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/* PSPP - a program for statistical analysis.
* Copyright (C) 2023 Free Software Foundation, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>. */
use anyhow::{Result, anyhow};
use clap::Args;
use pspp::crypto::EncryptedFile;
use std::{fs::File, path::PathBuf};
use zeroize::Zeroizing;
/// Decrypts an encrypted SPSS data, output, or syntax file.
#[derive(Args, Clone, Debug)]
pub struct Decrypt {
/// Input file name.
input: PathBuf,
/// Output file name.
output: PathBuf,
/// Password for decryption, with or without what SPSS calls "password encryption".
///
/// If omitted, PSPP will prompt interactively for the password.
#[clap(short, long)]
password: Option<String>,
}
impl Decrypt {
pub fn run(self) -> Result<()> {
let input = EncryptedFile::new(File::open(&self.input)?)?;
let password = match self.password {
Some(password) => Zeroizing::new(password),
None => {
eprintln!("Please enter the password for {}:", self.input.display());
readpass::from_tty().unwrap()
}
};
let mut reader = match input.unlock(password.as_bytes()) {
Ok(reader) => reader,
Err(_) => return Err(anyhow!("Incorrect password.")),
};
let mut writer = File::create(self.output)?;
std::io::copy(&mut reader, &mut writer)?;
Ok(())
}
}