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/*
* ProFTPD - mod_auth_otp
* Copyright (c) 2015 TJ Saunders
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA.
*
* As a special exemption, TJ Saunders and other respective copyright holders
* give permission to link this program with OpenSSL, and distribute the
* resulting executable, without including the source code for OpenSSL in the
* source distribution.
*/
#ifndef MOD_AUTH_OTP_OTP_H
#define MOD_AUTH_OTP_OTP_H
#include "mod_auth_otp.h"
/* Following the recommendation of RFC 6238, Section 5.2 */
#define AUTH_OTP_TOTP_TIMESTEP_SECS 30
/* Generate an OTP using the algorithm specified in RFC 4226 (HOTP). */
int auth_otp_hotp(pool *p, const unsigned char *key, size_t key_len,
unsigned long counter, unsigned int *code);
/* Generate an OTP using the algorithm specified in RFC 6238 (TOTP).
*
* Note that RFC 6238 defines support using SHA1, SHA256, or SHA512;
* the algo argument here indicates which one to use.
*/
int auth_otp_totp(pool *p, const unsigned char *key, size_t key_len,
unsigned long ts, unsigned int algo, unsigned int *code);
#endif /* MOD_AUTH_OTP_OTP_H */
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