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/*
* Non-physical true random number generator based on timing jitter.
*
* Copyright Stephan Mueller <smueller@chronox.de>, 2013
*
* License
* =======
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, and the entire permission notice in its entirety,
* including the disclaimer of warranties.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote
* products derived from this software without specific prior
* written permission.
*
* ALTERNATIVELY, this product may be distributed under the terms of
* the GNU General Public License, in which case the provisions of the GPL are
* required INSTEAD OF the above restrictions. (This clause is
* necessary due to a potential bad interaction between the GPL and
* the restrictions contained in a BSD-style copyright.)
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ALL OF
* WHICH ARE HEREBY DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
e USE OF THIS SOFTWARE, EVEN IF NOT ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*/
/* Adapted for VeraCrypt */
#pragma once
#include "Common/Tcdefs.h"
#include "misc.h"
#include "cpu.h"
#include <stdlib.h>
#include <string.h>
#ifdef _MSC_VER
typedef uint64 uint64_t;
typedef int64 int64_t;
#ifndef _UEFI
#define CONFIG_CRYPTO_CPU_JITTERENTROPY_SECURE_MEMORY
#endif
#ifndef _UEFI
typedef SSIZE_T ssize_t;
#else
#if CRYPTOPP_BOOL_X64
typedef int64 ssize_t;
#else
typedef int32 ssize_t;
#endif
#endif
static VC_INLINE void jent_get_nstime(uint64 *out)
{
*out = __rdtsc();;
}
#else
/* taken from Linux kernel */
#if CRYPTOPP_BOOL_X64
#define DECLARE_ARGS(val, low, high) unsigned low, high
#define EAX_EDX_VAL(val, low, high) ((low) | ((uint64)(high) << 32))
#define EAX_EDX_RET(val, low, high) "=a" (low), "=d" (high)
#else
#define DECLARE_ARGS(val, low, high) unsigned long long val
#define EAX_EDX_VAL(val, low, high) (val)
#define EAX_EDX_RET(val, low, high) "=A" (val)
#endif
VC_INLINE void jent_get_nstime(uint64 *out)
{
DECLARE_ARGS(val, low, high);
asm volatile("rdtsc" : EAX_EDX_RET(val, low, high));
*out = EAX_EDX_VAL(val, low, high);
}
#endif
#ifdef _MSC_VER
static
#endif
VC_INLINE void *jent_zalloc(size_t len)
{
void *tmp = NULL;
tmp = TCalloc(len);
if(NULL != tmp)
{
memset(tmp, 0, len);
#if defined(_WIN32) && !defined(TC_WINDOWS_DRIVER) && !defined(_UEFI)
VirtualLock (tmp, len);
#endif
}
return tmp;
}
#ifdef _MSC_VER
static
#endif
VC_INLINE void jent_zfree(void *ptr, unsigned int len)
{
if (len % 8)
burn(ptr, len);
else
FAST_ERASE64(ptr, len);
#if defined(_WIN32) && !defined(TC_WINDOWS_DRIVER) && !defined(_UEFI)
VirtualUnlock (ptr, len);
#endif
TCfree(ptr);
}
#ifdef _MSC_VER
static
#endif
VC_INLINE int jent_fips_enabled(void)
{
return 0;
}
/* --- helpers needed in user space -- */
#define rol64(x,n) rotl64(x,n)
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