NAME

       oath_hotp_validate - API function

SYNOPSIS

       #include <oath.h>

       int  oath_hotp_validate(const  char  * secret, size_t secret_length, uint64_t start_moving_factor, size_t
       window, const char * otp);

ARGUMENTS

       const char * secret
                   the shared secret string

       size_t secret_length
                   length of secret

       uint64_t start_moving_factor
                   start counter in OTP stream

       size_t window
                   how many OTPs after start counter to test

       const char * otp
                   the OTP to validate.

DESCRIPTION

       Validate an OTP according to OATH HOTP algorithm per RFC 4226.

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

REPORTING BUGS

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

COPYRIGHT

       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.

liboath                                              2.6.11                                oath_hotp_validate(3)