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/*
* OTP Utilities
* Copyright (C) 2020 David M. Syzdek <david@syzdek.net>.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of David M. Syzdek nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL DAVID M SYZDEK BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* @file include/otputil.h
*/
#ifndef __OTPUTIL_H
#define __OTPUTIL_H 1
///////////////
// //
// Headers //
// //
///////////////
#pragma mark - Headers
#include <stddef.h>
#include <inttypes.h>
#include <sys/types.h>
#include <stdio.h>
#include <regex.h>
//////////////
// //
// Macros //
// //
//////////////
#pragma mark - Macros
// Exports function type
#undef OTPUTIL_C_DECLS
#undef OTPUTIL_BEGIN_C_DECLS
#undef OTPUTIL_END_C_DECLS
#undef _OTPUTIL_I
#undef _OTPUTIL_F
#undef _OTPUTIL_V
#if defined(__cplusplus) || defined(c_plusplus)
# define _OTPUTIL_I extern "C" inline
# define OTPUTIL_C_DECLS "C" ///< exports as C functions
# define OTPUTIL_BEGIN_C_DECLS extern "C" { ///< exports as C functions
# define OTPUTIL_END_C_DECLS } ///< exports as C functions
#else
# define _OTPUTIL_I inline
# define OTPUTIL_C_DECLS /* empty */ ///< exports as C functions
# define OTPUTIL_BEGIN_C_DECLS /* empty */ ///< exports as C functions
# define OTPUTIL_END_C_DECLS /* empty */ ///< exports as C functions
#endif
#ifdef WIN32
# ifdef _LIB_LIBOTPUTIL_H
# define _OTPUTIL_F extern OTPUTIL_C_DECLS __declspec(dllexport) ///< used for library calls
# define _OTPUTIL_V extern OTPUTIL_C_DECLS __declspec(dllexport) ///< used for library calls
# else
# define _OTPUTIL_F extern OTPUTIL_C_DECLS __declspec(dllimport) ///< used for library calls
# define _OTPUTIL_V extern OTPUTIL_C_DECLS __declspec(dllimport) ///< used for library calls
# endif
#else
# ifdef _LIB_LIBOTPUTIL_H
# define _OTPUTIL_F /* empty */ ///< used for library calls
# define _OTPUTIL_V extern OTPUTIL_C_DECLS ///< used for library calls
# else
# define _OTPUTIL_F extern OTPUTIL_C_DECLS ///< used for library calls
# define _OTPUTIL_V extern OTPUTIL_C_DECLS ///< used for library calls
# endif
#endif
///////////////////
// //
// Definitions //
// //
///////////////////
#pragma mark - Definitions
#define OTPUTIL_SUCCESS 0x0000 ///< operation was successful
#define OTPUTIL_ENOTSUP 0x0001 ///< methd or feature not supported
#define OTPUTIL_EBADDATA 0x0002 ///< invalid data
#define OTPUTIL_ENOBUFS 0x0003 ///< no buffer space available
#define OTPUTIL_ENOMEM 0x0004 ///< out of virtual memory
#define OTPUTIL_EOPTION 0x0005 ///< invalid options
#define OTPUTIL_EOPTVAL 0x0006 ///< invalid option value
#define OTPUTIL_OPT_SECRET 0x0000
#define OTPUTIL_OPT_K 0x0001
#define OTPUTIL_OPT_KSTR 0x0002
#define OTPUTIL_OPT_TOTP_T0 0x0003
#define OTPUTIL_OPT_TOTP_X 0x0004
#define OTPUTIL_OPT_TOTP_TIME 0x0005 // current UNIX time
#define OTPUTIL_OPT_HOTP_C 0x0006
#define OTPUTIL_OPT_DESC 0x0007
// 0x0008
#define OTPUTIL_OPT_METHOD 0x0009
#define OTPUTIL_OPT_HOTP_DIGITS 0x000a
#define OTPUTIL_OPT_TOTP_DIGITS 0x000b
#define OTPUTIL_OPT_DIGITS 0x000c
#define OTPUTIL_METH_RFC4226 0x0001
#define OTPUTIL_METH_RFC6238 0x0002
#define OTPUTIL_METH_HOTP OTPUTIL_METH_RFC4226
#define OTPUTIL_METH_TOTP OTPUTIL_METH_RFC6238
#define OTPUTIL_DFLT_METH OTPUTIL_METH_TOTP
#define OTPUTIL_DFLT_HOTP_C 1ULL
#define OTPUTIL_DFLT_HOTP_DIGITS 6
#define OTPUTIL_DFLT_TOTP_T0 0ULL
#define OTPUTIL_DFLT_TOTP_X 30ULL
#define OTPUTIL_DFLT_TOTP_TIME 0ULL // current UNIX time
#define OTPUTIL_DFLT_TOTP_DIGITS 6
#define OTPUTIL_MAX_CODE_SIZE 16
/////////////////
// //
// Datatypes //
// //
/////////////////
#pragma mark - Datatypes
typedef struct _otputil_secret otputil_t;
typedef struct _otputil_berval otputil_bv_t;
struct _otputil_berval
{
size_t bv_len;
void * bv_val;
};
//////////////////
// //
// Prototypes //
// //
//////////////////
#pragma mark - Prototypes
OTPUTIL_BEGIN_C_DECLS
//----------------//
// BER prototypes //
//----------------//
#pragma mark BER prototypes
_OTPUTIL_F otputil_bv_t *
otputil_base32bv(
const char * str );
_OTPUTIL_F otputil_bv_t *
otputil_bvalloc(
const void * val,
size_t len );
_OTPUTIL_F char *
otputil_bvbase32(
const otputil_bv_t * bv );
_OTPUTIL_F otputil_bv_t *
otputil_bvdup(
const otputil_bv_t * bv );
_OTPUTIL_F void
otputil_bvfree(
otputil_bv_t * bv );
//------------------//
// error prototypes //
//------------------//
#pragma mark error prototypes
_OTPUTIL_F const char *
otputil_err2string(
int err );
//-------------------//
// memory prototypes //
//-------------------//
#pragma mark memory prototypes
_OTPUTIL_F void
otputil_free(
otputil_t * tud );
_OTPUTIL_F int
otputil_get_param(
otputil_t * tud,
int option,
void * outvalue );
_OTPUTIL_F int
otputil_initialize(
otputil_t ** tudp );
_OTPUTIL_F int
otputil_set_param(
otputil_t * tud,
int option,
const void * invalue );
//----------------//
// misc functions //
//----------------//
#pragma mark misc functions
char *
otputil_getpass(
const char * prompt,
char * pass,
size_t passlen );
//---------------//
// OTP functions //
//---------------//
#pragma mark OTP functions
_OTPUTIL_F int
otputil_code(
otputil_t * tud );
_OTPUTIL_F char *
otputil_str(
otputil_t * tud,
char * dst,
size_t dstlen );
//---------------//
// HOTP functions //
//---------------//
#pragma mark HOTP functions
_OTPUTIL_F int
otputil_hotp_code(
const otputil_bv_t * hotp_k,
uint64_t hotp_c,
int hotp_digits );
_OTPUTIL_F char *
otputil_hotp_str(
const otputil_bv_t * hotp_k,
uint64_t hotp_c,
int hotp_digits,
char * dst,
size_t dstlen );
//---------------//
// TOTP functions //
//---------------//
#pragma mark TOTP functions
_OTPUTIL_F int
otputil_totp_code(
const otputil_bv_t * totp_k,
uint64_t totp_t0,
uint64_t totp_tx,
uint64_t totp_time,
int totp_digits );
_OTPUTIL_F char *
otputil_totp_str(
const otputil_bv_t * totp_k,
uint64_t totp_t0,
uint64_t totp_tx,
uint64_t totp_time,
int totp_digits,
char * dst,
size_t dstlen );
_OTPUTIL_F uint64_t
otputil_totp_timer(
otputil_t * tud,
uint64_t totp_time );
OTPUTIL_END_C_DECLS
#endif /* end of header file */
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