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/*
* Copyright (C) 2008 Thomas Kallenberg
* 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_aes_crypter.h"
#include <stdio.h>
#define AES_BLOCK_SIZE 16
#define PADLOCK_ALIGN __attribute__ ((__aligned__(16)))
typedef struct private_padlock_aes_crypter_t private_padlock_aes_crypter_t;
/**
* Private data of padlock_aes_crypter_t
*/
struct private_padlock_aes_crypter_t {
/**
* Public part of this class.
*/
padlock_aes_crypter_t public;
/*
* the key
*/
chunk_t key;
};
/**
* Control word structure to pass to crypt operations
*/
typedef struct {
u_int __attribute__ ((__packed__))
rounds:4,
algo:3,
keygen:1,
interm:1,
encdec:1,
ksize:2;
/* microcode needs additional bytes for calculation */
u_char buf[124];
} cword;
/**
* Invoke the actual de/encryption
*/
static void padlock_crypt(void *key, void *ctrl, void *src, void *dst,
int count, void *iv)
{
asm volatile(
"pushl %%eax\n pushl %%ebx\n pushl %%ecx\n"
"pushl %%edx\n pushl %%esi\n pushl %%edi\n"
"pushfl\n popfl\n"
"movl %0, %%eax\n"
"movl %1, %%ebx\n"
"movl %2, %%ecx\n"
"movl %3, %%edx\n"
"movl %4, %%esi\n"
"movl %5, %%edi\n"
"rep\n"
".byte 0x0f, 0xa7, 0xd0\n"
"popl %%edi\n popl %%esi\n popl %%edx\n"
"popl %%ecx\n popl %%ebx\n popl %%eax\n"
:
: "m"(iv),"m"(key), "m"(count), "m"(ctrl), "m"(src), "m"(dst)
: "eax", "ecx", "edx", "esi", "edi");
}
/**
* Do encryption/decryption operation using Padlock control word
*/
static void crypt(private_padlock_aes_crypter_t *this, char *iv,
chunk_t src, chunk_t *dst, bool enc)
{
cword cword PADLOCK_ALIGN;
u_char key_aligned[256] PADLOCK_ALIGN;
u_char iv_aligned[16] PADLOCK_ALIGN;
memset(&cword, 0, sizeof(cword));
/* set encryption/decryption flag */
cword.encdec = enc;
/* calculate rounds and key size */
cword.rounds = 10 + (this->key.len - 16) / 4;
cword.ksize = (this->key.len - 16) / 8;
/* enable autoalign */
cword.algo |= 2;
/* move data to aligned buffers */
memcpy(iv_aligned, iv, sizeof(iv_aligned));
memcpy(key_aligned, this->key.ptr, this->key.len);
*dst = chunk_alloc(src.len);
padlock_crypt(key_aligned, &cword, src.ptr, dst->ptr,
src.len / AES_BLOCK_SIZE, iv_aligned);
memwipe(key_aligned, sizeof(key_aligned));
}
METHOD(crypter_t, decrypt, void,
private_padlock_aes_crypter_t *this, chunk_t data, chunk_t iv, chunk_t *dst)
{
crypt(this, iv.ptr, data, dst, TRUE);
}
METHOD(crypter_t, encrypt, void,
private_padlock_aes_crypter_t *this, chunk_t data, chunk_t iv, chunk_t *dst)
{
crypt(this, iv.ptr, data, dst, FALSE);
}
METHOD(crypter_t, get_block_size, size_t,
private_padlock_aes_crypter_t *this)
{
return AES_BLOCK_SIZE;
}
METHOD(crypter_t, get_iv_size, size_t,
private_padlock_aes_crypter_t *this)
{
return AES_BLOCK_SIZE;
}
METHOD(crypter_t, get_key_size, size_t,
private_padlock_aes_crypter_t *this)
{
return this->key.len;
}
METHOD(crypter_t, set_key, void,
private_padlock_aes_crypter_t *this, chunk_t key)
{
memcpy(this->key.ptr, key.ptr, min(key.len, this->key.len));
}
METHOD(crypter_t, destroy, void,
private_padlock_aes_crypter_t *this)
{
chunk_clear(&this->key);
free(this);
}
/*
* Described in header
*/
padlock_aes_crypter_t *padlock_aes_crypter_create(encryption_algorithm_t algo,
size_t key_size)
{
private_padlock_aes_crypter_t *this;
if (algo != ENCR_AES_CBC)
{
return NULL;
}
switch (key_size)
{
case 0:
key_size = 16;
/* FALL */
case 16: /* AES 128 */
break;
case 24: /* AES-192 */
case 32: /* AES-256 */
/* These need an expanded key, currently not supported, FALL */
default:
return NULL;
}
INIT(this,
.public = {
.crypter = {
.encrypt = _encrypt,
.decrypt = _decrypt,
.get_block_size = _get_block_size,
.get_iv_size = _get_iv_size,
.get_key_size = _get_key_size,
.set_key = _set_key,
.destroy = _destroy,
},
},
.key = chunk_alloc(key_size),
);
return &this->public;
}
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