// Copyright 2020 Espressif Systems (Shanghai) PTE LTD // // Licensed under the Apache License, Version 2.0 (the "License"); // you may not use this file except in compliance with the License. // You may obtain a copy of the License at // // http://www.apache.org/licenses/LICENSE-2.0 // // Unless required by applicable law or agreed to in writing, software // distributed under the License is distributed on an "AS IS" BASIS, // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. // See the License for the specific language governing permissions and // limitations under the License. // The HAL layer for AES #include "hal/aes_hal.h" #include "hal/aes_ll.h" #include #include #include "soc/soc_caps.h" #if SOC_AES_CRYPTO_DMA #include "soc/crypto_dma_reg.h" #include "hal/crypto_dma_ll.h" #elif SOC_AES_GENERAL_DMA #include "hal/gdma_ll.h" #endif uint8_t aes_hal_setkey(const uint8_t *key, size_t key_bytes, int mode) { aes_ll_set_mode(mode, key_bytes); uint8_t key_bytes_in_hardware = aes_ll_write_key(key, key_bytes / 4); /* Used for fault injection check: all words of key data should have been written to hardware */ return key_bytes_in_hardware; } /** * @brief Busy wait until the AES accelerator is idle * */ static inline void aes_hal_wait_idle(void) { while (aes_ll_get_state() != ESP_AES_STATE_IDLE) { } } void aes_hal_transform_block(const void *input_block, void *output_block) { aes_ll_write_block(input_block); aes_ll_start_transform(); aes_hal_wait_idle(); aes_ll_read_block(output_block); } #if SOC_AES_SUPPORT_DMA #if SOC_AES_GENERAL_DMA /** * @brief Initialize the DMA * * @param input AES input descriptor (outlink) * @param output AES output descriptor (inlink) */ static inline void aes_hal_dma_init(const lldesc_t *input, const lldesc_t *output) { /* Update driver when centralized DMA interface implemented, IDF-2192 */ gdma_ll_tx_enable_descriptor_burst(&GDMA, SOC_GDMA_AES_DMA_CHANNEL, false); gdma_ll_tx_enable_data_burst(&GDMA, SOC_GDMA_AES_DMA_CHANNEL, false); gdma_ll_rx_enable_descriptor_burst(&GDMA, SOC_GDMA_AES_DMA_CHANNEL, false); gdma_ll_rx_enable_data_burst(&GDMA, SOC_GDMA_AES_DMA_CHANNEL, false); gdma_ll_tx_connect_to_periph(&GDMA, SOC_GDMA_AES_DMA_CHANNEL, GDMA_LL_PERIPH_ID_AES); gdma_ll_rx_connect_to_periph(&GDMA, SOC_GDMA_AES_DMA_CHANNEL, GDMA_LL_PERIPH_ID_AES); /* An L2 FIFO bigger than 40 bytes is need when accessing external ram */ gdma_ll_tx_extend_fifo_size_to(&GDMA, SOC_GDMA_AES_DMA_CHANNEL, 40); gdma_ll_rx_extend_l2_fifo_size_to(&GDMA, SOC_GDMA_AES_DMA_CHANNEL, 40); gdma_ll_tx_set_block_size_psram(&GDMA, SOC_GDMA_AES_DMA_CHANNEL, GDMA_OUT_EXT_MEM_BK_SIZE_16B); gdma_ll_rx_set_block_size_psram(&GDMA, SOC_GDMA_AES_DMA_CHANNEL, GDMA_OUT_EXT_MEM_BK_SIZE_16B); /* Set descriptors */ gdma_ll_tx_set_desc_addr(&GDMA, SOC_GDMA_AES_DMA_CHANNEL, (uint32_t)input); gdma_ll_rx_set_desc_addr(&GDMA, SOC_GDMA_AES_DMA_CHANNEL, (uint32_t)output); gdma_ll_rx_reset_channel(&GDMA, SOC_GDMA_AES_DMA_CHANNEL); gdma_ll_tx_reset_channel(&GDMA, SOC_GDMA_AES_DMA_CHANNEL); /* Start transfer */ gdma_ll_tx_start(&GDMA, SOC_GDMA_AES_DMA_CHANNEL); gdma_ll_rx_start(&GDMA, SOC_GDMA_AES_DMA_CHANNEL); } static inline bool aes_hal_dma_done(const lldesc_t *output) { return (gdma_ll_rx_is_fsm_idle(&GDMA, SOC_GDMA_AES_DMA_CHANNEL) && (output->owner == 0)); } #endif //SOC_AES_GENERAL_DMA #if SOC_AES_CRYPTO_DMA /** * @brief Initialize the DMA * * @param input AES input descriptor (outlink) * @param output AES output descriptor (inlink) */ static inline void aes_hal_dma_init(const lldesc_t *input, const lldesc_t *output) { crypto_dma_ll_reset(); crypto_dma_ll_set_mode(CRYPTO_DMA_AES); /* Set descriptors, input to AES comes from outlink DMA and viceversa */ crypto_dma_ll_outlink_set((uint32_t)input); crypto_dma_ll_inlink_set((uint32_t)output); /* Start transfer */ crypto_dma_ll_outlink_start(); crypto_dma_ll_inlink_start(); } static inline bool aes_hal_dma_done(lldesc_t *output) { return (crypto_dma_ll_inlink_is_eof() && (output->owner == 0)); } #endif //SOC_AES_CRYPTO_DMA void aes_hal_transform_dma_start(const lldesc_t *input, const lldesc_t *output, size_t num_blocks) { aes_ll_dma_enable(true); aes_hal_dma_init(input, output); /* Write the number of blocks */ aes_ll_set_num_blocks(num_blocks); /* Start encrypting/decrypting */ aes_ll_start_transform(); } void aes_hal_transform_dma_finish(void) { aes_ll_dma_exit(); aes_ll_dma_enable(false); } void aes_hal_mode_init(esp_aes_mode_t mode) { /* Set the algorith mode CBC, CFB ... */ aes_ll_set_block_mode(mode); /* Presently hard-coding the INC function to 32 bit */ if (mode == ESP_AES_BLOCK_MODE_CTR) { aes_ll_set_inc(); } } void aes_hal_set_iv(const uint8_t *iv) { aes_ll_set_iv(iv); } void aes_hal_read_iv(uint8_t *iv) { aes_ll_read_iv(iv); } static inline void aes_hal_wait_done(void) { while (aes_ll_get_state() != ESP_AES_STATE_DONE) {} } void aes_hal_wait_dma_done(lldesc_t *output) { /* Checking this if interrupt is used also, to avoid issues with AES fault injection */ aes_hal_wait_done(); /* Wait for DMA write operation to complete */ while (1) { if ( aes_hal_dma_done(output) ) { break; } } } #endif //SOC_AES_SUPPORT_DMA #if SOC_AES_SUPPORT_GCM void aes_hal_gcm_calc_hash(uint8_t *gcm_hash) { aes_ll_dma_enable(true); aes_ll_start_transform(); aes_hal_wait_idle(); aes_ll_gcm_read_hash(gcm_hash); } void aes_hal_transform_dma_gcm_start(const lldesc_t *input, const lldesc_t *output, size_t num_blocks) { aes_hal_dma_init(input, output); /* Write the number of blocks */ aes_ll_set_num_blocks(num_blocks); /* Start encrypting/decrypting */ aes_ll_cont_transform(); } void aes_hal_gcm_init(size_t aad_num_blocks, size_t num_valid_bit) { aes_ll_gcm_set_aad_num_blocks(aad_num_blocks); aes_ll_gcm_set_num_valid_bit(num_valid_bit); } void aes_hal_gcm_read_tag(uint8_t *tag, size_t tag_len) { uint8_t tag_res[TAG_BYTES]; aes_ll_gcm_read_tag(tag_res); memcpy(tag, tag_res, tag_len); } #endif //SOC_AES_SUPPORT_GCM