162 lines
4.5 KiB
C
162 lines
4.5 KiB
C
/*
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* VIA PadLock support functions
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*
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* Copyright (C) 2006-2009, Paul Bakker <polarssl_maintainer at polarssl.org>
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* All rights reserved.
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*
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* Joined copyright on original XySSL code with: Christophe Devine
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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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* This implementation is based on the VIA PadLock Programming Guide:
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*
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* http://www.via.com.tw/en/downloads/whitepapers/initiatives/padlock/
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* programming_guide.pdf
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*/
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#include "polarssl/config.h"
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#if defined(POLARSSL_PADLOCK_C)
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#include "polarssl/aes.h"
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#include "polarssl/padlock.h"
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#if defined(POLARSSL_HAVE_X86)
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#include <string.h>
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/*
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* PadLock detection routine
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*/
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int padlock_supports( int feature )
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{
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static int flags = -1;
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int ebx, edx;
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if( flags == -1 )
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{
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asm( "movl %%ebx, %0 \n" \
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"movl $0xC0000000, %%eax \n" \
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"cpuid \n" \
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"cmpl $0xC0000001, %%eax \n" \
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"movl $0, %%edx \n" \
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"jb unsupported \n" \
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"movl $0xC0000001, %%eax \n" \
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"cpuid \n" \
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"unsupported: \n" \
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"movl %%edx, %1 \n" \
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"movl %2, %%ebx \n"
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: "=m" (ebx), "=m" (edx)
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: "m" (ebx)
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: "eax", "ecx", "edx" );
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flags = edx;
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}
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return( flags & feature );
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}
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/*
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* PadLock AES-ECB block en(de)cryption
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*/
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int padlock_xcryptecb( aes_context *ctx,
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int mode,
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unsigned char input[16],
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unsigned char output[16] )
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{
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int ebx;
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unsigned long *rk;
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unsigned long *blk;
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unsigned long *ctrl;
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unsigned char buf[256];
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rk = ctx->rk;
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blk = PADLOCK_ALIGN16( buf );
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memcpy( blk, input, 16 );
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ctrl = blk + 4;
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*ctrl = 0x80 | ctx->nr | ( ( ctx->nr + ( mode^1 ) - 10 ) << 9 );
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asm( "pushfl; popfl \n" \
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"movl %%ebx, %0 \n" \
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"movl $1, %%ecx \n" \
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"movl %2, %%edx \n" \
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"movl %3, %%ebx \n" \
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"movl %4, %%esi \n" \
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"movl %4, %%edi \n" \
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".byte 0xf3,0x0f,0xa7,0xc8\n" \
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"movl %1, %%ebx \n"
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: "=m" (ebx)
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: "m" (ebx), "m" (ctrl), "m" (rk), "m" (blk)
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: "ecx", "edx", "esi", "edi" );
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memcpy( output, blk, 16 );
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return( 0 );
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}
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/*
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* PadLock AES-CBC buffer en(de)cryption
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*/
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int padlock_xcryptcbc( aes_context *ctx,
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int mode,
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int length,
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unsigned char iv[16],
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unsigned char *input,
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unsigned char *output )
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{
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int ebx, count;
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unsigned long *rk;
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unsigned long *iw;
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unsigned long *ctrl;
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unsigned char buf[256];
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if( ( (long) input & 15 ) != 0 ||
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( (long) output & 15 ) != 0 )
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return( 1 );
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rk = ctx->rk;
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iw = PADLOCK_ALIGN16( buf );
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memcpy( iw, iv, 16 );
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ctrl = iw + 4;
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*ctrl = 0x80 | ctx->nr | ( ( ctx->nr + (mode^1) - 10 ) << 9 );
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count = (length + 15) >> 4;
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asm( "pushfl; popfl \n" \
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"movl %%ebx, %0 \n" \
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"movl %2, %%ecx \n" \
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"movl %3, %%edx \n" \
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"movl %4, %%ebx \n" \
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"movl %5, %%esi \n" \
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"movl %6, %%edi \n" \
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"movl %7, %%eax \n" \
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".byte 0xf3,0x0f,0xa7,0xd0\n" \
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"movl %1, %%ebx \n"
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: "=m" (ebx)
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: "m" (ebx), "m" (count), "m" (ctrl),
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"m" (rk), "m" (input), "m" (output), "m" (iw)
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: "eax", "ecx", "edx", "esi", "edi" );
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memcpy( iv, iw, 16 );
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return( 0 );
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}
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#endif
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#endif
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