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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::constants::DataFormat;
use crate::openpgp::parse::Parse;
use crate::openpgp::serialize::stream::{
Message, LiteralWriter, Encryptor, EncryptionMode,
};
fn main() {
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" => EncryptionMode::AtRest,
"for-transport" => EncryptionMode::ForTransport,
x => panic!("invalid mode: {:?}, \
must be either 'at-rest' or 'for-transport'",
x),
};
// Read the transferable public keys from the given files.
let tpks: Vec<openpgp::TPK> = args[2..].iter().map(|f| {
openpgp::TPK::from_file(f)
.expect("Failed to read key")
}).collect();
// Build a vector of references to hand to Encryptor.
let recipients: Vec<&openpgp::TPK> = tpks.iter().collect();
// 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);
// We want to encrypt a literal data packet.
let encryptor = Encryptor::new(message,
&[], // No symmetric encryption.
&recipients,
mode,
None, None)
.expect("Failed to create encryptor");
let mut literal_writer = LiteralWriter::new(encryptor, DataFormat::Binary,
None, None)
.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();
}
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