/* * Non-physical true random number generator based on timing jitter. * * Copyright Stephan Mueller <smueller@chronox.de>, 2013 - 2019 * * 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 * 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 #if CRYPTOPP_BOOL_X86 || CRYPTOPP_BOOL_X32 || CRYPTOPP_BOOL_X64 /* 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); } #else #include <time.h> VC_INLINE void jent_get_nstime(uint64 *out) { /* we could use CLOCK_MONOTONIC(_RAW), but with CLOCK_REALTIME * we get some nice extra entropy once in a while from the NTP actions * that we want to use as well... though, we do not rely on that * extra little entropy */ uint64_t tmp = 0; struct timespec time; if (clock_gettime(CLOCK_REALTIME, &time) == 0) { tmp = time.tv_sec; tmp = tmp << 32; tmp = tmp | time.tv_nsec; } *out = tmp; } #endif #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)