mirror of
https://github.com/veracrypt/VeraCrypt.git
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64 lines
2.1 KiB
C
64 lines
2.1 KiB
C
/* $OpenBSD: arc4random.c,v 1.54 2015/09/13 08:31:47 guenther Exp $ */
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/*
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* Copyright (c) 1996, David Mazieres <dm@uun.org>
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* Copyright (c) 2008, Damien Miller <djm@openbsd.org>
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* Copyright (c) 2013, Markus Friedl <markus@openbsd.org>
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* Copyright (c) 2014, Theo de Raadt <deraadt@openbsd.org>
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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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/*
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* ChaCha based random number generator for OpenBSD.
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*/
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/*
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* Adapted for VeraCrypt
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*/
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#ifndef HEADER_Crypto_ChaChaRng
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#define HEADER_Crypto_ChaChaRng
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#include "chacha256.h"
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#define CHACHA20RNG_KEYSZ 32
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#define CHACHA20RNG_IVSZ 8
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#define CHACHA20RNG_BLOCKSZ 64
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#define CHACHA20RNG_RSBUFSZ (16*CHACHA20RNG_BLOCKSZ)
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef void (*GetRandSeedFn)(unsigned char* pbRandSeed, size_t cbRandSeed);
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typedef struct
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{
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ChaCha256Ctx m_chachaCtx; /* ChaCha20 context */
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unsigned char m_rs_buf[CHACHA20RNG_RSBUFSZ]; /* keystream blocks */
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size_t m_rs_have; /* valid bytes at end of rs_buf */
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size_t m_rs_count; /* bytes till reseed */
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GetRandSeedFn m_getRandSeedCallback;
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} ChaCha20RngCtx;
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/* key length must be equal to 40 bytes (CHACHA20RNG_KEYSZ + CHACHA20RNG_IVSZ) */
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void ChaCha20RngInit (ChaCha20RngCtx* pCtx, const unsigned char* key, GetRandSeedFn rngCallback, size_t InitialBytesToSkip);
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void ChaCha20RngGetBytes (ChaCha20RngCtx* pCtx, unsigned char* buffer, size_t bufferLen);
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#ifdef __cplusplus
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}
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#endif
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#endif
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