1/*
2 * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10#include "internal/cryptlib.h"
11#include <openssl/rand.h>
12#include "rand_local.h"
13#include "crypto/rand.h"
14#if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32)
15
16# ifndef OPENSSL_RAND_SEED_OS
17# error "Unsupported seeding method configured; must be os"
18# endif
19
20# include <windows.h>
21/* On Windows Vista or higher use BCrypt instead of the legacy CryptoAPI */
22# if defined(_MSC_VER) && _MSC_VER > 1500 /* 1500 = Visual Studio 2008 */ \
23 && defined(_WIN32_WINNT) && _WIN32_WINNT >= 0x0600
24# define USE_BCRYPTGENRANDOM
25# endif
26
27# ifdef USE_BCRYPTGENRANDOM
28# include <bcrypt.h>
29# pragma comment(lib, "bcrypt.lib")
30# ifndef STATUS_SUCCESS
31# define STATUS_SUCCESS ((NTSTATUS)0x00000000L)
32# endif
33# else
34# include <wincrypt.h>
35/*
36 * Intel hardware RNG CSP -- available from
37 * http://developer.intel.com/design/security/rng/redist_license.htm
38 */
39# define PROV_INTEL_SEC 22
40# define INTEL_DEF_PROV L"Intel Hardware Cryptographic Service Provider"
41# endif
42
43size_t rand_pool_acquire_entropy(RAND_POOL *pool)
44{
45# ifndef USE_BCRYPTGENRANDOM
46 HCRYPTPROV hProvider;
47# endif
48 unsigned char *buffer;
49 size_t bytes_needed;
50 size_t entropy_available = 0;
51
52
53# ifdef OPENSSL_RAND_SEED_RDTSC
54 entropy_available = rand_acquire_entropy_from_tsc(pool);
55 if (entropy_available > 0)
56 return entropy_available;
57# endif
58
59# ifdef OPENSSL_RAND_SEED_RDCPU
60 entropy_available = rand_acquire_entropy_from_cpu(pool);
61 if (entropy_available > 0)
62 return entropy_available;
63# endif
64
65# ifdef USE_BCRYPTGENRANDOM
66 bytes_needed = rand_pool_bytes_needed(pool, 1 /*entropy_factor*/);
67 buffer = rand_pool_add_begin(pool, bytes_needed);
68 if (buffer != NULL) {
69 size_t bytes = 0;
70 if (BCryptGenRandom(NULL, buffer, bytes_needed,
71 BCRYPT_USE_SYSTEM_PREFERRED_RNG) == STATUS_SUCCESS)
72 bytes = bytes_needed;
73
74 rand_pool_add_end(pool, bytes, 8 * bytes);
75 entropy_available = rand_pool_entropy_available(pool);
76 }
77 if (entropy_available > 0)
78 return entropy_available;
79# else
80 bytes_needed = rand_pool_bytes_needed(pool, 1 /*entropy_factor*/);
81 buffer = rand_pool_add_begin(pool, bytes_needed);
82 if (buffer != NULL) {
83 size_t bytes = 0;
84 /* poll the CryptoAPI PRNG */
85 if (CryptAcquireContextW(&hProvider, NULL, NULL, PROV_RSA_FULL,
86 CRYPT_VERIFYCONTEXT | CRYPT_SILENT) != 0) {
87 if (CryptGenRandom(hProvider, bytes_needed, buffer) != 0)
88 bytes = bytes_needed;
89
90 CryptReleaseContext(hProvider, 0);
91 }
92
93 rand_pool_add_end(pool, bytes, 8 * bytes);
94 entropy_available = rand_pool_entropy_available(pool);
95 }
96 if (entropy_available > 0)
97 return entropy_available;
98
99 bytes_needed = rand_pool_bytes_needed(pool, 1 /*entropy_factor*/);
100 buffer = rand_pool_add_begin(pool, bytes_needed);
101 if (buffer != NULL) {
102 size_t bytes = 0;
103 /* poll the Pentium PRG with CryptoAPI */
104 if (CryptAcquireContextW(&hProvider, NULL,
105 INTEL_DEF_PROV, PROV_INTEL_SEC,
106 CRYPT_VERIFYCONTEXT | CRYPT_SILENT) != 0) {
107 if (CryptGenRandom(hProvider, bytes_needed, buffer) != 0)
108 bytes = bytes_needed;
109
110 CryptReleaseContext(hProvider, 0);
111 }
112 rand_pool_add_end(pool, bytes, 8 * bytes);
113 entropy_available = rand_pool_entropy_available(pool);
114 }
115 if (entropy_available > 0)
116 return entropy_available;
117# endif
118
119 return rand_pool_entropy_available(pool);
120}
121
122
123int rand_pool_add_nonce_data(RAND_POOL *pool)
124{
125 struct {
126 DWORD pid;
127 DWORD tid;
128 FILETIME time;
129 } data;
130
131 /* Erase the entire structure including any padding */
132 memset(&data, 0, sizeof(data));
133
134 /*
135 * Add process id, thread id, and a high resolution timestamp to
136 * ensure that the nonce is unique with high probability for
137 * different process instances.
138 */
139 data.pid = GetCurrentProcessId();
140 data.tid = GetCurrentThreadId();
141 GetSystemTimeAsFileTime(&data.time);
142
143 return rand_pool_add(pool, (unsigned char *)&data, sizeof(data), 0);
144}
145
146int rand_pool_add_additional_data(RAND_POOL *pool)
147{
148 struct {
149 DWORD tid;
150 LARGE_INTEGER time;
151 } data;
152
153 /* Erase the entire structure including any padding */
154 memset(&data, 0, sizeof(data));
155
156 /*
157 * Add some noise from the thread id and a high resolution timer.
158 * The thread id adds a little randomness if the drbg is accessed
159 * concurrently (which is the case for the <master> drbg).
160 */
161 data.tid = GetCurrentThreadId();
162 QueryPerformanceCounter(&data.time);
163 return rand_pool_add(pool, (unsigned char *)&data, sizeof(data), 0);
164}
165
166# if !defined(OPENSSL_NO_DEPRECATED_1_1_0) && !defined(FIPS_MODE)
167int RAND_event(UINT iMsg, WPARAM wParam, LPARAM lParam)
168{
169 RAND_poll();
170 return RAND_status();
171}
172
173void RAND_screen(void)
174{
175 RAND_poll();
176}
177# endif
178
179int rand_pool_init(void)
180{
181 return 1;
182}
183
184void rand_pool_cleanup(void)
185{
186}
187
188void rand_pool_keep_random_devices_open(int keep)
189{
190}
191
192#endif
193