cs_AES.h

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/*
 * Author: Crownstone Team
 * Copyright: Crownstone (https://crownstone.rocks)
 * Date: Oct 16, 2020
 * License: LGPLv3+, Apache License 2.0, and/or MIT (triple-licensed)
 */
 
#pragma once
 
#include <nrf_soc.h>
#include <structs/cs_PacketsInternal.h>
 
#define AES_BLOCK_SIZE 16
 
class AES {
public:
    static AES& getInstance() {
        static AES instance;
        return instance;
    }
 
    void init();
 
    cs_ret_code_t encryptEcb(
            cs_data_t key, cs_data_t prefix, cs_data_t input, cs_data_t output, cs_buffer_size_t& writtenSize);
 
    cs_ret_code_t encryptCtr(
            cs_data_t key,
            cs_data_t nonce,
            cs_data_t prefix,
            cs_data_t input,
            cs_data_t output,
            cs_buffer_size_t& writtenSize,
            uint8_t blockCtr = 0);
 
    cs_ret_code_t decryptCtr(
            cs_data_t key,
            cs_data_t nonce,
            cs_data_t input,
            cs_data_t prefix,
            cs_data_t output,
            cs_buffer_size_t& writtenSize,
            uint8_t blockCtr = 0);
 
private:
    // This class is singleton, make constructor private.
    AES();
 
    // This class is singleton, deny implementation
    AES(AES const&);
 
    // This class is singleton, deny implementation
    void operator=(AES const&);
 
    cs_ret_code_t ctr(
            cs_data_t key,
            cs_data_t nonce,
            cs_data_t inputPrefix,
            cs_data_t input,
            cs_data_t outputPrefix,
            cs_data_t output,
            cs_buffer_size_t& writtenSize,
            uint8_t blockCtr = 0);
 
    nrf_ecb_hal_data_t _block __attribute__((aligned(4)));
};