106 lines
3.3 KiB
C
106 lines
3.3 KiB
C
/*
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* AES-NI support functions
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*
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* Copyright (C) 2013, Brainspark B.V.
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*
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* This file is part of PolarSSL (http://www.polarssl.org)
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* Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
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*
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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/*
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* [AES-WP] http://software.intel.com/en-us/articles/intel-advanced-encryption-standard-aes-instructions-set
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*/
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#include "polarssl/config.h"
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#if defined(POLARSSL_AESNI_C)
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#include "polarssl/aesni.h"
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#include <stdio.h>
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#if defined(POLARSSL_HAVE_X86_64)
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/*
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* AES-NI support detection routine
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*/
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int aesni_supports( unsigned int what )
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{
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static int done = 0;
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static unsigned int c = 0;
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if( ! done )
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{
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asm( "movl $1, %%eax \n"
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"cpuid \n"
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: "=c" (c)
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:
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: "eax", "ebx", "edx" );
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done = 1;
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}
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return( ( c & what ) != 0 );
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}
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/*
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* AES-NI AES-ECB block en(de)cryption
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*/
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int aesni_crypt_ecb( aes_context *ctx,
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int mode,
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const unsigned char input[16],
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unsigned char output[16] )
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{
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asm( "movdqu (%3), %%xmm0 \n" // load input
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"movdqu (%1), %%xmm1 \n" // load round key 0
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"pxor %%xmm1, %%xmm0 \n" // round 0
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"addq $16, %1 \n" // point to next round key
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"subl $1, %0 \n" // normal rounds = nr - 1
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"test %2, %2 \n" // mode?
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"jz 2f \n" // 0 = decrypt
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"1: \n" // encryption loop
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"movdqu (%1), %%xmm1 \n" // load round key
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"aesenc %%xmm1, %%xmm0 \n" // do round
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"addq $16, %1 \n" // point to next round key
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"subl $1, %0 \n" // loop
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"jnz 1b \n"
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"movdqu (%1), %%xmm1 \n" // load round key
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"aesenclast %%xmm1, %%xmm0 \n" // last round
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"jmp 3f \n"
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"2: \n" // decryption loop
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"movdqu (%1), %%xmm1 \n"
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"aesdec %%xmm1, %%xmm0 \n"
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"addq $16, %1 \n"
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"subl $1, %0 \n"
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"jnz 2b \n"
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"movdqu (%1), %%xmm1 \n" // load round key
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"aesdeclast %%xmm1, %%xmm0 \n" // last round
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"3: \n"
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"movdqu %%xmm0, (%4) \n" // export output
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:
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: "r" (ctx->nr), "r" (ctx->rk), "r" (mode), "r" (input), "r" (output)
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: "memory", "cc", "xmm0", "xmm1" );
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return( 0 );
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}
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#endif /* POLARSSL_HAVE_X86_64 */
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#endif /* POLARSSL_AESNI_C */
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