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96 lines
2.4 KiB
C
96 lines
2.4 KiB
C
/**
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* \brief AES block cipher, ESP hardware accelerated version, common
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* Based on mbedTLS FIPS-197 compliant version.
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*
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* Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
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* Additions Copyright (C) 2016-2017, Espressif Systems (Shanghai) PTE Ltd
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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/*
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* The AES block cipher was designed by Vincent Rijmen and Joan Daemen.
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*
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* http://csrc.nist.gov/encryption/aes/rijndael/Rijndael.pdf
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* http://csrc.nist.gov/publications/fips/fips197/fips-197.pdf
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*/
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#include "aes/esp_aes_internal.h"
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#include "mbedtls/aes.h"
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#include "hal/aes_hal.h"
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#include "hal/aes_types.h"
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#include "soc/soc_caps.h"
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#include <string.h>
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#include "mbedtls/platform.h"
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#if SOC_AES_GDMA
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#include "esp_aes_dma_priv.h"
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#endif
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bool valid_key_length(const esp_aes_context *ctx)
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{
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bool valid_len = (ctx->key_bytes == AES_128_KEY_BYTES) || (ctx->key_bytes == AES_256_KEY_BYTES);
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#if SOC_AES_SUPPORT_AES_192
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valid_len |= ctx->key_bytes == AES_192_KEY_BYTES;
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#endif
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return valid_len;
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}
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void esp_aes_init( esp_aes_context *ctx )
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{
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bzero( ctx, sizeof( esp_aes_context ) );
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#if SOC_AES_GDMA
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esp_aes_dma_init();
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#endif
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}
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void esp_aes_free( esp_aes_context *ctx )
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{
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if ( ctx == NULL ) {
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return;
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}
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#if SOC_AES_GDMA
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esp_aes_dma_free();
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#endif
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bzero( ctx, sizeof( esp_aes_context ) );
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}
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/*
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* AES key schedule (same for encryption or decryption, as hardware handles schedule)
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*
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*/
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int esp_aes_setkey( esp_aes_context *ctx, const unsigned char *key,
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unsigned int keybits )
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{
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#if !SOC_AES_SUPPORT_AES_192
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if (keybits == 192) {
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return MBEDTLS_ERR_PLATFORM_FEATURE_UNSUPPORTED;
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}
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#endif
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if (keybits != 128 && keybits != 192 && keybits != 256) {
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return MBEDTLS_ERR_AES_INVALID_KEY_LENGTH;
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}
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ctx->key_bytes = keybits / 8;
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memcpy(ctx->key, key, ctx->key_bytes);
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ctx->key_in_hardware = 0;
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return 0;
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}
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