e3d8f31ba1
The following code: #ifndef asm #define asm __asm #endif causes Uncrustify to stop correcting the rest of the file. This may be due to parsing the "asm" keyword in the definition. Work around this by wrapping the idiom in an *INDENT-OFF* comment wherever it appears. Signed-off-by: David Horstmann <david.horstmann@arm.com>
172 lines
4.7 KiB
C
172 lines
4.7 KiB
C
/*
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* VIA PadLock support functions
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*
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* Copyright The Mbed TLS Contributors
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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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/*
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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 "common.h"
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#if defined(MBEDTLS_PADLOCK_C)
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#include "padlock.h"
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#include <string.h>
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/* *INDENT-OFF* */
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#ifndef asm
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#define asm __asm
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#endif
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/* *INDENT-ON* */
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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 1f \n\t"
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"movl $0xC0000001, %%eax \n\t"
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"cpuid \n\t"
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"1: \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->buf + ctx->rk_offset;
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if( ( (long) rk & 15 ) != 0 )
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return( MBEDTLS_ERR_PADLOCK_DATA_MISALIGNED );
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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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rk = ctx->buf + ctx->rk_offset;
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if( ( (long) input & 15 ) != 0 ||
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( (long) output & 15 ) != 0 ||
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( (long) rk & 15 ) != 0 )
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return( MBEDTLS_ERR_PADLOCK_DATA_MISALIGNED );
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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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