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/// This program demonstrates how to make a detached signature.
use std::env;
use std::io;
extern crate rpassword;
extern crate sequoia_openpgp as openpgp;
use openpgp::armor;
use openpgp::crypto;
use openpgp::packet::key::SecretKey;
use openpgp::parse::Parse;
use openpgp::serialize::stream::{Message, Signer};
fn main() {
let args: Vec<String> = env::args().collect();
if args.len() < 2 {
panic!("A simple filter creating a detached signature.\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();
'nextfile: for filename in &args[1..] {
let tsk = openpgp::TPK::from_file(filename)
.expect("Failed to read key");
for key in tsk.select_signing_keys(None) {
if let Some(mut secret) = key.secret() {
let secret_mpis = match secret {
SecretKey::Encrypted { .. } => {
let password = rpassword::prompt_password_stderr(
&format!("Please enter password to decrypt {}/{}: ",
tsk, key)).unwrap();
secret.decrypt(key.pk_algo(), &password.into())
.expect("decryption failed")
},
SecretKey::Unencrypted { ref mpis } =>
mpis.clone(),
};
keys.push(crypto::KeyPair::new(key.clone(), secret_mpis)
.unwrap());
break 'nextfile;
}
}
panic!("Found no suitable signing key on {}", tsk);
}
// 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::Signature, &[])
.expect("Failed to create armored writer.");
// Stream an OpenPGP message.
let message = Message::new(sink);
// Now, create a signer that emits a detached signature.
let mut signer = Signer::detached(
message,
keys.iter_mut().map(|s| -> &mut dyn crypto::Signer { s }).collect())
.expect("Failed to create signer");
// Copy all the data.
io::copy(&mut io::stdin(), &mut signer)
.expect("Failed to sign data");
// Finally, teardown the stack to ensure all the data is written.
signer.finalize()
.expect("Failed to write data");
}
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