1 /*
2 * Copyright 2011-2020 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(__i386) || defined(__i386__) || defined(_M_IX86) || \
24 defined(__x86_64) || defined(__x86_64__) || \
25 defined(_M_AMD64) || defined (_M_X64)) && defined(OPENSSL_CPUID_OBJ)
26
27 size_t OPENSSL_ia32_rdrand_bytes(unsigned char *buf, size_t len);
28
get_random_bytes(unsigned char * buf,int num)29 static int get_random_bytes(unsigned char *buf, int num)
30 {
31 if (num < 0) {
32 return 0;
33 }
34
35 return (size_t)num == OPENSSL_ia32_rdrand_bytes(buf, (size_t)num);
36 }
37
random_status(void)38 static int random_status(void)
39 {
40 return 1;
41 }
42
43 static RAND_METHOD rdrand_meth = {
44 NULL, /* seed */
45 get_random_bytes,
46 NULL, /* cleanup */
47 NULL, /* add */
48 get_random_bytes,
49 random_status,
50 };
51
rdrand_init(ENGINE * e)52 static int rdrand_init(ENGINE *e)
53 {
54 return 1;
55 }
56
57 static const char *engine_e_rdrand_id = "rdrand";
58 static const char *engine_e_rdrand_name = "Intel RDRAND engine";
59
bind_helper(ENGINE * e)60 static int bind_helper(ENGINE *e)
61 {
62 if (!ENGINE_set_id(e, engine_e_rdrand_id) ||
63 !ENGINE_set_name(e, engine_e_rdrand_name) ||
64 !ENGINE_set_flags(e, ENGINE_FLAGS_NO_REGISTER_ALL) ||
65 !ENGINE_set_init_function(e, rdrand_init) ||
66 !ENGINE_set_RAND(e, &rdrand_meth))
67 return 0;
68
69 return 1;
70 }
71
ENGINE_rdrand(void)72 static ENGINE *ENGINE_rdrand(void)
73 {
74 ENGINE *ret = ENGINE_new();
75 if (ret == NULL)
76 return NULL;
77 if (!bind_helper(ret)) {
78 ENGINE_free(ret);
79 return NULL;
80 }
81 return ret;
82 }
83
engine_load_rdrand_int(void)84 void engine_load_rdrand_int(void)
85 {
86 if (OPENSSL_ia32cap_P[1] & (1 << (62 - 32))) {
87 ENGINE *toadd = ENGINE_rdrand();
88 if (!toadd)
89 return;
90 ERR_set_mark();
91 ENGINE_add(toadd);
92 /*
93 * If the "add" worked, it gets a structural reference. So either way, we
94 * release our just-created reference.
95 */
96 ENGINE_free(toadd);
97 /*
98 * If the "add" didn't work, it was probably a conflict because it was
99 * already added (eg. someone calling ENGINE_load_blah then calling
100 * ENGINE_load_builtin_engines() perhaps).
101 */
102 ERR_pop_to_mark();
103 }
104 }
105 #else
engine_load_rdrand_int(void)106 void engine_load_rdrand_int(void)
107 {
108 }
109 #endif
110
