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/* chacha.h
*
* Copyright (C) 2006-2020 wolfSSL Inc.
*
* This file is part of wolfSSL.
*
* wolfSSL is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* wolfSSL is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
*/
/*!
\file wolfssl/wolfcrypt/chacha.h
*/
#ifndef WOLF_CRYPT_CHACHA_H
#define WOLF_CRYPT_CHACHA_H
#include <wolfssl/wolfcrypt/types.h>
#ifdef HAVE_CHACHA
#ifdef __cplusplus
extern "C" {
#endif
/* Size of the IV */
#define CHACHA_IV_WORDS 3
#define CHACHA_IV_BYTES (CHACHA_IV_WORDS * sizeof(word32))
/* Size of ChaCha chunks */
#define CHACHA_CHUNK_WORDS 16
#define CHACHA_CHUNK_BYTES (CHACHA_CHUNK_WORDS * sizeof(word32))
#ifdef WOLFSSL_X86_64_BUILD
#if defined(USE_INTEL_SPEEDUP) && !defined(NO_CHACHA_ASM)
#define USE_INTEL_CHACHA_SPEEDUP
#define HAVE_INTEL_AVX1
#endif
#endif
enum {
CHACHA_ENC_TYPE = WC_CIPHER_CHACHA, /* cipher unique type */
CHACHA_MAX_KEY_SZ = 32,
};
typedef struct ChaCha {
word32 X[CHACHA_CHUNK_WORDS]; /* state of cipher */
word32 left; /* number of bytes leftover */
#ifdef HAVE_INTEL_AVX1
/* vpshufd reads 16 bytes but we only use bottom 4. */
byte extra[12];
#endif
} ChaCha;
/**
* IV(nonce) changes with each record
* counter is for what value the block counter should start ... usually 0
*/
WOLFSSL_API int wc_Chacha_SetIV(ChaCha* ctx, const byte* inIv, word32 counter);
WOLFSSL_API int wc_Chacha_Process(ChaCha* ctx, byte* cipher, const byte* plain,
word32 msglen);
WOLFSSL_API int wc_Chacha_SetKey(ChaCha* ctx, const byte* key, word32 keySz);
#ifdef __cplusplus
} /* extern "C" */
#endif
#endif /* HAVE_CHACHA */
#endif /* WOLF_CRYPT_CHACHA_H */
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