Function libotp::hotp

pub fn hotp(counter: u64, secret: &str, digits: u32) -> Option<u32>

HMAC One Time Password function

Arguments

• counter - A 64-bit counter for HOTP
• secret - A base32 encoded secret
• digits - Desired OTP length in digits. 6+ is recommended.

Notes

This function converts the counter to it's 64 bit little endian representation. If you have other requirements, please use the HOTP struct directly.