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
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) return 0;
70
71 *((size_t *)buf) = rnd;
72 buf += sizeof(size_t);
73 num -= sizeof(size_t);
74 }
75 if (num) {
76 if ((rnd = OPENSSL_ia32_rdrand()) == 0) return 0;
77
78 memcpy (buf,&rnd,num);
79 }
80
81 return 1;
82 }
83
84 static int random_status (void)
85 { return 1; }
86
87 static RAND_METHOD rdrand_meth =
88 {
89 NULL, /* seed */
90 get_random_bytes,
91 NULL, /* cleanup */
92 NULL, /* add */
93 get_random_bytes,
94 random_status,
95 };
96
97 static int rdrand_init(ENGINE *e)
98 { return 1; }
99
100 static const char *engine_e_rdrand_id = "rdrand";
101 static const char *engine_e_rdrand_name = "Intel RDRAND engine";
102
103 static int bind_helper(ENGINE *e)
104 {
105 if (!ENGINE_set_id(e, engine_e_rdrand_id) ||
106 !ENGINE_set_name(e, engine_e_rdrand_name) ||
107 !ENGINE_set_flags(e, ENGINE_FLAGS_NO_REGISTER_ALL) ||
108 !ENGINE_set_init_function(e, rdrand_init) ||
109 !ENGINE_set_RAND(e, &rdrand_meth) )
110 return 0;
111
112 return 1;
113 }
114
115 static ENGINE *ENGINE_rdrand(void)
116 {
117 ENGINE *ret = ENGINE_new();
118 if(!ret)
119 return NULL;
120 if(!bind_helper(ret))
121 {
122 ENGINE_free(ret);
123 return NULL;
124 }
125 return ret;
126 }
127
128 void ENGINE_load_rdrand (void)
129 {
130 extern unsigned int OPENSSL_ia32cap_P[];
131
132 if (OPENSSL_ia32cap_P[1] & (1<<(62-32)))
133 {
134 ENGINE *toadd = ENGINE_rdrand();
135 if(!toadd) return;
136 ENGINE_add(toadd);
137 ENGINE_free(toadd);
138 ERR_clear_error();
139 }
140 }
141 #else
142 void ENGINE_load_rdrand (void) {}
143 #endif