zaru-core 0.1.0

A secure payment model engine with transaction state machine and cryptographic verification
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166

use std::sync::Arc;
use tokio::task;

use zaru_core::crypto::ed25519::Keypair;
use zaru_core::settlement::types::SettlementStatus;
use zaru_core::settlement::traits::SettlementLayer;
use zaru_core::ledger::in_memory::InMemorySettlement;
use zaru_core::prelude::*;


#[tokio::test]
async fn test_concurrent_double_spend_attack() {
    let settlement = Arc::new(InMemorySettlement::new());

    let attacker_keys = Keypair::generate();
    let attacker = WalletId::from(&attacker_keys.verifying);

    let victim1 = WalletId::Bank("Victim1".into());
    let victim2 = WalletId::Bank("Victim2".into());

    // FUND attacker
    settlement.deposit(attacker.clone(), Amount::new(100).unwrap());

    let tx1 = Transaction::<Unsigned>::new(
        TxId("tx-1".into()),
        attacker.clone(),
        victim1,
        Amount::new(100).unwrap(),
        1,
    );

    let tx2 = Transaction::<Unsigned>::new(
        TxId("tx-2".into()),
        attacker.clone(),
        victim2,
        Amount::new(100).unwrap(),
        2,
    );

    let verified1 = tx1.sign(&attacker_keys).verify().unwrap();
    let verified2 = tx2.sign(&attacker_keys).verify().unwrap();

    let s1 = Arc::clone(&settlement);
    let s2 = Arc::clone(&settlement);

    let handle1 = task::spawn(async move { s1.submit(verified1).await });

    let handle2 = task::spawn(async move { s2.submit(verified2).await });

    let r1 = handle1.await.unwrap();
    let r2 = handle2.await.unwrap();

    let success_count = [r1.is_ok(), r2.is_ok()].iter().filter(|&&x| x).count();

    assert_eq!(success_count, 1, "Double spend occurred");
}

#[tokio::test]
async fn test_replay_attack_same_nonce_different_txid() {
    let settlement = InMemorySettlement::new();

    let keypair = Keypair::generate();
    let from = WalletId::from(&keypair.verifying);
    let to = WalletId::Bank("Victim".into());

    settlement.deposit(from.clone(), Amount::new(200).unwrap());

    let amount = Amount::new(100).unwrap();

    let tx1 = Transaction::<Unsigned>::new(
        TxId("tx-1".into()),
        from.clone(),
        to.clone(),
        amount.clone(),
        42,
    );

    let tx2 = Transaction::<Unsigned>::new(TxId("tx-2".into()), from, to, amount, 42);

    let verified1 = tx1.sign(&keypair).verify().unwrap();
    let verified2 = tx2.sign(&keypair).verify().unwrap();

    let _ = settlement.submit(verified1).await.unwrap();
    let result = settlement.submit(verified2).await;

    assert!(result.is_err(), "Replay attack via nonce was not prevented");
}

#[tokio::test]
async fn test_replay_attack_same_transaction() {
    let settlement = InMemorySettlement::new();

    let keypair = Keypair::generate();
    let from = WalletId::from(&keypair.verifying);
    let to = WalletId::Bank("Victim".into());

    settlement.deposit(from.clone(), Amount::new(100).unwrap());

    let tx = Transaction::<Unsigned>::new(
        TxId("tx-replay".into()),
        from,
        to,
        Amount::new(100).unwrap(),
        1,
    );

    let verified = tx.sign(&keypair).verify().unwrap();

    let id1 = settlement.submit(verified.clone()).await.unwrap();
    let id2 = settlement.submit(verified.clone()).await.unwrap();
    let id3 = settlement.submit(verified).await.unwrap();

    assert_eq!(id1, id2);
    assert_eq!(id2, id3);

    let final_status = settlement.await_finality(&id1).await.unwrap();

    assert_eq!(final_status, SettlementStatus::Finalized);
}

#[tokio::test]
async fn test_full_settlement_flow() {
    let settlement = InMemorySettlement::new();

    let keypair = Keypair::generate();
    let from = WalletId::from(&keypair.verifying);
    let to = WalletId::Bank("Linda".into());

    settlement.deposit(from.clone(), Amount::new(100).unwrap());

    let tx =
        Transaction::<Unsigned>::new(TxId("tx-1".into()), from, to, Amount::new(100).unwrap(), 1);

    let verified = tx.sign(&keypair).verify().unwrap();

    let tx_id = settlement.submit(verified).await.unwrap();
    let final_status = settlement.await_finality(&tx_id).await.unwrap();

    assert_eq!(final_status, SettlementStatus::Finalized);
}

#[tokio::test]
async fn test_idempotent_submission() {
    let settlement = InMemorySettlement::new();

    let keypair = Keypair::generate();
    let from = WalletId::from(&keypair.verifying);
    let to = WalletId::Bank("Linda".into());

    settlement.deposit(from.clone(), Amount::new(100).unwrap());

    let tx = Transaction::<Unsigned>::new(
        TxId("tx-dup".into()),
        from,
        to,
        Amount::new(100).unwrap(),
        1,
    );

    let verified = tx.sign(&keypair).verify().unwrap();

    let id1 = settlement.submit(verified.clone()).await.unwrap();
    let id2 = settlement.submit(verified).await.unwrap();

    assert_eq!(id1, id2);
}