crypto/cryptlib.c - platform/external/openssl.git - Git at Google

 /*
  * Copyright 1998-2019 The OpenSSL Project Authors. All Rights Reserved.
  * Copyright (c) 2002, Oracle and/or its affiliates. All rights reserved
  *
  * Licensed under the OpenSSL license (the "License").  You may not use
  * this file except in compliance with the License.  You can obtain a copy
  * in the file LICENSE in the source distribution or at
  * https://www.openssl.org/source/license.html
  */

 #include "e_os.h"
 #include "crypto/cryptlib.h"
 #include <openssl/safestack.h>

 #if     defined(__i386)   || defined(__i386__)   || defined(_M_IX86) || \
         defined(__x86_64) || defined(__x86_64__) || \
         defined(_M_AMD64) || defined(_M_X64)

 extern unsigned int OPENSSL_ia32cap_P[4];

 # if defined(OPENSSL_CPUID_OBJ) && !defined(OPENSSL_NO_ASM) && !defined(I386_ONLY)

 /*
  * Purpose of these minimalistic and character-type-agnostic subroutines
  * is to break dependency on MSVCRT (on Windows) and locale. This makes
  * OPENSSL_cpuid_setup safe to use as "constructor". "Character-type-
  * agnostic" means that they work with either wide or 8-bit characters,
  * exploiting the fact that first 127 characters can be simply casted
  * between the sets, while the rest would be simply rejected by ossl_is*
  * subroutines.
  */
 #  ifdef _WIN32
 typedef WCHAR variant_char;

 static variant_char *ossl_getenv(const char *name)
 {
     /*
      * Since we pull only one environment variable, it's simpler to
      * to just ignore |name| and use equivalent wide-char L-literal.
      * As well as to ignore excessively long values...
      */
     static WCHAR value[48];
     DWORD len = GetEnvironmentVariableW(L"OPENSSL_ia32cap", value, 48);

     return (len > 0 && len < 48) ? value : NULL;
 }
 #  else
 typedef char variant_char;
 #   define ossl_getenv getenv
 #  endif

 #  include "crypto/ctype.h"

 static int todigit(variant_char c)
 {
     if (ossl_isdigit(c))
         return c - '0';
     else if (ossl_isxdigit(c))
         return ossl_tolower(c) - 'a' + 10;

     /* return largest base value to make caller terminate the loop */
     return 16;
 }

 static uint64_t ossl_strtouint64(const variant_char *str)
 {
     uint64_t ret = 0;
     unsigned int digit, base = 10;

     if (*str == '0') {
         base = 8, str++;
         if (ossl_tolower(*str) == 'x')
             base = 16, str++;
     }

     while((digit = todigit(*str++)) < base)
         ret = ret * base + digit;

     return ret;
 }

 static variant_char *ossl_strchr(const variant_char *str, char srch)
 {   variant_char c;

     while((c = *str)) {
         if (c == srch)
 	    return (variant_char *)str;
         str++;
     }

     return NULL;
 }

 #  define OPENSSL_CPUID_SETUP
 typedef uint64_t IA32CAP;

 void OPENSSL_cpuid_setup(void)
 {
     static int trigger = 0;
     IA32CAP OPENSSL_ia32_cpuid(unsigned int *);
     IA32CAP vec;
     const variant_char *env;

     if (trigger)
         return;

     trigger = 1;
     if ((env = ossl_getenv("OPENSSL_ia32cap")) != NULL) {
         int off = (env[0] == '~') ? 1 : 0;

         vec = ossl_strtouint64(env + off);

         if (off) {
             IA32CAP mask = vec;
             vec = OPENSSL_ia32_cpuid(OPENSSL_ia32cap_P) & ~mask;
             if (mask & (1<<24)) {
                 /*
                  * User disables FXSR bit, mask even other capabilities
                  * that operate exclusively on XMM, so we don't have to
                  * double-check all the time. We mask PCLMULQDQ, AMD XOP,
                  * AES-NI and AVX. Formally speaking we don't have to
                  * do it in x86_64 case, but we can safely assume that
                  * x86_64 users won't actually flip this flag.
                  */
                 vec &= ~((IA32CAP)(1<<1|1<<11|1<<25|1<<28) << 32);
             }
         } else if (env[0] == ':') {
             vec = OPENSSL_ia32_cpuid(OPENSSL_ia32cap_P);
         }

         if ((env = ossl_strchr(env, ':')) != NULL) {
             IA32CAP vecx;

             env++;
             off = (env[0] == '~') ? 1 : 0;
             vecx = ossl_strtouint64(env + off);
             if (off) {
                 OPENSSL_ia32cap_P[2] &= ~(unsigned int)vecx;
                 OPENSSL_ia32cap_P[3] &= ~(unsigned int)(vecx >> 32);
             } else {
                 OPENSSL_ia32cap_P[2] = (unsigned int)vecx;
                 OPENSSL_ia32cap_P[3] = (unsigned int)(vecx >> 32);
             }
         } else {
             OPENSSL_ia32cap_P[2] = 0;
             OPENSSL_ia32cap_P[3] = 0;
         }
     } else {
         vec = OPENSSL_ia32_cpuid(OPENSSL_ia32cap_P);
     }

     /*
      * |(1<<10) sets a reserved bit to signal that variable
      * was initialized already... This is to avoid interference
      * with cpuid snippets in ELF .init segment.
      */
     OPENSSL_ia32cap_P[0] = (unsigned int)vec | (1 << 10);
     OPENSSL_ia32cap_P[1] = (unsigned int)(vec >> 32);
 }
 # else
 unsigned int OPENSSL_ia32cap_P[4];
 # endif
 #endif
 #if !defined(OPENSSL_CPUID_SETUP) && !defined(OPENSSL_CPUID_OBJ)
 void OPENSSL_cpuid_setup(void)
 {
 }
 #endif

 #if defined(_WIN32)
 # include <tchar.h>
 # include <signal.h>
 # ifdef __WATCOMC__
 #  if defined(_UNICODE) || defined(__UNICODE__)
 #   define _vsntprintf _vsnwprintf
 #  else
 #   define _vsntprintf _vsnprintf
 #  endif
 # endif
 # ifdef _MSC_VER
 #  define alloca _alloca
 # endif

 # if defined(_WIN32_WINNT) && _WIN32_WINNT>=0x0333
 #  ifdef OPENSSL_SYS_WIN_CORE

 int OPENSSL_isservice(void)
 {
     /* OneCore API cannot interact with GUI */
     return 1;
 }
 #  else
 int OPENSSL_isservice(void)
 {
     HWINSTA h;
     DWORD len;
     WCHAR *name;
     static union {
         void *p;
         FARPROC f;
     } _OPENSSL_isservice = {
         NULL
     };

     if (_OPENSSL_isservice.p == NULL) {
         HANDLE mod = GetModuleHandle(NULL);
         FARPROC f = NULL;

         if (mod != NULL)
             f = GetProcAddress(mod, "_OPENSSL_isservice");
         if (f == NULL)
             _OPENSSL_isservice.p = (void *)-1;
         else
             _OPENSSL_isservice.f = f;
     }

     if (_OPENSSL_isservice.p != (void *)-1)
         return (*_OPENSSL_isservice.f) ();

     h = GetProcessWindowStation();
     if (h == NULL)
         return -1;

     if (GetUserObjectInformationW(h, UOI_NAME, NULL, 0, &len) ||
         GetLastError() != ERROR_INSUFFICIENT_BUFFER)
         return -1;

     if (len > 512)
         return -1;              /* paranoia */
     len++, len &= ~1;           /* paranoia */
     name = (WCHAR *)alloca(len + sizeof(WCHAR));
     if (!GetUserObjectInformationW(h, UOI_NAME, name, len, &len))
         return -1;

     len++, len &= ~1;           /* paranoia */
     name[len / sizeof(WCHAR)] = L'\0'; /* paranoia */
 #   if 1
     /*
      * This doesn't cover "interactive" services [working with real
      * WinSta0's] nor programs started non-interactively by Task Scheduler
      * [those are working with SAWinSta].
      */
     if (wcsstr(name, L"Service-0x"))
         return 1;
 #   else
     /* This covers all non-interactive programs such as services. */
     if (!wcsstr(name, L"WinSta0"))
         return 1;
 #   endif
     else
         return 0;
 }
 #  endif
 # else
 int OPENSSL_isservice(void)
 {
     return 0;
 }
 # endif

 void OPENSSL_showfatal(const char *fmta, ...)
 {
     va_list ap;
     TCHAR buf[256];
     const TCHAR *fmt;
     /*
      * First check if it's a console application, in which case the
      * error message would be printed to standard error.
      * Windows CE does not have a concept of a console application,
      * so we need to guard the check.
      */
 # ifdef STD_ERROR_HANDLE
     HANDLE h;

     if ((h = GetStdHandle(STD_ERROR_HANDLE)) != NULL &&
         GetFileType(h) != FILE_TYPE_UNKNOWN) {
         /* must be console application */
         int len;
         DWORD out;

         va_start(ap, fmta);
         len = _vsnprintf((char *)buf, sizeof(buf), fmta, ap);
         WriteFile(h, buf, len < 0 ? sizeof(buf) : (DWORD) len, &out, NULL);
         va_end(ap);
         return;
     }
 # endif

     if (sizeof(TCHAR) == sizeof(char))
         fmt = (const TCHAR *)fmta;
     else
         do {
             int keepgoing;
             size_t len_0 = strlen(fmta) + 1, i;
             WCHAR *fmtw;

             fmtw = (WCHAR *)alloca(len_0 * sizeof(WCHAR));
             if (fmtw == NULL) {
                 fmt = (const TCHAR *)L"no stack?";
                 break;
             }
             if (!MultiByteToWideChar(CP_ACP, 0, fmta, len_0, fmtw, len_0))
                 for (i = 0; i < len_0; i++)
                     fmtw[i] = (WCHAR)fmta[i];
             for (i = 0; i < len_0; i++) {
                 if (fmtw[i] == L'%')
                     do {
                         keepgoing = 0;
                         switch (fmtw[i + 1]) {
                         case L'0':
                         case L'1':
                         case L'2':
                         case L'3':
                         case L'4':
                         case L'5':
                         case L'6':
                         case L'7':
                         case L'8':
                         case L'9':
                         case L'.':
                         case L'*':
                         case L'-':
                             i++;
                             keepgoing = 1;
                             break;
                         case L's':
                             fmtw[i + 1] = L'S';
                             break;
                         case L'S':
                             fmtw[i + 1] = L's';
                             break;
                         case L'c':
                             fmtw[i + 1] = L'C';
                             break;
                         case L'C':
                             fmtw[i + 1] = L'c';
                             break;
                         }
                     } while (keepgoing);
             }
             fmt = (const TCHAR *)fmtw;
         } while (0);

     va_start(ap, fmta);
     _vsntprintf(buf, OSSL_NELEM(buf) - 1, fmt, ap);
     buf[OSSL_NELEM(buf) - 1] = _T('\0');
     va_end(ap);

 # if defined(_WIN32_WINNT) && _WIN32_WINNT>=0x0333
 #  ifdef OPENSSL_SYS_WIN_CORE
     /* ONECORE is always NONGUI and NT >= 0x0601 */

     /*
     * TODO: (For non GUI and no std error cases)
     * Add event logging feature here.
     */

 #   if !defined(NDEBUG)
         /*
         * We are in a situation where we tried to report a critical
         * error and this failed for some reason. As a last resort,
         * in debug builds, send output to the debugger or any other
         * tool like DebugView which can monitor the output.
         */
         OutputDebugString(buf);
 #   endif
 #  else
     /* this -------------v--- guards NT-specific calls */
     if (check_winnt() && OPENSSL_isservice() > 0) {
         HANDLE hEventLog = RegisterEventSource(NULL, _T("OpenSSL"));

         if (hEventLog != NULL) {
             const TCHAR *pmsg = buf;

             if (!ReportEvent(hEventLog, EVENTLOG_ERROR_TYPE, 0, 0, NULL,
                              1, 0, &pmsg, NULL)) {
 #   if !defined(NDEBUG)
                 /*
                  * We are in a situation where we tried to report a critical
                  * error and this failed for some reason. As a last resort,
                  * in debug builds, send output to the debugger or any other
                  * tool like DebugView which can monitor the output.
                  */
                 OutputDebugString(pmsg);
 #   endif
             }

             (void)DeregisterEventSource(hEventLog);
         }
     } else {
         MessageBox(NULL, buf, _T("OpenSSL: FATAL"), MB_OK | MB_ICONERROR);
     }
 #  endif
 # else
     MessageBox(NULL, buf, _T("OpenSSL: FATAL"), MB_OK | MB_ICONERROR);
 # endif
 }
 #else
 void OPENSSL_showfatal(const char *fmta, ...)
 {
 #ifndef OPENSSL_NO_STDIO
     va_list ap;

     va_start(ap, fmta);
     vfprintf(stderr, fmta, ap);
     va_end(ap);
 #endif
 }

 int OPENSSL_isservice(void)
 {
     return 0;
 }
 #endif

 void OPENSSL_die(const char *message, const char *file, int line)
 {
     OPENSSL_showfatal("%s:%d: OpenSSL internal error: %s\n",
                       file, line, message);
 #if !defined(_WIN32)
     abort();
 #else
     /*
      * Win32 abort() customarily shows a dialog, but we just did that...
      */
 # if !defined(_WIN32_WCE)
     raise(SIGABRT);
 # endif
     _exit(3);
 #endif
 }

 #if !defined(OPENSSL_CPUID_OBJ)
 /*
  * The volatile is used to to ensure that the compiler generates code that reads
  * all values from the array and doesn't try to optimize this away. The standard
  * doesn't actually require this behavior if the original data pointed to is
  * not volatile, but compilers do this in practice anyway.
  *
  * There are also assembler versions of this function.
  */
 # undef CRYPTO_memcmp
 int CRYPTO_memcmp(const void * in_a, const void * in_b, size_t len)
 {
     size_t i;
     const volatile unsigned char *a = in_a;
     const volatile unsigned char *b = in_b;
     unsigned char x = 0;

     for (i = 0; i < len; i++)
         x |= a[i] ^ b[i];

     return x;
 }

 /*
  * For systems that don't provide an instruction counter register or equivalent.
  */
 uint32_t OPENSSL_rdtsc(void)
 {
     return 0;
 }

 size_t OPENSSL_instrument_bus(unsigned int *out, size_t cnt)
 {
     return 0;
 }

 size_t OPENSSL_instrument_bus2(unsigned int *out, size_t cnt, size_t max)
 {
     return 0;
 }
 #endif
	/*
	* Copyright 1998-2019 The OpenSSL Project Authors. All Rights Reserved.
	* Copyright (c) 2002, Oracle and/or its affiliates. All rights reserved
	*
	* Licensed under the OpenSSL license (the "License"). You may not use
	* this file except in compliance with the License. You can obtain a copy
	* in the file LICENSE in the source distribution or at
	* https://www.openssl.org/source/license.html
	*/

	#include "e_os.h"
	#include "crypto/cryptlib.h"
	#include <openssl/safestack.h>

	#if defined(__i386) \|\| defined(__i386__) \|\| defined(_M_IX86) \|\| \
	defined(__x86_64) \|\| defined(__x86_64__) \|\| \
	defined(_M_AMD64) \|\| defined(_M_X64)

	extern unsigned int OPENSSL_ia32cap_P[4];

	# if defined(OPENSSL_CPUID_OBJ) && !defined(OPENSSL_NO_ASM) && !defined(I386_ONLY)

	/*
	* Purpose of these minimalistic and character-type-agnostic subroutines
	* is to break dependency on MSVCRT (on Windows) and locale. This makes
	* OPENSSL_cpuid_setup safe to use as "constructor". "Character-type-
	* agnostic" means that they work with either wide or 8-bit characters,
	* exploiting the fact that first 127 characters can be simply casted
	* between the sets, while the rest would be simply rejected by ossl_is*
	* subroutines.
	*/
	# ifdef _WIN32
	typedef WCHAR variant_char;

	static variant_char ossl_getenv(const char name)
	{
	/*
	* Since we pull only one environment variable, it's simpler to
	* to just ignore \|name\| and use equivalent wide-char L-literal.
	* As well as to ignore excessively long values...
	*/
	static WCHAR value[48];
	DWORD len = GetEnvironmentVariableW(L"OPENSSL_ia32cap", value, 48);

	return (len > 0 && len < 48) ? value : NULL;
	}
	# else
	typedef char variant_char;
	# define ossl_getenv getenv
	# endif

	# include "crypto/ctype.h"

	static int todigit(variant_char c)
	{
	if (ossl_isdigit(c))
	return c - '0';
	else if (ossl_isxdigit(c))
	return ossl_tolower(c) - 'a' + 10;

	/* return largest base value to make caller terminate the loop */
	return 16;
	}

	static uint64_t ossl_strtouint64(const variant_char *str)
	{
	uint64_t ret = 0;
	unsigned int digit, base = 10;

	if (*str == '0') {
	base = 8, str++;
	if (ossl_tolower(*str) == 'x')
	base = 16, str++;
	}

	while((digit = todigit(*str++)) < base)
	ret = ret * base + digit;

	return ret;
	}

	static variant_char ossl_strchr(const variant_char str, char srch)
	{ variant_char c;

	while((c = *str)) {
	if (c == srch)
	return (variant_char *)str;
	str++;
	}

	return NULL;
	}

	# define OPENSSL_CPUID_SETUP
	typedef uint64_t IA32CAP;

	void OPENSSL_cpuid_setup(void)
	{
	static int trigger = 0;
	IA32CAP OPENSSL_ia32_cpuid(unsigned int *);
	IA32CAP vec;
	const variant_char *env;

	if (trigger)
	return;

	trigger = 1;
	if ((env = ossl_getenv("OPENSSL_ia32cap")) != NULL) {
	int off = (env[0] == '~') ? 1 : 0;

	vec = ossl_strtouint64(env + off);

	if (off) {
	IA32CAP mask = vec;
	vec = OPENSSL_ia32_cpuid(OPENSSL_ia32cap_P) & ~mask;
	if (mask & (1<<24)) {
	/*
	* User disables FXSR bit, mask even other capabilities
	* that operate exclusively on XMM, so we don't have to
	* double-check all the time. We mask PCLMULQDQ, AMD XOP,
	* AES-NI and AVX. Formally speaking we don't have to
	* do it in x86_64 case, but we can safely assume that
	* x86_64 users won't actually flip this flag.
	*/
	vec &= ~((IA32CAP)(1<<1\|1<<11\|1<<25\|1<<28) << 32);
	}
	} else if (env[0] == ':') {
	vec = OPENSSL_ia32_cpuid(OPENSSL_ia32cap_P);
	}

	if ((env = ossl_strchr(env, ':')) != NULL) {
	IA32CAP vecx;

	env++;
	off = (env[0] == '~') ? 1 : 0;
	vecx = ossl_strtouint64(env + off);
	if (off) {
	OPENSSL_ia32cap_P[2] &= ~(unsigned int)vecx;
	OPENSSL_ia32cap_P[3] &= ~(unsigned int)(vecx >> 32);
	} else {
	OPENSSL_ia32cap_P[2] = (unsigned int)vecx;
	OPENSSL_ia32cap_P[3] = (unsigned int)(vecx >> 32);
	}
	} else {
	OPENSSL_ia32cap_P[2] = 0;
	OPENSSL_ia32cap_P[3] = 0;
	}
	} else {
	vec = OPENSSL_ia32_cpuid(OPENSSL_ia32cap_P);
	}

	/*
	* \|(1<<10) sets a reserved bit to signal that variable
	* was initialized already... This is to avoid interference
	* with cpuid snippets in ELF .init segment.
	*/
	OPENSSL_ia32cap_P[0] = (unsigned int)vec \| (1 << 10);
	OPENSSL_ia32cap_P[1] = (unsigned int)(vec >> 32);
	}
	# else
	unsigned int OPENSSL_ia32cap_P[4];
	# endif
	#endif
	#if !defined(OPENSSL_CPUID_SETUP) && !defined(OPENSSL_CPUID_OBJ)
	void OPENSSL_cpuid_setup(void)
	{
	}
	#endif

	#if defined(_WIN32)
	# include <tchar.h>
	# include <signal.h>
	# ifdef __WATCOMC__
	# if defined(_UNICODE) \|\| defined(__UNICODE__)
	# define _vsntprintf _vsnwprintf
	# else
	# define _vsntprintf _vsnprintf
	# endif
	# endif
	# ifdef _MSC_VER
	# define alloca _alloca
	# endif

	# if defined(_WIN32_WINNT) && _WIN32_WINNT>=0x0333
	# ifdef OPENSSL_SYS_WIN_CORE

	int OPENSSL_isservice(void)
	{
	/* OneCore API cannot interact with GUI */
	return 1;
	}
	# else
	int OPENSSL_isservice(void)
	{
	HWINSTA h;
	DWORD len;
	WCHAR *name;
	static union {
	void *p;
	FARPROC f;
	} _OPENSSL_isservice = {
	NULL
	};

	if (_OPENSSL_isservice.p == NULL) {
	HANDLE mod = GetModuleHandle(NULL);
	FARPROC f = NULL;

	if (mod != NULL)
	f = GetProcAddress(mod, "_OPENSSL_isservice");
	if (f == NULL)
	_OPENSSL_isservice.p = (void *)-1;
	else
	_OPENSSL_isservice.f = f;
	}

	if (_OPENSSL_isservice.p != (void *)-1)
	return (*_OPENSSL_isservice.f) ();

	h = GetProcessWindowStation();
	if (h == NULL)
	return -1;

	if (GetUserObjectInformationW(h, UOI_NAME, NULL, 0, &len) \|\|
	GetLastError() != ERROR_INSUFFICIENT_BUFFER)
	return -1;

	if (len > 512)
	return -1; /* paranoia */
	len++, len &= ~1; /* paranoia */
	name = (WCHAR *)alloca(len + sizeof(WCHAR));
	if (!GetUserObjectInformationW(h, UOI_NAME, name, len, &len))
	return -1;

	len++, len &= ~1; /* paranoia */
	name[len / sizeof(WCHAR)] = L'\0'; /* paranoia */
	# if 1
	/*
	* This doesn't cover "interactive" services [working with real
	* WinSta0's] nor programs started non-interactively by Task Scheduler
	* [those are working with SAWinSta].
	*/
	if (wcsstr(name, L"Service-0x"))
	return 1;
	# else
	/* This covers all non-interactive programs such as services. */
	if (!wcsstr(name, L"WinSta0"))
	return 1;
	# endif
	else
	return 0;
	}
	# endif
	# else
	int OPENSSL_isservice(void)
	{
	return 0;
	}
	# endif

	void OPENSSL_showfatal(const char *fmta, ...)
	{
	va_list ap;
	TCHAR buf[256];
	const TCHAR *fmt;
	/*
	* First check if it's a console application, in which case the
	* error message would be printed to standard error.
	* Windows CE does not have a concept of a console application,
	* so we need to guard the check.
	*/
	# ifdef STD_ERROR_HANDLE
	HANDLE h;

	if ((h = GetStdHandle(STD_ERROR_HANDLE)) != NULL &&
	GetFileType(h) != FILE_TYPE_UNKNOWN) {
	/* must be console application */
	int len;
	DWORD out;

	va_start(ap, fmta);
	len = _vsnprintf((char *)buf, sizeof(buf), fmta, ap);
	WriteFile(h, buf, len < 0 ? sizeof(buf) : (DWORD) len, &out, NULL);
	va_end(ap);
	return;
	}
	# endif

	if (sizeof(TCHAR) == sizeof(char))
	fmt = (const TCHAR *)fmta;
	else
	do {
	int keepgoing;
	size_t len_0 = strlen(fmta) + 1, i;
	WCHAR *fmtw;

	fmtw = (WCHAR )alloca(len_0 sizeof(WCHAR));
	if (fmtw == NULL) {
	fmt = (const TCHAR *)L"no stack?";
	break;
	}
	if (!MultiByteToWideChar(CP_ACP, 0, fmta, len_0, fmtw, len_0))
	for (i = 0; i < len_0; i++)
	fmtw[i] = (WCHAR)fmta[i];
	for (i = 0; i < len_0; i++) {
	if (fmtw[i] == L'%')
	do {
	keepgoing = 0;
	switch (fmtw[i + 1]) {
	case L'0':
	case L'1':
	case L'2':
	case L'3':
	case L'4':
	case L'5':
	case L'6':
	case L'7':
	case L'8':
	case L'9':
	case L'.':
	case L'*':
	case L'-':
	i++;
	keepgoing = 1;
	break;
	case L's':
	fmtw[i + 1] = L'S';
	break;
	case L'S':
	fmtw[i + 1] = L's';
	break;
	case L'c':
	fmtw[i + 1] = L'C';
	break;
	case L'C':
	fmtw[i + 1] = L'c';
	break;
	}
	} while (keepgoing);
	}
	fmt = (const TCHAR *)fmtw;
	} while (0);

	va_start(ap, fmta);
	_vsntprintf(buf, OSSL_NELEM(buf) - 1, fmt, ap);
	buf[OSSL_NELEM(buf) - 1] = _T('\0');
	va_end(ap);

	# if defined(_WIN32_WINNT) && _WIN32_WINNT>=0x0333
	# ifdef OPENSSL_SYS_WIN_CORE
	/* ONECORE is always NONGUI and NT >= 0x0601 */

	/*
	* TODO: (For non GUI and no std error cases)
	* Add event logging feature here.
	*/

	# if !defined(NDEBUG)
	/*
	* We are in a situation where we tried to report a critical
	* error and this failed for some reason. As a last resort,
	* in debug builds, send output to the debugger or any other
	* tool like DebugView which can monitor the output.
	*/
	OutputDebugString(buf);
	# endif
	# else
	/* this -------------v--- guards NT-specific calls */
	if (check_winnt() && OPENSSL_isservice() > 0) {
	HANDLE hEventLog = RegisterEventSource(NULL, _T("OpenSSL"));

	if (hEventLog != NULL) {
	const TCHAR *pmsg = buf;

	if (!ReportEvent(hEventLog, EVENTLOG_ERROR_TYPE, 0, 0, NULL,
	1, 0, &pmsg, NULL)) {
	# if !defined(NDEBUG)
	/*
	* We are in a situation where we tried to report a critical
	* error and this failed for some reason. As a last resort,
	* in debug builds, send output to the debugger or any other
	* tool like DebugView which can monitor the output.
	*/
	OutputDebugString(pmsg);
	# endif
	}

	(void)DeregisterEventSource(hEventLog);
	}
	} else {
	MessageBox(NULL, buf, _T("OpenSSL: FATAL"), MB_OK \| MB_ICONERROR);
	}
	# endif
	# else
	MessageBox(NULL, buf, _T("OpenSSL: FATAL"), MB_OK \| MB_ICONERROR);
	# endif
	}
	#else
	void OPENSSL_showfatal(const char *fmta, ...)
	{
	#ifndef OPENSSL_NO_STDIO
	va_list ap;

	va_start(ap, fmta);
	vfprintf(stderr, fmta, ap);
	va_end(ap);
	#endif
	}

	int OPENSSL_isservice(void)
	{
	return 0;
	}
	#endif

	void OPENSSL_die(const char message, const char file, int line)
	{
	OPENSSL_showfatal("%s:%d: OpenSSL internal error: %s\n",
	file, line, message);
	#if !defined(_WIN32)
	abort();
	#else
	/*
	* Win32 abort() customarily shows a dialog, but we just did that...
	*/
	# if !defined(_WIN32_WCE)
	raise(SIGABRT);
	# endif
	_exit(3);
	#endif
	}

	#if !defined(OPENSSL_CPUID_OBJ)
	/*
	* The volatile is used to to ensure that the compiler generates code that reads
	* all values from the array and doesn't try to optimize this away. The standard
	* doesn't actually require this behavior if the original data pointed to is
	* not volatile, but compilers do this in practice anyway.
	*
	* There are also assembler versions of this function.
	*/
	# undef CRYPTO_memcmp
	int CRYPTO_memcmp(const void * in_a, const void * in_b, size_t len)
	{
	size_t i;
	const volatile unsigned char *a = in_a;
	const volatile unsigned char *b = in_b;
	unsigned char x = 0;

	for (i = 0; i < len; i++)
	x \|= a[i] ^ b[i];

	return x;
	}

	/*
	* For systems that don't provide an instruction counter register or equivalent.
	*/
	uint32_t OPENSSL_rdtsc(void)
	{
	return 0;
	}

	size_t OPENSSL_instrument_bus(unsigned int *out, size_t cnt)
	{
	return 0;
	}

	size_t OPENSSL_instrument_bus2(unsigned int *out, size_t cnt, size_t max)
	{
	return 0;
	}
	#endif