170 lines
4.7 KiB
C
170 lines
4.7 KiB
C
/*
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* VIA PadLock support functions
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*
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* Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* This file is part of mbed TLS (https://tls.mbed.org)
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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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#if !defined(MBEDTLS_CONFIG_FILE)
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#include "mbedtls/config.h"
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#else
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#include MBEDTLS_CONFIG_FILE
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#endif
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#if defined(MBEDTLS_PADLOCK_C)
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#include "mbedtls/padlock.h"
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#include <string.h>
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#ifndef asm
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#define asm __asm
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#endif
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#if defined(MBEDTLS_HAVE_X86)
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/*
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* PadLock detection routine
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*/
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int mbedtls_padlock_has_support( int feature )
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{
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static int flags = -1;
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int ebx = 0, edx = 0;
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if( flags == -1 )
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{
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asm( "movl %%ebx, %0 \n\t"
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"movl $0xC0000000, %%eax \n\t"
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"cpuid \n\t"
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"cmpl $0xC0000001, %%eax \n\t"
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"movl $0, %%edx \n\t"
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"jb unsupported \n\t"
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"movl $0xC0000001, %%eax \n\t"
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"cpuid \n\t"
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"unsupported: \n\t"
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"movl %%edx, %1 \n\t"
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"movl %2, %%ebx \n\t"
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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 mbedtls_padlock_xcryptecb( mbedtls_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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int ebx = 0;
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uint32_t *rk;
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uint32_t *blk;
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uint32_t *ctrl;
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unsigned char buf[256];
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rk = ctx->rk;
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blk = MBEDTLS_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 \n\t"
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"popfl \n\t"
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"movl %%ebx, %0 \n\t"
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"movl $1, %%ecx \n\t"
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"movl %2, %%edx \n\t"
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"movl %3, %%ebx \n\t"
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"movl %4, %%esi \n\t"
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"movl %4, %%edi \n\t"
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".byte 0xf3,0x0f,0xa7,0xc8 \n\t"
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"movl %1, %%ebx \n\t"
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: "=m" (ebx)
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: "m" (ebx), "m" (ctrl), "m" (rk), "m" (blk)
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: "memory", "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 mbedtls_padlock_xcryptcbc( mbedtls_aes_context *ctx,
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int mode,
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size_t length,
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unsigned char iv[16],
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const unsigned char *input,
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unsigned char *output )
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{
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int ebx = 0;
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size_t count;
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uint32_t *rk;
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uint32_t *iw;
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uint32_t *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( MBEDTLS_ERR_PADLOCK_DATA_MISALIGNED );
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rk = ctx->rk;
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iw = MBEDTLS_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 \n\t"
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"popfl \n\t"
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"movl %%ebx, %0 \n\t"
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"movl %2, %%ecx \n\t"
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"movl %3, %%edx \n\t"
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"movl %4, %%ebx \n\t"
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"movl %5, %%esi \n\t"
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"movl %6, %%edi \n\t"
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"movl %7, %%eax \n\t"
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".byte 0xf3,0x0f,0xa7,0xd0 \n\t"
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"movl %1, %%ebx \n\t"
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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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: "memory", "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 /* MBEDTLS_HAVE_X86 */
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#endif /* MBEDTLS_PADLOCK_C */
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