Quick Navigator

Search Site

Unix VPS
A - Starter
B - Basic
C - Preferred
D - Commercial
MPS - Dedicated
Previous VPSs
* Sign Up! *

Contact Us
Online Help
Domain Status
Man Pages

Virtual Servers

Topology Map

Server Agreement
Year 2038

USA Flag



Man Pages
oath_totp_validate4(3) liboath oath_totp_validate4(3)

oath_totp_validate4 - API function

#include <oath.h>

int oath_totp_validate4(const char * secret, size_t secret_length, time_t now, unsigned time_step_size, time_t start_offset, size_t window, int * otp_pos, uint64_t * otp_counter, int flags, const char * otp);

const char * secret
the shared secret string
size_t secret_length
length of secret
time_t now
Unix time value to validate TOTP for
unsigned time_step_size
time step system parameter (typically 30)
time_t start_offset
Unix time of when to start counting time steps (typically 0)
size_t window
how many OTPs after/before start OTP to test
int * otp_pos
output search position in search window (may be NULL).
uint64_t * otp_counter
counter value used to calculate OTP value (may be NULL).
int flags
flags indicating mode, one of oath_totp_flags
const char * otp
the OTP to validate.

Validate an OTP according to OATH TOTP algorithm per RFC 6238.

Currently only OTP lengths of 6, 7 or 8 digits are supported. This restrictions may be lifted in future versions, although some limitations are inherent in the protocol.

The flags parameter may be used to change the MAC function, for example OATH_TOTP_HMAC_SHA256 or OATH_TOTP_HMAC_SHA512.

Returns absolute value of position in OTP window (zero is first position), or OATH_INVALID_OTP if no OTP was found in OTP window, or an error code.


Report bugs to <>. liboath home page: General help using GNU software:

Copyright © 2009-2020 Simon Josefsson.
Copying and distribution of this file, with or without modification, are permitted in any medium without royalty provided the copyright notice and this notice are preserved.
2.6.7 liboath

Search for    or go to Top of page |  Section 3 |  Main Index

Powered by GSP Visit the GSP FreeBSD Man Page Interface.
Output converted with ManDoc.