4. TOTP

TOTP

Config

val config = TOTPConfig("secret", "KOTP-LIB", digits = 6, interval = 30, digest = Digest.SHA1)
// or
val config = TOTPConfig(Base32.encode("secret"), "KOTP-LIB", digits = 6, interval = 30, digest = Digest.SHA1)
// or
val config = TOTPConfig("secret", "KOTP-LIB")
// or
val config = TOTPConfig(Base32.encode("secret"), "KOTP-LIB")

TOTP

val totp = TOTP(config)

Otp generation

val time = Calendar.getInstance().apply { timeInMillis = 1_234_567_890 }.time

totp.at(time)                      // 515493
totp.now()                         // 351991

Verification

totp.verify("515493", at = time)   // 1234560 => verified
totp.verify("000000", at = time)   // null    => not verified

Provisioning Uri

totp.provisioningUri("KOTP")       // otpauth://totp/KOTP-LIB:KOTP?secret=ONSWG4TFOQ&period=30&issuer=KOTP-LIB&digits=6&algorithm=SHA1