62 lines
2.5 KiB
C
62 lines
2.5 KiB
C
/*
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* Copyright (c) 2021 Daniel Hope (www.floorsense.nz)
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* 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 notice, this
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* list of conditions and the following disclaimer in the documentation and/or
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* other materials provided with the distribution.
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*
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* 3. Neither the name of "Floorsense Ltd", "Agile Workspace Ltd" nor the names of
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* its contributors may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* Author: Daniel Hope <daniel.hope@smartalock.com>
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*/
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// RFC7539 implementation of ChaCha20 with modified nonce size for WireGuard
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// https://tools.ietf.org/html/rfc7539
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// Adapted from https://cr.yp.to/streamciphers/timings/estreambench/submissions/salsa20/chacha8/ref/chacha.c by D. J. Bernstein (Public Domain)
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// HChaCha20 is described here: https://tools.ietf.org/id/draft-arciszewski-xchacha-02.html
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#ifndef _CHACHA20_H_
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#define _CHACHA20_H_
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <stdint.h>
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#define CHACHA20_BLOCK_SIZE (64)
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#define CHACHA20_KEY_SIZE (32)
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struct chacha20_ctx {
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uint32_t state[16];
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};
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void chacha20_init(struct chacha20_ctx *ctx, const uint8_t *key, const uint64_t nonce);
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void chacha20(struct chacha20_ctx *ctx, uint8_t *out, const uint8_t *in, uint32_t len);
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void hchacha20(uint8_t *out, const uint8_t *nonce, const uint8_t *key);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _CHACHA20_H_ */
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