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|
use gpgme;
use structopt;
use gpgme::{Context, Protocol};
use std::{
error::Error,
fs::File,
io::{self, prelude::*},
path::PathBuf,
};
use structopt::StructOpt;
#[derive(Debug, StructOpt)]
struct Cli {
#[structopt(long)]
/// Use the CMS protocol
cms: bool,
#[structopt(long)]
#[structopt(long, conflicts_with = "normal")]
/// Create a detached signature
detach: bool,
#[structopt(long, conflicts_with = "normal", conflicts_with = "detach")]
/// Create a clear text signature
clear: bool,
#[structopt(long)]
/// Key to use for signing. Default key is used otherwise
key: Option<String>,
#[structopt(parse(from_os_str))]
/// File to sign
filename: PathBuf,
}
fn main() -> Result<(), Box<dyn Error>> {
let args = Cli::from_args();
let proto = if args.cms {
Protocol::Cms
} else {
Protocol::OpenPgp
};
let mode = if args.detach {
gpgme::SignMode::Detached
} else if args.clear {
gpgme::SignMode::Clear
} else {
gpgme::SignMode::Normal
};
let mut ctx = Context::from_protocol(proto)?;
ctx.set_armor(true);
if let Some(key) = args.key {
let key = ctx
.get_secret_key(key)
.map_err(|e| format!("unable to find signing key: {:?}", e))?;
ctx.add_signer(&key)
.map_err(|e| format!("add_signer() failed: {:?}", e))?;
}
let filename = &args.filename;
let mut input = File::open(filename)
.map_err(|e| format!("can't open file `{}': {:?}", filename.display(), e))?;
let mut output = Vec::new();
let result = ctx
.sign(mode, &mut input, &mut output)
.map_err(|e| format!("signing failed {:?}", e))?;
print_result(&result);
println!("Begin Output:");
io::stdout().write_all(&output)?;
println!("End Output.");
Ok(())
}
fn print_result(result: &gpgme::SigningResult) {
for sig in result.new_signatures() {
println!("Key fingerprint: {}", sig.fingerprint().unwrap_or("[none]"));
println!("Signature type : {:?}", sig.mode());
println!("Public key algo: {}", sig.key_algorithm());
println!("Hash algo .....: {}", sig.hash_algorithm());
println!("Creation time .: {:?}", sig.creation_time());
}
}
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