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104 lines
2.6 KiB
C
104 lines
2.6 KiB
C
/* chacha.h
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*
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* Copyright (C) 2006-2020 wolfSSL Inc.
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*
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* This file is part of wolfSSL.
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*
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* wolfSSL is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* wolfSSL is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
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*/
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/*
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DESCRIPTION
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This library contains implementation for the ChaCha20 stream cipher.
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*/
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/*!
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\file wolfssl/wolfcrypt/chacha.h
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*/
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#ifndef WOLF_CRYPT_CHACHA_H
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#define WOLF_CRYPT_CHACHA_H
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#include <libwolfssl/wolfcrypt/types.h>
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#ifdef HAVE_CHACHA
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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Initialization vector starts at 13 with zero being the index origin of a matrix.
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Block counter is located at index 12.
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0 1 2 3
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4 5 6 7
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8 9 10 11
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12 13 14 15
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*/
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#define CHACHA_MATRIX_CNT_IV 12
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/* Size of the IV */
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#define CHACHA_IV_WORDS 3
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/* Size of IV in bytes*/
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#define CHACHA_IV_BYTES 12
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/* Size of ChaCha chunks */
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#define CHACHA_CHUNK_WORDS 16
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#define CHACHA_CHUNK_BYTES (CHACHA_CHUNK_WORDS * sizeof(word32))
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#ifdef WOLFSSL_X86_64_BUILD
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#if defined(USE_INTEL_SPEEDUP) && !defined(NO_CHACHA_ASM)
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#define USE_INTEL_CHACHA_SPEEDUP
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#define HAVE_INTEL_AVX1
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#endif
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#endif
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enum {
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CHACHA_ENC_TYPE = WC_CIPHER_CHACHA, /* cipher unique type */
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CHACHA_MAX_KEY_SZ = 32,
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};
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typedef struct ChaCha {
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word32 X[CHACHA_CHUNK_WORDS]; /* state of cipher */
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#ifdef HAVE_INTEL_AVX1
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/* vpshufd reads 16 bytes but we only use bottom 4. */
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byte extra[12];
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#endif
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word32 left; /* number of bytes leftover */
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#ifdef USE_INTEL_CHACHA_SPEEDUP
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word32 over[CHACHA_CHUNK_WORDS];
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#endif
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} ChaCha;
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/**
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* IV(nonce) changes with each record
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* counter is for what value the block counter should start ... usually 0
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*/
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WOLFSSL_API int wc_Chacha_SetIV(ChaCha* ctx, const byte* inIv, word32 counter);
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WOLFSSL_API int wc_Chacha_Process(ChaCha* ctx, byte* cipher, const byte* plain,
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word32 msglen);
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WOLFSSL_API int wc_Chacha_SetKey(ChaCha* ctx, const byte* key, word32 keySz);
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#ifdef __cplusplus
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} /* extern "C" */
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#endif
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#endif /* HAVE_CHACHA */
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#endif /* WOLF_CRYPT_CHACHA_H */
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