zebra-chain 6.0.2

Core Zcash data structures
Documentation 
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

//! Sprout message authentication codes.

use std::io::{self, Read};

use crate::{
    fmt::HexDebug,
    serialization::{ReadZcashExt, SerializationError, ZcashDeserialize, ZcashSerialize},
};

/// A sequence of message authentication tags ...
///
/// binding h_sig to each a_sk of the JoinSplit description, computed as
/// described in ยง 4.10 'Non-malleability (Sprout)' on p. 37
#[derive(PartialEq, Eq, Clone, Debug, Serialize, Deserialize)]
#[cfg_attr(
    any(test, feature = "proptest-impl"),
    derive(proptest_derive::Arbitrary)
)]
pub struct Mac(HexDebug<[u8; 32]>);

impl Mac {
    /// Return the bytes in big-endian byte order as required
    /// by RPCs such as `getrawtransaction`.
    pub fn bytes_in_display_order(&self) -> [u8; 32] {
        let mut root: [u8; 32] = self.into();
        root.reverse();
        root
    }
}

impl From<[u8; 32]> for Mac {
    fn from(bytes: [u8; 32]) -> Self {
        Self(bytes.into())
    }
}

impl From<Mac> for [u8; 32] {
    fn from(rt: Mac) -> [u8; 32] {
        *rt.0
    }
}

impl From<&Mac> for [u8; 32] {
    fn from(mac: &Mac) -> Self {
        mac.clone().into()
    }
}

impl ZcashDeserialize for Mac {
    fn zcash_deserialize<R: Read>(mut reader: R) -> Result<Self, SerializationError> {
        let bytes = reader.read_32_bytes()?;

        Ok(Self(bytes.into()))
    }
}

impl ZcashSerialize for Mac {
    fn zcash_serialize<W: io::Write>(&self, mut writer: W) -> Result<(), io::Error> {
        writer.write_all(&self.0[..])
    }
}