94 lines
3.8 KiB
C
94 lines
3.8 KiB
C
/* ====================================================================
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* Copyright (c) 2014 The OpenSSL Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* openssl-core@openssl.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*
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*/
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#ifndef HEADER_CHACHA_H
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#define HEADER_CHACHA_H
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#include <stddef.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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# ifdef OPENSSL_NO_CHACHA
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# error CHACHA is disabled.
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# endif
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/*
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* ChaCha20_ctr32 encrypts |len| bytes from |inp| with the given key and
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* nonce and writes the result to |out|, which may be equal to |inp|.
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* The |key| is not 32 bytes of verbatim key material though, but the
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* said material collected into 8 32-bit elements array in host byte
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* order. Same approach applies to nonce: the |counter| argument is
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* pointer to concatenated nonce and counter values collected into 4
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* 32-bit elements. This, passing crypto material collected into 32-bit
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* elements as opposite to passing verbatim byte vectors, is chosen for
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* efficiency in multi-call scenarios.
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*/
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void ChaCha20_ctr32(unsigned char *out, const unsigned char *inp,
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size_t len, const unsigned int key[8],
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const unsigned int counter[4]);
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/*
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* You can notice that there is no key setup procedure. Because it's
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* as trivial as collecting bytes into 32-bit elements, it's reckoned
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* that below macro is sufficient.
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*/
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#define CHACHA_U8TOU32(p) ( \
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((unsigned int)(p)[0]) | ((unsigned int)(p)[1]<<8) | \
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((unsigned int)(p)[2]<<16) | ((unsigned int)(p)[3]<<24) )
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#define CHACHA_KEY_SIZE 32
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#define CHACHA_CTR_SIZE 16
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#define CHACHA_BLK_SIZE 64
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#ifdef __cplusplus
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}
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#endif
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#endif
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