Struct Hotp 

pub struct Hotp<'a> { /* private fields */ }

Configuration for HMAC-based One-Time Password (HOTP).

Implementations

impl<'a> Hotp<'a>

pub fn new<'s: 'a>( secret: &'s impl AsRef<[u8]>, algorithm: Algorithm, digits: u8, ) -> Result<Self, Error>

Creates a new HOTP configuration.

Arguments

• secret - The raw byte array of the shared secret.
• algorithm - The HMAC hashing algorithm.
• digits - Length of the output token (typically 6 or 8).

Errors

Returns Error::InvalidDigits if digits is 0 or greater than 10.

pub fn secret(&self) -> &'a [u8]

Returns the shared secret.

pub fn algorithm(&self) -> Algorithm

Returns the hashing algorithm.

pub fn digits(&self) -> u8

Returns the number of digits in the output token.

pub fn generate(&self, counter: u64) -> Result<String, Error>

Implements the core HOTP generation algorithm (RFC 4226).

Errors

Returns Error::InvalidSecret if the internal HMAC implementation rejects the secret length.

pub fn verify(&self, code: &str, counter: u64) -> Result<bool, Error>

Verifies a user-provided token against a specific counter.

Errors

Returns Error::InvalidSecret if the internal HMAC implementation rejects the secret length.

Trait Implementations

impl<'a> Clone for Hotp<'a>

fn clone(&self) -> Hotp<'a>

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<'a> Debug for Hotp<'a>

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

Formats the value using the given formatter.