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/*
* Copyright 2011-2018 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the OpenSSL license (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <openssl/opensslconf.h>
#include <stdio.h>
#include <string.h>
#include "crypto/engine.h"
#include <openssl/rand.h>
#include <openssl/err.h>
#include <openssl/crypto.h>
#if defined(__has_feature)
# if __has_feature(memory_sanitizer)
# include <sanitizer/msan_interface.h>
# endif
#endif
#if (defined(__i386) || defined(__i386__) || defined(_M_IX86) || \
defined(__x86_64) || defined(__x86_64__) || \
defined(_M_AMD64) || defined (_M_X64)) && defined(OPENSSL_CPUID_OBJ)
size_t OPENSSL_ia32_rdrand_bytes(unsigned char *buf, size_t len);
static int get_random_bytes(unsigned char *buf, int num)
{
if (num < 0) {
return 0;
}
# if defined(__has_feature)
# if __has_feature(memory_sanitizer)
/*
* MemorySanitizer fails to understand asm and produces false positive
* use-of-uninitialized-value warnings.
*/
__msan_unpoison(buf, num);
# endif
# endif
return (size_t)num == OPENSSL_ia32_rdrand_bytes(buf, (size_t)num);
}
static int random_status(void)
{
return 1;
}
static RAND_METHOD rdrand_meth = {
NULL, /* seed */
get_random_bytes,
NULL, /* cleanup */
NULL, /* add */
get_random_bytes,
random_status,
};
static int rdrand_init(ENGINE *e)
{
return 1;
}
static const char *engine_e_rdrand_id = "rdrand";
static const char *engine_e_rdrand_name = "Intel RDRAND engine";
static int bind_helper(ENGINE *e)
{
if (!ENGINE_set_id(e, engine_e_rdrand_id) ||
!ENGINE_set_name(e, engine_e_rdrand_name) ||
!ENGINE_set_flags(e, ENGINE_FLAGS_NO_REGISTER_ALL) ||
!ENGINE_set_init_function(e, rdrand_init) ||
!ENGINE_set_RAND(e, &rdrand_meth))
return 0;
return 1;
}
static ENGINE *ENGINE_rdrand(void)
{
ENGINE *ret = ENGINE_new();
if (ret == NULL)
return NULL;
if (!bind_helper(ret)) {
ENGINE_free(ret);
return NULL;
}
return ret;
}
void engine_load_rdrand_int(void)
{
extern unsigned int OPENSSL_ia32cap_P[];
if (OPENSSL_ia32cap_P[1] & (1 << (62 - 32))) {
ENGINE *toadd = ENGINE_rdrand();
if (!toadd)
return;
ENGINE_add(toadd);
ENGINE_free(toadd);
ERR_clear_error();
}
}
#else
void engine_load_rdrand_int(void)
{
}
#endif
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