Struct Nihilist 

pub struct Nihilist { /* private fields */ }

Nihilist cipher combining straddling checkerboard and transposition.

This cipher performs a two-stage encryption:

1. Converts plaintext to digits using a straddling checkerboard
2. Applies columnar transposition to the resulting digits

The decryption process reverses these steps in opposite order.

Implementations

impl Nihilist

pub fn new(key1: &str, key2: &str, chrs: &str) -> Result<Self>

Creates a new Nihilist cipher with the specified keys.

Arguments

• key1 - The key for the straddling checkerboard (e.g., “ARABESQUE”)
• key2 - The key for the transposition cipher (e.g., “SUBWAY”)
• chrs - Two characters defining the blank positions in the checkerboard (e.g., “37”)

Returns

Returns Ok(Nihilist) if both keys are valid, or Err(String) with an error message if either key is invalid or empty.

Examples

use old_crypto_rs::Nihilist;

let cipher = Nihilist::new("ARABESQUE", "SUBWAY", "37").unwrap();

Errors

Returns an error if:

• key1 is empty or invalid for the straddling checkerboard
• key2 is empty or invalid for the transposition cipher
• chrs is not exactly two characters or contains invalid positions

Trait Implementations

impl Block for Nihilist

fn block_size(&self) -> usize

Returns the block size of the cipher.

The block size is determined by the transposition cipher’s key length.

Returns

The number of characters that can be processed in one block.

fn encrypt(&self, dst: &mut [u8], src: &[u8]) -> usize

Encrypts the source data into the destination buffer.

The encryption process:

1. Converts plaintext to digits using the straddling checkerboard
2. Applies columnar transposition to the resulting digits

Arguments

• dst - Destination buffer for the ciphertext (must be large enough)
• src - Source plaintext to encrypt

Returns

The number of bytes written to dst.

fn decrypt(&self, dst: &mut [u8], src: &[u8]) -> usize

Decrypts the source ciphertext into the destination buffer.

The decryption process:

1. Reverses the columnar transposition
2. Converts the resulting digits back to plaintext using the straddling checkerboard

Arguments

• dst - Destination buffer for the plaintext (must be large enough)
• src - Source ciphertext to decrypt

Returns

The number of bytes written to dst.