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// Copyright 2017-2019 int08h LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
use crate::message::RtMessage;
use crate::sign::Signer;
use crate::tag::Tag;
use time::Timespec;
use byteorder::{LittleEndian, WriteBytesExt};
use std::fmt;
use std::fmt::Formatter;
use crate::SIGNED_RESPONSE_CONTEXT;
///
/// Represents the delegated Roughtime ephemeral online key.
///
pub struct OnlineKey {
signer: Signer,
}
impl OnlineKey {
pub fn new() -> Self {
OnlineKey {
signer: Signer::new(),
}
}
/// Create a DELE message containing the public key of this online key
pub fn make_dele(&self) -> RtMessage {
let zeros = [0u8; 8];
let max = [0xff; 8];
let pub_key_bytes = self.signer.public_key_bytes();
let mut dele_msg = RtMessage::new(3);
dele_msg.add_field(Tag::PUBK, pub_key_bytes).unwrap();
dele_msg.add_field(Tag::MINT, &zeros).unwrap();
dele_msg.add_field(Tag::MAXT, &max).unwrap();
dele_msg
}
/// Create an SREP response containing the provided time and Merkle root,
/// signed by this online key.
pub fn make_srep(&mut self, now: Timespec, merkle_root: &[u8]) -> RtMessage {
let mut radi = [0; 4];
let mut midp = [0; 8];
// one second (in microseconds)
(&mut radi as &mut [u8])
.write_u32::<LittleEndian>(1_000_000)
.unwrap();
// current epoch time in microseconds
let midp_time = {
let secs = (now.sec as u64) * 1_000_000;
let nsecs = (now.nsec as u64) / 1_000;
secs + nsecs
};
(&mut midp as &mut [u8])
.write_u64::<LittleEndian>(midp_time)
.unwrap();
// Signed response SREP
let srep_bytes = {
let mut srep_msg = RtMessage::new(3);
srep_msg.add_field(Tag::RADI, &radi).unwrap();
srep_msg.add_field(Tag::MIDP, &midp).unwrap();
srep_msg.add_field(Tag::ROOT, merkle_root).unwrap();
srep_msg.encode().unwrap()
};
// signature on SREP
let srep_signature = {
self.signer.update(SIGNED_RESPONSE_CONTEXT.as_bytes());
self.signer.update(&srep_bytes);
self.signer.sign()
};
let mut result = RtMessage::new(2);
result.add_field(Tag::SIG, &srep_signature).unwrap();
result.add_field(Tag::SREP, &srep_bytes).unwrap();
result
}
}
impl fmt::Display for OnlineKey {
fn fmt(&self, f: &mut Formatter) -> fmt::Result {
write!(f, "{}", self.signer)
}
}
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