Function feistel_network_decrypt 

pub fn feistel_network_decrypt(
    input: &[u8],
    key: u128,
    rounds: u32,
) -> Result<Vec<u8>, &'static str>

Decrypts an array of bytes using the feistel cipher

Arguments

• input - The array of bytes to decrypt
• key - The key to use for decryption
• rounds - The number of rounds to use for decryption

Returns

A Result containing the decrypted data on success, or an error message on failure.

Errors

• Input must not be empty - If the input array is empty
• Input length must be a multiple of 2 - If the input length is not a multiple of 2
• Number of rounds must be greater than 0 - If the number of rounds is less than 1
• HMAC creation failed - If there is an error in creating the HMAC for the round function in the Key Derivation Function

Example

use cryptographic_primitives::{feistel_network_encrypt, feistel_network_decrypt};
 
let plaintext = b"Hello, world!";
let ciphertext = feistel_network_encrypt(plaintext, 15, 5).unwrap();
let decrypted = feistel_network_decrypt(&ciphertext, 15, 5).unwrap();
 
assert_eq!(decrypted, plaintext.to_vec());