mirror of
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152 lines
3.8 KiB
C
152 lines
3.8 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 - 2022
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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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e 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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#ifndef _JITTERENTROPY_BASE_X86_H
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#define _JITTERENTROPY_BASE_X86_H
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#if defined(_MSC_VER)
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typedef __int64 ssize_t;
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#include <windows.h>
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#endif
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include <intrin.h>
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#if defined(AWSLC)
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#include <openssl/crypto.h>
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#endif
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#if defined(_M_ARM) || defined(_M_ARM64)
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#include <profileapi.h>
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#include <windows.h>
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#endif
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static void jent_get_nstime(uint64_t *out)
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{
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#if defined(_M_ARM) || defined(_M_ARM64)
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/* Generic code. */
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LARGE_INTEGER ticks;
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QueryPerformanceCounter(&ticks);
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*out = ticks.QuadPart;
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#else
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/* x86, x86_64 intrinsic */
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*out = __rdtsc();
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#endif
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}
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static inline void *jent_zalloc(size_t len)
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{
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void *tmp = NULL;
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/* we have no secure memory allocation! Hence
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* we do not sed CRYPTO_CPU_JITTERENTROPY_SECURE_MEMORY */
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#if defined(AWSLC)
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tmp = OPENSSL_malloc(len);
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#else
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tmp = malloc(len);
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#endif
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if(NULL != tmp)
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memset(tmp, 0, len);
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return tmp;
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}
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static inline void jent_zfree(void *ptr, unsigned int len)
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{
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#if defined(AWSLC)
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(void) len;
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OPENSSL_free(ptr);
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#else
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memset(ptr, 0, len);
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free(ptr);
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#endif
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}
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static inline int jent_fips_enabled(void)
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{
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#if defined(AWSLC)
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return FIPS_mode();
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#else
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return 0;
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#endif
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}
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static inline void jent_memset_secure(void *s, size_t n)
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{
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#if defined(AWSLC)
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OPENSSL_cleanse(s, n);
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#else
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SecureZeroMemory(s, n);
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#endif
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}
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static inline long jent_ncpu(void)
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{
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/*
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* TODO: return number of available CPUs -
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* this code disables timer thread as only one CPU is "detected".
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*/
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return 1;
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}
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static inline void jent_yield(void) { }
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static inline uint32_t jent_cache_size_roundup(void)
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{
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return 0;
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}
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/* --- helpers needed in user space -- */
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/* note: these helper functions are shamelessly stolen from the kernel :-) */
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static inline uint64_t rol64(uint64_t word, unsigned int shift)
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{
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return (word << shift) | (word >> (64 - shift));
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}
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#endif /* _JITTERENTROPY_BASE_X86_H */
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