mirror of
https://github.com/openssl/openssl.git
synced 2024-11-21 01:15:20 +08:00
a28d06f3e9
Reviewed-by: Tomas Mraz <tomas@openssl.org> (Merged from https://github.com/openssl/openssl/pull/14235)
44 lines
1.7 KiB
C
44 lines
1.7 KiB
C
/*
|
|
* Copyright 2015-2021 The OpenSSL Project Authors. All Rights Reserved.
|
|
*
|
|
* Licensed under the Apache License 2.0 (the "License"). You may not use
|
|
* this file except in compliance with the License. You can obtain a copy
|
|
* in the file LICENSE in the source distribution or at
|
|
* https://www.openssl.org/source/license.html
|
|
*/
|
|
|
|
#ifndef OSSL_CRYPTO_CHACHA_H
|
|
#define OSSL_CRYPTO_CHACHA_H
|
|
# pragma once
|
|
|
|
#include <stddef.h>
|
|
|
|
/*
|
|
* ChaCha20_ctr32 encrypts |len| bytes from |inp| with the given key and
|
|
* nonce and writes the result to |out|, which may be equal to |inp|.
|
|
* The |key| is not 32 bytes of verbatim key material though, but the
|
|
* said material collected into 8 32-bit elements array in host byte
|
|
* order. Same approach applies to nonce: the |counter| argument is
|
|
* pointer to concatenated nonce and counter values collected into 4
|
|
* 32-bit elements. This, passing crypto material collected into 32-bit
|
|
* elements as opposite to passing verbatim byte vectors, is chosen for
|
|
* efficiency in multi-call scenarios.
|
|
*/
|
|
void ChaCha20_ctr32(unsigned char *out, const unsigned char *inp,
|
|
size_t len, const unsigned int key[8],
|
|
const unsigned int counter[4]);
|
|
/*
|
|
* You can notice that there is no key setup procedure. Because it's
|
|
* as trivial as collecting bytes into 32-bit elements, it's reckoned
|
|
* that below macro is sufficient.
|
|
*/
|
|
#define CHACHA_U8TOU32(p) ( \
|
|
((unsigned int)(p)[0]) | ((unsigned int)(p)[1]<<8) | \
|
|
((unsigned int)(p)[2]<<16) | ((unsigned int)(p)[3]<<24) )
|
|
|
|
#define CHACHA_KEY_SIZE 32
|
|
#define CHACHA_CTR_SIZE 16
|
|
#define CHACHA_BLK_SIZE 64
|
|
|
|
#endif
|