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Diffstat (limited to 'lib/mbedtls-2.27.0/library/timing.c')
-rw-r--r--lib/mbedtls-2.27.0/library/timing.c530
1 files changed, 530 insertions, 0 deletions
diff --git a/lib/mbedtls-2.27.0/library/timing.c b/lib/mbedtls-2.27.0/library/timing.c
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+/*
+ * Portable interface to the CPU cycle counter
+ *
+ * Copyright The Mbed TLS Contributors
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "common.h"
+
+#if defined(MBEDTLS_SELF_TEST) && defined(MBEDTLS_PLATFORM_C)
+#include "mbedtls/platform.h"
+#else
+#include <stdio.h>
+#define mbedtls_printf printf
+#endif
+
+#if defined(MBEDTLS_TIMING_C)
+
+#include "mbedtls/timing.h"
+
+#if !defined(MBEDTLS_TIMING_ALT)
+
+#if !defined(unix) && !defined(__unix__) && !defined(__unix) && \
+ !defined(__APPLE__) && !defined(_WIN32) && !defined(__QNXNTO__) && \
+ !defined(__HAIKU__) && !defined(__midipix__)
+#error "This module only works on Unix and Windows, see MBEDTLS_TIMING_C in config.h"
+#endif
+
+#ifndef asm
+#define asm __asm
+#endif
+
+#if defined(_WIN32) && !defined(EFIX64) && !defined(EFI32)
+
+#include <windows.h>
+#include <process.h>
+
+struct _hr_time
+{
+ LARGE_INTEGER start;
+};
+
+#else
+
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/time.h>
+#include <signal.h>
+#include <time.h>
+
+struct _hr_time
+{
+ struct timeval start;
+};
+
+#endif /* _WIN32 && !EFIX64 && !EFI32 */
+
+#if !defined(HAVE_HARDCLOCK) && defined(MBEDTLS_HAVE_ASM) && \
+ ( defined(_MSC_VER) && defined(_M_IX86) ) || defined(__WATCOMC__)
+
+#define HAVE_HARDCLOCK
+
+unsigned long mbedtls_timing_hardclock( void )
+{
+ unsigned long tsc;
+ __asm rdtsc
+ __asm mov [tsc], eax
+ return( tsc );
+}
+#endif /* !HAVE_HARDCLOCK && MBEDTLS_HAVE_ASM &&
+ ( _MSC_VER && _M_IX86 ) || __WATCOMC__ */
+
+/* some versions of mingw-64 have 32-bit longs even on x84_64 */
+#if !defined(HAVE_HARDCLOCK) && defined(MBEDTLS_HAVE_ASM) && \
+ defined(__GNUC__) && ( defined(__i386__) || ( \
+ ( defined(__amd64__) || defined( __x86_64__) ) && __SIZEOF_LONG__ == 4 ) )
+
+#define HAVE_HARDCLOCK
+
+unsigned long mbedtls_timing_hardclock( void )
+{
+ unsigned long lo, hi;
+ asm volatile( "rdtsc" : "=a" (lo), "=d" (hi) );
+ return( lo );
+}
+#endif /* !HAVE_HARDCLOCK && MBEDTLS_HAVE_ASM &&
+ __GNUC__ && __i386__ */
+
+#if !defined(HAVE_HARDCLOCK) && defined(MBEDTLS_HAVE_ASM) && \
+ defined(__GNUC__) && ( defined(__amd64__) || defined(__x86_64__) )
+
+#define HAVE_HARDCLOCK
+
+unsigned long mbedtls_timing_hardclock( void )
+{
+ unsigned long lo, hi;
+ asm volatile( "rdtsc" : "=a" (lo), "=d" (hi) );
+ return( lo | ( hi << 32 ) );
+}
+#endif /* !HAVE_HARDCLOCK && MBEDTLS_HAVE_ASM &&
+ __GNUC__ && ( __amd64__ || __x86_64__ ) */
+
+#if !defined(HAVE_HARDCLOCK) && defined(MBEDTLS_HAVE_ASM) && \
+ defined(__GNUC__) && ( defined(__powerpc__) || defined(__ppc__) )
+
+#define HAVE_HARDCLOCK
+
+unsigned long mbedtls_timing_hardclock( void )
+{
+ unsigned long tbl, tbu0, tbu1;
+
+ do
+ {
+ asm volatile( "mftbu %0" : "=r" (tbu0) );
+ asm volatile( "mftb %0" : "=r" (tbl ) );
+ asm volatile( "mftbu %0" : "=r" (tbu1) );
+ }
+ while( tbu0 != tbu1 );
+
+ return( tbl );
+}
+#endif /* !HAVE_HARDCLOCK && MBEDTLS_HAVE_ASM &&
+ __GNUC__ && ( __powerpc__ || __ppc__ ) */
+
+#if !defined(HAVE_HARDCLOCK) && defined(MBEDTLS_HAVE_ASM) && \
+ defined(__GNUC__) && defined(__sparc64__)
+
+#if defined(__OpenBSD__)
+#warning OpenBSD does not allow access to tick register using software version instead
+#else
+#define HAVE_HARDCLOCK
+
+unsigned long mbedtls_timing_hardclock( void )
+{
+ unsigned long tick;
+ asm volatile( "rdpr %%tick, %0;" : "=&r" (tick) );
+ return( tick );
+}
+#endif /* __OpenBSD__ */
+#endif /* !HAVE_HARDCLOCK && MBEDTLS_HAVE_ASM &&
+ __GNUC__ && __sparc64__ */
+
+#if !defined(HAVE_HARDCLOCK) && defined(MBEDTLS_HAVE_ASM) && \
+ defined(__GNUC__) && defined(__sparc__) && !defined(__sparc64__)
+
+#define HAVE_HARDCLOCK
+
+unsigned long mbedtls_timing_hardclock( void )
+{
+ unsigned long tick;
+ asm volatile( ".byte 0x83, 0x41, 0x00, 0x00" );
+ asm volatile( "mov %%g1, %0" : "=r" (tick) );
+ return( tick );
+}
+#endif /* !HAVE_HARDCLOCK && MBEDTLS_HAVE_ASM &&
+ __GNUC__ && __sparc__ && !__sparc64__ */
+
+#if !defined(HAVE_HARDCLOCK) && defined(MBEDTLS_HAVE_ASM) && \
+ defined(__GNUC__) && defined(__alpha__)
+
+#define HAVE_HARDCLOCK
+
+unsigned long mbedtls_timing_hardclock( void )
+{
+ unsigned long cc;
+ asm volatile( "rpcc %0" : "=r" (cc) );
+ return( cc & 0xFFFFFFFF );
+}
+#endif /* !HAVE_HARDCLOCK && MBEDTLS_HAVE_ASM &&
+ __GNUC__ && __alpha__ */
+
+#if !defined(HAVE_HARDCLOCK) && defined(MBEDTLS_HAVE_ASM) && \
+ defined(__GNUC__) && defined(__ia64__)
+
+#define HAVE_HARDCLOCK
+
+unsigned long mbedtls_timing_hardclock( void )
+{
+ unsigned long itc;
+ asm volatile( "mov %0 = ar.itc" : "=r" (itc) );
+ return( itc );
+}
+#endif /* !HAVE_HARDCLOCK && MBEDTLS_HAVE_ASM &&
+ __GNUC__ && __ia64__ */
+
+#if !defined(HAVE_HARDCLOCK) && defined(_MSC_VER) && \
+ !defined(EFIX64) && !defined(EFI32)
+
+#define HAVE_HARDCLOCK
+
+unsigned long mbedtls_timing_hardclock( void )
+{
+ LARGE_INTEGER offset;
+
+ QueryPerformanceCounter( &offset );
+
+ return( (unsigned long)( offset.QuadPart ) );
+}
+#endif /* !HAVE_HARDCLOCK && _MSC_VER && !EFIX64 && !EFI32 */
+
+#if !defined(HAVE_HARDCLOCK)
+
+#define HAVE_HARDCLOCK
+
+static int hardclock_init = 0;
+static struct timeval tv_init;
+
+unsigned long mbedtls_timing_hardclock( void )
+{
+ struct timeval tv_cur;
+
+ if( hardclock_init == 0 )
+ {
+ gettimeofday( &tv_init, NULL );
+ hardclock_init = 1;
+ }
+
+ gettimeofday( &tv_cur, NULL );
+ return( ( tv_cur.tv_sec - tv_init.tv_sec ) * 1000000
+ + ( tv_cur.tv_usec - tv_init.tv_usec ) );
+}
+#endif /* !HAVE_HARDCLOCK */
+
+volatile int mbedtls_timing_alarmed = 0;
+
+#if defined(_WIN32) && !defined(EFIX64) && !defined(EFI32)
+
+unsigned long mbedtls_timing_get_timer( struct mbedtls_timing_hr_time *val, int reset )
+{
+ struct _hr_time *t = (struct _hr_time *) val;
+
+ if( reset )
+ {
+ QueryPerformanceCounter( &t->start );
+ return( 0 );
+ }
+ else
+ {
+ unsigned long delta;
+ LARGE_INTEGER now, hfreq;
+ QueryPerformanceCounter( &now );
+ QueryPerformanceFrequency( &hfreq );
+ delta = (unsigned long)( ( now.QuadPart - t->start.QuadPart ) * 1000ul
+ / hfreq.QuadPart );
+ return( delta );
+ }
+}
+
+/* It's OK to use a global because alarm() is supposed to be global anyway */
+static DWORD alarmMs;
+
+static void TimerProc( void *TimerContext )
+{
+ (void) TimerContext;
+ Sleep( alarmMs );
+ mbedtls_timing_alarmed = 1;
+ /* _endthread will be called implicitly on return
+ * That ensures execution of thread funcition's epilogue */
+}
+
+void mbedtls_set_alarm( int seconds )
+{
+ if( seconds == 0 )
+ {
+ /* No need to create a thread for this simple case.
+ * Also, this shorcut is more reliable at least on MinGW32 */
+ mbedtls_timing_alarmed = 1;
+ return;
+ }
+
+ mbedtls_timing_alarmed = 0;
+ alarmMs = seconds * 1000;
+ (void) _beginthread( TimerProc, 0, NULL );
+}
+
+#else /* _WIN32 && !EFIX64 && !EFI32 */
+
+unsigned long mbedtls_timing_get_timer( struct mbedtls_timing_hr_time *val, int reset )
+{
+ struct _hr_time *t = (struct _hr_time *) val;
+
+ if( reset )
+ {
+ gettimeofday( &t->start, NULL );
+ return( 0 );
+ }
+ else
+ {
+ unsigned long delta;
+ struct timeval now;
+ gettimeofday( &now, NULL );
+ delta = ( now.tv_sec - t->start.tv_sec ) * 1000ul
+ + ( now.tv_usec - t->start.tv_usec ) / 1000;
+ return( delta );
+ }
+}
+
+static void sighandler( int signum )
+{
+ mbedtls_timing_alarmed = 1;
+ signal( signum, sighandler );
+}
+
+void mbedtls_set_alarm( int seconds )
+{
+ mbedtls_timing_alarmed = 0;
+ signal( SIGALRM, sighandler );
+ alarm( seconds );
+ if( seconds == 0 )
+ {
+ /* alarm(0) cancelled any previous pending alarm, but the
+ handler won't fire, so raise the flag straight away. */
+ mbedtls_timing_alarmed = 1;
+ }
+}
+
+#endif /* _WIN32 && !EFIX64 && !EFI32 */
+
+/*
+ * Set delays to watch
+ */
+void mbedtls_timing_set_delay( void *data, uint32_t int_ms, uint32_t fin_ms )
+{
+ mbedtls_timing_delay_context *ctx = (mbedtls_timing_delay_context *) data;
+
+ ctx->int_ms = int_ms;
+ ctx->fin_ms = fin_ms;
+
+ if( fin_ms != 0 )
+ (void) mbedtls_timing_get_timer( &ctx->timer, 1 );
+}
+
+/*
+ * Get number of delays expired
+ */
+int mbedtls_timing_get_delay( void *data )
+{
+ mbedtls_timing_delay_context *ctx = (mbedtls_timing_delay_context *) data;
+ unsigned long elapsed_ms;
+
+ if( ctx->fin_ms == 0 )
+ return( -1 );
+
+ elapsed_ms = mbedtls_timing_get_timer( &ctx->timer, 0 );
+
+ if( elapsed_ms >= ctx->fin_ms )
+ return( 2 );
+
+ if( elapsed_ms >= ctx->int_ms )
+ return( 1 );
+
+ return( 0 );
+}
+
+#endif /* !MBEDTLS_TIMING_ALT */
+
+#if defined(MBEDTLS_SELF_TEST)
+
+/*
+ * Busy-waits for the given number of milliseconds.
+ * Used for testing mbedtls_timing_hardclock.
+ */
+static void busy_msleep( unsigned long msec )
+{
+ struct mbedtls_timing_hr_time hires;
+ unsigned long i = 0; /* for busy-waiting */
+ volatile unsigned long j; /* to prevent optimisation */
+
+ (void) mbedtls_timing_get_timer( &hires, 1 );
+
+ while( mbedtls_timing_get_timer( &hires, 0 ) < msec )
+ i++;
+
+ j = i;
+ (void) j;
+}
+
+#define FAIL do \
+ { \
+ if( verbose != 0 ) \
+ { \
+ mbedtls_printf( "failed at line %d\n", __LINE__ ); \
+ mbedtls_printf( " cycles=%lu ratio=%lu millisecs=%lu secs=%lu hardfail=%d a=%lu b=%lu\n", \
+ cycles, ratio, millisecs, secs, hardfail, \
+ (unsigned long) a, (unsigned long) b ); \
+ mbedtls_printf( " elapsed(hires)=%lu elapsed(ctx)=%lu status(ctx)=%d\n", \
+ mbedtls_timing_get_timer( &hires, 0 ), \
+ mbedtls_timing_get_timer( &ctx.timer, 0 ), \
+ mbedtls_timing_get_delay( &ctx ) ); \
+ } \
+ return( 1 ); \
+ } while( 0 )
+
+/*
+ * Checkup routine
+ *
+ * Warning: this is work in progress, some tests may not be reliable enough
+ * yet! False positives may happen.
+ */
+int mbedtls_timing_self_test( int verbose )
+{
+ unsigned long cycles = 0, ratio = 0;
+ unsigned long millisecs = 0, secs = 0;
+ int hardfail = 0;
+ struct mbedtls_timing_hr_time hires;
+ uint32_t a = 0, b = 0;
+ mbedtls_timing_delay_context ctx;
+
+ if( verbose != 0 )
+ mbedtls_printf( " TIMING tests note: will take some time!\n" );
+
+ if( verbose != 0 )
+ mbedtls_printf( " TIMING test #1 (set_alarm / get_timer): " );
+
+ {
+ secs = 1;
+
+ (void) mbedtls_timing_get_timer( &hires, 1 );
+
+ mbedtls_set_alarm( (int) secs );
+ while( !mbedtls_timing_alarmed )
+ ;
+
+ millisecs = mbedtls_timing_get_timer( &hires, 0 );
+
+ /* For some reason on Windows it looks like alarm has an extra delay
+ * (maybe related to creating a new thread). Allow some room here. */
+ if( millisecs < 800 * secs || millisecs > 1200 * secs + 300 )
+ FAIL;
+ }
+
+ if( verbose != 0 )
+ mbedtls_printf( "passed\n" );
+
+ if( verbose != 0 )
+ mbedtls_printf( " TIMING test #2 (set/get_delay ): " );
+
+ {
+ a = 800;
+ b = 400;
+ mbedtls_timing_set_delay( &ctx, a, a + b ); /* T = 0 */
+
+ busy_msleep( a - a / 4 ); /* T = a - a/4 */
+ if( mbedtls_timing_get_delay( &ctx ) != 0 )
+ FAIL;
+
+ busy_msleep( a / 4 + b / 4 ); /* T = a + b/4 */
+ if( mbedtls_timing_get_delay( &ctx ) != 1 )
+ FAIL;
+
+ busy_msleep( b ); /* T = a + b + b/4 */
+ if( mbedtls_timing_get_delay( &ctx ) != 2 )
+ FAIL;
+ }
+
+ mbedtls_timing_set_delay( &ctx, 0, 0 );
+ busy_msleep( 200 );
+ if( mbedtls_timing_get_delay( &ctx ) != -1 )
+ FAIL;
+
+ if( verbose != 0 )
+ mbedtls_printf( "passed\n" );
+
+ if( verbose != 0 )
+ mbedtls_printf( " TIMING test #3 (hardclock / get_timer): " );
+
+ /*
+ * Allow one failure for possible counter wrapping.
+ * On a 4Ghz 32-bit machine the cycle counter wraps about once per second;
+ * since the whole test is about 10ms, it shouldn't happen twice in a row.
+ */
+
+hard_test:
+ if( hardfail > 1 )
+ {
+ if( verbose != 0 )
+ mbedtls_printf( "failed (ignored)\n" );
+
+ goto hard_test_done;
+ }
+
+ /* Get a reference ratio cycles/ms */
+ millisecs = 1;
+ cycles = mbedtls_timing_hardclock();
+ busy_msleep( millisecs );
+ cycles = mbedtls_timing_hardclock() - cycles;
+ ratio = cycles / millisecs;
+
+ /* Check that the ratio is mostly constant */
+ for( millisecs = 2; millisecs <= 4; millisecs++ )
+ {
+ cycles = mbedtls_timing_hardclock();
+ busy_msleep( millisecs );
+ cycles = mbedtls_timing_hardclock() - cycles;
+
+ /* Allow variation up to 20% */
+ if( cycles / millisecs < ratio - ratio / 5 ||
+ cycles / millisecs > ratio + ratio / 5 )
+ {
+ hardfail++;
+ goto hard_test;
+ }
+ }
+
+ if( verbose != 0 )
+ mbedtls_printf( "passed\n" );
+
+hard_test_done:
+
+ if( verbose != 0 )
+ mbedtls_printf( "\n" );
+
+ return( 0 );
+}
+
+#endif /* MBEDTLS_SELF_TEST */
+
+#endif /* MBEDTLS_TIMING_C */
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