1 | /* |
2 | * Copyright 2011-2018 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 <openssl/opensslconf.h> |
11 | |
12 | #include <stdio.h> |
13 | #include <string.h> |
14 | #include "crypto/engine.h" |
15 | #include "internal/cryptlib.h" |
16 | #include <openssl/rand.h> |
17 | #include <openssl/err.h> |
18 | #include <openssl/crypto.h> |
19 | |
20 | #if (defined(__i386) || defined(__i386__) || defined(_M_IX86) || \ |
21 | defined(__x86_64) || defined(__x86_64__) || \ |
22 | defined(_M_AMD64) || defined (_M_X64)) && defined(OPENSSL_CPUID_OBJ) |
23 | |
24 | size_t OPENSSL_ia32_rdrand_bytes(unsigned char *buf, size_t len); |
25 | |
26 | static int get_random_bytes(unsigned char *buf, int num) |
27 | { |
28 | if (num < 0) { |
29 | return 0; |
30 | } |
31 | |
32 | return (size_t)num == OPENSSL_ia32_rdrand_bytes(buf, (size_t)num); |
33 | } |
34 | |
35 | static int random_status(void) |
36 | { |
37 | return 1; |
38 | } |
39 | |
40 | static RAND_METHOD rdrand_meth = { |
41 | NULL, /* seed */ |
42 | get_random_bytes, |
43 | NULL, /* cleanup */ |
44 | NULL, /* add */ |
45 | get_random_bytes, |
46 | random_status, |
47 | }; |
48 | |
49 | static int rdrand_init(ENGINE *e) |
50 | { |
51 | return 1; |
52 | } |
53 | |
54 | static const char *engine_e_rdrand_id = "rdrand" ; |
55 | static const char *engine_e_rdrand_name = "Intel RDRAND engine" ; |
56 | |
57 | static int bind_helper(ENGINE *e) |
58 | { |
59 | if (!ENGINE_set_id(e, engine_e_rdrand_id) || |
60 | !ENGINE_set_name(e, engine_e_rdrand_name) || |
61 | !ENGINE_set_flags(e, ENGINE_FLAGS_NO_REGISTER_ALL) || |
62 | !ENGINE_set_init_function(e, rdrand_init) || |
63 | !ENGINE_set_RAND(e, &rdrand_meth)) |
64 | return 0; |
65 | |
66 | return 1; |
67 | } |
68 | |
69 | static ENGINE *ENGINE_rdrand(void) |
70 | { |
71 | ENGINE *ret = ENGINE_new(); |
72 | if (ret == NULL) |
73 | return NULL; |
74 | if (!bind_helper(ret)) { |
75 | ENGINE_free(ret); |
76 | return NULL; |
77 | } |
78 | return ret; |
79 | } |
80 | |
81 | void engine_load_rdrand_int(void) |
82 | { |
83 | if (OPENSSL_ia32cap_P[1] & (1 << (62 - 32))) { |
84 | ENGINE *toadd = ENGINE_rdrand(); |
85 | if (!toadd) |
86 | return; |
87 | ENGINE_add(toadd); |
88 | ENGINE_free(toadd); |
89 | ERR_clear_error(); |
90 | } |
91 | } |
92 | #else |
93 | void engine_load_rdrand_int(void) |
94 | { |
95 | } |
96 | #endif |
97 | |