Add files for (upcoming) AES-NI support

library/aesni.c

@@ -0,0 +1,61 @@
+/*
+ *  AES-NI support functions
+ *
+ *  Copyright (C) 2013, Brainspark B.V.
+ *
+ *  This file is part of PolarSSL (http://www.polarssl.org)
+ *  Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
+ *
+ *  All rights reserved.
+ *
+ *  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.
+ *
+ *  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.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+/*
+ * [AES-WP] http://software.intel.com/en-us/articles/intel-advanced-encryption-standard-aes-instructions-set
+ */
+
+#include "polarssl/config.h"
+
+#if defined(POLARSSL_AESNI_C)
+
+#include "polarssl/aesni.h"
+
+#if defined(POLARSSL_HAVE_X86_64)
+
+/*
+ * AES-NI support detection routine, [AES-WP] figure 23
+ */
+int aesni_supported( void )
+{
+    static int supported = -1;
+    unsigned int c;
+
+    if( supported == -1 )
+    {
+        asm( "movl  $1, %%eax   \n"
+             "cpuid             \n"
+             : "=c" (c)
+             :
+             : "eax", "ebx", "edx" );
+        supported = ( ( c & 0x02000000 ) != 0 );
+    }
+
+    return( supported );
+}
+
+#endif /* POLARSSL_HAVE_X86_64 */
+
+#endif /* POLARSSL_AESNI_C */