1 /* ====================================================================
2 * Copyright (c) 2011 The OpenSSL Project. All rights reserved.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
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
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/)"
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.
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.
30 * 6. Redistributions of any form whatsoever must retain the following
32 * "This product includes software developed by the OpenSSL Project
33 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
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 * ====================================================================
50 #include <openssl/opensslconf.h>
54 #include <openssl/engine.h>
56 #if (defined(__i386) || defined(__i386__) || defined(_M_IX86) || \
57 defined(__x86_64) || defined(__x86_64__) || \
58 defined(_M_AMD64) || defined (_M_X64)) && !defined(OPENSSL_NO_ASM)
60 size_t OPENSSL_ia32_rdrand(void);
62 static int get_random_bytes (unsigned char *buf, size_t num)
66 while (num>=sizeof(size_t)) {
67 if ((rnd = OPENSSL_ia32_rdrand()) == 0) return 0;
69 *((size_t *)buf) = rnd;
70 buf += sizeof(size_t);
71 num -= sizeof(size_t);
74 if ((rnd = OPENSSL_ia32_rdrand()) == 0) return 0;
76 memcpy (buf,&rnd,num);
82 static int random_status (void)
85 static RAND_METHOD rdrand_meth =
95 static int rdrand_init(ENGINE *e)
98 static const char *engine_e_rdrand_id = "rdrand";
99 static const char *engine_e_rdrand_name = "Intel RDRAND engine";
101 static int bind_helper(ENGINE *e)
103 if (!ENGINE_set_id(e, engine_e_rdrand_id) ||
104 !ENGINE_set_name(e, engine_e_rdrand_name) ||
105 !ENGINE_set_init_function(e, rdrand_init) ||
106 !ENGINE_set_RAND(e, &rdrand_meth) )
112 static ENGINE *ENGINE_rdrand(void)
114 ENGINE *ret = ENGINE_new();
117 if(!bind_helper(ret))
125 void ENGINE_load_rdrand (void)
127 extern OPENSSL_ia32cap_P[];
129 if (OPENSSL_ia32cap_P[1] & (1<<(62-32)))
131 ENGINE *toadd = ENGINE_rdrand();
139 void ENGINE_load_rdrand (void) {}