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

//
// Copyright 2020-2022 Signal Messenger, LLC.
// SPDX-License-Identifier: AGPL-3.0-only
//

use std::fmt;

use prost::Message;

use crate::proto::storage::PreKeyRecordStructure;
use crate::{KeyPair, PrivateKey, PublicKey, Result, SignalProtocolError};

/// A unique identifier selecting among this client's known pre-keys.
#[derive(Copy, Clone, Debug, Hash, Eq, PartialEq, Ord, PartialOrd)]
pub struct PreKeyId(u32);

impl From<u32> for PreKeyId {
    fn from(value: u32) -> Self {
        Self(value)
    }
}

impl From<PreKeyId> for u32 {
    fn from(value: PreKeyId) -> Self {
        value.0
    }
}

impl fmt::Display for PreKeyId {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "{}", self.0)
    }
}

#[derive(Debug, Clone)]
pub struct PreKeyRecord {
    pre_key: PreKeyRecordStructure,
}

impl PreKeyRecord {
    pub fn new(id: PreKeyId, key: &KeyPair) -> Self {
        let public_key = key.public_key.serialize().to_vec();
        let private_key = key.private_key.serialize().to_vec();
        Self {
            pre_key: PreKeyRecordStructure {
                id: id.into(),
                public_key,
                private_key,
            },
        }
    }

    pub fn deserialize(data: &[u8]) -> Result<Self> {
        Ok(Self {
            pre_key: PreKeyRecordStructure::decode(data)
                .map_err(|_| SignalProtocolError::InvalidProtobufEncoding)?,
        })
    }

    pub fn id(&self) -> Result<PreKeyId> {
        Ok(self.pre_key.id.into())
    }

    pub fn key_pair(&self) -> Result<KeyPair> {
        KeyPair::from_public_and_private(&self.pre_key.public_key, &self.pre_key.private_key)
    }

    pub fn public_key(&self) -> Result<PublicKey> {
        PublicKey::deserialize(&self.pre_key.public_key)
    }

    pub fn private_key(&self) -> Result<PrivateKey> {
        PrivateKey::deserialize(&self.pre_key.private_key)
    }

    pub fn serialize(&self) -> Result<Vec<u8>> {
        Ok(self.pre_key.encode_to_vec())
    }
}