lc_chacha20_private.h

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/*
 * Copyright (C) 2022 - 2024, Stephan Mueller <smueller@chronox.de>
 *
 * License: see LICENSE file in root directory
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ALL OF
 * WHICH ARE HEREBY DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR 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 NOT ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGE.
 */
 
#ifndef LC_CHACHA20_PRIVATE_H
#define LC_CHACHA20_PRIVATE_H
 
#include "ext_headers.h"
 
#ifdef __cplusplus
extern "C" {
#endif
 
#define LC_CC20_KEY_SIZE 32
#define LC_CC20_KEY_SIZE_WORDS (LC_CC20_KEY_SIZE / sizeof(uint32_t))
 
/* State according to RFC 7539 section 2.3 */
struct lc_sym_state {
        uint32_t constants[4];
        union {
                uint32_t u[LC_CC20_KEY_SIZE_WORDS];
                uint8_t b[LC_CC20_KEY_SIZE];
        } key;
        uint32_t counter;
        uint32_t nonce[3];
};
 
#define LC_CC20_BLOCK_SIZE sizeof(struct lc_sym_state)
#define LC_CC20_BLOCK_SIZE_WORDS (LC_CC20_BLOCK_SIZE / sizeof(uint32_t))
 
#ifdef __cplusplus
}
#endif
 
#endif /* LC_CHACHA20_PRIVATE_H */