/* * High Resolution Timestamp Entropy Source * (C) 1999-2009,2011,2014 Jack Lloyd * * Distributed under the terms of the Botan license */ #include #include #include #if defined(BOTAN_TARGET_OS_HAS_QUERY_PERF_COUNTER) #include #undef min #undef max #endif #if defined(BOTAN_TARGET_OS_HAS_CLOCK_GETTIME) #include #endif namespace Botan { /* * Get the timestamp */ void High_Resolution_Timestamp::poll(Entropy_Accumulator& accum) { // Don't count any timestamps as contributing any entropy const double ESTIMATED_ENTROPY_PER_BYTE = 0.0; #if defined(BOTAN_TARGET_OS_HAS_CLOCK_GETTIME) #define CLOCK_GETTIME_POLL(src) \ do { \ struct timespec ts; \ ::clock_gettime(src, &ts); \ accum.add(&ts, sizeof(ts), ESTIMATED_ENTROPY_PER_BYTE); \ } while(0) #if defined(CLOCK_REALTIME) CLOCK_GETTIME_POLL(CLOCK_REALTIME); #endif #if defined(CLOCK_MONOTONIC) CLOCK_GETTIME_POLL(CLOCK_MONOTONIC); #endif #if defined(CLOCK_MONOTONIC_RAW) CLOCK_GETTIME_POLL(CLOCK_MONOTONIC_RAW); #endif #if defined(CLOCK_PROCESS_CPUTIME_ID) CLOCK_GETTIME_POLL(CLOCK_PROCESS_CPUTIME_ID); #endif #if defined(CLOCK_THREAD_CPUTIME_ID) CLOCK_GETTIME_POLL(CLOCK_THREAD_CPUTIME_ID); #endif #undef CLOCK_GETTIME_POLL #else #define STD_CHRONO_POLL(clock) \ do { \ auto timestamp = clock::now().time_since_epoch().count(); \ accum.add(timestamp, ESTIMATED_ENTROPY_PER_BYTE); \ } while(0) STD_CHRONO_POLL(std::chrono::high_resolution_clock); STD_CHRONO_POLL(std::chrono::system_clock); #undef STD_CHRONO_POLL #endif #if BOTAN_USE_GCC_INLINE_ASM u64bit rtc = 0; #if defined(BOTAN_TARGET_CPU_IS_X86_FAMILY) if(CPUID::has_rdtsc()) // not availble on all x86 CPUs { u32bit rtc_low = 0, rtc_high = 0; asm volatile("rdtsc" : "=d" (rtc_high), "=a" (rtc_low)); rtc = (static_cast(rtc_high) << 32) | rtc_low; } #elif defined(BOTAN_TARGET_CPU_IS_PPC_FAMILY) u32bit rtc_low = 0, rtc_high = 0; asm volatile("mftbu %0; mftb %1" : "=r" (rtc_high), "=r" (rtc_low)); rtc = (static_cast(rtc_high) << 32) | rtc_low; #elif defined(BOTAN_TARGET_ARCH_IS_ALPHA) asm volatile("rpcc %0" : "=r" (rtc)); #elif defined(BOTAN_TARGET_ARCH_IS_SPARC64) && !defined(BOTAN_TARGET_OS_IS_OPENBSD) asm volatile("rd %%tick, %0" : "=r" (rtc)); #elif defined(BOTAN_TARGET_ARCH_IS_IA64) asm volatile("mov %0=ar.itc" : "=r" (rtc)); #elif defined(BOTAN_TARGET_ARCH_IS_S390X) asm volatile("stck 0(%0)" : : "a" (&rtc) : "memory", "cc"); #elif defined(BOTAN_TARGET_ARCH_IS_HPPA) asm volatile("mfctl 16,%0" : "=r" (rtc)); // 64-bit only? #endif accum.add(rtc, ESTIMATED_ENTROPY_PER_BYTE); #endif #if defined(BOTAN_TARGET_OS_HAS_QUERY_PERF_COUNTER) { LARGE_INTEGER tv; ::QueryPerformanceCounter(&tv); accum.add(tv.QuadPart, ESTIMATED_ENTROPY_PER_BYTE); } #endif } }