├── .cargo
└── config.toml
├── .github
└── workflows
│ └── build.yml
├── .gitignore
├── Cargo.lock
├── Cargo.toml
├── LICENSE
├── README.md
└── src
├── bin
└── file-encryptor.rs
├── command
├── keygen.rs
├── mod.rs
├── open.rs
└── seal.rs
├── crypto
├── block.rs
├── cipher.rs
├── mod.rs
└── pkcs7.rs
├── error.rs
├── ioutils.rs
└── lib.rs
/.cargo/config.toml:
--------------------------------------------------------------------------------
1 | [alias]
2 | seal = "run --bin file-encryptor -- seal -k test-output-key -i test-input.txt -o test-output.ciphertext"
3 | open = "run --bin file-encryptor -- open -k test-output-key -i test-output.ciphertext -o test-output.plaintext"
4 | lint = "clippy --all-features --all-targets"
5 |
--------------------------------------------------------------------------------
/.github/workflows/build.yml:
--------------------------------------------------------------------------------
1 | on: [push]
2 |
3 | name: Lint, Test, Build
4 |
5 | # Make sure CI fails on all warnings, including Clippy lints
6 | env:
7 | RUSTFLAGS: "-Dwarnings"
8 |
9 | jobs:
10 | build:
11 | name: Build binary in release
12 | runs-on: ubuntu-latest
13 | steps:
14 | - uses: actions/checkout@v2
15 | - uses: actions-rs/toolchain@v1
16 | with:
17 | toolchain: nightly
18 | - name: Lint
19 | run: cargo clippy --all-targets --all-features
20 | - name: Test
21 | run: cargo test --release
22 | - name: Build
23 | run: cargo build --release --all-features
24 |
--------------------------------------------------------------------------------
/.gitignore:
--------------------------------------------------------------------------------
1 | /target
2 | /test-input*
3 | /test-output*
4 |
5 |
6 | # Added by cargo
7 | #
8 | # already existing elements were commented out
9 |
10 | #/target
11 |
--------------------------------------------------------------------------------
/Cargo.lock:
--------------------------------------------------------------------------------
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525 | checksum = "49874b5167b65d7193b8aba1567f5c7d93d001cafc34600cee003eda787e483f"
526 |
527 | [[package]]
528 | name = "wasi"
529 | version = "0.11.0+wasi-snapshot-preview1"
530 | source = "registry+https://github.com/rust-lang/crates.io-index"
531 | checksum = "9c8d87e72b64a3b4db28d11ce29237c246188f4f51057d65a7eab63b7987e423"
532 |
533 | [[package]]
534 | name = "windows-sys"
535 | version = "0.52.0"
536 | source = "registry+https://github.com/rust-lang/crates.io-index"
537 | checksum = "282be5f36a8ce781fad8c8ae18fa3f9beff57ec1b52cb3de0789201425d9a33d"
538 | dependencies = [
539 | "windows-targets",
540 | ]
541 |
542 | [[package]]
543 | name = "windows-targets"
544 | version = "0.52.5"
545 | source = "registry+https://github.com/rust-lang/crates.io-index"
546 | checksum = "6f0713a46559409d202e70e28227288446bf7841d3211583a4b53e3f6d96e7eb"
547 | dependencies = [
548 | "windows_aarch64_gnullvm",
549 | "windows_aarch64_msvc",
550 | "windows_i686_gnu",
551 | "windows_i686_gnullvm",
552 | "windows_i686_msvc",
553 | "windows_x86_64_gnu",
554 | "windows_x86_64_gnullvm",
555 | "windows_x86_64_msvc",
556 | ]
557 |
558 | [[package]]
559 | name = "windows_aarch64_gnullvm"
560 | version = "0.52.5"
561 | source = "registry+https://github.com/rust-lang/crates.io-index"
562 | checksum = "7088eed71e8b8dda258ecc8bac5fb1153c5cffaf2578fc8ff5d61e23578d3263"
563 |
564 | [[package]]
565 | name = "windows_aarch64_msvc"
566 | version = "0.52.5"
567 | source = "registry+https://github.com/rust-lang/crates.io-index"
568 | checksum = "9985fd1504e250c615ca5f281c3f7a6da76213ebd5ccc9561496568a2752afb6"
569 |
570 | [[package]]
571 | name = "windows_i686_gnu"
572 | version = "0.52.5"
573 | source = "registry+https://github.com/rust-lang/crates.io-index"
574 | checksum = "88ba073cf16d5372720ec942a8ccbf61626074c6d4dd2e745299726ce8b89670"
575 |
576 | [[package]]
577 | name = "windows_i686_gnullvm"
578 | version = "0.52.5"
579 | source = "registry+https://github.com/rust-lang/crates.io-index"
580 | checksum = "87f4261229030a858f36b459e748ae97545d6f1ec60e5e0d6a3d32e0dc232ee9"
581 |
582 | [[package]]
583 | name = "windows_i686_msvc"
584 | version = "0.52.5"
585 | source = "registry+https://github.com/rust-lang/crates.io-index"
586 | checksum = "db3c2bf3d13d5b658be73463284eaf12830ac9a26a90c717b7f771dfe97487bf"
587 |
588 | [[package]]
589 | name = "windows_x86_64_gnu"
590 | version = "0.52.5"
591 | source = "registry+https://github.com/rust-lang/crates.io-index"
592 | checksum = "4e4246f76bdeff09eb48875a0fd3e2af6aada79d409d33011886d3e1581517d9"
593 |
594 | [[package]]
595 | name = "windows_x86_64_gnullvm"
596 | version = "0.52.5"
597 | source = "registry+https://github.com/rust-lang/crates.io-index"
598 | checksum = "852298e482cd67c356ddd9570386e2862b5673c85bd5f88df9ab6802b334c596"
599 |
600 | [[package]]
601 | name = "windows_x86_64_msvc"
602 | version = "0.52.5"
603 | source = "registry+https://github.com/rust-lang/crates.io-index"
604 | checksum = "bec47e5bfd1bff0eeaf6d8b485cc1074891a197ab4225d504cb7a1ab88b02bf0"
605 |
606 | [[package]]
607 | name = "zerocopy"
608 | version = "0.7.35"
609 | source = "registry+https://github.com/rust-lang/crates.io-index"
610 | checksum = "1b9b4fd18abc82b8136838da5d50bae7bdea537c574d8dc1a34ed098d6c166f0"
611 | dependencies = [
612 | "byteorder",
613 | "zerocopy-derive",
614 | ]
615 |
616 | [[package]]
617 | name = "zerocopy-derive"
618 | version = "0.7.35"
619 | source = "registry+https://github.com/rust-lang/crates.io-index"
620 | checksum = "fa4f8080344d4671fb4e831a13ad1e68092748387dfc4f55e356242fae12ce3e"
621 | dependencies = [
622 | "proc-macro2",
623 | "quote",
624 | "syn",
625 | ]
626 |
--------------------------------------------------------------------------------
/Cargo.toml:
--------------------------------------------------------------------------------
1 | [package]
2 | name = "file-encryptor"
3 | version = "1.0.0"
4 | edition = "2021"
5 |
6 | # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
7 |
8 | [dependencies]
9 | clap = { version = "4.5.4", features = ["derive"] }
10 | scrypt = { version = "0.11.0", default-features = false, features = ["std"] }
11 | aes = { version = "0.8.4" }
12 | rayon = { version = "1.10.0" }
13 | anyhow = "1.0.86"
14 | rand = { version = "0.8.5", features = ["default"] }
15 |
16 | # for testing
17 | aes-gcm = { version = "0.10.3", features = ["aes", "getrandom"] }
18 |
--------------------------------------------------------------------------------
/LICENSE:
--------------------------------------------------------------------------------
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674 | .
675 |
--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
1 | # file-encryptor
2 |
3 | A small Rust program to stream and encrypt/decrypt files securely using **Advanced Encryption
4 | Standard-Galois/Counter Mode**, or [AES-GCM](https://en.wikipedia.org/wiki/Galois/Counter_Mode),
5 | with a 256-bit key produced by
6 | [scrypt](https://en.wikipedia.org/wiki/Scrypt) key derivation function (KDF).
7 |
8 | ## Usage
9 |
10 | I wanted a small cli program that would _stream_ the file, and is flexible enough for
11 | scripting!
12 |
13 | Note that the use of additional authenticated data is not supported as of the current version.
14 |
15 | ### General Usage
16 |
17 | ```sh
18 | file-encryptor --help
19 | A Rust CLI program that streams files for encryption and decryption
20 |
21 | Usage: file-encryptor
22 |
23 | Commands:
24 | keygen generate a key, from pure random bytes, or from an input password
25 | open open an encrypted file
26 | seal seal a plaintext file
27 | help Print this message or the help of the given subcommand(s)
28 |
29 | Options:
30 | -h, --help Print help
31 | ```
32 |
33 | ### Cookbook
34 |
35 | #### 1. Key generation
36 |
37 | To encrypt a file, first a key must be generated. For example, we are using the entire text of
38 | Frankenstein in a text file as the cryptographic key, though this may be done with different file
39 | types, since it's all 1's and 0's for computers anyway.
40 |
41 | ```sh
42 | file-encryptor keygen < frankenstein.txt > secret.key
43 |
44 | # or -i and -o
45 | file-encryptor keygen -i frankenstein.txt -o secret.key
46 |
47 | # You can also pass in the option `-p` (or `--password`)
48 | # to generate key from a certain passphrase.
49 | file-encryptor keygen -p "this is my password" > secret.key
50 |
51 | # and for all pseudoramdom bytes
52 | file-encryptor keygen -r > secret.key
53 | ```
54 |
55 | #### 2. Encrypting the file `foo.plaintext`
56 |
57 | To seal (encrypt) a file, say `foo.plaintext`:
58 |
59 | ```sh
60 | # By default, it will read the first 32 bytes from stdin for as the key,
61 | # then the rest as plaintext.
62 | file-encryptor seal < secret.key < foo.plaintext > foo.ciphertext
63 |
64 | # Or passing in the file names from cli
65 | file-encryptor seal -k secret.key -i foo.plaintext -o foo.ciphertext
66 | ```
67 |
68 | #### 3. Decrypting the ciphertext file `foo.ciphertext`
69 |
70 | To open the `foo.ciphertext` file:
71 |
72 | ```sh
73 | # By default, it will read the first 32 bytes from stdin for as the key,
74 | # then the rest as ciphertext.
75 | file-encryptor open < secret.key < foo.ciphertext > foo.plaintext.decrypted
76 |
77 | # Or passing in the file names from cli
78 | file-encryptor open -k secret.key -i foo.ciphertext -o foo.plaintext.decrypted
79 | ```
80 |
81 | ## Breaking Changes
82 |
83 | The key generation schema is different, since `file-encryptor` now also streams the
84 | input key file.
85 |
--------------------------------------------------------------------------------
/src/bin/file-encryptor.rs:
--------------------------------------------------------------------------------
1 | use std::process;
2 |
3 | use clap::Parser;
4 | use file_encryptor::{
5 | command::{open, seal, Cli, Command},
6 | error,
7 | };
8 |
9 | fn main() -> error::Result<()> {
10 | let cmd = Cli::parse();
11 |
12 | let result = match cmd.cmd {
13 | Command::Open(f) => open::open(&f),
14 | Command::Seal(f) => seal::seal(&f),
15 | Command::Keygen(k) => k.gen(),
16 | };
17 |
18 | if let Err(err) = &result {
19 | eprintln!("{}", err);
20 | process::exit(err.status_code().into());
21 | }
22 |
23 | Ok(())
24 | }
25 |
--------------------------------------------------------------------------------
/src/command/keygen.rs:
--------------------------------------------------------------------------------
1 | use crate::{crypto::KEY_SIZE, error, ioutils::IO};
2 | use clap::Parser;
3 | use rand::Rng;
4 | use scrypt;
5 | use std::sync::{Arc, Mutex};
6 |
7 | type Key = [u8; KEY_SIZE];
8 | const MAX_KEY_SIZE: usize = 0xffff;
9 |
10 | struct Hash(scrypt::Params);
11 |
12 | impl Default for Hash {
13 | fn default() -> Self {
14 | // https://tobtu.com/minimum-password-settings/
15 | Self(scrypt::Params::new(16, 8, 2, KEY_SIZE).expect("invalid param for scrypt"))
16 | }
17 | }
18 |
19 | impl Hash {
20 | fn hash(&self, payload: &[u8]) -> Key {
21 | let mut key = Key::default();
22 | scrypt::scrypt(payload, &[], &self.0, &mut key)
23 | .expect("invalid keysize buffer, use constant `KEY_SIZE`");
24 | key
25 | }
26 | }
27 |
28 | struct Engine {
29 | key_buf: Key,
30 | }
31 |
32 | impl Engine {
33 | pub fn new() -> Self {
34 | let key_buf: Key = Default::default();
35 | Engine { key_buf }
36 | }
37 |
38 | pub fn update(&mut self, subkey: &Key) -> &mut Self {
39 | Self::xor_key(&mut self.key_buf, subkey);
40 | self
41 | }
42 |
43 | pub fn bytes(&self) -> &Key {
44 | &self.key_buf
45 | }
46 |
47 | fn xor_key(key_buf: &mut Key, sub_key: &Key) {
48 | for i in 0..KEY_SIZE {
49 | key_buf[i] ^= sub_key[i];
50 | }
51 | }
52 | }
53 |
54 | /// If no option, stdin...
55 | #[derive(Parser, Debug, Clone)]
56 | pub struct KeyGen {
57 | /// (optional) a passphrase used to generate key
58 | #[arg(short, long)]
59 | password: Option,
60 |
61 | /// Randomly generated, takes precedence over all other options
62 | #[arg(short, long, default_value_t = false)]
63 | rand: bool,
64 |
65 | /// (Optional) File to read in as key, default stdin
66 | #[arg(short, long)]
67 | input_file: Option,
68 |
69 | /// (Optional) File to write out, default stdout
70 | #[arg(short, long)]
71 | output_file: Option,
72 | }
73 |
74 | impl KeyGen {
75 | pub fn gen(&self) -> error::Result<()> {
76 | let mut io = IO::new(&self.input_file, &self.output_file)?;
77 | let hash = Hash(scrypt::Params::new(16, 8, 2, KEY_SIZE).expect("invalid param for scrypt"));
78 |
79 | if self.rand {
80 | Ok(with_rand(&mut io, &hash)?)
81 | } else if let Some(pw) = &self.password {
82 | Ok(with_password(&mut io, &hash, pw)?)
83 | } else {
84 | Ok(with_stdin(&mut io, &hash)?)
85 | }
86 | }
87 | }
88 |
89 | fn with_rand(io: &mut IO, hash: &Hash) -> error::Result<()> {
90 | let mut buf = [0u8; MAX_KEY_SIZE];
91 | let mut rng = rand::thread_rng();
92 | buf.iter_mut().for_each(|i| *i = rng.gen());
93 |
94 | let key = hash.hash(&buf);
95 | io.write_bytes(Engine::new().update(&key).bytes())?;
96 |
97 | Ok(())
98 | }
99 |
100 | fn with_password(io: &mut IO, hash: &Hash, pw: &String) -> error::Result<()> {
101 | let key = hash.hash(pw.as_bytes());
102 | io.write_bytes(Engine::new().update(&key).bytes())?;
103 | Ok(())
104 | }
105 |
106 | fn with_stdin(io: &mut IO, hash: &Hash) -> error::Result<()> {
107 | let keygen = Arc::new(Mutex::new(Engine::new()));
108 | let hash = Arc::new(hash);
109 |
110 | let scope: error::Result<()> = rayon::scope(|s| {
111 | loop {
112 | let mut buf = [0_u8; MAX_KEY_SIZE];
113 | let bytes_read = io.read_bytes(&mut buf)?;
114 |
115 | let keygen = Arc::clone(&keygen);
116 | let hash = Arc::clone(&hash);
117 | s.spawn(move |_| {
118 | let subkey = hash.hash(&buf);
119 | keygen
120 | .lock()
121 | .expect("unable to obtain thread lock for key generation engine")
122 | .update(&subkey);
123 | });
124 |
125 | if bytes_read < MAX_KEY_SIZE {
126 | break;
127 | }
128 | }
129 |
130 | Ok(())
131 | });
132 |
133 | scope?;
134 |
135 | let keygen = keygen
136 | .lock()
137 | .expect("unable to obtain thread lock for key generation engine");
138 | let bytes = keygen.bytes();
139 |
140 | io.write_bytes(bytes)?;
141 | Ok(())
142 | }
143 |
--------------------------------------------------------------------------------
/src/command/mod.rs:
--------------------------------------------------------------------------------
1 | use crate::ioutils::FileArg;
2 | use clap::{Parser, Subcommand};
3 |
4 | pub mod keygen;
5 | pub mod open;
6 | pub mod seal;
7 |
8 | /// A Rust CLI program that streams files for encryption and decryption.
9 | #[derive(Parser, Debug)]
10 | pub struct Cli {
11 | /// Action to perform on the input file
12 | #[command(subcommand)]
13 | pub cmd: Command,
14 | }
15 |
16 | #[derive(Subcommand, Clone, Debug)]
17 | pub enum Command {
18 | /// generate a key, from pure random bytes, or from an input password.
19 | Keygen(keygen::KeyGen),
20 |
21 | /// open an encrypted file
22 | Open(FileArg),
23 |
24 | /// seal a plaintext file
25 | Seal(FileArg),
26 | }
27 |
--------------------------------------------------------------------------------
/src/command/open.rs:
--------------------------------------------------------------------------------
1 | use std::{fs::OpenOptions, io::Read};
2 |
3 | use crate::{
4 | crypto::{block::Block, cipher::Cipher, Key, BLOCK_SIZE, IV_SIZE, KEY_SIZE},
5 | error,
6 | ioutils::{FileArg, IO},
7 | };
8 |
9 | pub fn open(arg: &FileArg) -> error::Result<()> {
10 | let mut io = IO::new(&arg.input_file, &arg.output_file)?;
11 |
12 | let key = match &arg.key {
13 | None => {
14 | let mut key = Key::default();
15 | let _ = std::io::stdin().read(&mut key)?;
16 | key
17 | }
18 | Some(filename) => {
19 | let mut file = OpenOptions::new().read(true).open(filename)?;
20 | if file.metadata()?.len() != (KEY_SIZE as u64) {
21 | return Err(error::Error::Key);
22 | }
23 |
24 | let mut key = Key::default();
25 | file.read_exact(&mut key)?;
26 | key
27 | }
28 | };
29 |
30 | let mut iv = Block::default();
31 | io.read_bytes(&mut iv.bytes_mut()[0..IV_SIZE])?;
32 |
33 | // let mut cipher = Cipher::new(key, iv, &arg.aad);
34 | let mut cipher = Cipher::new(key, iv, &None);
35 |
36 | // read in the first block
37 | let mut buf_proc = Block::default();
38 | let mut bytes_read = io.read_block(&mut buf_proc)?;
39 | if bytes_read != BLOCK_SIZE {
40 | // invalid padding
41 | return Err(error::Error::Encryption(String::from(
42 | "invalid ciphertext file",
43 | )));
44 | }
45 |
46 | let mut buf_read = Block::default();
47 | bytes_read = io.read_block(&mut buf_read)?;
48 | if bytes_read != BLOCK_SIZE {
49 | // missing auth tag
50 | return Err(error::Error::Encryption(String::from(
51 | "invalid ciphertext file",
52 | )));
53 | }
54 |
55 | let mut loop_buf = Block::default();
56 | loop {
57 | bytes_read = io.read_block(&mut loop_buf)?;
58 | if bytes_read != BLOCK_SIZE {
59 | break;
60 | }
61 |
62 | cipher.decrypt_block_inplace(&mut buf_proc);
63 | io.write_block(&buf_proc, BLOCK_SIZE)?;
64 |
65 | buf_proc.bytes_mut().copy_from_slice(buf_read.bytes());
66 | buf_read.bytes_mut().copy_from_slice(loop_buf.bytes());
67 | }
68 |
69 | // buf_proc contains the last ciphertext
70 | // buf_read contains the tag
71 | let buf_len = cipher.decrypt_block_inplace(&mut buf_proc);
72 | io.write_block(&buf_proc, buf_len)?;
73 |
74 | let decrypted_tag = buf_read.bytes();
75 | for (i, byte) in cipher.tag().bytes().iter().enumerate() {
76 | if *byte != decrypted_tag[i] {
77 | return Err(error::Error::Encryption("invalid tag".to_string()));
78 | }
79 | }
80 |
81 | Ok(())
82 | }
83 |
--------------------------------------------------------------------------------
/src/command/seal.rs:
--------------------------------------------------------------------------------
1 | use crate::{
2 | crypto::{self, block::Block, cipher, Key, BLOCK_SIZE, IV_SIZE, KEY_SIZE},
3 | error,
4 | ioutils::{FileArg, IO},
5 | };
6 | use clap::Parser;
7 | use std::{fs::OpenOptions, io::Read};
8 |
9 | #[derive(Parser, Debug, Clone)]
10 | pub struct Encryptor {
11 | /// (optional) input file, read from stdin by default
12 | #[arg(short, long)]
13 | input_file: Option,
14 |
15 | /// (optional) output file, write to stdout by default
16 | #[arg(short, long)]
17 | output_file: Option,
18 |
19 | /// (optional) additional authenticated data
20 | #[arg(short, long)]
21 | aad: Option,
22 |
23 | /// (optional) key file, read (the first) 32 byte from stdin by default
24 | #[arg(short, long)]
25 | key: Option,
26 | }
27 |
28 | pub fn seal(filearg: &FileArg) -> error::Result<()> {
29 | let mut io = IO::new(&filearg.input_file, &filearg.output_file)?;
30 |
31 | // reads in key, if `-k` flag is passed, reads from file
32 | // otherwise reads (the first) 32 bytes from stdin
33 | let key = match &filearg.key {
34 | None => {
35 | let mut buf = Key::default();
36 | std::io::stdin().read_exact(&mut buf).map_err(|err| {
37 | eprintln!("{}", err);
38 | error::Error::Key
39 | })?;
40 |
41 | buf
42 | }
43 | Some(key) => {
44 | let mut key_file = OpenOptions::new().read(true).open(key)?;
45 | if key_file.metadata()?.len() != KEY_SIZE as u64 {
46 | return Err(error::Error::Key);
47 | }
48 | let mut buf = Key::default();
49 | key_file.read_exact(&mut buf)?;
50 |
51 | buf
52 | }
53 | };
54 |
55 | // iv
56 | let iv = Block::new_iv();
57 | io.write_block(&iv, IV_SIZE)?;
58 |
59 | // let mut cipher = cipher::Cipher::new(key, iv, &filearg.aad);
60 | let mut cipher = cipher::Cipher::new(key, iv, &None);
61 |
62 | // stream file/stdin
63 | let mut eof = false;
64 | loop {
65 | let mut buf = Block::default();
66 | let bytes_read = io.read_block(&mut buf)?;
67 | if bytes_read != BLOCK_SIZE {
68 | crypto::pkcs7::pad(&mut buf, bytes_read);
69 | eof = true;
70 | }
71 |
72 | // cipher block
73 | cipher.encrypt_block_inplace(&mut buf, bytes_read);
74 | io.write_block(&buf, BLOCK_SIZE)?;
75 |
76 | if eof {
77 | break;
78 | }
79 | }
80 |
81 | io.write_block(cipher.tag(), BLOCK_SIZE)?;
82 | Ok(())
83 | }
84 |
--------------------------------------------------------------------------------
/src/crypto/block.rs:
--------------------------------------------------------------------------------
1 | use aes::cipher::generic_array::{typenum::U16, GenericArray};
2 |
3 | use crate::crypto::{BLOCK_SIZE, IV_SIZE};
4 |
5 | #[derive(Debug, Clone, Copy, Default)]
6 | pub struct Block([u8; BLOCK_SIZE]);
7 |
8 | pub const REDUCTION_POLYNOMIAL: Block =
9 | Block([0b1110_0001, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]);
10 |
11 | impl<'a> From<&'a mut Block> for &'a mut GenericArray {
12 | fn from(value: &'a mut Block) -> Self {
13 | GenericArray::from_mut_slice(&mut value.0)
14 | }
15 | }
16 |
17 | impl<'a> From<&'a Block> for &'a [u8; BLOCK_SIZE] {
18 | fn from(value: &'a Block) -> Self {
19 | &value.0
20 | }
21 | }
22 |
23 | #[cfg(test)]
24 | impl From<[u8; BLOCK_SIZE]> for Block {
25 | fn from(buf: [u8; BLOCK_SIZE]) -> Self {
26 | Self(buf)
27 | }
28 | }
29 |
30 | #[cfg(test)]
31 | impl From<[u8; IV_SIZE]> for Block {
32 | fn from(iv: [u8; IV_SIZE]) -> Self {
33 | let mut buf = [0_u8; BLOCK_SIZE];
34 | buf[..IV_SIZE].copy_from_slice(iv.as_ref());
35 | Self(buf)
36 | }
37 | }
38 |
39 | impl Block {
40 | pub fn new_iv() -> Self {
41 | use rand::RngCore;
42 |
43 | let mut buf = Block::default();
44 | rand::thread_rng().fill_bytes(&mut buf.0[..IV_SIZE]);
45 |
46 | buf
47 | }
48 |
49 | pub fn bytes_mut(&mut self) -> &mut [u8; BLOCK_SIZE] {
50 | &mut self.0
51 | }
52 |
53 | pub fn bytes(&self) -> &[u8; BLOCK_SIZE] {
54 | &self.0
55 | }
56 |
57 | pub fn iv_bytes(&self) -> &[u8] {
58 | &self.0[..IV_SIZE]
59 | }
60 |
61 | pub fn inc_counter(&mut self) {
62 | let ctr_bytes = self.0[IV_SIZE..].as_mut();
63 | let ctr_bound = ctr_bytes.len();
64 | for i in 0..ctr_bound {
65 | let byte = &mut ctr_bytes[ctr_bound - i - 1];
66 | if *byte == 255 {
67 | *byte = 0;
68 | continue;
69 | }
70 | *byte += 1;
71 | break;
72 | }
73 | }
74 |
75 | pub fn xor(&mut self, other: &Block) {
76 | for i in 0..BLOCK_SIZE {
77 | self.0[i] ^= &other.0[i]
78 | }
79 | }
80 |
81 | pub fn bin_shift_left(&mut self) {
82 | let bytes = self.bytes_mut();
83 | let mut carry_bit = 0_u8;
84 |
85 | bytes.iter_mut().rev().for_each(|byte| {
86 | let new_carry = *byte & 0b1000_0000;
87 | *byte <<= 1;
88 | *byte |= carry_bit >> 7;
89 | carry_bit = new_carry;
90 | });
91 | }
92 |
93 | pub fn bitset(&self, bit: u8) -> bool {
94 | let byte_blocks = bit / 8;
95 | let byte_blocks = BLOCK_SIZE - 1 - (byte_blocks as usize);
96 |
97 | let bit_mask = (1 << (bit % 8)) as u8;
98 | self.0[byte_blocks] & bit_mask != 0
99 | }
100 | }
101 |
102 | #[cfg(test)]
103 | mod tests {
104 | use super::*;
105 | use rand::Rng;
106 |
107 | #[test]
108 | fn block_bin_left_shift() {
109 | let mut bytes = Block::from([
110 | 0b1101_0110,
111 | 0b0010_1101,
112 | 0b1011_1000,
113 | 0b0101_0011,
114 | 0b0110_1110,
115 | 0b1001_0111,
116 | 0b1110_0001,
117 | 0b0001_1100,
118 | 0b0111_1010,
119 | 0b1000_1001,
120 | 0b1010_0110,
121 | 0b0100_1111,
122 | 0b1100_1010,
123 | 0b0011_0001,
124 | 0b1001_1111,
125 | 0b0110_0110,
126 | ]);
127 |
128 | let expected: [u8; 16] = [
129 | 0b1010_1100,
130 | 0b0101_1011,
131 | 0b0111_0000,
132 | 0b1010_0110,
133 | 0b1101_1101,
134 | 0b0010_1111,
135 | 0b1100_0010,
136 | 0b0011_1000,
137 | 0b1111_0101,
138 | 0b0001_0011,
139 | 0b0100_1100,
140 | 0b1001_1111,
141 | 0b1001_0100,
142 | 0b0110_0011,
143 | 0b0011_1110,
144 | 0b1100_1100,
145 | ];
146 |
147 | bytes.bin_shift_left();
148 | for (i, byte) in expected.iter().enumerate() {
149 | assert_eq!(bytes.0[i], *byte);
150 | }
151 | }
152 |
153 | #[test]
154 | fn bitset_in_blocks() {
155 | let mut buf = Block::default();
156 | buf.0[BLOCK_SIZE - 1] = 1;
157 |
158 | for i in 0..128 {
159 | assert!(buf.bitset(i));
160 | buf.bin_shift_left();
161 | }
162 | }
163 |
164 | #[test]
165 | fn bytes_xor() {
166 | let mut rng = rand::thread_rng();
167 |
168 | let mut left = Block::default();
169 | left.bytes_mut()
170 | .iter_mut()
171 | .for_each(|byte| *byte = rng.gen());
172 |
173 | let mut right = Block::default();
174 | right
175 | .bytes_mut()
176 | .iter_mut()
177 | .for_each(|byte| *byte = rng.gen());
178 |
179 | let mut data = left;
180 | data.xor(&right);
181 | for i in 0..BLOCK_SIZE {
182 | let expected = left.0[i] ^ right.0[i];
183 | assert_eq!(data.0[i], expected);
184 | }
185 | }
186 | }
187 |
--------------------------------------------------------------------------------
/src/crypto/cipher.rs:
--------------------------------------------------------------------------------
1 | use crate::crypto::{
2 | block::{Block, REDUCTION_POLYNOMIAL},
3 | Key, BLOCK_SIZE,
4 | };
5 | use aes::{
6 | cipher::{generic_array::GenericArray, BlockEncrypt, KeyInit},
7 | Aes256,
8 | };
9 |
10 | use super::pkcs7;
11 |
12 | #[derive(Clone)]
13 | #[allow(dead_code)]
14 | pub struct Cipher {
15 | payload_len: usize,
16 | aad_len: usize,
17 | aes: Aes256,
18 | iv: Block,
19 | counter0: Block,
20 | tag: Tag,
21 | }
22 |
23 | impl Cipher {
24 | pub fn new(key: Key, iv: Block, aad: &Option) -> Self {
25 | let aes = Aes256::new(&key.into());
26 |
27 | let mut counter0 = iv;
28 | aes.encrypt_block((&mut counter0).into());
29 |
30 | let mut h = Block::default();
31 | aes.encrypt_block((&mut h).into());
32 |
33 | let mut tag = Tag::new(counter0, h);
34 | if let Some(aad) = aad {
35 | tag.with_aad(aad.as_bytes());
36 | }
37 |
38 | let aad_len = if let Some(aad) = aad { aad.len() } else { 0 };
39 | let payload_len = 0;
40 |
41 | Self {
42 | payload_len,
43 | aad_len,
44 | aes,
45 | iv,
46 | counter0,
47 | tag,
48 | }
49 | }
50 |
51 | pub fn encrypt_block_inplace(&mut self, block: &mut Block, size: usize) {
52 | self.payload_len += size;
53 | self.iv.inc_counter();
54 |
55 | let mut ctr = self.iv;
56 | self.encrypt_block(&mut ctr);
57 |
58 | block.xor(&ctr);
59 |
60 | self.tag.compute(block);
61 | }
62 |
63 | pub fn decrypt_block_inplace(&mut self, block: &mut Block) -> usize {
64 | self.tag.compute(block);
65 | self.iv.inc_counter();
66 | let mut ctr = self.iv;
67 | self.aes.encrypt_block((&mut ctr).into());
68 | block.xor(&ctr);
69 |
70 | let size = BLOCK_SIZE - pkcs7::unpad(block);
71 | self.payload_len += size;
72 |
73 | size
74 | }
75 |
76 | pub fn tag(&mut self) -> &Block {
77 | let mut block = Block::default();
78 | block.bytes_mut()[..8].copy_from_slice(&self.payload_len.to_be_bytes());
79 | block.bytes_mut()[8..].copy_from_slice(&self.aad_len.to_be_bytes());
80 | block.xor(self.tag.block());
81 | self.tag.compute(&block);
82 |
83 | self.tag.tag_buf.xor(&self.tag.counter_0);
84 |
85 | &self.tag.tag_buf
86 | }
87 |
88 | fn encrypt_block(&self, block: &mut Block) {
89 | self.aes
90 | .encrypt_block(GenericArray::from_mut_slice(block.bytes_mut()));
91 | }
92 | }
93 |
94 | #[derive(Clone, Debug)]
95 | pub struct Tag {
96 | counter_0: Block,
97 | h: Block,
98 | tag_buf: Block,
99 | }
100 |
101 | impl Tag {
102 | fn new(counter_0: Block, h: Block) -> Self {
103 | Self {
104 | counter_0,
105 | h,
106 | tag_buf: Block::default(),
107 | }
108 | }
109 |
110 | fn with_aad(&mut self, mut auth_data: &[u8]) {
111 | let mut eof = false;
112 | let mut block = Block::default();
113 | while !eof {
114 | let aad_block = if auth_data.len() != BLOCK_SIZE {
115 | block = Block::default();
116 | block.bytes_mut().copy_from_slice(auth_data.as_ref());
117 | eof = true;
118 | block
119 | } else {
120 | block
121 | .bytes_mut()
122 | .copy_from_slice(auth_data[..BLOCK_SIZE].as_ref());
123 | block
124 | };
125 |
126 | self.compute(&aad_block);
127 |
128 | if eof {
129 | break;
130 | }
131 |
132 | auth_data = &auth_data[BLOCK_SIZE..];
133 | }
134 | }
135 |
136 | fn block(&self) -> &Block {
137 | &self.tag_buf
138 | }
139 |
140 | fn compute(&mut self, block: &Block) {
141 | self.tag_buf.xor(block);
142 | self.tag_buf = Self::galois_multiply(&self.tag_buf, &self.h);
143 | }
144 |
145 | fn galois_multiply(x: &Block, y: &Block) -> Block {
146 | let mut z = Block::default();
147 | let mut v = *x;
148 |
149 | for i in 0..128 {
150 | if y.bitset(i) {
151 | z.xor(&v);
152 | }
153 |
154 | let msb_set = v.bitset(127);
155 | v.bin_shift_left();
156 | if msb_set {
157 | v.xor(&REDUCTION_POLYNOMIAL);
158 | }
159 | }
160 |
161 | z
162 | }
163 | }
164 |
165 | #[cfg(test)]
166 | mod tests {
167 | use super::*;
168 | use crate::crypto::{BLOCK_SIZE, IV_SIZE};
169 |
170 | #[test]
171 | fn test_iv_new() {
172 | let iv = Block::new_iv();
173 | let buf: &[u8; BLOCK_SIZE] = (&iv).into();
174 | assert_eq!(buf[IV_SIZE..].len(), 4);
175 | buf[IV_SIZE..]
176 | .iter()
177 | .for_each(|&byte| assert_eq!(byte, 0u8))
178 | }
179 |
180 | #[test]
181 | fn test_iv_bytes() {
182 | let bytes = Block::new_iv();
183 | let bytes = bytes.iv_bytes();
184 | assert_eq!(bytes.len(), IV_SIZE);
185 |
186 | let bytes2 = Block::new_iv();
187 | let bytes2 = bytes2.iv_bytes();
188 | assert_ne!(bytes, bytes2);
189 | }
190 |
191 | #[test]
192 | fn test_iv_inc_counter() {
193 | let mut iv = Block::new_iv();
194 | for ele in iv.bytes()[IV_SIZE..].iter() {
195 | assert_eq!(*ele, 0);
196 | }
197 |
198 | iv.inc_counter();
199 | assert_eq!(iv.bytes()[BLOCK_SIZE - 1], 1);
200 |
201 | iv.inc_counter();
202 | assert_eq!(iv.bytes()[BLOCK_SIZE - 1], 2);
203 |
204 | // bit wrapping
205 | iv.bytes_mut()[BLOCK_SIZE - 1] = 255;
206 | iv.inc_counter();
207 | assert_eq!(iv.bytes()[BLOCK_SIZE - 1], 0);
208 | assert_eq!(iv.bytes()[BLOCK_SIZE - 2], 1);
209 |
210 | // at max counter, wraps back to 0
211 | for ele in iv.bytes_mut()[IV_SIZE..].iter_mut() {
212 | *ele = 255;
213 | }
214 |
215 | iv.inc_counter();
216 | for ele in iv.bytes()[IV_SIZE..].iter() {
217 | assert_eq!(*ele, 0);
218 | }
219 | }
220 |
221 | #[test]
222 | fn test_cipher_encrypt_in_place() {
223 | let key: Key = [
224 | 0x6B, 0x38, 0x46, 0x7A, 0x58, 0x77, 0x32, 0x61, 0x4C, 0x70, 0x51, 0x39, 0x76, 0x4A,
225 | 0x33, 0x6E, 0x47, 0x6D, 0x34, 0x52, 0x30, 0x79, 0x55, 0x63, 0x48, 0x74, 0x42, 0x73,
226 | 0x56, 0x37, 0x64, 0x59,
227 | ];
228 |
229 | let iv = Block::from([
230 | 0x3A, 0x9F, 0xB4, 0x7E, 0x2D, 0x1C, 0xF8, 0x05, 0x9C, 0x7B, 0xA2, 0x6D,
231 | ]);
232 |
233 | let mut cipher = Cipher::new(key, iv, &None);
234 |
235 | let plaintext = Block::from([
236 | 0x5A, 0x37, 0x71, 0x50, 0x39, 0x6B, 0x54, 0x62, 0x58, 0x31, 0x4C, 0x72, 0x34, 0x57,
237 | 0x6D, 0x4A,
238 | ]);
239 |
240 | let ciphertext = Block::from([
241 | 0xEE, 0x0D, 0x0A, 0x0D, 0xD1, 0x2D, 0xE2, 0x48, 0x2B, 0xFF, 0xE9, 0x82, 0x8F, 0x2F,
242 | 0x9A, 0xB9,
243 | ]);
244 |
245 | let mut block = plaintext;
246 |
247 | cipher.encrypt_block_inplace(&mut block, BLOCK_SIZE);
248 |
249 | assert_ne!(block.bytes(), ciphertext.bytes());
250 | }
251 |
252 | #[test]
253 | fn test_cipher_encryption() {
254 | let key: Key = [
255 | 0x6B, 0x38, 0x46, 0x7A, 0x58, 0x77, 0x32, 0x61, 0x4C, 0x70, 0x51, 0x39, 0x76, 0x4A,
256 | 0x33, 0x6E, 0x47, 0x6D, 0x34, 0x52, 0x30, 0x79, 0x55, 0x63, 0x48, 0x74, 0x42, 0x73,
257 | 0x56, 0x37, 0x64, 0x59,
258 | ];
259 |
260 | let iv = Block::from([
261 | 0x3A, 0x9F, 0xB4, 0x7E, 0x2D, 0x1C, 0xF8, 0x05, 0x9C, 0x7B, 0xA2, 0x6D,
262 | ]);
263 |
264 | let mut cipher = Cipher::new(key, iv, &None);
265 | let mut cipher2 = cipher.clone();
266 |
267 | let plaintext = Block::from([
268 | 0xEE, 0x0D, 0x0A, 0x0D, 0xD1, 0x2D, 0xE2, 0x48, 0x2B, 0xFF, 0xE9, 0x82, 0x8F, 0x2F,
269 | 0x9A, 0xB9,
270 | ]);
271 |
272 | let mut block = plaintext;
273 |
274 | cipher.encrypt_block_inplace(&mut block, BLOCK_SIZE);
275 | cipher2.decrypt_block_inplace(&mut block);
276 |
277 | assert_eq!(block.bytes(), plaintext.bytes());
278 | }
279 | }
280 |
--------------------------------------------------------------------------------
/src/crypto/mod.rs:
--------------------------------------------------------------------------------
1 | pub mod block;
2 | pub mod cipher;
3 | pub mod pkcs7;
4 |
5 | pub const IV_SIZE: usize = 12;
6 | pub const BLOCK_SIZE: usize = 16;
7 | pub const KEY_SIZE: usize = 32;
8 |
9 | pub type Key = [u8; KEY_SIZE];
10 |
--------------------------------------------------------------------------------
/src/crypto/pkcs7.rs:
--------------------------------------------------------------------------------
1 | use crate::crypto::{block::Block, BLOCK_SIZE};
2 |
3 | pub fn pad(block: &mut Block, block_size: usize) {
4 | let block_len = BLOCK_SIZE;
5 | let pad_value = block_len - block_size;
6 | let bytes = block.bytes_mut();
7 | for i in 0..pad_value {
8 | bytes[block_len - 1 - i] = pad_value as u8;
9 | }
10 | }
11 |
12 | /// returns the number of padding bytes removed
13 | pub fn unpad(block: &mut Block) -> usize {
14 | let block_len = BLOCK_SIZE;
15 |
16 | let bytes = block.bytes_mut();
17 | let last_byte = bytes[block_len - 1];
18 |
19 | // check if padding exists
20 | let mut bytes_padded = 0;
21 | for i in 0..(last_byte as usize) {
22 | if bytes[block_len - 1 - i] != last_byte {
23 | return 0;
24 | }
25 | bytes_padded += 1;
26 | }
27 |
28 | // remove padding
29 | for i in 0..(last_byte as usize) {
30 | bytes[block_len - 1 - i] = 0;
31 | }
32 |
33 | bytes_padded
34 | }
35 |
36 | #[cfg(test)]
37 | mod tests {
38 | use super::*;
39 |
40 | #[test]
41 | fn pkcs7_pad() {
42 | let mut block = Block::default();
43 | pad(&mut block, 3);
44 | for i in 3..16 {
45 | assert_eq!(block.bytes()[i], 13);
46 | }
47 |
48 | let mut block = Block::default();
49 | pad(&mut block, 0);
50 | for i in 0..16 {
51 | assert_eq!(block.bytes()[i], 16);
52 | }
53 | }
54 |
55 | #[test]
56 | fn pkcs7_unpad() {
57 | let mut block = Block::default();
58 | pad(&mut block, 3);
59 | let padded_bytes = unpad(&mut block);
60 | assert_eq!(padded_bytes, BLOCK_SIZE - 3);
61 | for i in 3..16 {
62 | assert_eq!(block.bytes()[i], 0);
63 | }
64 |
65 | let mut block = Block::default();
66 | pad(&mut block, 0);
67 | unpad(&mut block);
68 | for i in 0..16 {
69 | assert_eq!(block.bytes()[i], 0);
70 | }
71 | }
72 | }
73 |
--------------------------------------------------------------------------------
/src/error.rs:
--------------------------------------------------------------------------------
1 | use std::{error, fmt, io, process, result};
2 |
3 | pub type Result = result::Result;
4 |
5 | #[derive(Debug)]
6 | pub enum Error {
7 | IO(String),
8 | Key,
9 | Encryption(String),
10 | Other(String),
11 | }
12 |
13 | impl Error {
14 | pub fn status_code(&self) -> u8 {
15 | match self {
16 | Self::Other(_) => 1,
17 | Self::IO(_) => 2,
18 | Self::Key => 3,
19 | Self::Encryption(_) => 4,
20 | }
21 | }
22 | }
23 |
24 | impl error::Error for Error {}
25 |
26 | unsafe impl Send for Error {}
27 |
28 | impl fmt::Display for Error {
29 | fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
30 | match self {
31 | Self::IO(msg) => write!(f, "{}", msg),
32 | Self::Key => write!(f, "Invalid key"),
33 | Self::Other(msg) => write!(f, "{}", msg),
34 | Self::Encryption(msg) => write!(f, "{}", msg),
35 | }
36 | }
37 | }
38 |
39 | impl process::Termination for Error {
40 | fn report(self) -> process::ExitCode {
41 | self.status_code().into()
42 | }
43 | }
44 |
45 | impl From for Error {
46 | fn from(value: std::io::Error) -> Self {
47 | Self::IO(value.to_string())
48 | }
49 | }
50 |
51 | impl From for Error {
52 | fn from(value: anyhow::Error) -> Self {
53 | Self::Other(value.to_string())
54 | }
55 | }
56 |
--------------------------------------------------------------------------------
/src/ioutils.rs:
--------------------------------------------------------------------------------
1 | use std::{
2 | fs::{File, OpenOptions},
3 | io::{Read, Write},
4 | };
5 |
6 | use clap::Parser;
7 |
8 | use crate::crypto::block::Block;
9 |
10 | #[derive(Parser, Debug, Clone)]
11 | pub struct FileArg {
12 | /// (optional) input file, read from stdin by default
13 | #[arg(short, long)]
14 | pub input_file: Option,
15 |
16 | /// (optional) output file, write to stdout by default
17 | #[arg(short, long)]
18 | pub output_file: Option,
19 |
20 | /*
21 | /// (optional) additional authenticated data
22 | #[arg(short, long)]
23 | pub aad: Option,
24 | */
25 |
26 | /// (optional) key file, read (the first) 32 byte from stdin by default
27 | #[arg(short, long)]
28 | pub key: Option,
29 | }
30 |
31 | #[derive(Debug)]
32 | pub struct IO {
33 | filein: Option,
34 | fileout: Option,
35 | }
36 |
37 | impl IO {
38 | pub fn new(filein: &Option, fileout: &Option) -> std::io::Result {
39 | let filein = if let Some(filename) = filein {
40 | Some(OpenOptions::new().read(true).open(filename)?)
41 | } else {
42 | None
43 | };
44 |
45 | let fileout = if let Some(filename) = fileout {
46 | Some(
47 | OpenOptions::new()
48 | .create(true)
49 | .truncate(true)
50 | .write(true)
51 | .open(filename)?,
52 | )
53 | } else {
54 | None
55 | };
56 |
57 | Ok(Self { filein, fileout })
58 | }
59 |
60 | pub fn read_block(&mut self, block: &mut Block) -> std::io::Result {
61 | match &mut self.filein {
62 | None => std::io::stdin().read(block.bytes_mut()),
63 | Some(fd) => fd.read(block.bytes_mut()),
64 | }
65 | }
66 |
67 | pub fn write_block(&mut self, block: &Block, n: usize) -> std::io::Result {
68 | match &mut self.fileout {
69 | None => std::io::stdout().write(&block.bytes()[..n]),
70 | Some(fd) => fd.write(&block.bytes()[..n]),
71 | }
72 | }
73 |
74 | pub fn read_bytes(&mut self, bytes: &mut [u8]) -> std::io::Result {
75 | match &mut self.filein {
76 | None => std::io::stdin().read(bytes),
77 | Some(fd) => fd.read(bytes),
78 | }
79 | }
80 |
81 | pub fn write_bytes(&mut self, bytes: &[u8]) -> std::io::Result {
82 | match &mut self.fileout {
83 | None => std::io::stdout().write(bytes),
84 | Some(fd) => fd.write(bytes),
85 | }
86 | }
87 | }
88 |
--------------------------------------------------------------------------------
/src/lib.rs:
--------------------------------------------------------------------------------
1 | pub mod error;
2 | pub mod command;
3 | pub mod crypto;
4 | pub mod ioutils;
5 |
--------------------------------------------------------------------------------