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/// Asymmetrically encrypts OpenPGP messages using the openpgp crate,
/// Sequoia's low-level API.
use std::env;
use std::io;
extern crate sequoia_openpgp as openpgp;
use crate::openpgp::armor;
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() {
let p = &P::new();
let args: Vec<String> = env::args().collect();
if args.len() < 3 {
panic!("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::default().set_storage_encryption(true),
"for-transport" => KeyFlags::default().set_transport_encryption(true),
x => panic!("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)
.expect("Failed to read key")
}).collect();
let recipients =
certs.iter()
.flat_map(|cert| {
cert.keys()
.with_policy(p, None).alive().revoked(false).key_flags(&mode)
});
// Compose a writer stack corresponding to the output format and
// packet structure we want. First, we want the output to be
// ASCII armored.
let mut sink = armor::Writer::new(io::stdout(), armor::Kind::Message)
.expect("Failed to create an armored writer");
// Stream an OpenPGP message.
let message = Message::new(&mut sink);
// We want to encrypt a literal data packet.
let encryptor = Encryptor::for_recipients(message, recipients)
.build().expect("Failed to create encryptor");
let mut literal_writer = LiteralWriter::new(encryptor).build()
.expect("Failed to create literal writer");
// Copy stdin to our writer stack to encrypt the data.
io::copy(&mut io::stdin(), &mut literal_writer)
.expect("Failed to encrypt");
// Finally, finalize the OpenPGP message by tearing down the
// writer stack.
literal_writer.finalize().unwrap();
// Finalize the armor writer.
sink.finalize()
.expect("Failed to write data");
}
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