oath_hotp_generate (3) - Linux Manuals
oath_hotp_generate: API function
NAMEoath_hotp_generate - API function
- const char * secret
- the shared secret string
- size_t secret_length
- length of secret
- uint64_t moving_factor
- a counter indicating the current OTP to generate
- unsigned digits
- number of requested digits in the OTP, excluding checksum
- bool add_checksum
- whether to add a checksum digit or not
- size_t truncation_offset
- use a specific truncation offset
- char * output_otp
- output buffer, must have room for the output OTP plus zero
DESCRIPTIONGenerate a one-time-password using the HOTP algorithm as described in RFC 4226.
Use a value of OATH_HOTP_DYNAMIC_TRUNCATION for truncation_offset unless you really need a specific truncation offset.
To find out the size of the OTP you may use the OATH_HOTP_LENGTH() macro. The output_otp buffer must be have room for that length plus one for the terminating NUL.
Currently only values 6, 7 and 8 for digits are supported, and the add_checksum value is ignored. These restrictions may be lifted in future versions, although some limitations are inherent in the protocol.
RETURNSOn success, OATH_OK (zero) is returned, otherwise an error code is returned.
REPORTING BUGSReport bugs to <oath-toolkit-help [at] nongnu.org>. liboath home page: http://www.gnu.org/software/liboath/ General help using GNU software: http://www.gnu.org/gethelp/
COPYRIGHTCopyright © 2009-2012 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.