HOTP generates an HOTP (HMAC-Based One-Time Password) value as defined into the RFC4226 Note: if the hash function is nil, defaults to SHA1 Reference: https://datatracker.ietf.org/doc/html/rfc4226.

TOTP generates a TOTP (Time-Based One-Time Password) value as defined into the RFC6238 Note: if the hash function is nil, defaults to SHA1 Reference: https://datatracker.ietf.org/doc/html/rfc6238.

TOTPFromBase32 generates a TOTP (Time-Based One-Time Password) value as defined into the RFC6238 from a base32 encoded secret.