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/*
* Copyright (C) 2008 Martin Willi
* Hochschule fuer Technik Rapperswil
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*/
#include "padlock_plugin.h"
#include "padlock_aes_crypter.h"
#include "padlock_sha1_hasher.h"
#include "padlock_rng.h"
#include <stdio.h>
#include <library.h>
#include <debug.h>
typedef struct private_padlock_plugin_t private_padlock_plugin_t;
typedef enum padlock_feature_t padlock_feature_t;
/**
* Feature flags of padlock, received via cpuid()
*/
enum padlock_feature_t {
PADLOCK_RESERVED_1 = (1<<0),
PADLOCK_RESERVED_2 = (1<<1),
PADLOCK_RNG_AVAILABLE = (1<<2),
PADLOCK_RNG_ENABLED = (1<<3),
PADLOCK_RESERVED_3 = (1<<4),
PADLOCK_RESERVED_4 = (1<<5),
PADLOCK_ACE_AVAILABLE = (1<<6),
PADLOCK_ACE_ENABLED = (1<<7),
PADLOCK_ACE2_AVAILABLE = (1<<8),
PADLOCK_ACE2_ENABLED = (1<<9),
PADLOCK_PHE_AVAILABLE = (1<<10),
PADLOCK_PHE_ENABLED = (1<<11),
PADLOCK_PMM_AVAILABLE = (1<<12),
PADLOCK_PMM_ENABLED = (1<<13),
};
/**
* private data of aes_plugin
*/
struct private_padlock_plugin_t {
/**
* public functions
*/
padlock_plugin_t public;
/**
* features supported by Padlock
*/
padlock_feature_t features;
};
/**
* Get cpuid for info, return eax, ebx, ecx and edx. -fPIC requires to save ebx.
*/
#define cpuid(op, a, b, c, d)\
asm (\
"pushl %%ebx \n\t"\
"cpuid \n\t"\
"movl %%ebx, %1 \n\t"\
"popl %%ebx \n\t"\
: "=a" (a), "=r" (b), "=c" (c), "=d" (d) \
: "a" (op));
/**
* Get features supported by Padlock
*/
static padlock_feature_t get_padlock_features()
{
char vendor[3 * sizeof(int) + 1];
int a, b, c, d;
cpuid(0, a, b, c, d);
/* VendorID string is in b-d-c (yes, in this order) */
snprintf(vendor, sizeof(vendor), "%.4s%.4s%.4s", &b, &d, &c);
/* check if we have a VIA chip */
if (streq(vendor, "CentaurHauls"))
{
cpuid(0xC0000000, a, b, c, d);
/* check Centaur Extended Feature Flags */
if (a >= 0xC0000001)
{
cpuid(0xC0000001, a, b, c, d);
return d;
}
}
DBG1(DBG_LIB, "Padlock not found, CPU is %s", vendor);
return 0;
}
METHOD(plugin_t, destroy, void,
private_padlock_plugin_t *this)
{
if (this->features & PADLOCK_RNG_ENABLED)
{
lib->crypto->remove_rng(lib->crypto,
(rng_constructor_t)padlock_rng_create);
lib->crypto->remove_rng(lib->crypto,
(rng_constructor_t)padlock_rng_create);
lib->crypto->remove_rng(lib->crypto,
(rng_constructor_t)padlock_rng_create);
}
if (this->features & PADLOCK_ACE2_ENABLED)
{
lib->crypto->remove_crypter(lib->crypto,
(crypter_constructor_t)padlock_aes_crypter_create);
}
if (this->features & PADLOCK_PHE_ENABLED)
{
lib->crypto->remove_hasher(lib->crypto,
(hasher_constructor_t)padlock_sha1_hasher_create);
}
free(this);
}
/*
* see header file
*/
plugin_t *padlock_plugin_create()
{
private_padlock_plugin_t *this;
INIT(this,
.public = {
.plugin = {
.destroy = _destroy,
},
},
.features = get_padlock_features(),
);
if (!this->features)
{
free(this);
return NULL;
}
DBG1(DBG_LIB, "Padlock found, supports:%s%s%s%s%s, enabled:%s%s%s%s%s",
this->features & PADLOCK_RNG_AVAILABLE ? " RNG" : "",
this->features & PADLOCK_ACE_AVAILABLE ? " ACE" : "",
this->features & PADLOCK_ACE2_AVAILABLE ? " ACE2" : "",
this->features & PADLOCK_PHE_AVAILABLE ? " PHE" : "",
this->features & PADLOCK_PMM_AVAILABLE ? " PMM" : "",
this->features & PADLOCK_RNG_ENABLED ? " RNG" : "",
this->features & PADLOCK_ACE_ENABLED ? " ACE" : "",
this->features & PADLOCK_ACE2_ENABLED ? " ACE2" : "",
this->features & PADLOCK_PHE_ENABLED ? " PHE" : "",
this->features & PADLOCK_PMM_ENABLED ? " PMM" : "");
if (this->features & PADLOCK_RNG_ENABLED)
{
lib->crypto->add_rng(lib->crypto, RNG_TRUE,
(rng_constructor_t)padlock_rng_create);
lib->crypto->add_rng(lib->crypto, RNG_STRONG,
(rng_constructor_t)padlock_rng_create);
lib->crypto->add_rng(lib->crypto, RNG_WEAK,
(rng_constructor_t)padlock_rng_create);
}
if (this->features & PADLOCK_ACE2_ENABLED)
{
lib->crypto->add_crypter(lib->crypto, ENCR_AES_CBC,
(crypter_constructor_t)padlock_aes_crypter_create);
}
if (this->features & PADLOCK_PHE_ENABLED)
{
lib->crypto->add_hasher(lib->crypto, HASH_SHA1,
(hasher_constructor_t)padlock_sha1_hasher_create);
}
return &this->public.plugin;
}
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