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/*
* Copyright (c) 2024 Vaughn Nugent
*
* Package: noscrypt
* File: providers/monocypher.c
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1
* of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with noscrypt. If not, see http://www.gnu.org/licenses/.
*/
/*
* This file handles some fallbacks that may not be available on
* some platforms. More specifically:
* - Secure memset 0
* - Chacha20 cipher
*
*/
#ifdef NC_ENABLE_MONOCYPHER
#include <monocypher.h>
/* Export secure memse0 */
#ifndef _IMPL_SECURE_ZERO_MEMSET
/* export cytpo wipe function as is */
#define _IMPL_SECURE_ZERO_MEMSET crypto_wipe
#endif
/* Export Chacha20 */
#ifndef _IMPL_CHACHA20_CRYPT
#define _IMPL_CHACHA20_CRYPT _mc_chacha20_crypt
_IMPLSTB cstatus_t _mc_chacha20_crypt(
const uint8_t* key,
const uint8_t* nonce,
const uint8_t* input,
uint8_t* output,
uint32_t dataLen
)
{
_overflow_check(dataLen)
/*
* Function returns the next counter value which is not
* needed for noscrypt as encryptions are one-shot, and
* require a new nonce for each encryption.
*
* ITEF function uses a 12byte nonce which is required for
* nip-44 compliant encryption.
*/
crypto_chacha20_ietf(
output,
input,
(size_t)dataLen,
key,
nonce,
0x00 /* Counter always starts at 0 */
);
return CSTATUS_OK;
}
#endif
#endif /* !NC_ENABLE_MONOCYPHER */
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