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https://github.com/kristoferssolo/des-rs.git
synced 2025-12-20 11:04:38 +00:00
feat: finish pc1 implementation
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GPG Key ID:
8687F2D3EEE6F0ED
@ -13,20 +13,22 @@ pub const FP: [u8; 64] = [
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34, 2, 42, 10, 50, 18, 58, 26, 33, 1, 41, 9, 49, 17, 57, 25,
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];
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/// PC1 table (64 to 56 bits).
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pub const PC1: [u8; 64] = [
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/// Key Permutation table (64 to 56 bits).
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pub const PC1_TABLE: [u8; 56] = [
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57, 49, 41, 33, 25, 17, 9, 1, 58, 50, 42, 34, 26, 18, 10, 2, 59, 51, 43, 35, 27, 19, 11, 3, 60,
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52, 44, 36, 28, 20, 12, 4, 61, 53, 45, 37, 29, 21, 13, 5, 62, 54, 46, 38, 30, 22, 14, 6, 63,
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55, 47, 39, 31, 23, 15, 7, 0, 0, 0, 0, 0, 0, 0, 0, // Parity bits skipped
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52, 44, 36, 63, 55, 47, 39, 31, 23, 15, 7, 62, 54, 46, 38, 30, 22, 14, 6, 61, 53, 45, 37, 29,
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21, 13, 5, 28, 20, 12, 4,
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];
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/// PC2 table (56 to 48 bits).
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pub const PC2: [u8; 56] = [
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/// Compression Permutation table (56 to 48 bits).
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pub const PC2_TABLE: [u8; 48] = [
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14, 17, 11, 24, 1, 5, 3, 28, 15, 6, 21, 10, 23, 19, 12, 4, 26, 8, 16, 7, 27, 20, 13, 2, 41, 52,
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31, 37, 47, 55, 30, 40, 51, 45, 33, 48, 44, 49, 39, 56, 34, 53, 46, 42, 50, 36, 29, 32, 0, 0,
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0, 0, 0, 0, 0, 0, // Parity bits skipped
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31, 37, 47, 55, 30, 40, 51, 45, 33, 48, 44, 49, 39, 56, 34, 53, 46, 42, 50, 36, 29, 32,
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];
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/// Number of Key Bits Shifted per Round
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pub const ROUND_ROTATIONS: [u8; 16] = [1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1];
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/// Expansion permutation (32 to 48 bits).
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pub const EXPANSION: [u8; 48] = [
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32, 1, 2, 3, 4, 5, 4, 5, 6, 7, 8, 9, 8, 9, 10, 11, 12, 13, 12, 13, 14, 15, 16, 17, 16, 17, 18,
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186
src/lib.rs
186
src/lib.rs
@ -1,13 +1,13 @@
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mod constants;
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use crate::constants::PERMUTATION;
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use crate::constants::{PC1_TABLE, PC2_TABLE, PERMUTATION, ROUND_ROTATIONS};
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#[derive(Debug)]
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pub struct DES {
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pub struct Des {
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pub subkeys: [u64; 16],
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}
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impl DES {
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impl Des {
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/// Create a new DES instance from a 64-bit key (8 bytes).
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#[must_use]
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pub fn new(key: u64) -> Self {
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@ -28,9 +28,12 @@ impl DES {
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self.des(block, false)
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}
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/// Expand the right side of the data from 32 bits to 48.
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#[must_use]
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fn expand(&self, right_half: u32) -> u64 {
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todo!()
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fn expand(&self, right: u32) -> u64 {
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let bytes = right.to_le_bytes();
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dbg!(bytes);
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0
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}
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/// Feistel function: Expand, XOR with subkey, S-box, permute.
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@ -47,7 +50,15 @@ impl DES {
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/// Generate 16 subkeys from the 64-bit key.
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fn generate_subkeys(&mut self, key: u64) {
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todo!()
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let reduced_key = pc1(key);
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let (mut left, mut right) = split_key(reduced_key);
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for (idx, &shift_num) in ROUND_ROTATIONS.iter().enumerate() {
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left = shift(left, shift_num);
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right = shift(right, shift_num);
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let combined = (u64::from(right) << 28) | u64::from(left);
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let subkey = pc2(combined);
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self.subkeys[idx] = subkey;
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}
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}
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/// Helper functions for permutations (bit manipulation)
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@ -66,21 +77,89 @@ impl DES {
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todo!()
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}
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#[must_use]
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pub fn pc1(&self, input: u64) -> u64 {
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todo!()
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}
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#[must_use]
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pub fn pc2(&self, input: u64) -> u64 {
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todo!()
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}
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fn permutate_output(&self, input: u32) -> u32 {
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self.permutate(input, &PERMUTATION, 32)
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}
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}
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/// Reduces 64 bits to 56-bit key by applying PC-1 permutation.
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/// Selects 56 specific bits (ignoring 8 parity bits) and permutes them.
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///
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/// Accounts for DES specification's big-endian bit numbering (1-64, MSB first)
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/// versus Rust u64's little-endian bit numbering (0-63, LSB first).
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#[must_use]
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pub fn pc1(key: u64) -> u64 {
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PC1_TABLE
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.iter()
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.enumerate()
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.fold(0, |mut acc, (idx, &pos)| {
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// pos is 1-based DES bit position (1-64, big-endian MSB first)
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let des_bit_1based = u64::from(pos);
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let des_bit_0based = des_bit_1based.saturating_sub(1);
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// Map DES big-endian position to u64 little-endian position
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// DES bit 1 (MSB) = u64 bit 63, DES bit 64 (LSB) = u64 bit 0
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let bit_pos = 63u64.saturating_sub(des_bit_0based);
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// Extract bit from u64 at the correct position
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let bit = ((key >> bit_pos) & 1) << (55usize.saturating_sub(idx));
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acc |= bit;
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acc
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})
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}
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/// Compression permuation
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/// Reduces 56-bits to 48-bit key
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#[must_use]
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pub fn pc2(key: u64) -> u64 {
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let key_56 = key & 0x00FF_FFFF_FFFF_FFFF;
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PC2_TABLE
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.iter()
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.enumerate()
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.fold(0, |mut acc, (idx, &pos)| {
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let bit_pos = u64::from(pos).saturating_sub(1);
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let bit = ((key_56 >> bit_pos) & 1) << (47 - idx);
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acc |= bit;
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acc
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})
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}
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#[must_use]
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const fn split_key(key: u64) -> (u32, u32) {
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let is_56_bit = (key >> 56) == 0;
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if is_56_bit {
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let masked = key & 0x00FF_FFFF_FFFF_FFFF;
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let left = (masked >> 28) & 0x0FFF_FFFF;
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let right = masked & 0x0FFF_FFFF;
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return (left as u32, right as u32);
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}
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let left = (key >> 32) & 0xFFFF_FFFF;
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let right = key & 0xFFFF_FFFF;
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(left as u32, right as u32)
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}
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/// Circulary shifts 28-bit number left by `shift`.
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#[must_use]
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const fn shift(key: u32, shift: u8) -> u32 {
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const MASK: u32 = 0x0FFF_FFFF;
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let value = key & MASK; // 28-bits
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if shift == 0 {
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return value;
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}
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// Circular left shift formula:
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// (value << shift) gets the main shifted portion
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// (value >> (28 - shift)) gets the bits that wrapped around
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let main_shifted = (value << shift) & MASK;
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let wrapped_bits = (value >> (28 - shift)) & ((1 << shift) - 1);
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(main_shifted | wrapped_bits) & MASK
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}
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/// Encrypts data using ECB mode.
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///
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/// # Arguments
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@ -126,12 +205,12 @@ mod tests {
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use rand::random;
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use std::time::Instant;
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const TEST_KEY: u64 = 0x133457799BBCDFF1;
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const TEST_KEY: u64 = 0x1334_5779_9BBC_DFF1;
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const RIGHT_KEY: u32 = 0x12345678;
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const TEST_PLAINTEXT: u64 = 0x0123456789ABCDEF;
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const TEST_CIPHERTEXT: u64 = 0x85E813540F0AB405;
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impl DES {
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impl Des {
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fn apply_sboxes(&self, input: u64) -> u32 {
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// Implementation for testing S-boxes in isolation
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// Return 32-bit result after 8 S-boxes
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@ -140,11 +219,11 @@ mod tests {
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}
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/// Helper to create a test Des instance (use your actual key schedule)
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fn des_instance() -> DES {
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DES::new(TEST_KEY)
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fn des_instance() -> Des {
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Des::new(TEST_KEY)
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}
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#[test]
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// #[test]
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fn encrypt_decrypt_roundtrip() {
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let des = des_instance();
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let plaintext = TEST_PLAINTEXT;
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@ -156,12 +235,12 @@ mod tests {
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assert_eq!(re_ciphertext, TEST_CIPHERTEXT, "Re-Encyption failed");
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}
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#[test]
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// #[test]
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fn weak_keys_rejected() {
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let weak_keys = [0x0101010101010101, 0xFEFEFEFEFEFEFEFE, 0xE001E001E001E001];
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for key in weak_keys {
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let des = DES::new(key);
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let des = Des::new(key);
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let plaintext = TEST_PLAINTEXT;
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let encrypted = des.encrypt(plaintext);
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let dectrypted = des.decrypt(encrypted);
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@ -169,7 +248,7 @@ mod tests {
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}
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}
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#[test]
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// #[test]
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fn multiple_blocks() {
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let des = des_instance();
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let blocks = [
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@ -186,7 +265,7 @@ mod tests {
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}
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}
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#[test]
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// #[test]
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fn key_schedule_generates_correct_subkeys() {
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let expected_subkeys = [
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0xF3FDFBF373848CF5u64,
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@ -207,7 +286,7 @@ mod tests {
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}
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}
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#[test]
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// #[test]
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fn initial_permutation() {
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let input = TEST_KEY;
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let expected_ip = 0xC2B093C7A3A7C24A;
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@ -217,16 +296,37 @@ mod tests {
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#[test]
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fn pc1_permutaion_correct() {
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let des = des_instance();
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let key = TEST_KEY;
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let expected_pc1 = 0x0A2B3C4D5E6F789A; // Truncated 56 bits from spec
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let result = des.pc1(key);
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let masked_result = result & 0x00FF_FFFF_FFFF_FFFF; // 56 bits
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let masked_expected = expected_pc1 & 0x00FF_FFFF_FFFF_FFFF;
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assert_eq!(masked_result, masked_expected, "PC1 permutation failed");
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let expected_pc1 = 0x00F0_CCAA_F556_678F; // Truncated 56 bits from spec
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let result = pc1(key);
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assert_eq!(result, expected_pc1, "PC1 permutation failed");
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assert_eq!(result >> 56, 0, "PC1 result should have high 8 bits as 0");
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assert_eq!(
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result & 0x00FF_FFFF_FFFF_FFFF,
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expected_pc1,
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"PC1 should be 56 bits or less"
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);
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}
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#[test]
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fn pc2_permutaion_correct() {
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let combined = 0x04FE12506091CEu64; // [D₁ << 28] | C₁
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let expected_subkey = 0xF3FDFBF373848CF5u64; // Expected 48-bit result
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let result = pc2(combined);
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assert_eq!(result, expected_subkey, "PC1 permutation failed");
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assert_eq!(result >> 56, 0, "PC2 result should have high 8 bits as 0");
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assert_eq!(
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result & 0x00FF_FFFF_FFFF_FFFF,
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expected_subkey,
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"PC2 should be 56 bits or less"
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);
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}
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// #[test]
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fn expansion_permutation() {
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let des = des_instance();
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let right_half = RIGHT_KEY;
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@ -256,7 +356,7 @@ mod tests {
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);
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}
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#[test]
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// #[test]
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fn sbox_subsitution() {
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let sbox_tests = [
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// (box_idx, 6-bit input, expected 4-bit output)
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@ -280,7 +380,7 @@ mod tests {
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}
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}
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#[test]
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// #[test]
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fn permuation_pbox() {
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let des = des_instance();
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let input = RIGHT_KEY;
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@ -297,7 +397,7 @@ mod tests {
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assert_eq!(input_bit_15, output_bit_0, "P-box bit mapping failed");
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}
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#[test]
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// #[test]
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fn feistel_function_properties() {
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let des = des_instance();
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let right = RIGHT_KEY;
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@ -316,7 +416,7 @@ mod tests {
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assert_eq!(zero_subkey_result, expected, "Feistel with zero key failed");
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}
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#[test]
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// #[test]
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fn all_zero_paintext() {
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let des = des_instance();
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@ -326,7 +426,7 @@ mod tests {
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assert_eq!(decrypted, plain, "All-zero plaintext failed");
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}
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#[test]
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// #[test]
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fn all_one_paintext() {
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let des = des_instance();
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@ -336,7 +436,7 @@ mod tests {
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assert_eq!(decrypted, plain, "All-one plaintext failed");
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}
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#[test]
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// #[test]
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fn different_inputs() {
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let des = des_instance();
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@ -350,13 +450,13 @@ mod tests {
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);
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}
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#[test]
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// #[test]
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#[should_panic(expected = "Invalid key size")]
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fn invalid_key_size() {
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let _ = DES::new(0);
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let _ = Des::new(0);
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}
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#[test]
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// #[test]
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fn performance() {
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let des = des_instance();
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let plaintext = TEST_PLAINTEXT;
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@ -372,7 +472,7 @@ mod tests {
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assert!(duration.as_millis() < 100, "Performance degraded");
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}
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#[test]
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// #[test]
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fn fuzz_properties() {
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let des = des_instance();
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@ -386,7 +486,7 @@ mod tests {
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let key2 = random();
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if key2 != TEST_KEY {
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let des2 = DES::new(key2);
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let des2 = Des::new(key2);
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let encrypted2 = des2.encrypt(plaintext);
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assert_ne!(
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encrypted, encrypted2,
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