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If not, see . + +Also add information on how to contact you by electronic and paper mail. + + If the program does terminal interaction, make it output a short +notice like this when it starts in an interactive mode: + + Copyright (C) + This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. + This is free software, and you are welcome to redistribute it + under certain conditions; type `show c' for details. + +The hypothetical commands `show w' and `show c' should show the appropriate +parts of the General Public License. Of course, your program's commands +might be different; for a GUI interface, you would use an "about box". + + You should also get your employer (if you work as a programmer) or school, +if any, to sign a "copyright disclaimer" for the program, if necessary. +For more information on this, and how to apply and follow the GNU GPL, see +. + + The GNU General Public License does not permit incorporating your program +into proprietary programs. If your program is a subroutine library, you +may consider it more useful to permit linking proprietary applications with +the library. If this is what you want to do, use the GNU Lesser General +Public License instead of this License. But first, please read +. \ No newline at end of file diff --git a/README.md b/README.md new file mode 100644 index 0000000..8f7700b --- /dev/null +++ b/README.md @@ -0,0 +1,207 @@ + +# doby + +Secure symmetric encryption from the command line + +## Features + +* Fast: written in [rust](https://www.rust-lang.org), encrypts with [AES-256-CTR](https://en.wikipedia.org/wiki/Block_cipher_mode_of_operation#Counter_(CTR)) +* [HMAC](https://en.wikipedia.org/wiki/HMAC) ciphertext authentication +* Password brute-force resistance with [Argon2](https://en.wikipedia.org/wiki/Argon2) +* Encryption from STDIN/STDOUT or from files +* Adjustable performance & secuity parameters + +## Disclamer +doby is provided "as is", without any warranty of any kind. I'm not a professional cryptographer. This program didn't receive any security audit and therefore __shouldn't be considered fully secure__. + +## Usage + +Encryption + +```bash +doby my-super-secret-source-code.rs encrypted.doby +``` + +Decryption + +```bash +doby encrypted.doby decrypted.rs +``` + +If you ommit file path or use `-`, doby operates from `stdin/stdout` + +```bash +# Read from stdin and write to stdout +cat my-super-secret-music.flac | doby > encrypted.doby + +# Read from a file and output to stdout +doby encrypted.doby > decrypted.flac + +# Read from stdin and save to a file +cat my-super-secret-logs-file.log | doby - logs.doby +``` + +Speicfy password from the command line + +```bash +doby -p "A super very ultra strong passphrase" my-super-secret-document.pdf document.doby +``` + +Double encryption + +```bash +doby -p "first password" my-super-secret-database.db | doby -f - double-encrypted.doby +``` + +Increase password brute-force resistance + +```bash +echo "you-will-never-break-this" | doby --memory-cost 524288 --threads 16 --iterations 40 > my-super-secret-password.doby +``` + +## Full Options + +``` +USAGE: + doby [FLAGS] [OPTIONS] [ARGS] + +FLAGS: + -f, --force-encrypt Encrypt even if doby format is recognized + -h, --help Prints help information + -V, --version Prints version information + +OPTIONS: + -p, --password + -b, --block-size Size of file chunk (in bytes) [default: 65536] + -m, --memory-cost Argon2 memory cost (in kilobytes) [default: 4096] + -t, --threads Argon2 parallelism (between 1 and 255) [default: 4] + -i, --iterations Argon2 time cost [default: 10] + +ARGS: + | "-" or empty for stdin + | "-" or empty for stdout +``` + +## Build + +You should verify commits before building the binary. You can download my PGP key from keyservers: + +``` +gpg --keyserver hkp://pool.sks-keyservers.net --recv-keys 007F84120107191E +``` +Fingerprint: `BD56 2147 9E7B 74D3 6A40 5BE8 007F 8412 0107 191E` \ +Email: `Hardcore Sushi ` + +Once imported: + +```bash +git clone --depth=1 https://forge.chapril.org/hardcoresushi/doby.git +cd doby +git verify-commit HEAD +cargo build --release #outputs to ./target/release/doby +``` + +## Cryptographic details + +### Encryption + +doby first derives your password with Argon2 (version 19) in Argon2id mode with a 64 bytes long random salt. A `master_key` of 32 bytes is thus generated. + +```rust +let master_key: [u8; 32] = argon2id( + password, + random_password_salt, + argon2_time_cost, + argon2_memory_cost, + argon2_parallelism, +); +``` + +Then, doby uses [HKDF](https://en.wikipedia.org/wiki/HKDF) with a new random salt to compute the `encryption_key` and the `authentication_key`. + +```rust +let hkdf = Hkdf::new( + random_hkdf_salt, + master_key, //ikm + blake3, //hash function +); +let encryption_key: [u8; 32] = hkdf.expand(b"doby_encryption_key"); +let authentication_key: [u8; 32] = hkdf.expand(b"doby_authentication_key"); +``` + +Next, doby initializes a [BLAKE3](https://en.wikipedia.org/wiki/BLAKE_%28hash_function%29#BLAKE3) HMAC with `authentication_key` and add all public encryption parameters to it. + +```rust +let hmac = Hmac::new( + authentication_key, + blake3, //hash function +); +hmac.update(random_password_salt); +hmac.update(argon2_time_cost); +hmac.update(argon2_memory_cost); +hmac.update(argon2_parallelism); +hmac.update(random_hkdf_salt); +hmac.update(random_nonce); //16 bytes random nonce used in AES-CTR cipher +``` + +All this parameters are also written in plain text in the header of the doby output. + +Now, doby initializes an AES-CTR cipher with `encryption_key` and `random_nonce` and starts the actual encryption. It reads chunks from the plaintext (according to the `--block-size` parameter), encrypts them with the cipher and updates the HMAC with the ciphertext. + +```rust +let cipher = Aes256Ctr::new(encryption_key, random_nonce); +let mut n = 1; +let mut chunk: [u8; block_size] = [0; block_size]; +while n != 0 { + n = input.read(&mut chunk); //read plaintext + cipher.apply_keystream(&mut chunk[..n]); //encrypt + hmac.update(chunk[..n]); + output.write(chunk[..n]); //write ciphertext +} +``` + +Once the whole plaintext is encrypted, doby computes and appends the HMAC to the ciphertext. + +```rust +output.write(hmac.digest()); +``` + +### Decryption + +doby reads the public encryption values from the input header to get all parameters needed to re-derive the `master_key` from the password with Argon2. + +```rust +let master_key: [u8; 32] = argon2id( + password, + password_salt_read_from_input, + argon2_time_cost_read_from_input, + argon2_memory_cost_read_from_input, + argon2_parallelism_read_from_input, +); +``` + +`encryption_key` and `authentication_key` are computed from `master_key` and the HKDF salt in the same way as during encryption. The HMAC is also initialized and updated with the values read from the header. + +Then, doby starts decryption. + +```rust +let cipher = Aes256Ctr::new(encryption_key, nonce_read_from_input); +let mut n = 1; +let mut chunk: [u8; block_size] = [0; block_size]; +while n != 0 { + n = input.read(&mut chunk); //read ciphertext + hmac.update(chunk[..n]); + cipher.apply_keystream(&mut chunk[..n]); //decrypt + output.write(chunk[..n]); //write plaintext +} +``` + +Once the whole ciphertext is decrypted, doby computes and verifies the HMAC. + +```rust +hmac.digest() == last_32_bytes_read +``` + +If the verification success, the file is successfully decrypted and authenticated. + +_If you find any weakness or security issue is this protocol, please open an issue._ \ No newline at end of file diff --git a/src/bin/blocksize.rs b/src/bin/blocksize.rs new file mode 100644 index 0000000..d7515cc --- /dev/null +++ b/src/bin/blocksize.rs @@ -0,0 +1,84 @@ +use std::{ + io::{self, BufWriter, BufReader, Write, Seek, SeekFrom}, + time::Instant, + env, + fs::{File, OpenOptions} +}; +use doby::{ + encrypt, decrypt, + crypto::{ArgonParams, EncryptionParams, Cipher} +}; + +const MAX_BLOCK_SIZE: usize = 1_073_741_824; //1GB +const PASSWORD: &[u8] = b"HARDCORE music is the best music of all time"; + +fn set_if_better(best_time: &mut Option, time: u128, best_block_size: &mut Option, block_size: usize) { + let mut better = true; + if let Some(best_time) = best_time { + better = time < *best_time; + } + if better { + *best_time = Some(time); + *best_block_size = Some(block_size); + } +} + +fn reset(i: &mut I) -> io::Result { + i.seek(SeekFrom::Start(0)) +} + +fn main() -> io::Result<()> { + let args: Vec = env::args().collect(); + + let input = File::open(&args[1])?; + let output = OpenOptions::new().create(true).truncate(true).write(true).open(&args[2])?; + + let params = EncryptionParams::new(ArgonParams{ + t_cost: 1, + m_cost: 8, + parallelism: 1, + }); + + let mut best_encrypt_time = None; + let mut best_encrypt_block_size = None; + let mut best_decrypt_time = None; + let mut best_decrypt_block_size = None; + + let mut block_size = 1024; + while block_size <= MAX_BLOCK_SIZE { + let mut reader = BufReader::with_capacity(block_size, &input); + let mut writer = BufWriter::with_capacity(block_size, &output); + + let cipher = Cipher::new(PASSWORD, ¶ms).unwrap(); + let t_encrypt = Instant::now(); + encrypt(&mut reader, &mut writer, ¶ms, cipher, block_size, None)?; + writer.flush()?; + let encrypt_time = t_encrypt.elapsed().as_millis(); + println!("Encrypted in {}ms with block size of {}B", encrypt_time, block_size); + set_if_better(&mut best_encrypt_time, encrypt_time, &mut best_encrypt_block_size, block_size); + reset(&mut reader)?; + reset(&mut writer)?; + + let cipher = Cipher::new(PASSWORD, ¶ms).unwrap(); + let t_decrypt = Instant::now(); + decrypt(&mut reader, &mut writer, cipher, block_size)?; + writer.flush()?; + let decrypt_time = t_decrypt.elapsed().as_millis(); + println!("Decrypted in {}ms with block size of {}B", decrypt_time, block_size); + set_if_better(&mut best_decrypt_time, decrypt_time, &mut best_decrypt_block_size, block_size); + reset(&mut reader)?; + reset(&mut writer)?; + + block_size *= 2; + } + + println!(" + Best block size for encryption: {}B + Time: {}ms + + Best block size for decryption: {}B + Time: {}ms + ", best_encrypt_block_size.unwrap(), best_encrypt_time.unwrap(), best_decrypt_block_size.unwrap(), best_decrypt_time.unwrap()); + + Ok(()) +} \ No newline at end of file diff --git a/src/cli.rs b/src/cli.rs new file mode 100644 index 0000000..a7b3276 --- /dev/null +++ b/src/cli.rs @@ -0,0 +1,125 @@ +use std::{ + path::Path, + fs::File, + str::FromStr, + io::{stdin, stdout, Read, Write}, +}; +use clap::{crate_name, crate_version, App, Arg}; +use crate::crypto::ArgonParams; + +pub struct CliArgs { + pub password: String, + pub force_encrypt: bool, + pub argon2_params: ArgonParams, + pub block_size: usize, + pub reader: Box, + pub writer: Box, +} + +pub fn parse() -> Option { + let app = App::new(crate_name!()) + .version(crate_version!()) + .arg(Arg::with_name("INPUT").help(" | \"-\" or empty for stdin")) + .arg(Arg::with_name("OUTPUT").help(" | \"-\" or empty for stdout")) + .arg( + Arg::with_name("force-encrypt") + .short("f") + .long("force-encrypt") + .help(&format!("Encrypt even if {} format is recognized", crate_name!())) + ) + .arg( + Arg::with_name("password") + .short("p") + .long("password") + .value_name("password") + ) + .arg( + Arg::with_name("t_cost") + .short("i") + .long("iterations") + .value_name("iterations") + .help("Argon2 time cost") + .default_value("10") + ) + .arg( + Arg::with_name("m_cost") + .short("m") + .long("memory-cost") + .value_name("memory cost") + .help("Argon2 memory cost (in kilobytes)") + .default_value("4096") + ) + .arg( + Arg::with_name("parallelism") + .short("t") + .long("threads") + .value_name("threads") + .help("Argon2 parallelism (between 1 and 255)") + .default_value("4") + ) + .arg( + Arg::with_name("blocksize") + .short("b") + .long("block-size") + .help("Size of file chunk (in bytes)") + .default_value("65536") + ) + .get_matches(); + + let params = { + let t_cost = number(app.value_of("t_cost").unwrap())?; + let m_cost = number(app.value_of("m_cost").unwrap())?; + let parallelism = number(app.value_of("parallelism").unwrap())?; + + ArgonParams { + t_cost, + m_cost, + parallelism, + } + }; + + let block_size = number(app.value_of("blocksize").unwrap())?; + + let input = app + .value_of("INPUT") + .and_then(|s| if s == "-" { None } else { Some(s) }) + .map(|s| Box::new(File::open(s).unwrap()) as Box) + .unwrap_or_else(|| Box::new(stdin())); + + let output = app + .value_of("OUTPUT") + .and_then(|s| if s == "-" { None } else { Some(s) }) + .map(|s| { + if Path::new(s).exists() { + eprintln!("{} already exists", s); + None + } else { + Some(Box::new(File::create(s).unwrap()) as Box) + } + }) + .unwrap_or_else(|| Some(Box::new(stdout()))); + + let password = match app.value_of("password") { + Some(s) => s.to_string(), + None => rpassword::read_password_from_tty(Some("Password: ")).unwrap(), + }; + + Some(CliArgs { + password, + force_encrypt: app.is_present("force-encrypt"), + argon2_params: params, + block_size, + reader: input, + writer: output?, + }) +} + +fn number(val: &str) -> Option { + match val.parse::() { + Ok(n) => Some(n), + Err(_) => { + eprintln!("Cannot parse '{}' to '{}'", val, std::any::type_name::()); + None + } + } +} diff --git a/src/crypto.rs b/src/crypto.rs new file mode 100644 index 0000000..c68189b --- /dev/null +++ b/src/crypto.rs @@ -0,0 +1,146 @@ +use std::io::{self, Read, Write}; +use aes::{Aes256Ctr, cipher::{NewCipher, StreamCipher}}; +use hmac::{Hmac, Mac, NewMac}; +use rand::{Rng, rngs::OsRng}; +use argon2::{Argon2, Version, Algorithm}; +use hkdf::Hkdf; +use zeroize::Zeroize; + +const SALT_LEN: usize = 64; +const NONCE_LEN: usize = 16; +const HASH_LEN: usize = 32; +const KEY_LEN: usize = HASH_LEN; + +pub struct ArgonParams { + pub t_cost: u32, + pub m_cost: u32, + pub parallelism: u8, +} + +pub struct EncryptionParams { + password_salt: [u8; SALT_LEN], + argon2: ArgonParams, + hkdf_salt: [u8; SALT_LEN], + nonce: [u8; NONCE_LEN], +} + +impl EncryptionParams { + const PARAMS_LEN: usize = SALT_LEN*2 + 4*2 + 1 + NONCE_LEN; + + pub fn new(argon2_params: ArgonParams) -> EncryptionParams { + let mut password_salt = [0; SALT_LEN]; + OsRng.fill(&mut password_salt); + let mut hkdf_salt = [0; SALT_LEN]; + OsRng.fill(&mut hkdf_salt); + let mut nonce = [0; NONCE_LEN]; + OsRng.fill(&mut nonce); + EncryptionParams { + password_salt, + argon2: argon2_params, + hkdf_salt, + nonce, + } + } + pub fn write(&self, writer: &mut W) -> io::Result<()> { + writer.write_all(&self.password_salt)?; + writer.write_all(&self.argon2.t_cost.to_be_bytes())?; + writer.write_all(&self.argon2.m_cost.to_be_bytes())?; + writer.write_all(&self.argon2.parallelism.to_be_bytes())?; + writer.write_all(&self.hkdf_salt)?; + writer.write_all(&self.nonce)?; + Ok(()) + } + pub fn read(reader: &mut R) -> io::Result { + let mut password_salt = [0; SALT_LEN]; + reader.read_exact(&mut password_salt)?; + let mut t_cost_buf = [0; 4]; + reader.read_exact(&mut t_cost_buf)?; + let mut m_cost_buf = [0; 4]; + reader.read_exact(&mut m_cost_buf)?; + let mut parallelism_buf = [0; 1]; + reader.read_exact(&mut parallelism_buf)?; + let mut hkdf_salt = [0; SALT_LEN]; + reader.read_exact(&mut hkdf_salt)?; + let mut nonce = [0; NONCE_LEN]; + reader.read_exact(&mut nonce)?; + + let argon2_params = ArgonParams { + t_cost: u32::from_be_bytes(t_cost_buf), + m_cost: u32::from_be_bytes(m_cost_buf), + parallelism: u8::from_be_bytes(parallelism_buf), + }; + + Ok(EncryptionParams { + password_salt, + argon2: argon2_params, + hkdf_salt, + nonce, + }) + } +} + +pub struct Cipher { + cipher: Aes256Ctr, + hmac: Hmac, + buffer: Vec, +} + +impl Cipher { + pub fn new(password: &[u8], params: &EncryptionParams) -> Result { + + let argon = Argon2::new(None, params.argon2.t_cost, params.argon2.m_cost, params.argon2.parallelism.into(), Version::V0x13)?; + let mut master_key = [0; KEY_LEN]; + argon.hash_password_into(Algorithm::Argon2id, password, ¶ms.password_salt, &[], &mut master_key)?; + + let hkdf = Hkdf::::new(Some(¶ms.hkdf_salt), &master_key); + let mut encryption_key = [0; KEY_LEN]; + hkdf.expand(b"doby_encryption_key", &mut encryption_key).unwrap(); + let mut authentication_key = [0; KEY_LEN]; + hkdf.expand(b"doby_authentication_key", &mut authentication_key).unwrap(); + master_key.zeroize(); + + let mut encoded_params = Vec::with_capacity(EncryptionParams::PARAMS_LEN); + params.write(&mut encoded_params).unwrap(); + let mut hmac = Hmac::new_from_slice(&authentication_key).unwrap(); + hmac.update(&encoded_params); + + Ok(Cipher { + cipher: Aes256Ctr::new_from_slices(&encryption_key, ¶ms.nonce).unwrap(), + hmac, + buffer: Vec::new(), + }) + } + + pub fn encrypt_chunk(&mut self, buff: &mut [u8], writer: &mut W) -> io::Result<()> { + self.cipher.apply_keystream(buff); + self.hmac.update(buff); + writer.write_all(buff) + } + + pub fn write_hmac(self, writer: &mut W) -> io::Result { + let tag = self.hmac.finalize().into_bytes(); + writer.write(&tag) + } + + pub fn decrypt_chunk(&mut self, reader: &mut R, buff: &mut [u8]) -> io::Result { + let buffer_len = self.buffer.len(); + buff[..buffer_len].clone_from_slice(&self.buffer); + let read = reader.read(&mut buff[buffer_len..])?; + + self.buffer.clear(); + let n = if buffer_len + read >= HASH_LEN { + buffer_len + read - HASH_LEN + } else { + 0 + }; + self.buffer.extend_from_slice(&buff[n..buffer_len+read]); + + self.hmac.update(&buff[..n]); + self.cipher.apply_keystream(&mut buff[..n]); + Ok(n) + } + + pub fn verify_hmac(self) -> bool { + self.hmac.verify(&self.buffer).is_ok() + } +} \ No newline at end of file diff --git a/src/lib.rs b/src/lib.rs new file mode 100644 index 0000000..b3087b3 --- /dev/null +++ b/src/lib.rs @@ -0,0 +1,44 @@ +pub mod cli; +pub mod crypto; + +use std::io::{self, Read, Write}; +use crypto::{Cipher, EncryptionParams}; + +pub const MAGIC_BYTES: &[u8; 4] = b"DOBY"; + +pub fn encrypt(reader: &mut R, writer: &mut W, params: &EncryptionParams, mut cipher: Cipher, block_size: usize, already_read: Option>) -> io::Result<()> { + writer.write_all(MAGIC_BYTES)?; + params.write(writer)?; + let mut buff = vec![0; block_size]; + let mut n = 1; + if let Some(already_read) = already_read { + buff[..already_read.len()].clone_from_slice(&already_read); + n = reader.read(&mut buff[already_read.len()..])?; + cipher.encrypt_chunk(&mut buff[..n+already_read.len()], writer)?; + } + if n > 0 { + loop { + n = reader.read(&mut buff)?; + if n == 0 { + break; + } else { + cipher.encrypt_chunk(&mut buff[..n], writer)?; + } + } + cipher.write_hmac(writer)?; + } + Ok(()) +} + +pub fn decrypt(reader: &mut R, writer: &mut W, mut cipher: Cipher, block_size: usize) -> io::Result { + let mut buff = vec![0; block_size]; + loop { + let n = cipher.decrypt_chunk(reader, &mut buff)?; + if n == 0 { + break; + } else { + writer.write(&buff[..n])?; + } + } + Ok(cipher.verify_hmac()) +} \ No newline at end of file diff --git a/src/main.rs b/src/main.rs new file mode 100644 index 0000000..3dffe10 --- /dev/null +++ b/src/main.rs @@ -0,0 +1,64 @@ +use std::io::{BufWriter, BufReader, Read}; +use zeroize::Zeroize; +use doby::{ + cli, + crypto::{EncryptionParams, Cipher}, + MAGIC_BYTES, + decrypt, + encrypt, +}; + +fn main() { + if let Some(mut cli_args) = cli::parse() { + let mut reader = BufReader::with_capacity(cli_args.block_size, cli_args.reader); + let mut writer = BufWriter::with_capacity(cli_args.block_size, cli_args.writer); + + let mut magic_bytes = vec![0; MAGIC_BYTES.len()]; + match reader.read(&mut magic_bytes) { + Ok(n) => { + if n < magic_bytes.len() { + magic_bytes.truncate(n); + } + if magic_bytes == MAGIC_BYTES && !cli_args.force_encrypt { //we probably want to decrypt + match EncryptionParams::read(&mut reader) { + Ok(params) => { + match Cipher::new(cli_args.password.as_bytes(), ¶ms) { + Ok(cipher) => { + match decrypt(&mut reader, &mut writer, cipher, cli_args.block_size) { + Ok(verified) => { + if !verified { + eprintln!("WARNING: HMAC verification failed !\nEither your password is incorrect or the file has been corrupted.\nOpen with caution, it could have been infected by an attacker."); + } + } + Err(e) => eprintln!("I/O error while decrypting: {}", e) + } + } + Err(e) => eprintln!("Invalid argon2 params: {}", e) + } + } + Err(e) => eprintln!("I/O error while reading headers: {}", e) + } + } else { //otherwise, encrypt + let params = EncryptionParams::new(cli_args.argon2_params); + match Cipher::new(cli_args.password.as_bytes(), ¶ms) { + Ok(cipher) => { + if let Err(e) = encrypt( + &mut reader, + &mut writer, + ¶ms, + cipher, + cli_args.block_size, + Some(magic_bytes) + ) { + eprintln!("I/O error while encrypting: {}", e); + } + } + Err(e) => eprintln!("Invalid argon2 params: {}", e) + } + } + } + Err(e) => eprintln!("I/O error while reading magic bytes: {}", e), + } + cli_args.password.zeroize(); + } +}