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/// Signs data using the openpgp crate, Sequoia's low-level API.
use std::env;
use std::io;
use anyhow::Context;
use sequoia_openpgp as openpgp;
use crate::openpgp::parse::Parse;
use crate::openpgp::serialize::stream::{Armorer, Message, LiteralWriter, Signer};
use crate::openpgp::policy::StandardPolicy as P;
fn main() -> openpgp::Result<()> {
let p = &P::new();
let args: Vec<String> = env::args().collect();
if args.len() < 2 {
return Err(anyhow::anyhow!("A simple signing 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();
for filename in &args[1..] {
let tsk = openpgp::Cert::from_file(filename)
.context("Failed to read key")?;
let mut n = 0;
for skb in tsk.keys()
.with_policy(p, None).alive().revoked(false).for_signing().secret()
{
keys.push({
let mut key = skb.key().clone();
if key.secret().is_encrypted() {
let password = rpassword::prompt_password(format!(
"Please enter password to decrypt {}/{}: ",
tsk, key
))?;
key.secret_mut()
.decrypt_in_place(skb.key(), &password.into())
.context("decryption failed")?;
}
n += 1;
key.into_keypair()?
});
}
if n == 0 {
return Err(anyhow::anyhow!("Found no suitable signing key on {}", tsk));
}
}
// Compose a writer stack corresponding to the output format and
// packet structure we want.
let mut sink = io::stdout();
// Stream an OpenPGP message.
let message = Message::new(&mut sink);
let message = Armorer::new(message).build()?;
// Now, create a signer that emits the signature(s).
let mut signer =
Signer::new(message, keys.pop().context("No key for signing")?)?;
for s in keys {
signer = signer.add_signer(s)?;
}
let message = signer.build().context("Failed to create signer")?;
// Then, create a literal writer to wrap the data in a literal
// message packet.
let mut message = LiteralWriter::new(message).build()
.context("Failed to create literal writer")?;
// Copy all the data.
io::copy(&mut io::stdin(), &mut message)
.context("Failed to sign data")?;
// Finally, teardown the stack to ensure all the data is written.
message.finalize()
.context("Failed to write data")?;
Ok(())
}
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