1 /*
2 * Copyright 2011-2023 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 /* We need to use some engine deprecated APIs */
11 #define OPENSSL_SUPPRESS_DEPRECATED
12
13 #include <openssl/opensslconf.h>
14
15 #include <stdio.h>
16 #include <string.h>
17 #include "crypto/engine.h"
18 #include "internal/cryptlib.h"
19 #include <openssl/rand.h>
20 #include <openssl/err.h>
21 #include <openssl/crypto.h>
22
23 #if defined(__has_feature)
24 # if __has_feature(memory_sanitizer)
25 # include <sanitizer/msan_interface.h>
26 # endif
27 #endif
28
29 #if (defined(__i386) || defined(__i386__) || defined(_M_IX86) || \
30 defined(__x86_64) || defined(__x86_64__) || \
31 defined(_M_AMD64) || defined (_M_X64)) && defined(OPENSSL_CPUID_OBJ)
32
33 size_t OPENSSL_ia32_rdrand_bytes(unsigned char *buf, size_t len);
34
get_random_bytes(unsigned char * buf,int num)35 static int get_random_bytes(unsigned char *buf, int num)
36 {
37 if (num < 0) {
38 return 0;
39 }
40
41 # if defined(__has_feature)
42 # if __has_feature(memory_sanitizer)
43 /*
44 * MemorySanitizer fails to understand asm and produces false positive
45 * use-of-uninitialized-value warnings.
46 */
47 __msan_unpoison(buf, num);
48 # endif
49 # endif
50
51 return (size_t)num == OPENSSL_ia32_rdrand_bytes(buf, (size_t)num);
52 }
53
random_status(void)54 static int random_status(void)
55 {
56 return 1;
57 }
58
59 static RAND_METHOD rdrand_meth = {
60 NULL, /* seed */
61 get_random_bytes,
62 NULL, /* cleanup */
63 NULL, /* add */
64 get_random_bytes,
65 random_status,
66 };
67
rdrand_init(ENGINE * e)68 static int rdrand_init(ENGINE *e)
69 {
70 return 1;
71 }
72
73 static const char *engine_e_rdrand_id = "rdrand";
74 static const char *engine_e_rdrand_name = "Intel RDRAND engine";
75
bind_helper(ENGINE * e)76 static int bind_helper(ENGINE *e)
77 {
78 if (!ENGINE_set_id(e, engine_e_rdrand_id) ||
79 !ENGINE_set_name(e, engine_e_rdrand_name) ||
80 !ENGINE_set_flags(e, ENGINE_FLAGS_NO_REGISTER_ALL) ||
81 !ENGINE_set_init_function(e, rdrand_init) ||
82 !ENGINE_set_RAND(e, &rdrand_meth))
83 return 0;
84
85 return 1;
86 }
87
ENGINE_rdrand(void)88 static ENGINE *ENGINE_rdrand(void)
89 {
90 ENGINE *ret = ENGINE_new();
91 if (ret == NULL)
92 return NULL;
93 if (!bind_helper(ret)) {
94 ENGINE_free(ret);
95 return NULL;
96 }
97 return ret;
98 }
99
engine_load_rdrand_int(void)100 void engine_load_rdrand_int(void)
101 {
102 if (OPENSSL_ia32cap_P[1] & (1 << (62 - 32))) {
103 ENGINE *toadd = ENGINE_rdrand();
104 if (!toadd)
105 return;
106 ERR_set_mark();
107 ENGINE_add(toadd);
108 /*
109 * If the "add" worked, it gets a structural reference. So either way, we
110 * release our just-created reference.
111 */
112 ENGINE_free(toadd);
113 /*
114 * If the "add" didn't work, it was probably a conflict because it was
115 * already added (eg. someone calling ENGINE_load_blah then calling
116 * ENGINE_load_builtin_engines() perhaps).
117 */
118 ERR_pop_to_mark();
119 }
120 }
121 #else
engine_load_rdrand_int(void)122 void engine_load_rdrand_int(void)
123 {
124 }
125 #endif
126
