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Diffstat (limited to 'polarssl/src/library/padlock.c')
| -rw-r--r-- | polarssl/src/library/padlock.c | 162 |
1 files changed, 162 insertions, 0 deletions
diff --git a/polarssl/src/library/padlock.c b/polarssl/src/library/padlock.c new file mode 100644 index 0000000..2e2e477 --- /dev/null +++ b/polarssl/src/library/padlock.c @@ -0,0 +1,162 @@ +/* + * VIA PadLock support functions + * + * Copyright (C) 2006-2010, 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. + */ +/* + * This implementation is based on the VIA PadLock Programming Guide: + * + * http://www.via.com.tw/en/downloads/whitepapers/initiatives/padlock/ + * programming_guide.pdf + */ + +#include "polarssl/config.h" + +#if defined(POLARSSL_PADLOCK_C) + +#include "polarssl/padlock.h" + +#if defined(POLARSSL_HAVE_X86) + +/* + * PadLock detection routine + */ +int padlock_supports( int feature ) +{ + static int flags = -1; + int ebx, edx; + + if( flags == -1 ) + { + asm( "movl %%ebx, %0 \n" \ + "movl $0xC0000000, %%eax \n" \ + "cpuid \n" \ + "cmpl $0xC0000001, %%eax \n" \ + "movl $0, %%edx \n" \ + "jb unsupported \n" \ + "movl $0xC0000001, %%eax \n" \ + "cpuid \n" \ + "unsupported: \n" \ + "movl %%edx, %1 \n" \ + "movl %2, %%ebx \n" + : "=m" (ebx), "=m" (edx) + : "m" (ebx) + : "eax", "ecx", "edx" ); + + flags = edx; + } + + return( flags & feature ); +} + +/* + * PadLock AES-ECB block en(de)cryption + */ +int padlock_xcryptecb( aes_context *ctx, + int mode, + const unsigned char input[16], + unsigned char output[16] ) +{ + int ebx; + unsigned long *rk; + unsigned long *blk; + unsigned long *ctrl; + unsigned char buf[256]; + + rk = ctx->rk; + blk = PADLOCK_ALIGN16( buf ); + memcpy( blk, input, 16 ); + + ctrl = blk + 4; + *ctrl = 0x80 | ctx->nr | ( ( ctx->nr + ( mode^1 ) - 10 ) << 9 ); + + asm( "pushfl; popfl \n" \ + "movl %%ebx, %0 \n" \ + "movl $1, %%ecx \n" \ + "movl %2, %%edx \n" \ + "movl %3, %%ebx \n" \ + "movl %4, %%esi \n" \ + "movl %4, %%edi \n" \ + ".byte 0xf3,0x0f,0xa7,0xc8\n" \ + "movl %1, %%ebx \n" + : "=m" (ebx) + : "m" (ebx), "m" (ctrl), "m" (rk), "m" (blk) + : "ecx", "edx", "esi", "edi" ); + + memcpy( output, blk, 16 ); + + return( 0 ); +} + +/* + * PadLock AES-CBC buffer en(de)cryption + */ +int padlock_xcryptcbc( aes_context *ctx, + int mode, + size_t length, + unsigned char iv[16], + const unsigned char *input, + unsigned char *output ) +{ + int ebx; + size_t count; + unsigned long *rk; + unsigned long *iw; + unsigned long *ctrl; + unsigned char buf[256]; + + if( ( (long) input & 15 ) != 0 || + ( (long) output & 15 ) != 0 ) + return( POLARSSL_ERR_PADLOCK_DATA_MISALIGNED ); + + rk = ctx->rk; + iw = PADLOCK_ALIGN16( buf ); + memcpy( iw, iv, 16 ); + + ctrl = iw + 4; + *ctrl = 0x80 | ctx->nr | ( ( ctx->nr + (mode^1) - 10 ) << 9 ); + + count = (length + 15) >> 4; + + asm( "pushfl; popfl \n" \ + "movl %%ebx, %0 \n" \ + "movl %2, %%ecx \n" \ + "movl %3, %%edx \n" \ + "movl %4, %%ebx \n" \ + "movl %5, %%esi \n" \ + "movl %6, %%edi \n" \ + "movl %7, %%eax \n" \ + ".byte 0xf3,0x0f,0xa7,0xd0\n" \ + "movl %1, %%ebx \n" + : "=m" (ebx) + : "m" (ebx), "m" (count), "m" (ctrl), + "m" (rk), "m" (input), "m" (output), "m" (iw) + : "eax", "ecx", "edx", "esi", "edi" ); + + memcpy( iv, iw, 16 ); + + return( 0 ); +} + +#endif + +#endif |