mirror of
https://github.com/espressif/esp-idf.git
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122 lines
3.3 KiB
C
122 lines
3.3 KiB
C
/*
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* SPDX-FileCopyrightText: 2023-2024 Espressif Systems (Shanghai) CO LTD
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*
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* SPDX-License-Identifier: CC0-1.0
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "esp_private/esp_crypto_lock_internal.h"
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#include "hal/aes_types.h"
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#include "hal/aes_hal.h"
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#include "hal/aes_ll.h"
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#if SOC_AES_SUPPORTED
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#include "aes_block.h"
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void aes_crypt_cbc_block(int mode,
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uint8_t key_bytes,
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const uint8_t key[32],
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size_t length,
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unsigned char iv[16],
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const unsigned char *input,
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unsigned char *output)
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{
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uint32_t *output_words = (uint32_t *)output;
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const uint32_t *input_words = (const uint32_t *)input;
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uint32_t *iv_words = (uint32_t *)iv;
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unsigned char temp[16];
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AES_RCC_ATOMIC() {
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aes_ll_enable_bus_clock(true);
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aes_ll_reset_register();
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}
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/* Sets the key used for AES encryption/decryption */
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aes_hal_setkey(key, key_bytes, mode);
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if (mode == ESP_AES_DECRYPT) {
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while ( length > 0 ) {
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memcpy(temp, input_words, 16);
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aes_hal_transform_block(input_words, output_words);
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output_words[0] = output_words[0] ^ iv_words[0];
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output_words[1] = output_words[1] ^ iv_words[1];
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output_words[2] = output_words[2] ^ iv_words[2];
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output_words[3] = output_words[3] ^ iv_words[3];
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memcpy( iv_words, temp, 16 );
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input_words += 4;
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output_words += 4;
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length -= 16;
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}
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} else { // ESP_AES_ENCRYPT
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while ( length > 0 ) {
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output_words[0] = input_words[0] ^ iv_words[0];
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output_words[1] = input_words[1] ^ iv_words[1];
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output_words[2] = input_words[2] ^ iv_words[2];
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output_words[3] = input_words[3] ^ iv_words[3];
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aes_hal_transform_block(output_words, output_words);
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memcpy( iv_words, output_words, 16 );
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input_words += 4;
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output_words += 4;
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length -= 16;
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}
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}
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AES_RCC_ATOMIC() {
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aes_ll_enable_bus_clock(false);
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}
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}
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void aes_crypt_ctr_block(uint8_t key_bytes,
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const uint8_t key[32],
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size_t length,
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size_t *nc_off,
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unsigned char nonce_counter[16],
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unsigned char stream_block[16],
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const unsigned char *input,
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unsigned char *output )
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{
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int c, i;
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size_t n = *nc_off;
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AES_RCC_ATOMIC() {
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aes_ll_enable_bus_clock(true);
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aes_ll_reset_register();
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}
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/* Sets the key used for AES encryption/decryption */
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aes_hal_setkey(key, key_bytes, ESP_AES_ENCRYPT);
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while (length--) {
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if ( n == 0 ) {
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aes_hal_transform_block(nonce_counter, stream_block);
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for ( i = 16; i > 0; i-- ) {
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if ( ++nonce_counter[i - 1] != 0 ) {
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break;
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}
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}
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}
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c = *input++;
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*output++ = (unsigned char)( c ^ stream_block[n] );
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n = ( n + 1 ) & 0x0F;
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}
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*nc_off = n;
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AES_RCC_ATOMIC() {
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aes_ll_enable_bus_clock(false);
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}
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}
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#endif
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