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/// Signs data using the openpgp crate and secrets in gpg-agent.
use std::io;
use sequoia_openpgp as openpgp;
use sequoia_ipc as ipc;
use openpgp::parse::Parse;
use openpgp::serialize::stream::{Armorer, Message, LiteralWriter, Signer};
use openpgp::policy::StandardPolicy as P;
use ipc::gnupg::{Context, KeyPair};
fn main() -> openpgp::Result<()> {
let p = &P::new();
let matches = clap::App::new("gpg-agent-sign")
.version(env!("CARGO_PKG_VERSION"))
.about("Connects to gpg-agent and creates a dummy signature.")
.arg(clap::Arg::with_name("homedir").value_name("PATH")
.long("homedir")
.help("Use this GnuPG home directory, default: $GNUPGHOME"))
.arg(clap::Arg::with_name("cert").value_name("Cert")
.required(true)
.multiple(true)
.help("Public part of the secret keys managed by gpg-agent"))
.get_matches();
let ctx = if let Some(homedir) = matches.value_of("homedir") {
Context::with_homedir(homedir)?
} else {
Context::new()?
};
// Read the Certs from the given files.
let certs =
matches.values_of("cert").expect("required").map(
openpgp::Cert::from_file
).collect::<Result<Vec<_>, _>>()?;
// Construct a KeyPair for every signing-capable (sub)key.
let mut signers = certs.iter().flat_map(|cert| {
cert.keys().with_policy(p, None).alive().revoked(false).for_signing()
.filter_map(|ka| {
KeyPair::new(&ctx, ka.key()).ok()
})
}).collect::<Vec<KeyPair>>();
// Compose a writer stack corresponding to the output format and
// packet structure we want.
// Stream an OpenPGP message.
let message = Message::new(io::stdout());
// We want the output to be ASCII armored.
let message = Armorer::new(message).build()?;
// Now, create a signer that emits the signature(s).
let mut signer =
Signer::new(message, signers.pop().expect("No key for signing"));
for s in signers {
signer = signer.add_signer(s);
}
let signer = signer.build()?;
// Then, create a literal writer to wrap the data in a literal
// message packet.
let mut literal = LiteralWriter::new(signer).build()?;
// Copy all the data.
io::copy(&mut io::stdin(), &mut literal)?;
// Finally, teardown the stack to ensure all the data is written.
literal.finalize()?;
Ok(())
}
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