libsignal-protocol 0.1.0

An idiomatic high-level interface to the libsignal-protocol-c crate.
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
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

use crate::{errors::FromInternalErrorCode, keys::KeyPair, raw_ptr::Raw};
use failure::Error;
use std::{
    fmt::{self, Debug, Formatter},
    ptr,
    time::{Duration, SystemTime},
};

/// A signed pre-key.
#[derive(Clone)]
pub struct SessionSignedPreKey {
    pub(crate) raw: Raw<sys::session_signed_pre_key>,
}

impl SessionSignedPreKey {
    /// Create a new [`SessionSignedPreKey`] out of an existing [`KeyPair`] and
    /// its signature.
    pub fn new(
        id: u32,
        timestamp: SystemTime,
        key_pair: &KeyPair,
        signature: &[u8],
    ) -> Result<SessionSignedPreKey, Error> {
        unsafe {
            let mut raw = ptr::null_mut();
            let elapsed = timestamp.duration_since(SystemTime::UNIX_EPOCH)?;

            sys::session_signed_pre_key_create(
                &mut raw,
                id,
                elapsed.as_secs(),
                key_pair.raw.as_ptr(),
                signature.as_ptr(),
                signature.len(),
            )
            .into_result()?;

            Ok(SessionSignedPreKey {
                raw: Raw::from_ptr(raw),
            })
        }
    }

    /// Get the signed pre-key's ID.
    pub fn id(&self) -> u32 {
        unsafe { sys::session_signed_pre_key_get_id(self.raw.as_const_ptr()) }
    }

    /// When was this key signed?
    pub fn timestamp(&self) -> SystemTime {
        unsafe {
            let ts = sys::session_signed_pre_key_get_timestamp(
                self.raw.as_const_ptr(),
            );
            SystemTime::UNIX_EPOCH + Duration::from_secs(ts)
        }
    }

    /// Get the key pair which has been signed.
    pub fn key_pair(&self) -> KeyPair {
        unsafe {
            let raw = sys::session_signed_pre_key_get_key_pair(
                self.raw.as_const_ptr(),
            );
            assert!(!raw.is_null());
            KeyPair {
                raw: Raw::copied_from(raw),
            }
        }
    }

    /// Get the signature.
    pub fn signature(&self) -> &[u8] {
        unsafe {
            let len = sys::session_signed_pre_key_get_signature_len(
                self.raw.as_const_ptr(),
            );
            let ptr = sys::session_signed_pre_key_get_signature(
                self.raw.as_const_ptr(),
            );

            std::slice::from_raw_parts(ptr, len)
        }
    }
}

impl_serializable!(SessionSignedPreKey, session_signed_pre_key_serialize, foo);

impl Debug for SessionSignedPreKey {
    fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
        f.debug_struct("SessionSignedPreKey")
            .field("key_pair", &self.key_pair())
            .field("id", &self.id())
            .field("timestamp", &self.timestamp())
            .finish()
    }
}