray::clone_from_slice(keypair1.public_key_bytes());
|
|
|
|
let mut event0 = transfer_hash(&hash(b"hello, world"), &keypair0, pubkey1);
|
|
|
|
if let Event::Transaction {
|
|
|
|
from, data, sig, ..
|
|
|
|
} = event0
|
|
|
|
{
|
|
|
|
let theif_keypair = generate_keypair();
|
|
|
|
let to = GenericArray::clone_from_slice(theif_keypair.public_key_bytes());
|
|
|
|
event0 = Event::Transaction {
|
|
|
|
from,
|
|
|
|
to,
|
|
|
|
data,
|
|
|
|
sig,
|
|
|
|
};
|
|
|
|
}
|
|
|
|
let zero = Sha256Hash::default();
|
|
|
|
let entries = create_entries(&zero, 0, &[event0]);
|
2018-02-24 09:27:51 -08:00
|
|
|
assert!(!verify_slice(&entries, &zero));
|
|
|
|
}
|
2018-02-15 16:47:05 -08:00
|
|
|
}
|
|
|
|
|
2018-02-15 09:13:56 -08:00
|
|
|
#[cfg(all(feature = "unstable", test))]
|
|
|
|
mod bench {
|
|
|
|
extern crate test;
|
|
|
|
use self::test::Bencher;
|
2018-02-18 08:59:15 -08:00
|
|
|
use log::*;
|
2018-02-15 09:13:56 -08:00
|
|
|
|
|
|
|
#[bench]
|
|
|
|
fn event_bench(bencher: &mut Bencher) {
|
2018-02-19 15:17:13 -08:00
|
|
|
let start_hash = Default::default();
|
2018-02-19 15:51:32 -08:00
|
|
|
let events = create_ticks(&start_hash, 10_000, 8);
|
2018-02-16 09:38:12 -08:00
|
|
|
bencher.iter(|| {
|
2018-02-19 15:17:13 -08:00
|
|
|
assert!(verify_slice(&events, &start_hash));
|
2018-02-16 09:38:12 -08:00
|
|
|
});
|
|
|
|
}
|
|
|
|
|
|
|
|
#[bench]
|
|
|
|
fn event_bench_seq(bencher: &mut Bencher) {
|
2018-02-19 15:17:13 -08:00
|
|
|
let start_hash = Default::default();
|
2018-02-19 15:51:32 -08:00
|
|
|
let events = create_ticks(&start_hash, 10_000, 8);
|
2018-02-15 09:13:56 -08:00
|
|
|
bencher.iter(|| {
|
2018-02-19 15:17:13 -08:00
|
|
|
assert!(verify_slice_seq(&events, &start_hash));
|
2018-02-15 09:13:56 -08:00
|
|
|
});
|
|
|
|
}
|
|
|
|
}
|