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|
/// Notarizes OpenPGP messages using the openpgp crate, Sequoia's
/// low-level API.
use std::env;
use std::io;
extern crate sequoia_openpgp as openpgp;
use openpgp::{
armor,
crypto,
Packet,
constants::DataFormat,
packet::key::SecretKey,
parse::{Parse, PacketParserResult},
serialize::Serialize,
};
use openpgp::serialize::stream::{Message, LiteralWriter, Signer};
fn main() {
let args: Vec<String> = env::args().collect();
if args.len() < 2 {
panic!("A simple notarizing filter.\n\n\
Usage: {} <secret-keyfile> [<secret-keyfile>...] \
<input >output\n", args[0]);
}
// Read the transferable secret keys from the given files.
let mut keys = Vec::new();
'nextfile: for filename in &args[1..] {
let tsk = openpgp::TPK::from_file(filename)
.expect("Failed to read key");
for key in tsk.keys_valid().signing_capable().map(|k| k.2) {
if let Some(mut secret) = key.secret() {
let secret_mpis = match secret {
SecretKey::Encrypted { .. } => {
let password = rpassword::read_password_from_tty(
Some(&format!("Please enter password to decrypt \
{}/{}: ",tsk, key))).unwrap();
secret.decrypt(key.pk_algo(), &password.into())
.expect("decryption failed")
},
SecretKey::Unencrypted { ref mpis } =>
mpis.clone(),
};
keys.push(crypto::KeyPair::new(key.clone(), secret_mpis)
.unwrap());
break 'nextfile;
}
}
panic!("Found no suitable signing key on {}", tsk);
}
// Compose a writer stack corresponding to the output format and
// packet structure we want. First, we want the output to be
// ASCII armored.
let sink = armor::Writer::new(io::stdout(), armor::Kind::Message, &[])
.expect("Failed to create an armored writer.");
// Stream an OpenPGP message.
let message = Message::new(sink);
// Now, create a signer that emits a detached signature.
let mut signer = Signer::new(
message,
keys.iter_mut().map(|s| -> &mut dyn crypto::Signer { s }).collect(),
None)
.expect("Failed to create signer");
// Create a parser for the message to be notarized.
let mut input = io::stdin();
let mut ppr
= openpgp::parse::PacketParser::from_reader(&mut input)
.expect("Failed to build parser");
while let PacketParserResult::Some(mut pp) = ppr {
if ! pp.possible_message() {
panic!("Malformed OpenPGP message");
}
match pp.packet {
Packet::PKESK(_) | Packet::SKESK(_) =>
panic!("Encrypted messages are not supported"),
Packet::OnePassSig(ref ops) =>
ops.serialize(&mut signer).expect("Failed to serialize"),
Packet::Literal(_) => {
// Then, create a literal writer to wrap the data in a
// literal message packet.
let mut literal =
LiteralWriter::new(signer, DataFormat::Binary, None, None)
.expect("Failed to create literal writer");
// Copy all the data.
io::copy(&mut pp, &mut literal)
.expect("Failed to sign data");
signer = literal.finalize_one()
.expect("Failed to sign data")
.unwrap();
},
Packet::Signature(ref sig) =>
sig.serialize(&mut signer).expect("Failed to serialize"),
_ => (),
}
ppr = pp.recurse().expect("Failed to recurse").1;
}
if let PacketParserResult::EOF(eof) = ppr {
if ! eof.is_message() {
panic!("Malformed OpenPGP message")
}
} else {
unreachable!()
}
// Finally, teardown the stack to ensure all the data is written.
signer.finalize()
.expect("Failed to write data");
}
|
