zebra_chain/sapling/
arbitrary.rs

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
//! Randomised data generation for sapling types.

use group::Group;
use jubjub::{AffinePoint, ExtendedPoint};
use rand::SeedableRng;
use rand_chacha::ChaChaRng;

use proptest::{collection::vec, prelude::*};

use crate::primitives::Groth16Proof;

use super::{
    keys::{self, ValidatingKey},
    note, tree, FieldNotPresent, NoteCommitment, Output, OutputInTransactionV4, PerSpendAnchor,
    SharedAnchor, Spend,
};

impl Arbitrary for Spend<PerSpendAnchor> {
    type Parameters = ();

    fn arbitrary_with(_args: Self::Parameters) -> Self::Strategy {
        (
            any::<tree::Root>(),
            any::<note::Nullifier>(),
            spendauth_verification_key_bytes(),
            any::<Groth16Proof>(),
            vec(any::<u8>(), 64),
        )
            .prop_map(|(per_spend_anchor, nullifier, rk, proof, sig_bytes)| Self {
                per_spend_anchor,
                cv: ExtendedPoint::generator().try_into().unwrap(),
                nullifier,
                rk,
                zkproof: proof,
                spend_auth_sig: redjubjub::Signature::from({
                    let mut b = [0u8; 64];
                    b.copy_from_slice(sig_bytes.as_slice());
                    b
                }),
            })
            .boxed()
    }

    type Strategy = BoxedStrategy<Self>;
}

impl Arbitrary for Spend<SharedAnchor> {
    type Parameters = ();

    fn arbitrary_with(_args: Self::Parameters) -> Self::Strategy {
        (
            any::<note::Nullifier>(),
            spendauth_verification_key_bytes(),
            any::<Groth16Proof>(),
            vec(any::<u8>(), 64),
        )
            .prop_map(|(nullifier, rk, proof, sig_bytes)| Self {
                per_spend_anchor: FieldNotPresent,
                cv: ExtendedPoint::generator().try_into().unwrap(),
                nullifier,
                rk,
                zkproof: proof,
                spend_auth_sig: redjubjub::Signature::from({
                    let mut b = [0u8; 64];
                    b.copy_from_slice(sig_bytes.as_slice());
                    b
                }),
            })
            .boxed()
    }

    type Strategy = BoxedStrategy<Self>;
}

impl Arbitrary for Output {
    type Parameters = ();

    fn arbitrary_with(_args: Self::Parameters) -> Self::Strategy {
        (
            any::<note::EncryptedNote>(),
            any::<note::WrappedNoteKey>(),
            any::<Groth16Proof>(),
        )
            .prop_map(|(enc_ciphertext, out_ciphertext, zkproof)| Self {
                cv: ExtendedPoint::generator().try_into().unwrap(),
                cm_u: NoteCommitment(AffinePoint::identity()).extract_u(),
                ephemeral_key: keys::EphemeralPublicKey(ExtendedPoint::generator().into()),
                enc_ciphertext,
                out_ciphertext,
                zkproof,
            })
            .boxed()
    }

    type Strategy = BoxedStrategy<Self>;
}

impl Arbitrary for OutputInTransactionV4 {
    type Parameters = ();

    fn arbitrary_with(_args: Self::Parameters) -> Self::Strategy {
        any::<Output>().prop_map(OutputInTransactionV4).boxed()
    }

    type Strategy = BoxedStrategy<Self>;
}

/// Creates Strategy for generation VerificationKeyBytes, since the `redjubjub`
/// crate does not provide an Arbitrary implementation for it.
fn spendauth_verification_key_bytes() -> impl Strategy<Value = ValidatingKey> {
    prop::array::uniform32(any::<u8>()).prop_map(|bytes| {
        let rng = ChaChaRng::from_seed(bytes);
        let sk = redjubjub::SigningKey::<redjubjub::SpendAuth>::new(rng);
        redjubjub::VerificationKey::<redjubjub::SpendAuth>::from(&sk)
            .try_into()
            .unwrap()
    })
}

fn jubjub_base_strat() -> BoxedStrategy<jubjub::Base> {
    (vec(any::<u8>(), 64))
        .prop_map(|bytes| {
            let bytes = bytes.try_into().expect("vec is the correct length");
            jubjub::Base::from_bytes_wide(&bytes)
        })
        .boxed()
}

impl Arbitrary for tree::Root {
    type Parameters = ();

    fn arbitrary_with(_args: Self::Parameters) -> Self::Strategy {
        jubjub_base_strat().prop_map(tree::Root).boxed()
    }

    type Strategy = BoxedStrategy<Self>;
}

impl Arbitrary for tree::Node {
    type Parameters = ();

    fn arbitrary_with(_args: Self::Parameters) -> Self::Strategy {
        jubjub_base_strat().prop_map(tree::Node::from).boxed()
    }

    type Strategy = BoxedStrategy<Self>;
}