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| author | Mounir IDRASSI <mounir.idrassi@idrix.fr> | 2019-02-08 01:48:12 +0100 |
|---|---|---|
| committer | Mounir IDRASSI <mounir.idrassi@idrix.fr> | 2019-02-08 01:50:12 +0100 |
| commit | ba5da0946c3abaa93d1161ca512c3c326cda3736 (patch) | |
| tree | 128c238dea40ac0de0c7de8e0b02810eabc8e564 /src/Crypto/chachaRng.h | |
| parent | e5b9cee8681dc45340321f759079b344a3b2676c (diff) | |
| download | VeraCrypt-ba5da0946c3abaa93d1161ca512c3c326cda3736.tar.gz VeraCrypt-ba5da0946c3abaa93d1161ca512c3c326cda3736.zip | |
Windows: Add implementation of ChaCha20 based random generator. Use it for driver need of random bytes (currently only wipe bytes but more to come later).
Diffstat (limited to 'src/Crypto/chachaRng.h')
| -rw-r--r-- | src/Crypto/chachaRng.h | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/src/Crypto/chachaRng.h b/src/Crypto/chachaRng.h new file mode 100644 index 00000000..a2cb4ce8 --- /dev/null +++ b/src/Crypto/chachaRng.h @@ -0,0 +1,63 @@ +/* $OpenBSD: arc4random.c,v 1.54 2015/09/13 08:31:47 guenther Exp $ */ + +/* + * Copyright (c) 1996, David Mazieres <dm@uun.org> + * Copyright (c) 2008, Damien Miller <djm@openbsd.org> + * Copyright (c) 2013, Markus Friedl <markus@openbsd.org> + * Copyright (c) 2014, Theo de Raadt <deraadt@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. + */ + +/* + * ChaCha based random number generator for OpenBSD. + */ + +/* + * Adapted for VeraCrypt + */ + +#ifndef HEADER_Crypto_ChaChaRng +#define HEADER_Crypto_ChaChaRng + +#include "chacha256.h" + +#define CHACHA20RNG_KEYSZ 32 +#define CHACHA20RNG_IVSZ 8 +#define CHACHA20RNG_BLOCKSZ 64 +#define CHACHA20RNG_RSBUFSZ (16*CHACHA20RNG_BLOCKSZ) + +#ifdef __cplusplus +extern "C" { +#endif + +typedef void (*GetRandSeedFn)(unsigned char* pbRandSeed, size_t cbRandSeed); + +typedef struct +{ + ChaCha256Ctx m_chachaCtx; /* ChaCha20 context */ + unsigned char m_rs_buf[CHACHA20RNG_RSBUFSZ]; /* keystream blocks */ + size_t m_rs_have; /* valid bytes at end of rs_buf */ + size_t m_rs_count; /* bytes till reseed */ + GetRandSeedFn m_getRandSeedCallback; +} ChaCha20RngCtx; + +/* key length must be equal to 40 bytes (CHACHA20RNG_KEYSZ + CHACHA20RNG_IVSZ) */ +void ChaCha20RngInit (ChaCha20RngCtx* pCtx, const unsigned char* key, GetRandSeedFn rngCallback, size_t InitialBytesToSkip); +void ChaCha20RngGetBytes (ChaCha20RngCtx* pCtx, unsigned char* buffer, size_t bufferLen); + +#ifdef __cplusplus +} +#endif + +#endif |