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55 lines
1.6 KiB
C
55 lines
1.6 KiB
C
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#if defined(__has_include)
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#if __has_include("config.h")
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#include "config.h"
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#endif
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#endif
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#ifdef _WIN32
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#include <windows.h>
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#endif
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#if (defined(__APPLE__) && defined(__MACH__)) || defined(__linux__)
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#define __STDC_WANT_LIB_EXT1__ 1
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#include <string.h>
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#endif
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#ifdef __FreeBSD__
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#include <strings.h>
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#endif
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#include <stdlib.h>
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#include <stdio.h>
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#include <limits.h>
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#include <inttypes.h>
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/* This is now a hand-written header */
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#include "lib_memzero0.h"
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#include "krml/internal/target.h"
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/* The F* formalization talks about the number of elements in the array. The C
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implementation wants a number of bytes in the array. KaRaMeL is aware of this
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and inserts a sizeof multiplication. */
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void Lib_Memzero0_memzero0(void *dst, uint64_t len) {
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/* This is safe: karamel checks at run-time (if needed) that all object sizes
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fit within a size_t, so the size we receive has been checked at
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allocation-time, possibly via KRML_CHECK_SIZE, to fit in a size_t. */
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size_t len_ = (size_t) len;
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#ifdef _WIN32
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SecureZeroMemory(dst, len);
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#elif defined(__APPLE__) && defined(__MACH__)
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memset_s(dst, len_, 0, len_);
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#elif (defined(__linux__) && !defined(LINUX_NO_EXPLICIT_BZERO)) || defined(__FreeBSD__)
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explicit_bzero(dst, len_);
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#elif defined(__NetBSD__)
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explicit_memset(dst, 0, len_);
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#else
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/* Default implementation for platforms with no particular support. */
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#warning "Your platform does not support any safe implementation of memzero -- consider a pull request!"
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volatile unsigned char *volatile dst_ = (volatile unsigned char *volatile) dst;
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size_t i = 0U;
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while (i < len)
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dst_[i++] = 0U;
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#endif
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}
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