38 lines
1.3 KiB
C
38 lines
1.3 KiB
C
/*
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* Copyright (c) 2024 Lucas Gabriel Vuotto <lucas@lgv5.net>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include "lilcrypto.h"
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#define CHACHA20_BLOCKLEN_WORDS (LC_CHACHA20_BLOCKLEN / sizeof(uint32_t))
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#define CHACHA20_CTRMAX 4294967295 /* 2^32 - 1 */
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#define CHACHA20_KEY_WORDS (LC_CHACHA20_KEYLEN / sizeof(uint32_t))
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#define CHACHA20_NONCE_WORDS 4
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#define CHACHA20_ROUNDS 10
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struct chacha20_ctx {
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uint32_t s[CHACHA20_BLOCKLEN_WORDS];
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uint32_t k[CHACHA20_KEY_WORDS];
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uint32_t n[CHACHA20_NONCE_WORDS];
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size_t mlen;
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uint8_t m[LC_CHACHA20_BLOCKLEN];
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};
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void chacha20_block(struct chacha20_ctx *);
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void hchacha20_block(struct chacha20_ctx *);
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