62 lines
1.7 KiB
C
62 lines
1.7 KiB
C
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/*
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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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#if defined(POLARSSL_HAVE_X86_64)
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/*
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* AES-NI support detection routine, [AES-WP] figure 23
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*/
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int aesni_supported( void )
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{
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static int supported = -1;
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unsigned int c;
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if( supported == -1 )
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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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supported = ( ( c & 0x02000000 ) != 0 );
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}
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return( supported );
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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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