mirror of https://github.com/ARMmbed/mbed-os.git
128 lines
3.4 KiB
C
128 lines
3.4 KiB
C
/*
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* MD5 hw acceleration
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*******************************************************************************
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* Copyright (c) 2017, STMicroelectronics
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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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#include "mbedtls/md5.h"
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#if defined(MBEDTLS_MD5_ALT)
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#include "mbedtls/platform.h"
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/* Implementation that should never be optimized out by the compiler */
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static void mbedtls_zeroize( void *v, size_t n ) {
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volatile unsigned char *p = v; while( n-- ) *p++ = 0;
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}
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void mbedtls_md5_init( mbedtls_md5_context *ctx )
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{
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mbedtls_zeroize( ctx, sizeof( mbedtls_md5_context ) );
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/* Enable HASH clock */
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__HAL_RCC_HASH_CLK_ENABLE();
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}
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void mbedtls_md5_free( mbedtls_md5_context *ctx )
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{
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if( ctx == NULL )
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return;
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/* Force the HASH Periheral Clock Reset */
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__HAL_RCC_HASH_FORCE_RESET();
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/* Release the HASH Periheral Clock Reset */
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__HAL_RCC_HASH_RELEASE_RESET();
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mbedtls_zeroize( ctx, sizeof( mbedtls_md5_context ) );
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}
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void mbedtls_md5_clone( mbedtls_md5_context *dst,
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const mbedtls_md5_context *src )
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{
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*dst = *src;
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}
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/*
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* MD5 context setup
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*/
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void mbedtls_md5_starts( mbedtls_md5_context *ctx )
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{
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/* HASH IP initialization */
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HAL_HASH_DeInit(&ctx->hhash_md5);
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/* HASH Configuration */
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ctx->hhash_md5.Init.DataType = HASH_DATATYPE_8B;
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if (HAL_HASH_Init(&ctx->hhash_md5) == HAL_ERROR) {
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// return error code
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return;
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}
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}
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void mbedtls_md5_process( mbedtls_md5_context *ctx, const unsigned char data[64] )
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{
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HAL_HASH_MD5_Accumulate(&ctx->hhash_md5, (uint8_t *)data, 64);
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}
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/*
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* MD5 process buffer
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*/
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void mbedtls_md5_update( mbedtls_md5_context *ctx, const unsigned char *input, size_t ilen )
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{
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unsigned char i=0;
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int currentlen = ilen;
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/* store mechanism to handle 64 bytes per 64 bytes */
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while ((currentlen+ctx->sbuf_len) >=64) {
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if (ctx->sbuf_len ==0) { /* straight forward */
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mbedtls_md5_process(ctx, input+(i*64));
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} else {
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memcpy(ctx->sbuf+ctx->sbuf_len, input+(i*64),64-ctx->sbuf_len);
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mbedtls_md5_process(ctx, ctx->sbuf);
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memcpy(ctx->sbuf,input+(i+1)*64-ctx->sbuf_len, ctx->sbuf_len);
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// ctx->sbuf_len remains the same
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}
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currentlen -= 64;
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i++;
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}
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if (currentlen <0) {
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currentlen +=64;
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}
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/* Store the remaining <64 values */
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memcpy(ctx->sbuf+ctx->sbuf_len, input+(i*64), currentlen);
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ctx->sbuf_len += currentlen;
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}
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/*
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* MD5 final digest
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*/
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void mbedtls_md5_finish( mbedtls_md5_context *ctx, unsigned char output[16] )
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{
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if (ctx->sbuf_len > 0) {
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HAL_HASH_MD5_Accumulate(&ctx->hhash_md5, ctx->sbuf, ctx->sbuf_len);
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}
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mbedtls_zeroize( ctx->sbuf, 64);
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ctx->sbuf_len = 0;
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__HAL_HASH_START_DIGEST();
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if (HAL_HASH_MD5_Finish(&ctx->hhash_md5, output, 10)) {
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// error code to be returned
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}
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}
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#endif /* MBEDTLS_MD5_ALT */
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