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Kristofers Solo 2025-09-29 15:36:44 +03:00
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.gitignore vendored Normal file
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#--------------------------------------------------#
# The following was generated with gitignore.nvim: #
#--------------------------------------------------#
# Gitignore for the following technologies: Rust
# Generated by Cargo
# will have compiled files and executables
debug/
target/
# Remove Cargo.lock from gitignore if creating an executable, leave it for libraries
# More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html
Cargo.lock
# These are backup files generated by rustfmt
**/*.rs.bk
# MSVC Windows builds of rustc generate these, which store debugging information
*.pdb

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Cargo.toml Normal file
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[package]
name = "des"
version = "0.1.0"
authors = ["Kristofers Solo <dev@kristofers.xyz>"]
edition = "2024"
[dependencies]
[dev-dependencies]
claims = "0.8"
rand = "0.9"
[lints.clippy]
pedantic = "warn"
nursery = "warn"
unwrap_used = "warn"

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#[derive(Debug)]
pub struct DES {
pub subkeys: [u64; 16],
_s_boxes: Vec<Vec<Vec<u8>>>,
}
impl DES {
#[must_use]
pub fn new(key: u64) -> Self {
let mut des = Self {
subkeys: [0; 16],
_s_boxes: Vec::new(),
};
des.generate_subkeys(key);
des
}
#[must_use]
pub fn encrypt(&self, _plaintext: u64) -> u64 {
todo!()
}
#[must_use]
pub fn decrypt(&self, _plaintext: u64) -> u64 {
todo!()
}
#[must_use]
pub fn ip(&self, _input: u64) -> u64 {
todo!()
}
#[must_use]
pub fn pc1(&self, _key: u64) -> u64 {
todo!()
}
#[must_use]
pub fn expand(&self, _right_half: u32) -> u64 {
todo!()
}
#[must_use]
pub fn permutate_output(&self, _input: u32) -> u32 {
todo!()
}
#[must_use]
pub fn feistel(&self, _right: u32, _subkey: u64) -> u32 {
todo!()
}
fn generate_subkeys(&mut self, _key: u64) {
todo!()
}
}
/// Encrypts data using ECB mode.
///
/// # Arguments
/// - `data` - Plaintext bytes (must be multiple of 8 for ECB)
/// - `key` - 8-byte DES key
///
/// # Returns
///
/// Ciphertext as Vec<u8>, same length as input
///
/// # Panics
///
/// If data length is not multiple of 8 bytes
#[must_use]
pub fn encrypt_ecb(_data: &[u8], _key: &[u8; 8]) -> Vec<u8> {
todo!()
}
/// Decrypts ECB-encrypted data.
///
/// # Arguments
/// - `data` - Plaintext bytes (must be multiple of 8 for ECB)
/// - `key` - 8-byte DES key
///
/// # Returns
///
/// Ciphertext as Vec<u8>, same length as input
///
/// # Panics
///
/// If data length is not multiple of 8 bytes
#[must_use]
pub fn decrypt_ecb(_data: &[u8], _key: &[u8; 8]) -> Vec<u8> {
todo!()
}
#[cfg(test)]
mod tests {
use super::*;
use claims::assert_le;
use rand::random;
use std::time::Instant;
const TEST_KEY: u64 = 0x133457799BBCDFF1;
const RIGHT_KEY: u32 = 0x12345678;
const TEST_PLAINTEXT: u64 = 0x0123456789ABCDEF;
const TEST_CIPHERTEXT: u64 = 0x85E813540F0AB405;
impl DES {
fn apply_sboxes(&self, _input: u64) -> u32 {
// Implementation for testing S-boxes in isolation
// Return 32-bit result after 8 S-boxes
todo!()
}
}
/// Helper to create a test Des instance (use your actual key schedule)
fn des_instance() -> DES {
DES::new(TEST_KEY)
}
#[test]
fn encrypt_decrypt_roundtrip() {
let des = des_instance();
let plaintext = TEST_PLAINTEXT;
let ciphertext = des.encrypt(plaintext);
let dectrypted = des.decrypt(plaintext);
let re_ciphertext = des.encrypt(dectrypted);
assert_eq!(ciphertext, TEST_CIPHERTEXT, "Encyption failed");
assert_eq!(re_ciphertext, TEST_CIPHERTEXT, "Re-Encyption failed");
}
#[test]
fn weak_keys_rejected() {
let weak_keys = [0x0101010101010101, 0xFEFEFEFEFEFEFEFE, 0xE001E001E001E001];
for key in weak_keys {
let des = DES::new(key);
let plaintext = TEST_PLAINTEXT;
let encrypted = des.encrypt(plaintext);
let dectrypted = des.decrypt(encrypted);
assert_eq!(dectrypted, plaintext, "Weak key {key} failed roundtrip");
}
}
#[test]
fn multiple_blocks() {
let des = des_instance();
let blocks = [
(0x0123456789ABCDEFu64, 0x85E813540F0AB405u64),
(0xFEDCBA9876543210u64, 0xC08BF0FF627D3E6Fu64), // Another test vector
(0x0000000000000000u64, 0x474D5E3B6F8A07F8u64), // Zero block
];
for (plaintext, expected) in blocks {
let encrypted = des.encrypt(plaintext);
assert_eq!(encrypted, expected, "Failed on plaintext: {plaintext:016X}");
let dectrypted = des.decrypt(encrypted);
assert_eq!(dectrypted, plaintext, "Roundtrip failed on block");
}
}
#[test]
fn key_schedule_generates_correct_subkeys() {
let expected_subkeys = [
0xF3FDFBF373848CF5u64,
0xF3738CF548C4F3F5u64,
0x848C4F3F5F373848u64,
];
let des = des_instance();
let generated = des.subkeys;
for (idx, &expected) in expected_subkeys.iter().enumerate() {
let masked_gen = generated[idx];
let masked_exp = expected;
assert_eq!(
masked_gen, masked_exp,
"Subkey {idx} mismatch: expected {masked_exp:012X}, got {masked_gen:012X}"
);
}
}
#[test]
fn initial_permutation() {
let input = TEST_KEY;
let expected_ip = 0xC2B093C7A3A7C24A;
let result = des_instance().ip(input);
assert_eq!(result, expected_ip, "Initial permulation failed");
}
#[test]
fn pc1_permutaion_correct() {
let des = des_instance();
let key = TEST_KEY;
let expected_pc1 = 0x0A2B3C4D5E6F789A; // Truncated 56 bits from spec
let result = des.pc1(key);
let masked_result = result & 0x00FF_FFFF_FFFF_FFFF; // 56 bits
let masked_expected = expected_pc1 & 0x00FF_FFFF_FFFF_FFFF;
assert_eq!(masked_result, masked_expected, "PC1 permutation failed");
}
#[test]
fn expansion_permutation() {
let des = des_instance();
let right_half = RIGHT_KEY;
let expanded = des.expand(right_half);
// Expansion should produce 48 bits from 32
assert_eq!(expanded >> 48, 0, "Expandsion exceeds 48 bits");
// Test that expansion duplicates bits correctly
// Bit 0 of expanded should match bit 31 of input (EXPANSION[0]=32)
assert_eq!(
(expanded >> 47) & 1,
((right_half as u64) >> 31) & 1,
"Expansion bit 0 failed"
);
// Bit 1 should match bit 0 (EXPANSION[1]=1)
assert_eq!(
(expanded >> 46) & 1,
(right_half as u64) & 1,
"Expansion bit 1 failed"
);
// Test wraparound: bit 47 should match bit 0 again (EXPANSION[47]=1)
assert_eq!(
expanded & 1,
(right_half as u64) & 1,
"Expansion wraparound failed"
);
}
#[test]
fn sbox_subsitution() {
let des = des_instance();
let sbox_tests = [
// (box_idx, 6-bit input, expected 4-bit output)
(0, 0b000000, 14), // S1: 00 0000 -> row 0, col 0 -> 14
(0, 0b011111, 9), // S1: 01 1111 -> row 1, col 15 -> 9
(1, 0b100000, 0), // S2: 10 0000 -> row 2, col 0 -> 0
(2, 0b001010, 2), // S3: 00 1010 -> row 0, col 10 -> 2
];
for (box_idx, input, expected) in sbox_tests {
let row = (input & 1) | ((input >> 4) & 0x2);
let col = (input >> 1) & 0xF;
let val = des._s_boxes[box_idx][row as usize][col as usize];
assert_eq!(
val,
expected as u8,
"S{} failed: input {input:06b} (row {row}, col {col}) expected {expected}, got {val}",
box_idx + 1
);
}
}
#[test]
fn permuation_pbox() {
let des = des_instance();
let input = RIGHT_KEY;
let result = des.permutate_output(input);
// P-box should preserve all bits (32 in, 32 out), just reorder
let bit_count = input.count_ones();
let result_bit_count = result.count_ones();
assert_eq!(bit_count, result_bit_count, "P-box changes bit count");
// Test specific bit mapping: PERMUTATION[0]=16 means bit 15 (0-based) of output = bit 15 of input
let input_bit_15 = (input >> 15) & 1;
let output_bit_0 = (result >> 31) & 1; // MSB first
assert_eq!(input_bit_15, output_bit_0, "P-box bit mapping failed");
}
#[test]
fn feistel_function_properties() {
let des = des_instance();
let right = RIGHT_KEY;
let subkey = 0xFEDCBA9876543210 & 0xFFFF_FFFF_FFFF;
let feistel_result = des.feistel(right, subkey);
// Feistel output should always be 32 bits
assert_le!(feistel_result, u32::MAX, "Feistel output exceeds 32 bits");
// Test that zero subkey produces deterministic result
let zero_subkey_result = des.feistel(right, 0);
let zero_expanded = des.expand(right);
let sbox_result = des.apply_sboxes(zero_expanded);
let expected = des.permutate_output(sbox_result as u32);
assert_eq!(zero_subkey_result, expected, "Feistel with zero key failed");
}
#[test]
fn all_zero_paintext() {
let des = des_instance();
let plain = 0;
let encrypted = des.encrypt(plain);
let decrypted = des.decrypt(encrypted);
assert_eq!(decrypted, plain, "All-zero plaintext failed");
}
#[test]
fn all_one_paintext() {
let des = des_instance();
let plain = 1;
let encrypted = des.encrypt(plain);
let decrypted = des.decrypt(encrypted);
assert_eq!(decrypted, plain, "All-one plaintext failed");
}
#[test]
fn different_inputs() {
let des = des_instance();
let plain1 = 0x0000000000000001;
let plain2 = 0x0000000000000002;
let enc1 = des.encrypt(plain1);
let enc2 = des.encrypt(plain2);
assert_ne!(
enc1, enc2,
"Encryption not deterministic for different inputs"
);
}
#[test]
#[should_panic(expected = "Invalid key size")]
fn invalid_key_size() {
DES::new(0);
}
#[test]
fn performance() {
let des = des_instance();
let plaintext = TEST_PLAINTEXT;
let start = Instant::now();
for _ in 0..10000 {
des.encrypt(plaintext);
}
let duration = start.elapsed();
println!("10k encryption took: {duration:?}");
// Reasonable benchmark: should be under 1ms on modern hardware
assert!(duration.as_millis() < 100, "Performance degraded");
}
#[test]
fn fuzz_properties() {
let des = des_instance();
for _ in 0..100 {
let plaintext = random();
let encrypted = des.encrypt(plaintext);
let decrypted = des.decrypt(plaintext);
assert_eq!(decrypted, encrypted, "Fuzz roundtrip failed");
assert_ne!(encrypted, plaintext, "Encryption is identity function");
let key2 = random();
if key2 != TEST_KEY {
let des2 = DES::new(key2);
let encrypted2 = des2.encrypt(plaintext);
assert_ne!(
encrypted, encrypted2,
"Different keys produced same encryption"
);
}
}
}
}

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use des::DES;
#[test]
fn test_ecb_mode_equivalence() {
// If you implement ECB mode, test it matches single block
let key = 0x1334_5779_9BBC_DFF1;
let des = DES::new(key);
let plain = 0x0123_4567_89AB_CDEF;
let _single_block = des.encrypt(plain);
// let ecb_result = encrypt_ecb(&[plain]);
// assert_eq!(single_block, ecb_result[0]);
}
#[test]
fn test_with_real_data() {
// Test with actual 8-byte data
let key_bytes = b"KGenius\x01";
let key = u64::from_le_bytes(*key_bytes);
let data_bytes = b"HelloDES!";
let mut padded = [0u8; 8];
padded[..data_bytes.len()].copy_from_slice(data_bytes);
let plaintext = u64::from_le_bytes(padded);
let des = DES::new(key);
let encrypted = des.encrypt(plaintext);
// Verify we can roundtrip
let decrypted = des.decrypt(encrypted);
let decrypted_bytes = decrypted.to_le_bytes();
assert_eq!(decrypted_bytes[..data_bytes.len()], *data_bytes);
}

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use des::DES;
// Full expected subkeys for TEST_KEY (48 bits each, from FIPS spec)
const EXPECTED_SUBKEYS: [u64; 16] = [
0xF3FDFBF373848CF5u64,
0xF3738CF548C4F3F5u64,
0x848C4F3F5F373848u64,
0xC4F3F5F373848CCFu64,
0xF3F5F373848CCF39u64,
0x5F373848CCF39A7Au64,
0x373848CCF39A7A29u64,
0x848CCF39A7A29D6Bu64,
0xCCF39A7A29D6B3E6u64,
0xF39A7A29D6B3E674u64,
0x9A7A29D6B3E674F1u64,
0x7A29D6B3E674F1D3u64,
0x29D6B3E674F1D39Bu64,
0xD6B3E674F1D39BFAu64,
0xB3E674F1D39BFACFu64,
0xE674F1D39BFACF3Fu64,
];
const TEST_KEY: u64 = 0x133457799BBCDFF1;
#[test]
fn test_full_key_schedule() {
let des = DES::new(TEST_KEY);
for (i, &expected) in EXPECTED_SUBKEYS.iter().enumerate() {
let masked_gen = des.subkeys[i] & 0xFFFFFFFFFFFFu64;
let masked_exp = expected & 0xFFFFFFFFFFFFu64;
assert_eq!(
masked_gen, masked_exp,
"Subkey {} failed: expected {:012X}, got {:012X}",
i, masked_exp, masked_gen
);
}
}
#[test]
fn test_rotation_shifts() {
// Test the left rotation logic in key schedule
let mut c: u32 = 0x0FFFFFFF; // 28 bits all 1s
c = c.rotate_left(1);
assert_eq!(c, 0x1FFFFFFF >> 4, "Single bit rotation failed");
// Test double shift
let mut d: u32 = 0xAAAAAAA; // 101010... pattern
d = d.rotate_left(2);
assert_eq!(d, 0x2AAAAAA, "Double rotation failed"); // Check pattern shift
}
#[test]
fn test_weak_key_detection() {
let weak_keys = [
0x0101010101010101u64, // All odd parity
0xFEFEFEFEFEFEFEFEu64, // All even parity
0x1F1F1F1F0E0E0E0Eu64, // Semi-weak
];
for key in weak_keys {
let des = DES::new(key);
// Weak keys often produce subkeys that don't vary much
let subkeys = &des.subkeys;
let first = subkeys[0];
let last = subkeys[15];
// For true weak keys, many subkeys may be identical
// This is just a basic check - implement full weak key analysis if desired
println!(
"Weak key {} subkeys: first={:012X}, last={:012X}",
key,
first & 0xFFFFFFFFFFFF,
last & 0xFFFFFFFFFFFF
);
}
}