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/**
* libpassphrase – Personalisable library for TTY passphrase reading
*
* Copyright © 2013, 2014 Mattias Andrée (maandree@member.fsf.org)
*
* 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
/**
* Reads the passphrase from stdin
*
* @return The passphrase, should be wiped `free`:ed, `NULL` on error
*/
extern char* passphrase_read(void);
/**
* Forcable write NUL characters to a passphrase
*
* @param ptr The password to wipe
* @param n The number of characters to wipe
*/
extern void passphrase_wipe(volatile char* ptr, size_t n) __attribute__((optimize("-O0")));
/**
* Disable echoing and do anything else to the terminal settnings `passphrase_read` requires
*/
extern void passphrase_disable_echo(void);
/**
* Undo the actions of `passphrase_disable_echo`
*/
extern void passphrase_reenable_echo(void);
#endif
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