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https://github.com/openssl/openssl.git
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111 lines
2.5 KiB
C
111 lines
2.5 KiB
C
/*
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* Copyright 2011-2016 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (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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#include <openssl/opensslconf.h>
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#include <stdio.h>
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#include <string.h>
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#include <internal/engine.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(__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)
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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)
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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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{
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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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extern unsigned int OPENSSL_ia32cap_P[];
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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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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_int(void)
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{
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}
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#endif
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