1/* Copyright (c) 2014, Google Inc.
2 *
3 * Permission to use, copy, modify, and/or distribute this software for any
4 * purpose with or without fee is hereby granted, provided that the above
5 * copyright notice and this permission notice appear in all copies.
6 *
7 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
8 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
9 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
10 * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
11 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
12 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
13 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
14
15#ifndef OPENSSL_HEADER_CHACHA_H
16#define OPENSSL_HEADER_CHACHA_H
17
18#include <openssl/base.h>
19
20#if defined(__cplusplus)
21extern "C" {
22#endif
23
24// ChaCha20.
25//
26// ChaCha20 is a stream cipher. See https://tools.ietf.org/html/rfc7539.
27
28
29// CRYPTO_chacha_20 encrypts |in_len| bytes from |in| with the given key and
30// nonce and writes the result to |out|. If |in| and |out| alias, they must be
31// equal. The initial block counter is specified by |counter|.
32OPENSSL_EXPORT void CRYPTO_chacha_20(uint8_t *out, const uint8_t *in,
33 size_t in_len, const uint8_t key[32],
34 const uint8_t nonce[12], uint32_t counter);
35
36
37#if defined(__cplusplus)
38} // extern C
39#endif
40
41#endif // OPENSSL_HEADER_CHACHA_H
42