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/// This program demonstrates how to encrypt a stream of data.
use std::env;
use std::io;
extern crate openpgp;
use openpgp::armor;
use openpgp::serialize::stream::{
wrap, 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_reader(
// Use an openpgp::Reader so that we accept both armored
// and plain PGP data.
openpgp::Reader::from_file(f)
.expect("Failed to open file"))
.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 as
// armored.
let sink = armor::Writer::new(io::stdout(), armor::Kind::Message);
// We want to encrypt a literal data packet.
let encryptor = Encryptor::new(wrap(sink),
&[], // No symmetric encryption.
&recipients,
mode)
.expect("Failed to create encryptor");
let mut literal_writer = LiteralWriter::new(encryptor, 't', None, None)
.expect("Failed to create literal writer");
// Finally, copy stdin to our writer stack to encrypt the data.
io::copy(&mut io::stdin(), &mut literal_writer)
.expect("Failed to encrypt");
}
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