mirror of https://github.com/ARMmbed/mbed-os.git
125 lines
3.9 KiB
C
125 lines
3.9 KiB
C
/*
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* sha1_alt.c for SHA1 HASH
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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/sha1.h"
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#if defined(MBEDTLS_SHA1_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 = (unsigned char*)v; while( n-- ) *p++ = 0;
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}
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void mbedtls_sha1_init( mbedtls_sha1_context *ctx )
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{
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mbedtls_zeroize( ctx, sizeof( mbedtls_sha1_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_sha1_free( mbedtls_sha1_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_sha1_context ) );
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}
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void mbedtls_sha1_clone( mbedtls_sha1_context *dst,
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const mbedtls_sha1_context *src )
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{
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*dst = *src;
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}
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void mbedtls_sha1_starts( mbedtls_sha1_context *ctx )
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{
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/* Deinitializes the HASH peripheral */
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if (HAL_HASH_DeInit(&ctx->hhash_sha1) == HAL_ERROR) {
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// error found to be returned
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return;
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}
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/* HASH Configuration */
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ctx->hhash_sha1.Init.DataType = HASH_DATATYPE_8B;
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if (HAL_HASH_Init(&ctx->hhash_sha1) == HAL_ERROR) {
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// error found to be returned
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return;
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}
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}
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void mbedtls_sha1_process( mbedtls_sha1_context *ctx, const unsigned char data[MBEDTLS_SHA1_BLOCK_SIZE] )
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{
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HAL_HASH_SHA1_Accumulate(&ctx->hhash_sha1, (uint8_t *) data, MBEDTLS_SHA1_BLOCK_SIZE);
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}
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void mbedtls_sha1_update( mbedtls_sha1_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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if (currentlen == 0){ // change HW status is size if 0
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HAL_HASH_SHA1_Accumulate(&ctx->hhash_sha1, (uint8_t *) input, ilen);
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}
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while ((currentlen+ctx->sbuf_len) >=MBEDTLS_SHA1_BLOCK_SIZE) {
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if (ctx->sbuf_len ==0) { /* straight forward */
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mbedtls_sha1_process(ctx, input+(i*MBEDTLS_SHA1_BLOCK_SIZE));
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} else {
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unsigned char tmp = ctx->sbuf_len;
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memcpy(ctx->sbuf+tmp, input+(i*MBEDTLS_SHA1_BLOCK_SIZE),MBEDTLS_SHA1_BLOCK_SIZE-tmp);
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mbedtls_sha1_process(ctx, ctx->sbuf);
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if ((currentlen-(MBEDTLS_SHA1_BLOCK_SIZE-tmp)) < tmp) {
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ctx->sbuf_len = currentlen-(MBEDTLS_SHA1_BLOCK_SIZE-tmp);
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}
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memcpy(ctx->sbuf,input+(i+1)*MBEDTLS_SHA1_BLOCK_SIZE-tmp, ctx->sbuf_len);
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}
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currentlen -= MBEDTLS_SHA1_BLOCK_SIZE;
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i++;
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}
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if (currentlen >0) {
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/* Store the remaining <64 values */
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memcpy(ctx->sbuf+ctx->sbuf_len, input+(i*MBEDTLS_SHA1_BLOCK_SIZE), currentlen);
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ctx->sbuf_len += currentlen;
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}
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}
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void mbedtls_sha1_finish( mbedtls_sha1_context *ctx, unsigned char output[20] )
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{
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if (ctx->sbuf_len > 0) {
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HAL_HASH_SHA1_Accumulate(&ctx->hhash_sha1, ctx->sbuf, ctx->sbuf_len);
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}
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mbedtls_zeroize(ctx->sbuf, MBEDTLS_SHA1_BLOCK_SIZE);
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ctx->sbuf_len = 0;
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__HAL_HASH_START_DIGEST();
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if (HAL_HASH_SHA1_Finish(&ctx->hhash_sha1, 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_SHA1_ALT*/
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