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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 re-
       strictions 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_IN-
       VALID_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 (C) 2009-2020 Simon Josefsson.
       Copying and distribution	of this	file, with  or	without	 modification,
       are  permitted in any medium without royalty provided the copyright no-
       tice and	this notice are	preserved.

liboath				     2.6.9		 oath_hotp_validate(3)

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