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oath_totp_validate(3)               liboath              oath_totp_validate(3)

NAME
       oath_totp_validate - API function

SYNOPSIS
       #include <oath.h>

       int oath_totp_validate(const char * secret, size_t secret_length,
       time_t now, unsigned time_step_size, time_t start_offset, size_t
       window, const char * otp);

ARGUMENTS
       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

       const char * otp
                   the OTP to validate.

DESCRIPTION
       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.

RETURNS
       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.

SINCE
       1.6.0

REPORTING BUGS
       Report bugs to <oath-toolkit-help@nongnu.org>.  liboath home page:
       http://www.gnu.org/software/liboath/ General help using GNU software:
       http://www.gnu.org/gethelp/

COPYRIGHT
       Copyright (C) 2009-2015 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.

liboath                              2.6.1               oath_totp_validate(3)