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https://github.com/openssl/openssl.git
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126 lines
3.1 KiB
C
126 lines
3.1 KiB
C
/*
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* Copyright 2011-2023 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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/* We need to use some engine deprecated APIs */
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#define OPENSSL_SUPPRESS_DEPRECATED
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#include <openssl/opensslconf.h>
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#include <stdio.h>
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#include <string.h>
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#include "crypto/engine.h"
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#include "internal/cryptlib.h"
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#include <openssl/rand.h>
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#include <openssl/err.h>
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#include <openssl/crypto.h>
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#if defined(__has_feature)
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# if __has_feature(memory_sanitizer)
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# include <sanitizer/msan_interface.h>
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# endif
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#endif
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#if (defined(__i386) || defined(__i386__) || defined(_M_IX86) || \
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defined(__x86_64) || defined(__x86_64__) || \
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defined(_M_AMD64) || defined (_M_X64)) && defined(OPENSSL_CPUID_OBJ)
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size_t OPENSSL_ia32_rdrand_bytes(unsigned char *buf, size_t len);
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static int get_random_bytes(unsigned char *buf, int num)
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{
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if (num < 0) {
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return 0;
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}
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# if defined(__has_feature)
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# if __has_feature(memory_sanitizer)
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/*
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* MemorySanitizer fails to understand asm and produces false positive
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* use-of-uninitialized-value warnings.
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*/
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__msan_unpoison(buf, num);
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# endif
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# endif
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return (size_t)num == OPENSSL_ia32_rdrand_bytes(buf, (size_t)num);
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}
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static int random_status(void)
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{
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return 1;
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}
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static RAND_METHOD rdrand_meth = {
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NULL, /* seed */
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get_random_bytes,
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NULL, /* cleanup */
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NULL, /* add */
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get_random_bytes,
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random_status,
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};
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static int rdrand_init(ENGINE *e)
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{
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return 1;
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}
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static const char *engine_e_rdrand_id = "rdrand";
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static const char *engine_e_rdrand_name = "Intel RDRAND engine";
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static int bind_helper(ENGINE *e)
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{
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if (!ENGINE_set_id(e, engine_e_rdrand_id) ||
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!ENGINE_set_name(e, engine_e_rdrand_name) ||
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!ENGINE_set_flags(e, ENGINE_FLAGS_NO_REGISTER_ALL) ||
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!ENGINE_set_init_function(e, rdrand_init) ||
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!ENGINE_set_RAND(e, &rdrand_meth))
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return 0;
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return 1;
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}
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static ENGINE *ENGINE_rdrand(void)
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{
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ENGINE *ret = ENGINE_new();
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if (ret == NULL)
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return NULL;
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if (!bind_helper(ret)) {
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ENGINE_free(ret);
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return NULL;
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}
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return ret;
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}
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void engine_load_rdrand_int(void)
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{
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if (OPENSSL_ia32cap_P[1] & (1 << (62 - 32))) {
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ENGINE *toadd = ENGINE_rdrand();
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if (!toadd)
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return;
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ERR_set_mark();
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ENGINE_add(toadd);
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/*
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* If the "add" worked, it gets a structural reference. So either way, we
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* release our just-created reference.
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*/
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ENGINE_free(toadd);
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/*
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* If the "add" didn't work, it was probably a conflict because it was
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* already added (eg. someone calling ENGINE_load_blah then calling
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* ENGINE_load_builtin_engines() perhaps).
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*/
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ERR_pop_to_mark();
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}
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}
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#else
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void engine_load_rdrand_int(void)
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{
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}
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#endif
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