1 | /*
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2 | * Copyright 1998-2016 The OpenSSL Project Authors. All Rights Reserved.
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3 | *
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4 | * Licensed under the OpenSSL license (the "License"). You may not use
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5 | * this file except in compliance with the License. You can obtain a copy
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6 | * in the file LICENSE in the source distribution or at
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7 | * https://www.openssl.org/source/license.html
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8 | */
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9 |
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10 | /* ====================================================================
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11 | * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
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12 | * ECDH support in OpenSSL originally developed by
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13 | * SUN MICROSYSTEMS, INC., and contributed to the OpenSSL project.
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14 | */
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15 |
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16 | #include "internal/cryptlib_int.h"
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17 | #include <openssl/safestack.h>
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18 |
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19 | #if defined(__i386) || defined(__i386__) || defined(_M_IX86) || \
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20 | defined(__x86_64) || defined(__x86_64__) || \
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21 | defined(_M_AMD64) || defined(_M_X64)
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22 |
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23 | extern unsigned int OPENSSL_ia32cap_P[4];
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24 |
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25 | # if defined(OPENSSL_CPUID_OBJ) && !defined(OPENSSL_NO_ASM) && !defined(I386_ONLY)
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26 | #include <stdio.h>
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27 | # define OPENSSL_CPUID_SETUP
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28 | typedef uint64_t IA32CAP;
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29 | void OPENSSL_cpuid_setup(void)
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30 | {
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31 | static int trigger = 0;
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32 | IA32CAP OPENSSL_ia32_cpuid(unsigned int *);
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33 | IA32CAP vec;
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34 | char *env;
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35 |
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36 | if (trigger)
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37 | return;
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38 |
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39 | trigger = 1;
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40 | if ((env = getenv("OPENSSL_ia32cap"))) {
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41 | int off = (env[0] == '~') ? 1 : 0;
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42 | # if defined(_WIN32)
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43 | if (!sscanf(env + off, "%I64i", &vec))
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44 | vec = strtoul(env + off, NULL, 0);
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45 | # else
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46 | if (!sscanf(env + off, "%lli", (long long *)&vec))
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47 | vec = strtoul(env + off, NULL, 0);
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48 | # endif
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49 | if (off)
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50 | vec = OPENSSL_ia32_cpuid(OPENSSL_ia32cap_P) & ~vec;
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51 | else if (env[0] == ':')
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52 | vec = OPENSSL_ia32_cpuid(OPENSSL_ia32cap_P);
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53 |
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54 | OPENSSL_ia32cap_P[2] = 0;
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55 | if ((env = strchr(env, ':'))) {
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56 | unsigned int vecx;
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57 | env++;
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58 | off = (env[0] == '~') ? 1 : 0;
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59 | vecx = strtoul(env + off, NULL, 0);
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60 | if (off)
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61 | OPENSSL_ia32cap_P[2] &= ~vecx;
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62 | else
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63 | OPENSSL_ia32cap_P[2] = vecx;
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64 | }
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65 | } else
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66 | vec = OPENSSL_ia32_cpuid(OPENSSL_ia32cap_P);
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67 |
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68 | /*
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69 | * |(1<<10) sets a reserved bit to signal that variable
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70 | * was initialized already... This is to avoid interference
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71 | * with cpuid snippets in ELF .init segment.
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72 | */
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73 | OPENSSL_ia32cap_P[0] = (unsigned int)vec | (1 << 10);
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74 | OPENSSL_ia32cap_P[1] = (unsigned int)(vec >> 32);
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75 | }
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76 | # else
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77 | unsigned int OPENSSL_ia32cap_P[4];
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78 | # endif
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79 | #endif
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80 | int OPENSSL_NONPIC_relocated = 0;
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81 | #if !defined(OPENSSL_CPUID_SETUP) && !defined(OPENSSL_CPUID_OBJ)
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82 | void OPENSSL_cpuid_setup(void)
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83 | {
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84 | }
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85 | #endif
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86 |
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87 | #if defined(_WIN32) && !defined(__CYGWIN__)
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88 | # include <tchar.h>
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89 | # include <signal.h>
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90 | # ifdef __WATCOMC__
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91 | # if defined(_UNICODE) || defined(__UNICODE__)
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92 | # define _vsntprintf _vsnwprintf
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93 | # else
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94 | # define _vsntprintf _vsnprintf
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95 | # endif
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96 | # endif
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97 | # ifdef _MSC_VER
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98 | # define alloca _alloca
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99 | # endif
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100 |
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101 | # if defined(_WIN32_WINNT) && _WIN32_WINNT>=0x0333
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102 | int OPENSSL_isservice(void)
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103 | {
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104 | HWINSTA h;
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105 | DWORD len;
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106 | WCHAR *name;
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107 | static union {
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108 | void *p;
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109 | FARPROC f;
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110 | } _OPENSSL_isservice = {
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111 | NULL
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112 | };
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113 |
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114 | if (_OPENSSL_isservice.p == NULL) {
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115 | HANDLE mod = GetModuleHandle(NULL);
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116 | if (mod != NULL)
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117 | _OPENSSL_isservice.f = GetProcAddress(mod, "_OPENSSL_isservice");
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118 | if (_OPENSSL_isservice.p == NULL)
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119 | _OPENSSL_isservice.p = (void *)-1;
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120 | }
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121 |
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122 | if (_OPENSSL_isservice.p != (void *)-1)
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123 | return (*_OPENSSL_isservice.f) ();
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124 |
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125 | h = GetProcessWindowStation();
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126 | if (h == NULL)
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127 | return -1;
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128 |
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129 | if (GetUserObjectInformationW(h, UOI_NAME, NULL, 0, &len) ||
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130 | GetLastError() != ERROR_INSUFFICIENT_BUFFER)
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131 | return -1;
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132 |
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133 | if (len > 512)
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134 | return -1; /* paranoia */
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135 | len++, len &= ~1; /* paranoia */
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136 | name = (WCHAR *)alloca(len + sizeof(WCHAR));
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137 | if (!GetUserObjectInformationW(h, UOI_NAME, name, len, &len))
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138 | return -1;
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139 |
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140 | len++, len &= ~1; /* paranoia */
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141 | name[len / sizeof(WCHAR)] = L'\0'; /* paranoia */
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142 | # if 1
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143 | /*
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144 | * This doesn't cover "interactive" services [working with real
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145 | * WinSta0's] nor programs started non-interactively by Task Scheduler
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146 | * [those are working with SAWinSta].
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147 | */
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148 | if (wcsstr(name, L"Service-0x"))
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149 | return 1;
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150 | # else
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151 | /* This covers all non-interactive programs such as services. */
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152 | if (!wcsstr(name, L"WinSta0"))
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153 | return 1;
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154 | # endif
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155 | else
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156 | return 0;
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157 | }
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158 | # else
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159 | int OPENSSL_isservice(void)
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160 | {
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161 | return 0;
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162 | }
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163 | # endif
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164 |
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165 | void OPENSSL_showfatal(const char *fmta, ...)
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166 | {
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167 | va_list ap;
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168 | TCHAR buf[256];
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169 | const TCHAR *fmt;
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170 | # ifdef STD_ERROR_HANDLE /* what a dirty trick! */
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171 | HANDLE h;
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172 |
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173 | if ((h = GetStdHandle(STD_ERROR_HANDLE)) != NULL &&
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174 | GetFileType(h) != FILE_TYPE_UNKNOWN) {
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175 | /* must be console application */
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176 | int len;
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177 | DWORD out;
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178 |
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179 | va_start(ap, fmta);
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180 | len = _vsnprintf((char *)buf, sizeof(buf), fmta, ap);
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181 | WriteFile(h, buf, len < 0 ? sizeof(buf) : (DWORD) len, &out, NULL);
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182 | va_end(ap);
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183 | return;
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184 | }
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185 | # endif
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186 |
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187 | if (sizeof(TCHAR) == sizeof(char))
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188 | fmt = (const TCHAR *)fmta;
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189 | else
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190 | do {
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191 | int keepgoing;
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192 | size_t len_0 = strlen(fmta) + 1, i;
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193 | WCHAR *fmtw;
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194 |
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195 | fmtw = (WCHAR *)alloca(len_0 * sizeof(WCHAR));
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196 | if (fmtw == NULL) {
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197 | fmt = (const TCHAR *)L"no stack?";
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198 | break;
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199 | }
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200 | if (!MultiByteToWideChar(CP_ACP, 0, fmta, len_0, fmtw, len_0))
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201 | for (i = 0; i < len_0; i++)
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202 | fmtw[i] = (WCHAR)fmta[i];
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203 | for (i = 0; i < len_0; i++) {
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204 | if (fmtw[i] == L'%')
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205 | do {
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206 | keepgoing = 0;
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207 | switch (fmtw[i + 1]) {
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208 | case L'0':
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209 | case L'1':
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210 | case L'2':
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211 | case L'3':
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212 | case L'4':
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213 | case L'5':
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214 | case L'6':
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215 | case L'7':
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216 | case L'8':
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217 | case L'9':
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218 | case L'.':
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219 | case L'*':
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220 | case L'-':
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221 | i++;
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222 | keepgoing = 1;
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223 | break;
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224 | case L's':
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225 | fmtw[i + 1] = L'S';
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226 | break;
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227 | case L'S':
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228 | fmtw[i + 1] = L's';
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229 | break;
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230 | case L'c':
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231 | fmtw[i + 1] = L'C';
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232 | break;
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233 | case L'C':
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234 | fmtw[i + 1] = L'c';
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235 | break;
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236 | }
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237 | } while (keepgoing);
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238 | }
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239 | fmt = (const TCHAR *)fmtw;
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240 | } while (0);
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241 |
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242 | va_start(ap, fmta);
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243 | _vsntprintf(buf, OSSL_NELEM(buf) - 1, fmt, ap);
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244 | buf[OSSL_NELEM(buf) - 1] = _T('\0');
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245 | va_end(ap);
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246 |
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247 | # if defined(_WIN32_WINNT) && _WIN32_WINNT>=0x0333
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248 | /* this -------------v--- guards NT-specific calls */
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249 | if (check_winnt() && OPENSSL_isservice() > 0) {
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250 | HANDLE hEventLog = RegisterEventSource(NULL, _T("OpenSSL"));
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251 |
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252 | if (hEventLog != NULL) {
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253 | const TCHAR *pmsg = buf;
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254 |
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255 | if (!ReportEvent(hEventLog, EVENTLOG_ERROR_TYPE, 0, 0, NULL,
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256 | 1, 0, &pmsg, NULL)) {
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257 | #if defined(DEBUG)
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258 | /*
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259 | * We are in a situation where we tried to report a critical
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260 | * error and this failed for some reason. As a last resort,
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261 | * in debug builds, send output to the debugger or any other
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262 | * tool like DebugView which can monitor the output.
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263 | */
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264 | OutputDebugString(pmsg);
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265 | #endif
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266 | }
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267 |
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268 | (void)DeregisterEventSource(hEventLog);
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269 | }
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270 | } else
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271 | # endif
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272 | MessageBox(NULL, buf, _T("OpenSSL: FATAL"), MB_OK | MB_ICONERROR);
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273 | }
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274 | #else
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275 | void OPENSSL_showfatal(const char *fmta, ...)
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276 | {
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277 | #ifndef OPENSSL_NO_STDIO
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278 | va_list ap;
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279 |
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280 | va_start(ap, fmta);
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281 | vfprintf(stderr, fmta, ap);
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282 | va_end(ap);
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283 | #endif
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284 | }
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285 |
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286 | int OPENSSL_isservice(void)
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287 | {
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288 | return 0;
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289 | }
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290 | #endif
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291 |
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292 | void OPENSSL_die(const char *message, const char *file, int line)
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293 | {
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294 | OPENSSL_showfatal("%s:%d: OpenSSL internal error: %s\n",
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295 | file, line, message);
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296 | #if !defined(_WIN32) || defined(__CYGWIN__)
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297 | abort();
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298 | #else
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299 | /*
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300 | * Win32 abort() customarily shows a dialog, but we just did that...
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301 | */
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302 | # if !defined(_WIN32_WCE)
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303 | raise(SIGABRT);
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304 | # endif
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305 | _exit(3);
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306 | #endif
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307 | }
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308 |
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309 | #if !defined(OPENSSL_CPUID_OBJ)
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310 | /* volatile unsigned char* pointers are there because
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311 | * 1. Accessing a variable declared volatile via a pointer
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312 | * that lacks a volatile qualifier causes undefined behavior.
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313 | * 2. When the variable itself is not volatile the compiler is
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314 | * not required to keep all those reads and can convert
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315 | * this into canonical memcmp() which doesn't read the whole block.
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316 | * Pointers to volatile resolve the first problem fully. The second
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317 | * problem cannot be resolved in any Standard-compliant way but this
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318 | * works the problem around. Compilers typically react to
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319 | * pointers to volatile by preserving the reads and writes through them.
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320 | * The latter is not required by the Standard if the memory pointed to
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321 | * is not volatile.
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322 | * Pointers themselves are volatile in the function signature to work
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323 | * around a subtle bug in gcc 4.6+ which causes writes through
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324 | * pointers to volatile to not be emitted in some rare,
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325 | * never needed in real life, pieces of code.
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326 | */
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327 | int CRYPTO_memcmp(const volatile void * volatile in_a,
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328 | const volatile void * volatile in_b,
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329 | size_t len)
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330 | {
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331 | size_t i;
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332 | const volatile unsigned char *a = in_a;
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333 | const volatile unsigned char *b = in_b;
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334 | unsigned char x = 0;
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335 |
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336 | for (i = 0; i < len; i++)
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337 | x |= a[i] ^ b[i];
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338 |
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339 | return x;
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340 | }
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341 | #endif
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