91 lines
3.7 KiB
C
91 lines
3.7 KiB
C
|
/* ====================================================================
|
||
|
|
* Copyright (c) 2014 The OpenSSL Project. 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. All advertising materials mentioning features or use of this
|
||
|
|
* software must display the following acknowledgment:
|
||
|
|
* "This product includes software developed by the OpenSSL Project
|
||
|
|
* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
|
||
|
|
*
|
||
|
|
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
|
||
|
|
* endorse or promote products derived from this software without
|
||
|
|
* prior written permission. For written permission, please contact
|
||
|
|
* openssl-core@openssl.org.
|
||
|
|
*
|
||
|
|
* 5. Products derived from this software may not be called "OpenSSL"
|
||
|
|
* nor may "OpenSSL" appear in their names without prior written
|
||
|
|
* permission of the OpenSSL Project.
|
||
|
|
*
|
||
|
|
* 6. Redistributions of any form whatsoever must retain the following
|
||
|
|
* acknowledgment:
|
||
|
|
* "This product includes software developed by the OpenSSL Project
|
||
|
|
* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
|
||
|
|
*
|
||
|
|
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
|
||
|
|
* EXPRESSED 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 OpenSSL PROJECT OR
|
||
|
|
* ITS 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 HEADER_CHACHA_H
|
||
|
|
#define HEADER_CHACHA_H
|
||
|
|
|
||
|
|
#include <stddef.h>
|
||
|
|
|
||
|
|
#ifdef __cplusplus
|
||
|
|
extern "C" {
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/*
|
||
|
|
* 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
|
||
|
|
|
||
|
|
#ifdef __cplusplus
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
#endif
|