155 lines
4.1 KiB
C
155 lines
4.1 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 OR GPL-2.0-or-later
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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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#if defined(MBEDTLS_VIA_PADLOCK_HAVE_CODE)
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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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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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}
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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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}
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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_VIA_PADLOCK_HAVE_CODE */
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#endif /* MBEDTLS_PADLOCK_C */
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