87 lines
2.8 KiB
C
87 lines
2.8 KiB
C
/* $OpenBSD: chachapoly.h,v 1.4 2020/07/22 13:54:30 tobhe Exp $ */
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/*
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* Copyright (c) 2015 Mike Belopuhov
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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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#ifndef _CHACHAPOLY_H_
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#define _CHACHAPOLY_H_
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#define CHACHA20_KEYSIZE 32
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#define CHACHA20_CTR 4
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#define CHACHA20_SALT 4
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#define CHACHA20_NONCE 8
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#define CHACHA20_BLOCK_LEN 64
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struct chacha20_ctx {
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uint8_t block[CHACHA20_BLOCK_LEN];
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uint8_t nonce[CHACHA20_NONCE];
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};
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int chacha20_setkey(void *, u_int8_t *, int);
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void chacha20_reinit(caddr_t, u_int8_t *);
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void chacha20_crypt(caddr_t, u_int8_t *);
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#define POLY1305_KEYLEN 32
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#define POLY1305_TAGLEN 16
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#define POLY1305_BLOCK_LEN 16
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struct poly1305_ctx {
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/* r, h, pad, leftover */
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unsigned long state[5+5+4];
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size_t leftover;
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unsigned char buffer[POLY1305_BLOCK_LEN];
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unsigned char final;
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};
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typedef struct {
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uint8_t key[POLY1305_KEYLEN];
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/* counter, salt */
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uint8_t nonce[CHACHA20_NONCE];
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struct chacha20_ctx chacha;
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struct poly1305_ctx poly;
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} CHACHA20_POLY1305_CTX;
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void Chacha20_Poly1305_Init(void *);
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void Chacha20_Poly1305_Setkey(void *, const uint8_t *, uint16_t);
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void Chacha20_Poly1305_Reinit(void *, const uint8_t *, uint16_t);
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int Chacha20_Poly1305_Update(void *, const uint8_t *, uint16_t);
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void Chacha20_Poly1305_Final(uint8_t[POLY1305_TAGLEN], void *);
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/* WireGuard crypto */
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#define CHACHA20POLY1305_KEY_SIZE CHACHA20_KEYSIZE
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#define CHACHA20POLY1305_AUTHTAG_SIZE POLY1305_TAGLEN
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#define XCHACHA20POLY1305_NONCE_SIZE 24
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void chacha20poly1305_encrypt(uint8_t *, const uint8_t *, const size_t,
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const uint8_t *, const size_t, const uint64_t,
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const uint8_t[CHACHA20POLY1305_KEY_SIZE]);
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int chacha20poly1305_decrypt(uint8_t *, const uint8_t *, const size_t,
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const uint8_t *, const size_t, const uint64_t,
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const uint8_t[CHACHA20POLY1305_KEY_SIZE]);
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void xchacha20poly1305_encrypt(uint8_t *, const uint8_t *, const size_t,
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const uint8_t *, const size_t,
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const uint8_t[XCHACHA20POLY1305_NONCE_SIZE],
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const uint8_t[CHACHA20POLY1305_KEY_SIZE]);
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int xchacha20poly1305_decrypt(uint8_t *, const uint8_t *, const size_t,
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const uint8_t *, const size_t,
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const uint8_t[XCHACHA20POLY1305_NONCE_SIZE],
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const uint8_t[CHACHA20POLY1305_KEY_SIZE]);
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#endif /* _CHACHAPOLY_H_ */
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