143 lines
4.2 KiB
C
143 lines
4.2 KiB
C
/* ====================================================================
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* Copyright (c) 2011 The OpenSSL Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* licensing@OpenSSL.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*/
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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 <openssl/engine.h>
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#include <openssl/rand.h>
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#include <openssl/err.h>
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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(void);
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static int get_random_bytes (unsigned char *buf, int num)
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{
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size_t rnd;
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while (num>=(int)sizeof(size_t)) {
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if ((rnd = OPENSSL_ia32_rdrand()) == 0) return 0;
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*((size_t *)buf) = rnd;
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buf += sizeof(size_t);
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num -= sizeof(size_t);
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}
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if (num) {
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if ((rnd = OPENSSL_ia32_rdrand()) == 0) return 0;
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memcpy (buf,&rnd,num);
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}
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return 1;
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}
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static int random_status (void)
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{ return 1; }
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static RAND_METHOD rdrand_meth =
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{
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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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{ return 1; }
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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)
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return NULL;
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if(!bind_helper(ret))
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{
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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 (void)
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{
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extern unsigned int OPENSSL_ia32cap_P[];
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if (OPENSSL_ia32cap_P[1] & (1<<(62-32)))
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{
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ENGINE *toadd = ENGINE_rdrand();
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if(!toadd) return;
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ENGINE_add(toadd);
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ENGINE_free(toadd);
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ERR_clear_error();
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}
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}
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#else
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void ENGINE_load_rdrand (void) {}
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#endif
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