181 lines
4.5 KiB
C
181 lines
4.5 KiB
C
/*
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* Non-physical true random number generator based on timing jitter.
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*
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* Copyright Stephan Mueller <smueller@chronox.de>, 2013 - 2019
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*
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* License
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* =======
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, and the entire permission notice in its entirety,
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* including the disclaimer of warranties.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote
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* products derived from this software without specific prior
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* written permission.
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*
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* ALTERNATIVELY, this product may be distributed under the terms of
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* the GNU General Public License, in which case the provisions of the GPL are
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* required INSTEAD OF the above restrictions. (This clause is
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* necessary due to a potential bad interaction between the GPL and
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* the restrictions contained in a BSD-style copyright.)
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ALL OF
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* WHICH ARE HEREBY DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
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* USE OF THIS SOFTWARE, EVEN IF NOT ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*/
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/* Adapted for VeraCrypt */
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#pragma once
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#include "Common/Tcdefs.h"
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#include "misc.h"
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#include "cpu.h"
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#include <stdlib.h>
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#include <string.h>
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#ifdef _MSC_VER
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typedef uint64 uint64_t;
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typedef int64 int64_t;
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#ifndef _UEFI
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#define CONFIG_CRYPTO_CPU_JITTERENTROPY_SECURE_MEMORY
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#endif
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#ifndef _UEFI
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typedef SSIZE_T ssize_t;
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#else
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#if CRYPTOPP_BOOL_X64
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typedef int64 ssize_t;
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#else
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typedef int32 ssize_t;
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#endif
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#endif
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static VC_INLINE void jent_get_nstime(uint64 *out)
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{
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#ifdef _M_ARM64
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LARGE_INTEGER v = { 0 };
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#ifdef TC_WINDOWS_DRIVER
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v = KeQueryPerformanceCounter(NULL);
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#else
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QueryPerformanceCounter(&v);
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#endif
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* out = v.QuadPart;
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#else
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*out = __rdtsc();
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#endif
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}
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#else
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#include <sys/types.h>
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#if CRYPTOPP_BOOL_X86 || CRYPTOPP_BOOL_X32 || CRYPTOPP_BOOL_X64
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/* taken from Linux kernel */
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#if CRYPTOPP_BOOL_X64
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#define DECLARE_ARGS(val, low, high) unsigned low, high
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#define EAX_EDX_VAL(val, low, high) ((low) | ((uint64)(high) << 32))
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#define EAX_EDX_RET(val, low, high) "=a" (low), "=d" (high)
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#else
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#define DECLARE_ARGS(val, low, high) unsigned long long val
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#define EAX_EDX_VAL(val, low, high) (val)
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#define EAX_EDX_RET(val, low, high) "=A" (val)
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#endif
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VC_INLINE void jent_get_nstime(uint64 *out)
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{
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DECLARE_ARGS(val, low, high);
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asm volatile("rdtsc" : EAX_EDX_RET(val, low, high));
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*out = EAX_EDX_VAL(val, low, high);
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}
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#else
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#include <time.h>
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VC_INLINE void jent_get_nstime(uint64 *out)
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{
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/* we could use CLOCK_MONOTONIC(_RAW), but with CLOCK_REALTIME
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* we get some nice extra entropy once in a while from the NTP actions
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* that we want to use as well... though, we do not rely on that
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* extra little entropy */
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uint64_t tmp = 0;
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struct timespec time;
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if (clock_gettime(CLOCK_REALTIME, &time) == 0)
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{
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tmp = time.tv_sec;
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tmp = tmp << 32;
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tmp = tmp | time.tv_nsec;
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}
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*out = tmp;
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}
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#endif
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#endif
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#ifdef _MSC_VER
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static
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#endif
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VC_INLINE void *jent_zalloc(size_t len)
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{
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void *tmp = NULL;
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tmp = TCalloc(len);
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if(NULL != tmp)
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{
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memset(tmp, 0, len);
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#if defined(_WIN32) && !defined(TC_WINDOWS_DRIVER) && !defined(_UEFI)
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VirtualLock (tmp, len);
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#endif
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}
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return tmp;
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}
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#ifdef _MSC_VER
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static
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#endif
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VC_INLINE void jent_zfree(void *ptr, unsigned int len)
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{
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if (len % 8)
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burn(ptr, len);
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else
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FAST_ERASE64(ptr, len);
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#if defined(_WIN32) && !defined(TC_WINDOWS_DRIVER) && !defined(_UEFI)
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VirtualUnlock (ptr, len);
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#endif
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TCfree(ptr);
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}
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#ifdef _MSC_VER
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static
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#endif
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VC_INLINE int jent_fips_enabled(void)
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{
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return 1;
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}
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/* --- helpers needed in user space -- */
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#define rol64(x,n) rotl64(x,n)
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