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/* $OpenBSD: chacha.h,v 1.8 2019/01/22 00:59:21 dlg Exp $ */
/*
* Copyright (c) 2014 Joel Sing <jsing@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef HEADER_CHACHA_H
#define HEADER_CHACHA_H
#include <openssl/opensslconf.h>
#if defined(OPENSSL_NO_CHACHA)
#error ChaCha is disabled.
#endif
#include <stddef.h>
#include <stdint.h>
#ifdef __cplusplus
extern "C" {
#endif
typedef struct {
unsigned int input[16];
unsigned char ks[64];
unsigned char unused;
} ChaCha_ctx;
void ChaCha_set_key(ChaCha_ctx *ctx, const unsigned char *key,
unsigned int keybits);
void ChaCha_set_iv(ChaCha_ctx *ctx, const unsigned char *iv,
const unsigned char *counter);
void ChaCha(ChaCha_ctx *ctx, unsigned char *out, const unsigned char *in,
size_t len);
void CRYPTO_chacha_20(unsigned char *out, const unsigned char *in, size_t len,
const unsigned char key[32], const unsigned char iv[8], uint64_t counter);
void CRYPTO_xchacha_20(unsigned char *out, const unsigned char *in, size_t len,
const unsigned char key[32], const unsigned char iv[24]);
void CRYPTO_hchacha_20(unsigned char out[32],
const unsigned char key[32], const unsigned char iv[16]);
#ifdef __cplusplus
}
#endif
#endif /* HEADER_CHACHA_H */
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