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>
54 #include <openssl/engine.h>
55 #include <openssl/rand.h>
56 #include <openssl/err.h>
57
58 #if (defined(__i386) || defined(__i386__) || defined(_M_IX86) || \
59 defined(__x86_64) || defined(__x86_64__) || \
60 defined(_M_AMD64) || defined (_M_X64)) && defined(OPENSSL_CPUID_OBJ)
61
62 size_t OPENSSL_ia32_rdrand(void);
63
get_random_bytes(unsigned char * buf,int num)64 static int get_random_bytes(unsigned char *buf, int num)
65 {
66 size_t rnd;
67
68 while (num >= (int)sizeof(size_t)) {
69 if ((rnd = OPENSSL_ia32_rdrand()) == 0)
70 return 0;
71
72 *((size_t *)buf) = rnd;
73 buf += sizeof(size_t);
74 num -= sizeof(size_t);
75 }
76 if (num) {
77 if ((rnd = OPENSSL_ia32_rdrand()) == 0)
78 return 0;
79
80 memcpy(buf, &rnd, num);
81 }
82
83 return 1;
84 }
85
random_status(void)86 static int random_status(void)
87 {
88 return 1;
89 }
90
91 static RAND_METHOD rdrand_meth = {
92 NULL, /* seed */
93 get_random_bytes,
94 NULL, /* cleanup */
95 NULL, /* add */
96 get_random_bytes,
97 random_status,
98 };
99
rdrand_init(ENGINE * e)100 static int rdrand_init(ENGINE *e)
101 {
102 return 1;
103 }
104
105 static const char *engine_e_rdrand_id = "rdrand";
106 static const char *engine_e_rdrand_name = "Intel RDRAND engine";
107
bind_helper(ENGINE * e)108 static int bind_helper(ENGINE *e)
109 {
110 if (!ENGINE_set_id(e, engine_e_rdrand_id) ||
111 !ENGINE_set_name(e, engine_e_rdrand_name) ||
112 !ENGINE_set_flags(e, ENGINE_FLAGS_NO_REGISTER_ALL) ||
113 !ENGINE_set_init_function(e, rdrand_init) ||
114 !ENGINE_set_RAND(e, &rdrand_meth))
115 return 0;
116
117 return 1;
118 }
119
ENGINE_rdrand(void)120 static ENGINE *ENGINE_rdrand(void)
121 {
122 ENGINE *ret = ENGINE_new();
123 if (!ret)
124 return NULL;
125 if (!bind_helper(ret)) {
126 ENGINE_free(ret);
127 return NULL;
128 }
129 return ret;
130 }
131
ENGINE_load_rdrand(void)132 void ENGINE_load_rdrand(void)
133 {
134 extern unsigned int OPENSSL_ia32cap_P[];
135
136 if (OPENSSL_ia32cap_P[1] & (1 << (62 - 32))) {
137 ENGINE *toadd = ENGINE_rdrand();
138 if (!toadd)
139 return;
140 ENGINE_add(toadd);
141 ENGINE_free(toadd);
142 ERR_clear_error();
143 }
144 }
145 #else
ENGINE_load_rdrand(void)146 void ENGINE_load_rdrand(void)
147 {
148 }
149 #endif
150