c87200a80d
- Create `Include/` folder for all main projects - Fix some issues here and there (found while moving things) - All includes are now in `Tactility/` subfolder and must be included with that prefix. This fixes issues with clashing POSIX headers (e.g. `<semaphore.h>` versus Tactility's `Semaphore.h`)
64 lines
2.0 KiB
C++
64 lines
2.0 KiB
C++
/** @file secure.h
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*
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* @brief Hardware-bound encryption methods.
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* @warning Enable secure boot and flash encryption to increase security.
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*
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* Offers AES 256 CBC encryption with built-in key.
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* The key is built from data including:
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* - the internal factory MAC address
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* - random data stored in NVS
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*
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* It's important to use flash encryption to avoid an attacker to get
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* access to your encrypted data. If flash encryption is disabled,
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* someone can fetch the key from the partitions.
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*
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* See:
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* https://docs.espressif.com/projects/esp-idf/en/latest/esp32/security/secure-boot-v2.html
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* https://docs.espressif.com/projects/esp-idf/en/latest/esp32/security/flash-encryption.html
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*/
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#pragma once
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#include <cstdio>
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#include <cstdint>
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#include <string>
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namespace tt::crypt {
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/**
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* @brief Fills the IV with zeros and then creates an IV based on the input data.
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* @param[in] data input data
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* @param[in] dataLength input data length
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* @param[out] iv output IV
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*/
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void getIv(const void* data, size_t dataLength, uint8_t iv[16]);
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/**
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* @brief Encrypt data.
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*
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* Important: Use flash encryption to increase security.
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* Important: input and output data must be aligned to 16 bytes.
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*
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* @param[in] iv the AES IV
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* @param[in] inData input data
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* @param[out] outData output data
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* @param[in] dataLength data length, a multiple of 16 (for both inData and outData)
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* @return the result of esp_aes_crypt_cbc() (MBEDTLS_ERR_*)
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*/
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int encrypt(const uint8_t iv[16], uint8_t* inData, uint8_t* outData, size_t dataLength);
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/**
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* @brief Decrypt data.
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*
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* Important: Use flash encryption to increase security.
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* Important: input and output data must be aligned to 16 bytes.
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*
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* @param[in] iv AES IV
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* @param[in] inData input data
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* @param[out] outData output data
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* @param[in] dataLength data length, a multiple of 16 (for both inData and outData)
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* @return the result of esp_aes_crypt_cbc() (MBEDTLS_ERR_*)
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*/
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int decrypt(const uint8_t iv[16], uint8_t* inData, uint8_t* outData, size_t dataLength);
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} // namespace
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