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37f010e2 AP |
1 | /* ==================================================================== |
2 | * Copyright (c) 2011 The OpenSSL Project. All rights reserved. | |
3 | * | |
4 | * Redistribution and use in source and binary forms, with or without | |
5 | * modification, are permitted provided that the following conditions | |
6 | * are met: | |
7 | * | |
8 | * 1. Redistributions of source code must retain the above copyright | |
9 | * notice, this list of conditions and the following disclaimer. | |
10 | * | |
11 | * 2. Redistributions in binary form must reproduce the above copyright | |
12 | * notice, this list of conditions and the following disclaimer in | |
13 | * the documentation and/or other materials provided with the | |
14 | * distribution. | |
15 | * | |
16 | * 3. All advertising materials mentioning features or use of this | |
17 | * software must display the following acknowledgment: | |
18 | * "This product includes software developed by the OpenSSL Project | |
19 | * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" | |
20 | * | |
21 | * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to | |
22 | * endorse or promote products derived from this software without | |
23 | * prior written permission. For written permission, please contact | |
24 | * licensing@OpenSSL.org. | |
25 | * | |
26 | * 5. Products derived from this software may not be called "OpenSSL" | |
27 | * nor may "OpenSSL" appear in their names without prior written | |
28 | * permission of the OpenSSL Project. | |
29 | * | |
30 | * 6. Redistributions of any form whatsoever must retain the following | |
31 | * acknowledgment: | |
32 | * "This product includes software developed by the OpenSSL Project | |
33 | * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" | |
34 | * | |
35 | * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY | |
36 | * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
37 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
38 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR | |
39 | * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
40 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
41 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | |
42 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
43 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
44 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
45 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED | |
46 | * OF THE POSSIBILITY OF SUCH DAMAGE. | |
47 | * ==================================================================== | |
48 | */ | |
49 | ||
50 | #include <openssl/opensslconf.h> | |
51 | ||
52 | #include <stdio.h> | |
53 | #include <string.h> | |
7b9f8f7f | 54 | #include <internal/engine.h> |
19ad3457 DSH |
55 | #include <openssl/rand.h> |
56 | #include <openssl/err.h> | |
7b9f8f7f | 57 | #include <openssl/crypto.h> |
37f010e2 AP |
58 | |
59 | #if (defined(__i386) || defined(__i386__) || defined(_M_IX86) || \ | |
60 | defined(__x86_64) || defined(__x86_64__) || \ | |
f744bcfd | 61 | defined(_M_AMD64) || defined (_M_X64)) && defined(OPENSSL_CPUID_OBJ) |
37f010e2 AP |
62 | |
63 | size_t OPENSSL_ia32_rdrand(void); | |
64 | ||
0f113f3e MC |
65 | static int get_random_bytes(unsigned char *buf, int num) |
66 | { | |
67 | size_t rnd; | |
68 | ||
69 | while (num >= (int)sizeof(size_t)) { | |
70 | if ((rnd = OPENSSL_ia32_rdrand()) == 0) | |
71 | return 0; | |
72 | ||
73 | *((size_t *)buf) = rnd; | |
74 | buf += sizeof(size_t); | |
75 | num -= sizeof(size_t); | |
76 | } | |
77 | if (num) { | |
78 | if ((rnd = OPENSSL_ia32_rdrand()) == 0) | |
79 | return 0; | |
80 | ||
81 | memcpy(buf, &rnd, num); | |
82 | } | |
83 | ||
84 | return 1; | |
85 | } | |
86 | ||
87 | static int random_status(void) | |
88 | { | |
89 | return 1; | |
90 | } | |
91 | ||
92 | static RAND_METHOD rdrand_meth = { | |
93 | NULL, /* seed */ | |
94 | get_random_bytes, | |
95 | NULL, /* cleanup */ | |
96 | NULL, /* add */ | |
97 | get_random_bytes, | |
98 | random_status, | |
99 | }; | |
37f010e2 AP |
100 | |
101 | static int rdrand_init(ENGINE *e) | |
0f113f3e MC |
102 | { |
103 | return 1; | |
104 | } | |
37f010e2 AP |
105 | |
106 | static const char *engine_e_rdrand_id = "rdrand"; | |
107 | static const char *engine_e_rdrand_name = "Intel RDRAND engine"; | |
108 | ||
109 | static int bind_helper(ENGINE *e) | |
0f113f3e MC |
110 | { |
111 | if (!ENGINE_set_id(e, engine_e_rdrand_id) || | |
112 | !ENGINE_set_name(e, engine_e_rdrand_name) || | |
113 | !ENGINE_set_flags(e, ENGINE_FLAGS_NO_REGISTER_ALL) || | |
114 | !ENGINE_set_init_function(e, rdrand_init) || | |
115 | !ENGINE_set_RAND(e, &rdrand_meth)) | |
116 | return 0; | |
37f010e2 | 117 | |
0f113f3e MC |
118 | return 1; |
119 | } | |
37f010e2 AP |
120 | |
121 | static ENGINE *ENGINE_rdrand(void) | |
0f113f3e MC |
122 | { |
123 | ENGINE *ret = ENGINE_new(); | |
90945fa3 | 124 | if (ret == NULL) |
0f113f3e MC |
125 | return NULL; |
126 | if (!bind_helper(ret)) { | |
127 | ENGINE_free(ret); | |
128 | return NULL; | |
129 | } | |
130 | return ret; | |
131 | } | |
132 | ||
342c21cd | 133 | void int_engine_load_rdrand(void) |
0f113f3e MC |
134 | { |
135 | extern unsigned int OPENSSL_ia32cap_P[]; | |
136 | ||
137 | if (OPENSSL_ia32cap_P[1] & (1 << (62 - 32))) { | |
138 | ENGINE *toadd = ENGINE_rdrand(); | |
139 | if (!toadd) | |
140 | return; | |
141 | ENGINE_add(toadd); | |
142 | ENGINE_free(toadd); | |
143 | ERR_clear_error(); | |
144 | } | |
145 | } | |
37f010e2 | 146 | #else |
342c21cd | 147 | void int_engine_load_rdrand(void) |
0f113f3e MC |
148 | { |
149 | } | |
37f010e2 | 150 | #endif |