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/* toxencryptsave.h
*
* The Tox encrypted save functions.
*
* Copyright (C) 2013 Tox project All Rights Reserved.
*
* This file is part of Tox.
*
* Tox 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.
*
* Tox 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 Tox. If not, see <http://www.gnu.org/licenses/>.
*
*/
#ifndef TOXENCRYPTSAVE_H
#define TOXENCRYPTSAVE_H
#ifdef __cplusplus
extern "C" {
#endif
#include <stdint.h>
#ifndef __TOX_DEFINED__
#define __TOX_DEFINED__
typedef struct Tox Tox;
#endif
#define TOX_PASS_ENCRYPTION_EXTRA_LENGTH (crypto_box_MACBYTES + crypto_box_NONCEBYTES \
+ crypto_pwhash_scryptsalsa208sha256_SALTBYTES)
#define TOX_PASS_KEY_LENGTH (crypto_box_KEYBYTES + crypto_pwhash_scryptsalsa208sha256_SALTBYTES)
/* This "module" provides functions analogous to tox_load and tox_save in toxcore
* Clients should consider alerting their users that, unlike plain data, if even one bit
* becomes corrupted, the data will be entirely unrecoverable.
* Ditto if they forget their password, there is no way to recover the data.
*/
/* return size of the messenger data (for encrypted saving). */
uint32_t tox_encrypted_size(const Tox *tox);
/* Generates a secret symmetric key from the given passphrase. out_key must be at least
* TOX_PASS_KEY_LENGTH bytes long.
* Be sure to not compromise the key! Only keep it in memory, do not write to disk.
* This function is fairly cheap, but irungentoo insists that you be allowed to
* cache the result if you want, to minimize computation for repeated encryptions.
* The password is zeroed after key derivation.
* The key should only be used with the other functions in this module, as it
* includes a salt.
*
* returns 0 on success
* returns -1 on failure
*/
int tox_derive_key_from_pass(uint8_t *passphrase, uint32_t pplength, uint8_t *out_key);
/* Encrypt arbitrary with a key produced by tox_derive_key_from_pass. The output
* array must be at least data_len + TOX_PASS_ENCRYPTION_EXTRA_LENGTH bytes long.
* key must be TOX_PASS_KEY_LENGTH bytes.
* If you already have a symmetric key from somewhere besides this module, simply
* call encrypt_data_symmetric in toxcore/crypto_core directly.
*
*
* returns 0 on success
* returns -1 on failure
*/
int tox_pass_key_encrypt(uint8_t *data, uint32_t data_len, const uint8_t *key, uint8_t *out);
/* Encrypts the given data with the given passphrase. The output array must be
* at least data_len + TOX_PASS_ENCRYPTION_EXTRA_LENGTH bytes long. This delegates
* to tox_derive_key_from_pass and tox_pass_key_encrypt.
*
* tox_encrypted_save() is a good example of how to use this function.
*
* returns 0 on success
* returns -1 on failure
*/
int tox_pass_encrypt(uint8_t *data, uint32_t data_len, uint8_t *passphrase, uint32_t pplength, uint8_t *out);
/* Save the messenger data encrypted with the given password.
* data must be at least tox_encrypted_size().
*
* returns 0 on success
* returns -1 on failure
*/
int tox_encrypted_save(const Tox *tox, uint8_t *data, uint8_t *passphrase, uint32_t pplength);
/* This is the inverse of tox_pass_key_encrypt, also using only keys produced by
* tox_derive_key_from_pass.
*
* returns the length of the output data (== data_len - TOX_PASS_ENCRYPTION_EXTRA_LENGTH) on success
* returns -1 on failure
*/
int tox_pass_key_decrypt(const uint8_t* data, uint32_t length, const uint8_t* key, uint8_t* out);
/* Decrypts the given data with the given passphrase. The output array must be
* at least data_len - TOX_PASS_ENCRYPTION_EXTRA_LENGTH bytes long. This delegates
* to tox_pass_key_decrypt.
*
* tox_encrypted_load() is a good example of how to use this function.
*
* returns the length of the output data (== data_len - TOX_PASS_ENCRYPTION_EXTRA_LENGTH) on success
* returns -1 on failure
*/
int tox_pass_decrypt(const uint8_t *data, uint32_t length, uint8_t *passphrase, uint32_t pplength, uint8_t *out);
/* Load the messenger from encrypted data of size length.
*
* returns 0 on success
* returns -1 on failure
*/
int tox_encrypted_load(Tox *tox, const uint8_t *data, uint32_t length, uint8_t *passphrase, uint32_t pplength);
/* Determines whether or not the given data is encrypted (by checking the magic number)
*
* returns 1 if it is encrypted
* returns 0 otherwise
*/
int tox_is_save_encrypted(const uint8_t *data);
#ifdef __cplusplus
}
#endif
#endif
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