cryb-to/include/cryb/salsa.h
Dag-Erling Smørgrav 371d519169 Implement the Salsa family of stream ciphers.
Note that we only have unit tests for Salsa20.
2017-03-18 14:42:26 +01:00

66 lines
2.4 KiB
C

/*-
* Copyright (c) 2017 Dag-Erling Smørgrav
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef CRYB_SALSA_H_INCLUDED
#define CRYB_SALSA_H_INCLUDED
#ifndef CRYB_TO
#include <cryb/to.h>
#endif
#include <cryb/cipher.h>
CRYB_BEGIN
#define salsa_cipher cryb_salsa_cipher
#define salsa_ctx cryb_salsa_ctx
#define salsa_init cryb_salsa_init
#define salsa_reset cryb_salsa_reset
#define salsa_keystream cryb_salsa_keystream
#define salsa_encrypt cryb_salsa_encrypt
#define salsa_decrypt cryb_salsa_decrypt
#define salsa_finish cryb_salsa_finish
extern cipher_algorithm salsa_cipher;
typedef struct {
uint32_t state[16];
unsigned int rounds;
} salsa_ctx;
void salsa_init(salsa_ctx *, cipher_mode, const uint8_t *, size_t);
void salsa_reset(salsa_ctx *, const uint8_t *, unsigned int);
size_t salsa_keystream(salsa_ctx *, uint8_t *, size_t);
size_t salsa_encrypt(salsa_ctx *, const void *, uint8_t *, size_t);
size_t salsa_decrypt(salsa_ctx *, const uint8_t *, void *, size_t);
void salsa_finish(salsa_ctx *);
CRYB_END
#endif