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https://github.com/openmv/openmv.git
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108 lines
2.8 KiB
C
108 lines
2.8 KiB
C
/*
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* SPDX-License-Identifier: MIT
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*
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* Copyright (C) 2013-2024 OpenMV, LLC.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*
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* Hash functions.
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*/
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#if (OMV_ENABLE_HASH == 1)
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#include STM32_HAL_H
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#include <stdbool.h>
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#include <stdio.h>
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#include "hash.h"
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#include "fb_alloc.h"
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#include "file_utils.h"
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#define BLOCK_SIZE (512)
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static HASH_HandleTypeDef hhash;
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int hash_start() {
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if (HAL_HASH_DeInit(&hhash) != HAL_OK) {
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return -1;
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}
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hhash.Init.DataType = HASH_DATATYPE_8B;
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HAL_HASH_Init(&hhash);
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}
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int hash_update(uint8_t *buffer, uint32_t size) {
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if ((size % 4) != 0) {
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return -1;
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}
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if (HAL_HASH_MD5_Accumulate(&hhash, buffer, size) != HAL_OK) {
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return -1;
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}
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return 0;
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}
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int hash_digest(uint8_t *buffer, uint32_t size, uint8_t *digest) {
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if (HAL_HASH_MD5_Start(&hhash, buffer, size, digest, 0xFF) != HAL_OK) {
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return -1;
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}
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return 0;
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}
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int hash_from_file(const char *path, uint8_t *digest) {
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file_t fp;
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uint32_t offset = 0;
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size_t bytes = 0;
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int ret = -1;
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uint8_t *buf = fb_alloc(BLOCK_SIZE, FB_ALLOC_NO_HINT);
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file_open(&fp, path, false, FA_READ | FA_OPEN_EXISTING);
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// File size
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uint32_t size = file_size(&fp);
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while (size) {
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// Read a block.
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bytes = MIN(size, BLOCK_SIZE);
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file_read(&fp, buf, bytes);
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// Accumulate buffer.
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if ((size - bytes) > 0) {
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ret = hash_update(buf, bytes);
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} else {
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// last block, get digest.
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ret = hash_digest(buf, bytes, digest);
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}
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if (ret != 0) {
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printf("hash_from_file: hash_update/digest failed!\n");
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goto error;
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}
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size -= bytes;
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offset += bytes;
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}
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ret = 0;
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error:
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fb_free();
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file_close(&fp);
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return ret;
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}
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#endif //OMV_ENABLE_HASH == 1
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