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oath_hotp_validate(3)               liboath              oath_hotp_validate(3)

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:
       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_hotp_validate(3)