2013-01-04 13:33:45 +00:00
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/*
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* Copyright (C) 2012 Martin Willi
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* Copyright (C) 2012 revosec AG
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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#include "rdrand_plugin.h"
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2013-01-04 14:33:10 +00:00
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#include "rdrand_rng.h"
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2013-01-04 13:33:45 +00:00
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#include <stdio.h>
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#include <library.h>
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#include <utils/debug.h>
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typedef struct private_rdrand_plugin_t private_rdrand_plugin_t;
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typedef enum cpuid_feature_t cpuid_feature_t;
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/**
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* private data of rdrand_plugin
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*/
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struct private_rdrand_plugin_t {
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/**
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* public functions
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*/
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rdrand_plugin_t public;
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};
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/**
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* CPU feature flags, returned via cpuid(1)
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*/
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enum cpuid_feature_t {
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CPUID_RDRAND = (1<<30),
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};
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/**
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* Get cpuid for info, return eax, ebx, ecx and edx.
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* -fPIC requires to save ebx on IA-32.
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*/
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static void cpuid(u_int op, u_int *a, u_int *b, u_int *c, u_int *d)
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{
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#ifdef __x86_64__
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asm("cpuid" : "=a" (*a), "=b" (*b), "=c" (*c), "=d" (*d) : "a" (op));
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#else /* __i386__ */
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asm("pushl %%ebx;"
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"cpuid;"
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"movl %%ebx, %1;"
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"popl %%ebx;"
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: "=a" (*a), "=r" (*b), "=c" (*c), "=d" (*d) : "a" (op));
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#endif /* __x86_64__ / __i386__*/
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}
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/**
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* Check if we have RDRAND instruction
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*/
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static bool have_rdrand()
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{
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char vendor[3 * sizeof(u_int32_t) + 1];
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u_int a, b, c, d;
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cpuid(0, &a, &b, &c, &d);
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/* VendorID string is in b-d-c (yes, in this order) */
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snprintf(vendor, sizeof(vendor), "%.4s%.4s%.4s", &b, &d, &c);
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/* check if we have an Intel CPU */
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if (streq(vendor, "GenuineIntel"))
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{
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cpuid(1, &a, &b, &c, &d);
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if (c & CPUID_RDRAND)
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{
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2014-02-10 10:07:50 +00:00
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DBG2(DBG_LIB, "detected RDRAND support on %s CPU", vendor);
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2013-01-04 13:33:45 +00:00
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return TRUE;
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}
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}
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2014-02-10 10:07:50 +00:00
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DBG2(DBG_LIB, "no RDRAND support on %s CPU, disabled", vendor);
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2013-01-04 13:33:45 +00:00
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return FALSE;
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}
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METHOD(plugin_t, get_name, char*,
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private_rdrand_plugin_t *this)
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{
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return "rdrand";
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}
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2013-01-04 14:33:10 +00:00
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METHOD(plugin_t, get_features, int,
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private_rdrand_plugin_t *this, plugin_feature_t *features[])
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{
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static plugin_feature_t f[] = {
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PLUGIN_REGISTER(RNG, rdrand_rng_create),
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PLUGIN_PROVIDE(RNG, RNG_WEAK),
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2013-01-04 15:07:31 +00:00
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PLUGIN_PROVIDE(RNG, RNG_STRONG),
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2013-01-04 16:34:07 +00:00
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PLUGIN_PROVIDE(RNG, RNG_TRUE),
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PLUGIN_DEPENDS(CRYPTER, ENCR_AES_CBC, 16),
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2013-01-04 14:33:10 +00:00
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};
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*features = f;
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2014-02-10 10:21:09 +00:00
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if (have_rdrand())
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{
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return countof(f);
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}
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return 0;
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2013-01-04 14:33:10 +00:00
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}
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2013-01-04 13:33:45 +00:00
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METHOD(plugin_t, destroy, void,
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private_rdrand_plugin_t *this)
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{
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free(this);
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}
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/*
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* see header file
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*/
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plugin_t *rdrand_plugin_create()
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{
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private_rdrand_plugin_t *this;
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INIT(this,
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.public = {
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.plugin = {
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.get_name = _get_name,
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2014-02-10 10:21:09 +00:00
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.get_features = _get_features,
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2013-01-04 13:33:45 +00:00
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.reload = (void*)return_false,
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.destroy = _destroy,
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},
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},
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);
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return &this->public.plugin;
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}
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