mirror of https://github.com/ARMmbed/mbed-os.git
150 lines
4.0 KiB
C
150 lines
4.0 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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/* 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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memset( ctx, 0, sizeof( mbedtls_sha1_context ) );
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/* Enable HASH clock */
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__HAL_RCC_HASH_CLK_ENABLE();
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ctx->flag=0;
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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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/*
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* SHA-1 context setup
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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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ctx->flag=0;
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}
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void mbedtls_sha1_process( mbedtls_sha1_context *ctx, const unsigned char data[64] )
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{
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HAL_HASH_SHA1_Accumulate(&ctx->hhash_sha1, (uint8_t *) data, 64);
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}
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/*
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* SHA-1 process buffer
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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 *intermediate_buf=NULL;
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unsigned char modulus=0;
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unsigned char buf_len=0;
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// Accumulate cannot be called for a size <4 unless it is the last call
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modulus = ilen % 4;
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if (ilen <4)
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{
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ctx->sbuf=malloc(ilen);
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memcpy(ctx->sbuf, input, ilen);
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ctx->flag = 1;
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ctx->sbuf_len=ilen;
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}
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else
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{
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if (modulus !=0)
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{
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buf_len = ilen - modulus;
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HAL_HASH_SHA1_Accumulate(&ctx->hhash_sha1, (uint8_t *)input, buf_len);
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ctx->sbuf_len=modulus;
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ctx->sbuf=malloc(ctx->sbuf_len);
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memcpy(ctx->sbuf, input+buf_len, modulus);
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ctx->flag = 1;
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}
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else
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{
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if (ctx->flag==0)
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HAL_HASH_SHA1_Accumulate(&ctx->hhash_sha1, (uint8_t *)input, ilen);
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else
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{
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intermediate_buf=malloc(ilen+ctx->sbuf_len);
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memcpy(intermediate_buf, ctx->sbuf, ctx->sbuf_len);
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memcpy(intermediate_buf+ctx->sbuf_len, input, ilen);
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HAL_HASH_SHA1_Accumulate(&ctx->hhash_sha1, intermediate_buf, ilen+ctx->sbuf_len);
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ctx->flag=0;
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}
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}
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}
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}
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/*
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* SHA-1 final digest
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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->flag == 1) {
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HAL_HASH_SHA1_Accumulate(&ctx->hhash_sha1, ctx->sbuf, ctx->sbuf_len);
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ctx->flag=0;
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}
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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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