chacha.h
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1 /**
2  * @file chacha.h
3  * @brief ChaCha encryption algorithm
4  *
5  * @section License
6  *
7  * Copyright (C) 2010-2018 Oryx Embedded SARL. All rights reserved.
8  *
9  * This file is part of CycloneCrypto Open.
10  *
11  * This program is free software; you can redistribute it and/or
12  * modify it under the terms of the GNU General Public License
13  * as published by the Free Software Foundation; either version 2
14  * of the License, or (at your option) any later version.
15  *
16  * This program is distributed in the hope that it will be useful,
17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19  * GNU General Public License for more details.
20  *
21  * You should have received a copy of the GNU General Public License
22  * along with this program; if not, write to the Free Software Foundation,
23  * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
24  *
25  * @author Oryx Embedded SARL (www.oryx-embedded.com)
26  * @version 1.9.0
27  **/
28 
29 #ifndef _CHACHA_H
30 #define _CHACHA_H
31 
32 //Dependencies
33 #include "core/crypto.h"
34 
35 //C++ guard
36 #ifdef __cplusplus
37  extern "C" {
38 #endif
39 
40 
41 /**
42  * @brief ChaCha algorithm context
43  **/
44 
45 typedef struct
46 {
48  uint32_t state[16];
49  uint32_t block[16];
50  size_t pos;
52 
53 
54 //ChaCha related functions
55 error_t chachaInit(ChachaContext *context, uint_t nr, const uint8_t *key,
56  size_t keyLen, const uint8_t *nonce, size_t nonceLen);
57 
58 void chachaCipher(ChachaContext *context, const uint8_t *input,
59  uint8_t *output, size_t length);
60 
61 void chachaProcessBlock(ChachaContext *context);
62 
63 //C++ guard
64 #ifdef __cplusplus
65  }
66 #endif
67 
68 #endif
General definitions for cryptographic algorithms.
void chachaProcessBlock(ChachaContext *context)
Generate a keystream block.
Definition: chacha.c:254
size_t pos
Definition: chacha.h:50
uint_t nr
Definition: chacha.h:47
void chachaCipher(ChachaContext *context, const uint8_t *input, uint8_t *output, size_t length)
Encrypt/decrypt data with the ChaCha algorithm.
Definition: chacha.c:177
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:68
error_t
Error codes.
Definition: error.h:40
unsigned int uint_t
Definition: compiler_port.h:43
ChaCha algorithm context.
Definition: chacha.h:45
uint16_t block
Definition: tftp_common.h:111
uint8_t length
Definition: dtls_misc.h:140