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/* ====================================================================
* Copyright (c) 2011 The OpenSSL Project. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
*
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* licensing@OpenSSL.org.
*
* 5. Products derived from this software may not be called "OpenSSL"
* nor may "OpenSSL" appear in their names without prior written
* permission of the OpenSSL Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
*
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
* ====================================================================
*/
#include <openssl/opensslconf.h>
#include <stdio.h>
#include <string.h>
#include <openssl/engine.h>
#include <openssl/rand.h>
#include <openssl/err.h>
#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(void);
static int get_random_bytes(unsigned char *buf, int num)
{
size_t rnd;
while (num >= (int)sizeof(size_t)) {
if ((rnd = OPENSSL_ia32_rdrand()) == 0)
return 0;
*((size_t *)buf) = rnd;
buf += sizeof(size_t);
num -= sizeof(size_t);
}
if (num) {
if ((rnd = OPENSSL_ia32_rdrand()) == 0)
return 0;
memcpy(buf, &rnd, num);
}
return 1;
}
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)
return NULL;
if (!bind_helper(ret)) {
ENGINE_free(ret);
return NULL;
}
return ret;
}
void ENGINE_load_rdrand(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(void)
{
}
#endif
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