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|
use super::openpgp;
use super::openpgp::Packet;
/// This represents a transferable public key (see [RFC 4880, section
/// 11.1](https://tools.ietf.org/html/rfc4880#section-11.1)).
#[derive(Debug)]
pub struct TPK {
userids: Vec<UserIDBinding>,
subkeys: Vec<SubkeyBinding>,
}
#[derive(Debug)]
pub struct SubkeyBinding {
subkey: openpgp::Key,
signatures: Vec<openpgp::Signature>,
}
#[derive(Debug)]
pub struct UserIDBinding {
userid: openpgp::UserID,
signatures: Vec<openpgp::Signature>,
}
#[derive(Debug)]
enum States {
Start,
TPK,
UserID(UserIDBinding),
Subkey(SubkeyBinding),
End,
}
impl TPK {
/// Return the first transferable public key found in `m`.
pub fn from_message(m: openpgp::Message) -> Option<Self> {
let mut state = States::Start;
let mut tpk = TPK { userids: vec![], subkeys: vec![] };
for p in m.into_iter() {
state = match state {
States::Start => {
/* Find the first public key packet. */
match p {
Packet::PublicKey(pk) => {
tpk.subkeys.push(SubkeyBinding{subkey: pk, signatures: vec![]});
States::TPK
},
_ => States::Start,
}
},
States::TPK => {
/* Find user id, or subkey packets. */
match p {
Packet::PublicKey(_pk) => {
States::End
},
Packet::UserID(uid) => {
States::UserID(UserIDBinding{userid: uid, signatures: vec![]})
},
Packet::PublicSubkey(key) => {
States::Subkey(SubkeyBinding{subkey: key, signatures: vec![]})
},
_ => States::TPK,
}
},
States::UserID(mut u) => {
/* Find signature packets. */
match p {
Packet::PublicKey(_pk) => {
States::End
},
Packet::UserID(uid) => {
tpk.userids.push(u);
States::UserID(UserIDBinding{userid: uid, signatures: vec![]})
},
Packet::PublicSubkey(key) => {
tpk.userids.push(u);
States::Subkey(SubkeyBinding{subkey: key, signatures: vec![]})
},
Packet::Signature(sig) => {
u.signatures.push(sig);
States::UserID(u)
},
_ => States::UserID(u),
}
},
States::Subkey(mut s) => {
/* Find signature packets. */
match p {
Packet::PublicKey(_pk) => {
States::End
},
Packet::UserID(uid) => {
tpk.subkeys.push(s);
States::UserID(UserIDBinding{userid: uid, signatures: vec![]})
},
Packet::PublicSubkey(key) => {
tpk.subkeys.push(s);
States::Subkey(SubkeyBinding{subkey: key, signatures: vec![]})
},
Packet::Signature(sig) => {
s.signatures.push(sig);
States::Subkey(s)
},
_ => States::Subkey(s),
}
},
States::End => break,
};
}
match state {
States::UserID(u) => {
tpk.userids.push(u);
Some(tpk)
},
States::Subkey(s) => {
tpk.subkeys.push(s);
Some(tpk)
},
States::End => Some(tpk),
_ => None,
}.and_then(|tpk| tpk.canonicalize())
}
fn canonicalize(self) -> Option<Self> {
// Sanity checks.
// - One or more User ID packets.
if self.userids.len() == 0 {
return None;
}
// - After each Subkey packet, one Signature packet.
for subkey in self.subkeys.iter().skip(1) {
if subkey.signatures.len() == 0 {
return None;
}
}
// XXX Do some canonicalization.
Some(self)
}
}
#[cfg(test)]
mod test {
use super::TPK;
use super::openpgp;
macro_rules! bytes {
( $x:expr ) => { include_bytes!(concat!("../tests/data/keys/", $x)) };
}
#[test]
fn broken() {
let m = openpgp::Message::from_bytes(bytes!("testy-broken-no-pk.pgp")).unwrap();
let tpk = TPK::from_message(m);
assert!(tpk.is_none());
let m = openpgp::Message::from_bytes(bytes!("testy-broken-no-uid.pgp")).unwrap();
let tpk = TPK::from_message(m);
assert!(tpk.is_none());
let m = openpgp::Message::from_bytes(bytes!("testy-broken-no-sig-on-subkey.pgp")).unwrap();
let tpk = TPK::from_message(m);
assert!(tpk.is_none());
}
#[test]
fn basics() {
let m = openpgp::Message::from_bytes(bytes!("testy.pgp")).unwrap();
let tpk = TPK::from_message(m).unwrap();
//println!("{:?}", tpk);
assert_eq!(tpk.userids.len(), 1, "number of userids");
// XXX .value is private
//assert_eq!(tpk.userids[0].userid.value, "Testy McTestface <testy@example.org>");
assert_eq!(tpk.subkeys.len(), 2, "number of subkeys");
let m = openpgp::Message::from_bytes(bytes!("testy-no-subkey.pgp")).unwrap();
let tpk = TPK::from_message(m).unwrap();
assert_eq!(tpk.userids.len(), 1, "number of userids");
assert_eq!(tpk.subkeys.len(), 1, "number of subkeys");
}
}
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