1 | /*
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2 | * Copyright 1995-2016 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 | #include "internal/cryptlib.h"
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11 | #include <openssl/rand.h>
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12 | #include "rand_lcl.h"
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13 |
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14 | #if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32)
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15 | # include <windows.h>
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16 | /* On Windows 7 or higher use BCrypt instead of the legacy CryptoAPI */
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17 | # if defined(_MSC_VER) && defined(_WIN32_WINNT) && _WIN32_WINNT>=0x0601
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18 | # define RAND_WINDOWS_USE_BCRYPT
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19 | # endif
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20 |
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21 | # ifdef RAND_WINDOWS_USE_BCRYPT
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22 | # include <bcrypt.h>
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23 | # pragma comment(lib, "bcrypt.lib")
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24 | # ifndef STATUS_SUCCESS
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25 | # define STATUS_SUCCESS ((NTSTATUS)0x00000000L)
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26 | # endif
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27 | # else
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28 | # include <wincrypt.h>
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29 | /*
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30 | * Intel hardware RNG CSP -- available from
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31 | * http://developer.intel.com/design/security/rng/redist_license.htm
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32 | */
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33 | # define PROV_INTEL_SEC 22
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34 | # define INTEL_DEF_PROV L"Intel Hardware Cryptographic Service Provider"
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35 | # endif
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36 |
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37 | static void readtimer(void);
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38 |
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39 | int RAND_poll(void)
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40 | {
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41 | MEMORYSTATUS mst;
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42 | # ifndef RAND_WINDOWS_USE_BCRYPT
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43 | HCRYPTPROV hProvider;
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44 | # endif
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45 | DWORD w;
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46 | BYTE buf[64];
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47 |
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48 | # ifdef RAND_WINDOWS_USE_BCRYPT
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49 | if (BCryptGenRandom(NULL, buf, (ULONG)sizeof(buf), BCRYPT_USE_SYSTEM_PREFERRED_RNG) == STATUS_SUCCESS) {
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50 | RAND_add(buf, sizeof(buf), sizeof(buf));
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51 | }
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52 | # else
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53 | /* poll the CryptoAPI PRNG */
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54 | /* The CryptoAPI returns sizeof(buf) bytes of randomness */
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55 | if (CryptAcquireContextW(&hProvider, NULL, NULL, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT | CRYPT_SILENT)) {
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56 | if (CryptGenRandom(hProvider, (DWORD)sizeof(buf), buf) != 0) {
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57 | RAND_add(buf, sizeof(buf), sizeof(buf));
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58 | }
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59 | CryptReleaseContext(hProvider, 0);
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60 | }
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61 |
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62 | /* poll the Pentium PRG with CryptoAPI */
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63 | if (CryptAcquireContextW(&hProvider, NULL, INTEL_DEF_PROV, PROV_INTEL_SEC, CRYPT_VERIFYCONTEXT | CRYPT_SILENT)) {
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64 | if (CryptGenRandom(hProvider, (DWORD)sizeof(buf), buf) != 0) {
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65 | RAND_add(buf, sizeof(buf), sizeof(buf));
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66 | }
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67 | CryptReleaseContext(hProvider, 0);
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68 | }
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69 | # endif
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70 |
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71 | /* timer data */
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72 | readtimer();
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73 |
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74 | /* memory usage statistics */
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75 | GlobalMemoryStatus(&mst);
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76 | RAND_add(&mst, sizeof(mst), 1);
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77 |
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78 | /* process ID */
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79 | w = GetCurrentProcessId();
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80 | RAND_add(&w, sizeof(w), 1);
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81 |
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82 | return (1);
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83 | }
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84 |
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85 | #if OPENSSL_API_COMPAT < 0x10100000L
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86 | int RAND_event(UINT iMsg, WPARAM wParam, LPARAM lParam)
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87 | {
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88 | RAND_poll();
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89 | return RAND_status();
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90 | }
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91 |
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92 | void RAND_screen(void)
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93 | {
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94 | RAND_poll();
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95 | }
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96 | #endif
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97 |
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98 | /* feed timing information to the PRNG */
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99 | static void readtimer(void)
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100 | {
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101 | DWORD w;
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102 | LARGE_INTEGER l;
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103 | static int have_perfc = 1;
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104 | # if defined(_MSC_VER) && defined(_M_X86)
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105 | static int have_tsc = 1;
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106 | DWORD cyclecount;
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107 |
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108 | if (have_tsc) {
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109 | __try {
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110 | __asm {
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111 | _emit 0x0f _emit 0x31 mov cyclecount, eax}
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112 | RAND_add(&cyclecount, sizeof(cyclecount), 1);
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113 | }
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114 | __except(EXCEPTION_EXECUTE_HANDLER) {
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115 | have_tsc = 0;
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116 | }
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117 | }
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118 | # else
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119 | # define have_tsc 0
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120 | # endif
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121 |
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122 | if (have_perfc) {
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123 | if (QueryPerformanceCounter(&l) == 0)
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124 | have_perfc = 0;
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125 | else
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126 | RAND_add(&l, sizeof(l), 0);
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127 | }
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128 |
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129 | if (!have_tsc && !have_perfc) {
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130 | w = GetTickCount();
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131 | RAND_add(&w, sizeof(w), 0);
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132 | }
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133 | }
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134 |
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135 | #endif
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