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/// Asymmetrically encrypts OpenPGP messages 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::serialize::stream::Armorer;
use crate::openpgp::types::KeyFlags;
use crate::openpgp::parse::Parse;
use crate::openpgp::serialize::stream::{
Message, LiteralWriter, Encryptor,
};
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() < 3 {
return Err(anyhow::anyhow!("A simple encryption filter.\n\n\
Usage: {} [at-rest|for-transport] <keyfile> [<keyfile>...] \
<input >output\n", args[0]));
}
let mode = match args[1].as_ref() {
"at-rest" => KeyFlags::empty().set_storage_encryption(),
"for-transport" => KeyFlags::empty().set_transport_encryption(),
x => return Err(anyhow::anyhow!("invalid mode: {:?}, \
must be either 'at-rest' or 'for-transport'",
x)),
};
// Read the certificates from the given files.
let certs: Vec<openpgp::Cert> = args[2..].iter().map(|f| {
openpgp::Cert::from_file(f)
}).collect::<openpgp::Result<Vec<_>>>()
.context("Failed to read key")?;
// Build a list of recipient subkeys.
let mut recipients = Vec::new();
for cert in certs.iter() {
// Make sure we add at least one subkey from every
// certificate.
let mut found_one = false;
for key in cert.keys().with_policy(p, None)
.supported().alive().revoked(false).key_flags(&mode)
{
recipients.push(key);
found_one = true;
}
if ! found_one {
return Err(anyhow::anyhow!("No suitable encryption subkey for {}",
cert));
}
}
// 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()?;
// We want to encrypt a literal data packet.
let message = Encryptor::for_recipients(message, recipients)
.build().context("Failed to create encryptor")?;
let mut message = LiteralWriter::new(message).build()
.context("Failed to create literal writer")?;
// Copy stdin to our writer stack to encrypt the data.
io::copy(&mut io::stdin(), &mut message)
.context("Failed to encrypt")?;
// Finally, finalize the OpenPGP message by tearing down the
// writer stack.
message.finalize()?;
Ok(())
}
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