123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115 |
- /* chacha.h
- *
- * Copyright (C) 2006-2022 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
- */
- /*
- DESCRIPTION
- This library contains implementation for the ChaCha20 stream cipher.
- */
- /*!
- \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
- /*
- Initialization vector starts at 13 with zero being the index origin of a matrix.
- Block counter is located at index 12.
- 0 1 2 3
- 4 5 6 7
- 8 9 10 11
- 12 13 14 15
- */
- #define CHACHA_MATRIX_CNT_IV 12
- /* Size of the IV */
- #define CHACHA_IV_WORDS 3
- /* Size of IV in bytes*/
- #define CHACHA_IV_BYTES 12
- #ifdef HAVE_XCHACHA
- #define XCHACHA_NONCE_BYTES 24
- #endif
- /* 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 */
- #ifdef HAVE_INTEL_AVX1
- /* vpshufd reads 16 bytes but we only use bottom 4. */
- byte extra[12];
- #endif
- word32 left; /* number of bytes leftover */
- #if defined(USE_INTEL_CHACHA_SPEEDUP) || defined(WOLFSSL_ARMASM)
- word32 over[CHACHA_CHUNK_WORDS];
- #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_LOCAL void wc_Chacha_purge_current_block(ChaCha* ctx);
- WOLFSSL_API int wc_Chacha_SetKey(ChaCha* ctx, const byte* key, word32 keySz);
- #ifdef HAVE_XCHACHA
- WOLFSSL_API int wc_XChacha_SetKey(ChaCha *ctx, const byte *key, word32 keySz,
- const byte *nonce, word32 nonceSz,
- word32 counter);
- #endif
- #ifdef __cplusplus
- } /* extern "C" */
- #endif
- #endif /* HAVE_CHACHA */
- #endif /* WOLF_CRYPT_CHACHA_H */
|