chacha.h
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1 /**
2  * @file chacha.h
3  * @brief ChaCha encryption algorithm
4  *
5  * @section License
6  *
7  * SPDX-License-Identifier: GPL-2.0-or-later
8  *
9  * Copyright (C) 2010-2019 Oryx Embedded SARL. All rights reserved.
10  *
11  * This file is part of CycloneCrypto Open.
12  *
13  * This program is free software; you can redistribute it and/or
14  * modify it under the terms of the GNU General Public License
15  * as published by the Free Software Foundation; either version 2
16  * of the License, or (at your option) any later version.
17  *
18  * This program is distributed in the hope that it will be useful,
19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21  * GNU General Public License for more details.
22  *
23  * You should have received a copy of the GNU General Public License
24  * along with this program; if not, write to the Free Software Foundation,
25  * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
26  *
27  * @author Oryx Embedded SARL (www.oryx-embedded.com)
28  * @version 1.9.6
29  **/
30 
31 #ifndef _CHACHA_H
32 #define _CHACHA_H
33 
34 //Dependencies
35 #include "core/crypto.h"
36 
37 //C++ guard
38 #ifdef __cplusplus
39 extern "C" {
40 #endif
41 
42 
43 /**
44  * @brief ChaCha algorithm context
45  **/
46 
47 typedef struct
48 {
50  uint32_t state[16];
51  uint32_t block[16];
52  size_t pos;
54 
55 
56 //ChaCha related functions
57 error_t chachaInit(ChachaContext *context, uint_t nr, const uint8_t *key,
58  size_t keyLen, const uint8_t *nonce, size_t nonceLen);
59 
60 void chachaCipher(ChachaContext *context, const uint8_t *input,
61  uint8_t *output, size_t length);
62 
63 void chachaProcessBlock(ChachaContext *context);
64 
65 //C++ guard
66 #ifdef __cplusplus
67 }
68 #endif
69 
70 #endif
uint16_t block
Definition: tftp_common.h:113
uint8_t length
Definition: dtls_misc.h:149
void chachaCipher(ChachaContext *context, const uint8_t *input, uint8_t *output, size_t length)
Encrypt/decrypt data with the ChaCha algorithm.
Definition: chacha.c:183
size_t pos
Definition: chacha.h:52
uint_t nr
Definition: chacha.h:49
error_t
Error codes.
Definition: error.h:42
General definitions for cryptographic algorithms.
ChaCha algorithm context.
Definition: chacha.h:47
unsigned int uint_t
Definition: compiler_port.h:45
error_t chachaInit(ChachaContext *context, uint_t nr, const uint8_t *key, size_t keyLen, const uint8_t *nonce, size_t nonceLen)
Initialize ChaCha context using the supplied key and nonce.
Definition: chacha.c:70
void chachaProcessBlock(ChachaContext *context)
Generate a keystream block.
Definition: chacha.c:260