| 1 | /*
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| 2 | * Copyright 2011-2018 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the OpenSSL license (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | #include <openssl/opensslconf.h>
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| 11 |
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| 12 | #include <stdio.h>
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| 13 | #include <string.h>
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| 14 | #include "crypto/engine.h"
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| 15 | #include <openssl/rand.h>
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| 16 | #include <openssl/err.h>
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| 17 | #include <openssl/crypto.h>
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| 18 |
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| 19 | #if (defined(__i386) || defined(__i386__) || defined(_M_IX86) || \
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| 20 | defined(__x86_64) || defined(__x86_64__) || \
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| 21 | defined(_M_AMD64) || defined (_M_X64)) && defined(OPENSSL_CPUID_OBJ)
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| 22 |
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| 23 | size_t OPENSSL_ia32_rdrand_bytes(unsigned char *buf, size_t len);
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| 24 |
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| 25 | static int get_random_bytes(unsigned char *buf, int num)
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| 26 | {
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| 27 | if (num < 0) {
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| 28 | return 0;
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| 29 | }
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| 30 |
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| 31 | return (size_t)num == OPENSSL_ia32_rdrand_bytes(buf, (size_t)num);
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| 32 | }
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| 33 |
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| 34 | static int random_status(void)
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| 35 | {
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| 36 | return 1;
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| 37 | }
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| 38 |
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| 39 | static RAND_METHOD rdrand_meth = {
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| 40 | NULL, /* seed */
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| 41 | get_random_bytes,
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| 42 | NULL, /* cleanup */
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| 43 | NULL, /* add */
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| 44 | get_random_bytes,
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| 45 | random_status,
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| 46 | };
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| 47 |
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| 48 | static int rdrand_init(ENGINE *e)
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| 49 | {
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| 50 | return 1;
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| 51 | }
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| 52 |
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| 53 | static const char *engine_e_rdrand_id = "rdrand";
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| 54 | static const char *engine_e_rdrand_name = "Intel RDRAND engine";
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| 55 |
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| 56 | static int bind_helper(ENGINE *e)
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| 57 | {
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| 58 | if (!ENGINE_set_id(e, engine_e_rdrand_id) ||
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| 59 | !ENGINE_set_name(e, engine_e_rdrand_name) ||
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| 60 | !ENGINE_set_flags(e, ENGINE_FLAGS_NO_REGISTER_ALL) ||
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| 61 | !ENGINE_set_init_function(e, rdrand_init) ||
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| 62 | !ENGINE_set_RAND(e, &rdrand_meth))
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| 63 | return 0;
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| 64 |
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| 65 | return 1;
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| 66 | }
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| 67 |
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| 68 | static ENGINE *ENGINE_rdrand(void)
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| 69 | {
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| 70 | ENGINE *ret = ENGINE_new();
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| 71 | if (ret == NULL)
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| 72 | return NULL;
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| 73 | if (!bind_helper(ret)) {
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| 74 | ENGINE_free(ret);
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| 75 | return NULL;
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| 76 | }
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| 77 | return ret;
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| 78 | }
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| 79 |
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| 80 | void engine_load_rdrand_int(void)
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| 81 | {
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| 82 | extern unsigned int OPENSSL_ia32cap_P[];
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| 83 |
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| 84 | if (OPENSSL_ia32cap_P[1] & (1 << (62 - 32))) {
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| 85 | ENGINE *toadd = ENGINE_rdrand();
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| 86 | if (!toadd)
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| 87 | return;
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| 88 | ENGINE_add(toadd);
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| 89 | ENGINE_free(toadd);
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| 90 | ERR_clear_error();
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| 91 | }
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| 92 | }
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| 93 | #else
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| 94 | void engine_load_rdrand_int(void)
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| 95 | {
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| 96 | }
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| 97 | #endif
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