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

//
// Wildland Project
//
// Copyright © 2022 Golem Foundation
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License version 3 as published by
// the Free Software Foundation.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.

use crypto_box::{PublicKey, SecretKey};
use hex::ToHex;

use super::bytes_key_from_str;
use crate::error::CryptoError;

/// Keypair that can be used for encryption.
/// See crypto-box crate for details.
#[derive(Debug)]
pub struct EncryptingKeypair {
    pub secret: SecretKey,
    pub public: PublicKey,
}

impl EncryptingKeypair {
    pub fn from_bytes_slices(pubkey: [u8; 32], seckey: [u8; 32]) -> Self {
        Self {
            secret: SecretKey::from(seckey),
            public: PublicKey::from(pubkey),
        }
    }

    pub fn from_str(public_key: &str, secret_key: &str) -> Result<Self, CryptoError> {
        let pubkey = bytes_key_from_str(public_key)?;
        let seckey = bytes_key_from_str(secret_key)?;
        Ok(Self::from_bytes_slices(pubkey, seckey))
    }

    /// Creates a randomly generated (non-deterministic) encryption keypair.
    /// This keypair can be used as Single-use Transient Encryption Keypair (STEK).
    pub fn new() -> Self {
        let mut rng = rand_core::OsRng;
        let secret = SecretKey::generate(&mut rng);
        let public = secret.public_key();
        Self { secret, public }
    }

    pub fn encode_pub(&self) -> String {
        self.public.as_bytes().encode_hex::<String>()
    }
}

impl Default for EncryptingKeypair {
    fn default() -> Self {
        Self::new()
    }
}