feistel0 encryption and decryption confirmed working

This commit is contained in:
Christoph J. Scherr 2023-05-10 17:55:48 +02:00
parent 4ddf244ee9
commit ad7cdd48b1
Signed by: PlexSheep
GPG Key ID: 25B4ACF7D88186CC
2 changed files with 27 additions and 11 deletions

View File

@ -86,7 +86,7 @@ pub fn inner(input: u16, key: u16, verbose: bool) -> u16 {
}
/// Boilerplate KSA, returns the same given values everytime.
pub fn key_scheduler(key: u32) -> Vec<u16> {
pub fn key_scheduler(_key: u32) -> Vec<u16> {
return vec![0xdead, 0xc0ff, 0xee5a]
}
@ -130,37 +130,45 @@ fn test_decrypt() {
let plaintext = 0xb00b00;
let ciphertext = encrypt(plaintext, keys.clone(), true);
let deciphertext = decrypt(ciphertext, keys.clone(), true);
assert_eq!(ciphertext, deciphertext);
assert_eq!(plaintext, deciphertext);
}
/// decrypt a given plaintext with a given key vec
pub fn decrypt(ciphertext: u32, mut keys: Vec<u16>, verbose: bool) -> u32 {
assert_eq!(keys.len(), ROUNDS as usize);
let mut lef: u16 = ((ciphertext & 0xffff0000) >> 16).try_into().expect("boom");
let mut rig: u16 = ((ciphertext & 0x0000ffff) >> 0).try_into().expect("boom");
if verbose {
println!("input:\n{:08x}\n{:04x}\n {:04x}", ciphertext, lef, rig);
}
// swap lef rig
let mut lef: u16 = ((ciphertext & 0xffff0000) >> 16).try_into().expect("boom");
let mut rig: u16 = ((ciphertext & 0x0000ffff) >> 0).try_into().expect("boom");
let tmp = rig;
rig = lef;
lef = tmp;
let mut ciphertext: u32 = 0;
ciphertext |= (lef as u32) << 16;
ciphertext |= rig as u32;
if verbose {
println!("input:\n{:08x}\n{:04x}\n {:04x}", ciphertext, lef, rig);
}
// reverse keys
keys.reverse();
// do the thing
encrypt(ciphertext, keys, verbose);
ciphertext = encrypt(ciphertext, keys, verbose);
// swap lef rig back
let mut lef: u16 = ((ciphertext & 0xffff0000) >> 16).try_into().expect("boom");
let mut rig: u16 = ((ciphertext & 0x0000ffff) >> 0).try_into().expect("boom");
let tmp = rig;
rig = lef;
lef = tmp;
let mut plaintext: u32 = 0;
plaintext |= (lef as u32) << 16;
plaintext |= rig as u32;
if verbose {
println!("input:\n{:08x}\n{:04x}\n {:04x}", plaintext, lef, rig);
}
if verbose {
println!("returning plaintext:\n{:08x}", plaintext);
}

View File

@ -136,9 +136,11 @@ struct Feistel0SBOXArgs {
#[derive(Args, Clone, Debug, PartialEq, Eq)]
struct Feistel0Args{
#[clap(value_parser=maybe_hex::<u32>)]
plaintext: u32,
input: u32,
#[clap(value_parser=maybe_hex::<u32>)]
key: u32,
#[arg(short, long, default_value_t = false)]
decrypt: bool,
}
/*************************************************************************************************/
@ -215,7 +217,13 @@ pub fn main() {
}
AlgoActions::Feistel0(alg_fe0_args) => {
let keys = algo::feistel0::key_scheduler(alg_fe0_args.key);
let result: u32 = algo::feistel0::encrypt(alg_fe0_args.plaintext, keys, args.verbose);
let result: u32;
if alg_fe0_args.decrypt {
result = algo::feistel0::decrypt(alg_fe0_args.input, keys, args.verbose);
}
else {
result = algo::feistel0::encrypt(alg_fe0_args.input, keys, args.verbose);
}
if args.machine {
println!("{}", result)
}