Struct VigenereCipher 

pub struct VigenereCipher { /* private fields */ }

A Vigenere cipher implementation.

This cipher uses a keyword to perform a series of Caesar ciphers on the plaintext. It is a classic example of a polyalphabetic substitution cipher.

Implementations

impl VigenereCipher

pub fn new(key: &str) -> Self

Creates a new Vigenere cipher with the given key string.

Non-alphabetic characters in the key are ignored. The key is converted to uppercase before processing.

Arguments

• key - The string used to derive the shift values.

Trait Implementations

impl Block for VigenereCipher

fn block_size(&self) -> usize

Returns the length of the Vigenere key.

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

Encrypts source bytes into destination buffer using the Vigenere cipher.

This method maps source characters ‘A’-‘Z’ to values 0-25, applies the Vigenere shift from the key, and then maps the result back to uppercase letters. Non-alphabetic characters are currently handled by applying the shift to their raw ASCII value, though most usage expects only ‘A’-‘Z’ input.

Arguments

• dst - The destination buffer for the encrypted bytes.
• src - The source plaintext bytes to encrypt.

Returns

Returns the number of bytes written to dst.

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

Decrypts source bytes into destination buffer using the Vigenere cipher.

This method reverses the Vigenere shift by subtracting the key values from the ciphertext values modulo 26.

Arguments

• dst - The destination buffer for the decrypted bytes.
• src - The source ciphertext bytes to decrypt.

Returns

Returns the number of bytes written to dst.

impl Debug for VigenereCipher

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.