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      1 /*
      2  * Copyright 2011-2018 The OpenSSL Project Authors. All Rights Reserved.
      3  *
      4  * Licensed under the OpenSSL license (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
      8  */
      9 
     10 #include <openssl/opensslconf.h>
     11 
     12 #include <stdio.h>
     13 #include <string.h>
     14 #include "crypto/engine.h"
     15 #include <openssl/rand.h>
     16 #include <openssl/err.h>
     17 #include <openssl/crypto.h>
     18 
     19 #if (defined(__i386)   || defined(__i386__)   || defined(_M_IX86) || \
     20      defined(__x86_64) || defined(__x86_64__) || \
     21      defined(_M_AMD64) || defined (_M_X64)) && defined(OPENSSL_CPUID_OBJ)
     22 
     23 size_t OPENSSL_ia32_rdrand_bytes(unsigned char *buf, size_t len);
     24 
     25 static int get_random_bytes(unsigned char *buf, int num)
     26 {
     27     if (num < 0) {
     28         return 0;
     29     }
     30 
     31     return (size_t)num == OPENSSL_ia32_rdrand_bytes(buf, (size_t)num);
     32 }
     33 
     34 static int random_status(void)
     35 {
     36     return 1;
     37 }
     38 
     39 static RAND_METHOD rdrand_meth = {
     40     NULL,                       /* seed */
     41     get_random_bytes,
     42     NULL,                       /* cleanup */
     43     NULL,                       /* add */
     44     get_random_bytes,
     45     random_status,
     46 };
     47 
     48 static int rdrand_init(ENGINE *e)
     49 {
     50     return 1;
     51 }
     52 
     53 static const char *engine_e_rdrand_id = "rdrand";
     54 static const char *engine_e_rdrand_name = "Intel RDRAND engine";
     55 
     56 static int bind_helper(ENGINE *e)
     57 {
     58     if (!ENGINE_set_id(e, engine_e_rdrand_id) ||
     59         !ENGINE_set_name(e, engine_e_rdrand_name) ||
     60         !ENGINE_set_flags(e, ENGINE_FLAGS_NO_REGISTER_ALL) ||
     61         !ENGINE_set_init_function(e, rdrand_init) ||
     62         !ENGINE_set_RAND(e, &rdrand_meth))
     63         return 0;
     64 
     65     return 1;
     66 }
     67 
     68 static ENGINE *ENGINE_rdrand(void)
     69 {
     70     ENGINE *ret = ENGINE_new();
     71     if (ret == NULL)
     72         return NULL;
     73     if (!bind_helper(ret)) {
     74         ENGINE_free(ret);
     75         return NULL;
     76     }
     77     return ret;
     78 }
     79 
     80 void engine_load_rdrand_int(void)
     81 {
     82     extern unsigned int OPENSSL_ia32cap_P[];
     83 
     84     if (OPENSSL_ia32cap_P[1] & (1 << (62 - 32))) {
     85         ENGINE *toadd = ENGINE_rdrand();
     86         if (!toadd)
     87             return;
     88         ENGINE_add(toadd);
     89         ENGINE_free(toadd);
     90         ERR_clear_error();
     91     }
     92 }
     93 #else
     94 void engine_load_rdrand_int(void)
     95 {
     96 }
     97 #endif
     98