1oath_totp_validate(3)               liboath              oath_totp_validate(3)
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NAME

6       oath_totp_validate - API function
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SYNOPSIS

9       #include <oath.h>
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11       int  oath_totp_validate(const  char  *  secret,  size_t  secret_length,
12       time_t now, unsigned time_step_size, time_t start_offset,  size_t  win‐
13       dow, const char * otp);
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ARGUMENTS

16       const char * secret
17                   the shared secret string
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19       size_t secret_length
20                   length of secret
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22       time_t now  Unix time value to validate TOTP for
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24       unsigned time_step_size
25                   time step system parameter (typically 30)
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27       time_t start_offset
28                   Unix  time  of when to start counting time steps (typically
29                   0)
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31       size_t window
32                   how many OTPs after/before start OTP to test
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34       const char * otp
35                   the OTP to validate.
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DESCRIPTION

38       Validate an OTP according to OATH TOTP algorithm per RFC 6238.
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40       Currently only OTP lengths of 6, 7 or 8  digits  are  supported.   This
41       restrictions  may  be  lifted in future versions, although some limita‐
42       tions are inherent in the protocol.
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RETURNS

45       Returns absolute value of position in OTP window (zero is  first  posi‐
46       tion),  or  OATH_INVALID_OTP  if  no OTP was found in OTP window, or an
47       error code.
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SINCE

50       1.6.0
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REPORTING BUGS

53       Report bugs  to  <oath-toolkit-help@nongnu.org>.   liboath  home  page:
54       http://www.gnu.org/software/liboath/  General  help using GNU software:
55       http://www.gnu.org/gethelp/
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58       Copyright © 2009-2020 Simon Josefsson.
59       Copying and distribution of this file, with  or  without  modification,
60       are  permitted  in  any  medium  without royalty provided the copyright
61       notice and this notice are preserved.
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65liboath                              2.6.6               oath_totp_validate(3)
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