2 * Copyright 2011-2018 The OpenSSL Project Authors. All Rights Reserved.
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
10 #include <openssl/opensslconf.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>
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)
24 size_t OPENSSL_ia32_rdrand_bytes(unsigned char *buf, size_t len);
26 static int get_random_bytes(unsigned char *buf, int num)
32 return (size_t)num == OPENSSL_ia32_rdrand_bytes(buf, (size_t)num);
35 static int random_status(void)
40 static RAND_METHOD rdrand_meth = {
49 static int rdrand_init(ENGINE *e)
54 static const char *engine_e_rdrand_id = "rdrand";
55 static const char *engine_e_rdrand_name = "Intel RDRAND engine";
57 static int bind_helper(ENGINE *e)
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))
69 static ENGINE *ENGINE_rdrand(void)
71 ENGINE *ret = ENGINE_new();
74 if (!bind_helper(ret)) {
81 void engine_load_rdrand_int(void)
83 if (OPENSSL_ia32cap_P[1] & (1 << (62 - 32))) {
84 ENGINE *toadd = ENGINE_rdrand();
93 void engine_load_rdrand_int(void)