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/**
* libpassphrase – Personalisable library for TTY passphrase reading
*
* Copyright © 2013, 2014, 2015 Mattias Andrée (m@maandree.se)
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*/
#ifndef PASSPHRASE_H
#define PASSPHRASE_H
#include <stddef.h>
#if defined(__GNUC__) && !defined(PASSPHRASE_USE_DEPRECATED)
# define PASSPHRASE_DEPRECATED(MSG) __attribute__((__deprecated__(MSG)))
#else
# define PASSPHRASE_DEPRECATED(MSG) /* ignore */
#endif
/**
* `passphrase_read2` shall not do any thing
* special, just accept the passphrase. This should
* be used when getting authentication.
* Should not be combined with `PASSPHRASE_READ_NEW`.
*/
#define PASSPHRASE_READ_EXISTING 0
/**
* `passphrase_read2` shall draw a pasphrase
* strength meter if such capability is
* available. This should be used when create
* a new passphrase.
* Should not be combined with `PASSPHRASE_READ_EXISTING`.
*/
#define PASSPHRASE_READ_NEW 1
/**
* `passphrase_read2` may do as it please with the
* the screen. This is only used if combined with
* `PASSPHRASE_READ_NEW` and not with
* `PASSPHRASE_READ_BELOW_FREE`. `passphrase_read2`
* will create make a line below the new current
* line and use that line to draw the passphrase
* strength meter if such capability is available.
*/
#define PASSPHRASE_READ_SCREEN_FREE 2
/**
* `passphrase_read2` may do as it please with the
* line below the current line. This is only used
* if combined with `PASSPHRASE_READ_NEW`.
* `passphrase_read2` will draw the passphrase
* strength meter on the line below if such
* capability is available.
*/
#define PASSPHRASE_READ_BELOW_FREE 4
/**
* Reads the passphrase from stdin
*
* @return The passphrase, should be wiped and `free`:ed, `NULL` on error
*/
PASSPHRASE_DEPRECATED("Please use 'passphrase_read2' instead.")
char* passphrase_read(void);
/**
* Reads the passphrase
*
* @param fdin File descriptor for input
* @param flags Settings, a combination of the constants:
* * PASSPHRASE_READ_EXISTING
* * PASSPHRASE_READ_NEW
* * PASSPHRASE_READ_SCREEN_FREE
* * PASSPHRASE_READ_BELOW_FREE
* Invalid input is ignored, to make use the
* application will work.
* @return The passphrase, should be wiped and `free`:ed, `NULL` on error
*/
char* passphrase_read2(int, int);
/**
* Forcefully write NUL characters to a passphrase
*
* @param ptr The password to wipe
* @param n The number of characters to wipe
*/
void passphrase_wipe(char*, size_t);
/**
* Forcefully write NUL characters to a passphrase
*
* @param ptr The password to wipe
*/
void passphrase_wipe1(char*);
/**
* Disable echoing and do anything else to the terminal settnings `passphrase_read` requires
*/
PASSPHRASE_DEPRECATED("Please use 'passphrase_disable_echo1' instead.")
void passphrase_disable_echo(void);
/**
* Undo the actions of `passphrase_disable_echo`
*/
PASSPHRASE_DEPRECATED("Please use 'passphrase_reenable_echo1' instead.")
void passphrase_reenable_echo(void);
/**
* Disable echoing and do anything else to the terminal settnings `passphrase_read2` requires
*
* @param fdin File descriptor for input
*/
void passphrase_disable_echo1(int);
/**
* Undo the actions of `passphrase_disable_echo1`
*
* @param fdin File descriptor for input
*/
void passphrase_reenable_echo1(int);
#undef PASSPHRASE_DEPRECATED
#endif
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