mirror of
https://github.com/espressif/esp-idf.git
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261 lines
7.2 KiB
C
261 lines
7.2 KiB
C
/*
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* SPDX-FileCopyrightText: 2025 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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#include <assert.h>
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#include <stdbool.h>
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#include <string.h>
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#include <sys/param.h>
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#include "bootloader_sha.h"
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#include "soc/soc_caps.h"
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#include "rom/sha.h"
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#include "sdkconfig.h"
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#if NON_OS_BUILD || CONFIG_APP_BUILD_TYPE_RAM
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#if !CONFIG_IDF_TARGET_ESP32
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static SHA_CTX ctx;
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bootloader_sha256_handle_t bootloader_sha256_start()
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{
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// Enable SHA hardware
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ets_sha_enable();
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ets_sha_init(&ctx, SHA2_256);
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return &ctx; // Meaningless non-NULL value
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}
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void bootloader_sha256_data(bootloader_sha256_handle_t handle, const void *data, size_t data_len)
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{
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assert(handle != NULL);
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ets_sha_update(&ctx, data, data_len, false);
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}
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void bootloader_sha256_finish(bootloader_sha256_handle_t handle, uint8_t *digest)
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{
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assert(handle != NULL);
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if (digest == NULL) {
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bzero(&ctx, sizeof(ctx));
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return;
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}
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ets_sha_finish(&ctx, digest);
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}
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#if SOC_SHA_SUPPORT_SHA512
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bootloader_sha_handle_t bootloader_sha512_start(bool is384)
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{
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// Enable SHA hardware
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ets_sha_enable();
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ets_sha_init(&ctx, is384 ? SHA2_384 : SHA2_512);
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return &ctx; // Meaningless non-NULL value
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}
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void bootloader_sha512_data(bootloader_sha_handle_t handle, const void *data, size_t data_len)
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{
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assert(handle != NULL);
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ets_sha_update(&ctx, data, data_len, false);
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}
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void bootloader_sha512_finish(bootloader_sha_handle_t handle, uint8_t *digest)
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{
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assert(handle != NULL);
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if (digest == NULL) {
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bzero(&ctx, sizeof(ctx));
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return;
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}
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ets_sha_finish(&ctx, digest);
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}
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#endif /* SOC_SHA_SUPPORT_SHA512 */
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#else /* !CONFIG_IDF_TARGET_ESP32 */
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#include "soc/dport_reg.h"
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#include "soc/hwcrypto_periph.h"
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static uint32_t words_hashed;
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// Words per SHA256 block
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static const size_t BLOCK_WORDS = (64 / sizeof(uint32_t));
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// Words in final SHA256 digest
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static const size_t DIGEST_WORDS = (32 / sizeof(uint32_t));
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bootloader_sha256_handle_t bootloader_sha256_start(void)
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{
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// Enable SHA hardware
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ets_sha_enable();
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words_hashed = 0;
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return (bootloader_sha256_handle_t)&words_hashed; // Meaningless non-NULL value
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}
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void bootloader_sha256_data(bootloader_sha256_handle_t handle, const void *data, size_t data_len)
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{
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assert(handle != NULL);
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assert(data_len % 4 == 0);
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const uint32_t *w = (const uint32_t *)data;
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size_t word_len = data_len / 4;
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uint32_t *sha_text_reg = (uint32_t *)(SHA_TEXT_BASE);
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while (word_len > 0) {
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size_t block_count = words_hashed % BLOCK_WORDS;
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size_t copy_words = (BLOCK_WORDS - block_count);
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copy_words = MIN(word_len, copy_words);
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// Wait for SHA engine idle
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while (_DPORT_REG_READ(SHA_256_BUSY_REG) != 0) { }
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// Copy to memory block
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for (size_t i = 0; i < copy_words; i++) {
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sha_text_reg[block_count + i] = __builtin_bswap32(w[i]);
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}
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asm volatile ("memw");
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// Update counters
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words_hashed += copy_words;
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block_count += copy_words;
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word_len -= copy_words;
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w += copy_words;
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// If we loaded a full block, run the SHA engine
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if (block_count == BLOCK_WORDS) {
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if (words_hashed == BLOCK_WORDS) {
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_DPORT_REG_WRITE(SHA_256_START_REG, 1);
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} else {
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_DPORT_REG_WRITE(SHA_256_CONTINUE_REG, 1);
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}
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block_count = 0;
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}
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}
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}
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void bootloader_sha256_finish(bootloader_sha256_handle_t handle, uint8_t *digest)
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{
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assert(handle != NULL);
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if (digest == NULL) {
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return; // We'd free resources here, but there are none to free
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}
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uint32_t data_words = words_hashed;
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// Pad to a 55 byte long block loaded in the engine
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// (leaving 1 byte 0x80 plus variable padding plus 8 bytes of length,
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// to fill a 64 byte block.)
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int block_bytes = (words_hashed % BLOCK_WORDS) * 4;
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int pad_bytes = 55 - block_bytes;
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if (pad_bytes < 0) {
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pad_bytes += 64;
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}
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static const uint8_t padding[64] = { 0x80, 0, };
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pad_bytes += 5; // 1 byte for 0x80 plus first 4 bytes of the 64-bit length
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assert(pad_bytes % 4 == 0); // should be, as (block_bytes % 4 == 0)
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bootloader_sha256_data(handle, padding, pad_bytes);
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assert(words_hashed % BLOCK_WORDS == 60 / 4); // 32-bits left in block
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// Calculate 32-bit length for final 32 bits of data
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uint32_t bit_count = __builtin_bswap32( data_words * 32 );
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bootloader_sha256_data(handle, &bit_count, sizeof(bit_count));
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assert(words_hashed % BLOCK_WORDS == 0);
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while (_DPORT_REG_READ(SHA_256_BUSY_REG) == 1) { }
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_DPORT_REG_WRITE(SHA_256_LOAD_REG, 1);
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while (_DPORT_REG_READ(SHA_256_BUSY_REG) == 1) { }
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uint32_t *digest_words = (uint32_t *)digest;
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uint32_t *sha_text_reg = (uint32_t *)(SHA_TEXT_BASE);
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for (size_t i = 0; i < DIGEST_WORDS; i++) {
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digest_words[i] = __builtin_bswap32(sha_text_reg[i]);
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}
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asm volatile ("memw");
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}
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#endif /* CONFIG_IDF_TARGET_ESP32 */
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#else /* NON_OS_BUILD || CONFIG_APP_BUILD_TYPE_RAM */
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#include "bootloader_flash_priv.h"
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#include <mbedtls/sha256.h>
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#include <mbedtls/sha512.h>
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bootloader_sha256_handle_t bootloader_sha256_start(void)
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{
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mbedtls_sha256_context *ctx = (mbedtls_sha256_context *)malloc(sizeof(mbedtls_sha256_context));
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if (!ctx) {
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return NULL;
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}
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mbedtls_sha256_init(ctx);
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int ret = mbedtls_sha256_starts(ctx, false);
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if (ret != 0) {
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return NULL;
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}
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return ctx;
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}
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void bootloader_sha256_data(bootloader_sha256_handle_t handle, const void *data, size_t data_len)
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{
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assert(handle != NULL);
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mbedtls_sha256_context *ctx = (mbedtls_sha256_context *)handle;
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int ret = mbedtls_sha256_update(ctx, data, data_len);
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assert(ret == 0);
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(void)ret;
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}
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void bootloader_sha256_finish(bootloader_sha256_handle_t handle, uint8_t *digest)
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{
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assert(handle != NULL);
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mbedtls_sha256_context *ctx = (mbedtls_sha256_context *)handle;
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if (digest != NULL) {
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int ret = mbedtls_sha256_finish(ctx, digest);
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assert(ret == 0);
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(void)ret;
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}
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mbedtls_sha256_free(ctx);
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free(handle);
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handle = NULL;
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}
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#if SOC_SHA_SUPPORT_SHA512
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bootloader_sha_handle_t bootloader_sha512_start(bool is384)
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{
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mbedtls_sha512_context *ctx = (mbedtls_sha512_context *)malloc(sizeof(mbedtls_sha512_context));
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if (!ctx) {
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return NULL;
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}
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mbedtls_sha512_init(ctx);
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int ret = mbedtls_sha512_starts(ctx, is384);
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if (ret != 0) {
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return NULL;
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}
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return ctx;
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}
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void bootloader_sha512_data(bootloader_sha_handle_t handle, const void *data, size_t data_len)
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{
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assert(handle != NULL);
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mbedtls_sha512_context *ctx = (mbedtls_sha512_context *)handle;
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int ret = mbedtls_sha512_update(ctx, data, data_len);
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assert(ret == 0);
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(void)ret;
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}
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void bootloader_sha512_finish(bootloader_sha_handle_t handle, uint8_t *digest)
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{
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assert(handle != NULL);
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mbedtls_sha512_context *ctx = (mbedtls_sha512_context *)handle;
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if (digest != NULL) {
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int ret = mbedtls_sha512_finish(ctx, digest);
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assert(ret == 0);
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(void)ret;
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}
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mbedtls_sha512_free(ctx);
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free(handle);
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handle = NULL;
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}
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#endif /* SOC_SHA_SUPPORT_SHA512 */
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#endif /* !(NON_OS_BUILD || CONFIG_APP_BUILD_TYPE_RAM) */
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