kopia lustrzana https://github.com/espressif/esp-idf
153 wiersze
3.4 KiB
C
153 wiersze
3.4 KiB
C
/*
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* SPDX-FileCopyrightText: 2020-2023 Espressif Systems (Shanghai) CO LTD
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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// The HAL layer for SHA
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#include "hal/sha_hal.h"
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#include "hal/sha_types.h"
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#include "hal/sha_ll.h"
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#include "soc/soc_caps.h"
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#include <stdlib.h>
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#include <stdio.h>
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#define SHA1_STATE_LEN_WORDS (160 / 32)
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#define SHA256_STATE_LEN_WORDS (256 / 32)
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#define SHA512_STATE_LEN_WORDS (512 / 32)
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#if CONFIG_IDF_TARGET_ESP32
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/* Return state size (in words) for a given SHA type */
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inline static size_t state_length(esp_sha_type type)
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{
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switch (type) {
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case SHA1:
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return SHA1_STATE_LEN_WORDS;
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case SHA2_256:
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return SHA256_STATE_LEN_WORDS;
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case SHA2_384:
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case SHA2_512:
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return SHA512_STATE_LEN_WORDS;
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default:
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return 0;
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}
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}
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#else
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/* Return state size (in words) for a given SHA type */
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inline static size_t state_length(esp_sha_type type)
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{
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switch (type) {
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case SHA1:
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return SHA1_STATE_LEN_WORDS;
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case SHA2_224:
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case SHA2_256:
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return SHA256_STATE_LEN_WORDS;
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#if SOC_SHA_SUPPORT_SHA384
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case SHA2_384:
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return SHA512_STATE_LEN_WORDS;
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#endif
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#if SOC_SHA_SUPPORT_SHA512
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case SHA2_512:
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return SHA512_STATE_LEN_WORDS;
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#endif
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#if SOC_SHA_SUPPORT_SHA512_T
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case SHA2_512224:
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case SHA2_512256:
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case SHA2_512T:
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return SHA512_STATE_LEN_WORDS;
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#endif
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default:
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return 0;
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}
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}
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#endif
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/* Hash a single block */
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void sha_hal_hash_block(esp_sha_type sha_type, const void *data_block, size_t block_word_len, bool first_block)
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{
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sha_hal_wait_idle();
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sha_ll_fill_text_block(data_block, block_word_len);
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/* Start hashing */
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if (first_block) {
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sha_ll_start_block(sha_type);
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} else {
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sha_ll_continue_block(sha_type);
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}
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}
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#if SOC_SHA_SUPPORT_DMA
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/* Hashes a number of message blocks using DMA */
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void sha_hal_hash_dma(esp_sha_type sha_type, size_t num_blocks, bool first_block)
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{
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sha_hal_wait_idle();
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sha_ll_set_block_num(num_blocks);
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/* Start hashing */
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if (first_block) {
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sha_ll_start_dma(sha_type);
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} else {
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sha_ll_continue_dma(sha_type);
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}
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}
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#endif //SOC_SHA_SUPPORT_DMA
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void sha_hal_wait_idle()
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{
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while (sha_ll_busy()) {
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}
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}
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/* Reads the current message digest from the SHA engine */
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void sha_hal_read_digest(esp_sha_type sha_type, void *digest_state)
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{
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uint32_t *digest_state_words = (uint32_t *)digest_state;
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sha_ll_load(sha_type);
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uint32_t word_len = state_length(sha_type);
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sha_hal_wait_idle();
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sha_ll_read_digest(sha_type, digest_state, word_len);
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/* Fault injection check: verify SHA engine actually ran,
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state is not all zeroes.
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*/
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for (size_t i = 0; i < word_len; i++) {
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if (digest_state_words[i] != 0) {
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return;
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}
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}
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abort(); // SHA peripheral returned all zero state, probably due to fault injection
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}
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#if SOC_SHA_SUPPORT_RESUME
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/* Writes the message digest to the SHA engine */
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void sha_hal_write_digest(esp_sha_type sha_type, void *digest_state)
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{
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sha_ll_write_digest(sha_type, digest_state, state_length(sha_type));
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}
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#endif //SOC_SHA_SUPPORT_RESUME
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#if SOC_SHA_SUPPORT_SHA512_T
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/* Calculates and sets the initial digiest for SHA512_t */
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void sha_hal_sha512_init_hash(uint32_t t_string, uint8_t t_len)
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{
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sha_ll_t_string_set(t_string);
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sha_ll_t_len_set(t_len);
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sha_ll_start_block(SHA2_512T);
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sha_hal_wait_idle();
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}
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#endif //SOC_SHA_SUPPORT_SHA512_T
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