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rijndael-padlock.c
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rijndael-padlock.c
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/* Padlock accelerated AES for Libgcrypt
* Copyright (C) 2000, 2001, 2002, 2003, 2007,
* 2008, 2011, 2012 Free Software Foundation, Inc.
*
* This file is part of Libgcrypt.
*
* Libgcrypt is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* Libgcrypt 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h> /* for memcmp() */
#include "types.h" /* for byte and u32 typedefs */
#include "g10lib.h"
#include "cipher.h"
#include "bufhelp.h"
#include "cipher-selftest.h"
#include "rijndael-internal.h"
#ifdef USE_PADLOCK
/* Encrypt or decrypt one block using the padlock engine. A and B may
be the same. */
static unsigned int
do_padlock (const RIJNDAEL_context *ctx, unsigned char *bx,
const unsigned char *ax, int decrypt_flag)
{
/* BX and AX are not necessary correctly aligned. Thus we need to
copy them here. */
unsigned char a[16] __attribute__ ((aligned (16)));
unsigned char b[16] __attribute__ ((aligned (16)));
unsigned int cword[4] __attribute__ ((aligned (16)));
int blocks;
/* The control word fields are:
127:12 11:10 9 8 7 6 5 4 3:0
RESERVED KSIZE CRYPT INTER KEYGN CIPHR ALIGN DGEST ROUND */
cword[0] = (ctx->rounds & 15); /* (The mask is just a safeguard.) */
cword[1] = 0;
cword[2] = 0;
cword[3] = 0;
if (decrypt_flag)
cword[0] |= 0x00000200;
memcpy (a, ax, 16);
blocks = 1; /* Init counter for just one block. */
#ifdef __x86_64__
asm volatile
("pushfq\n\t" /* Force key reload. */
"popfq\n\t"
".byte 0xf3, 0x0f, 0xa7, 0xc8\n\t" /* REP XCRYPT ECB. */
: /* No output */
: "S" (a), "D" (b), "d" (cword), "b" (ctx->padlockkey), "c" (blocks)
: "cc", "memory"
);
#else
asm volatile
("pushfl\n\t" /* Force key reload. */
"popfl\n\t"
"xchg %3, %%ebx\n\t" /* Load key. */
".byte 0xf3, 0x0f, 0xa7, 0xc8\n\t" /* REP XCRYPT ECB. */
"xchg %3, %%ebx\n" /* Restore GOT register. */
: /* No output */
: "S" (a), "D" (b), "d" (cword), "r" (ctx->padlockkey), "c" (blocks)
: "cc", "memory"
);
#endif
memcpy (bx, b, 16);
return (48 + 15 /* possible padding for alignment */);
}
unsigned int
_gcry_aes_padlock_encrypt (const RIJNDAEL_context *ctx,
unsigned char *bx, const unsigned char *ax)
{
return do_padlock(ctx, bx, ax, 0);
}
unsigned int
_gcry_aes_padlock_decrypt (const RIJNDAEL_context *ctx,
unsigned char *bx, const unsigned char *ax)
{
return do_padlock(ctx, bx, ax, 1);
}
#endif /* USE_PADLOCK */

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