mirror of
https://github.com/IoTManagerProject/IoTManager.git
synced 2026-03-30 11:59:12 +03:00
112 lines
3.6 KiB
C
112 lines
3.6 KiB
C
/*
|
|
* The MySensors Arduino library handles the wireless radio link and protocol
|
|
* between your home built sensors/actuators and HA controller of choice.
|
|
* The sensors forms a self healing radio network with optional repeaters. Each
|
|
* repeater and gateway builds a routing tables in EEPROM which keeps track of the
|
|
* network topology allowing messages to be routed to nodes.
|
|
*
|
|
* Created by Henrik Ekblad <henrik.ekblad@mysensors.org>
|
|
* Copyright (C) 2013-2019 Sensnology AB
|
|
* Full contributor list: https://github.com/mysensors/MySensors/graphs/contributors
|
|
*
|
|
* Documentation: http://www.mysensors.org
|
|
* Support Forum: http://forum.mysensors.org
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* version 2 as published by the Free Software Foundation.
|
|
*
|
|
* AES implementation: https://github.com/kokke/tiny-AES-c
|
|
*/
|
|
|
|
#ifndef _AES_H_
|
|
#define _AES_H_
|
|
|
|
// #define the macros below to 1/0 to enable/disable the mode of operation.
|
|
//
|
|
// CBC enables AES encryption in CBC-mode of operation.
|
|
// CTR enables encryption in counter-mode.
|
|
// ECB enables the basic ECB 16-byte block algorithm. All can be enabled simultaneously.
|
|
|
|
// The #ifndef-guard allows it to be configured before #include'ing or at compile time.
|
|
#ifndef CBC
|
|
#define CBC 1
|
|
#endif
|
|
|
|
#ifndef ECB
|
|
#define ECB 0
|
|
#endif
|
|
|
|
#ifndef CTR
|
|
#define CTR 0
|
|
#endif
|
|
|
|
|
|
#define AES128 1
|
|
//#define AES192 1
|
|
//#define AES256 1
|
|
|
|
#define AES_BLOCKLEN 16 //Block length in bytes AES is 128b block only
|
|
|
|
#if defined(AES256) && (AES256 == 1)
|
|
#define AES_KEYLEN 32
|
|
#define AES_keyExpSize 240
|
|
#elif defined(AES192) && (AES192 == 1)
|
|
#define AES_KEYLEN 24
|
|
#define AES_keyExpSize 208
|
|
#else
|
|
#define AES_KEYLEN 16 // Key length in bytes
|
|
#define AES_keyExpSize 176
|
|
#endif
|
|
|
|
/**
|
|
* @brief AES state structure
|
|
*/
|
|
struct AES_ctx {
|
|
uint8_t RoundKey[AES_keyExpSize]; //!< RoundKey
|
|
#if (defined(CBC) && (CBC == 1)) || (defined(CTR) && (CTR == 1))
|
|
uint8_t Iv[AES_BLOCKLEN]; //!< Iv
|
|
#endif
|
|
};
|
|
|
|
void AES_init_ctx(struct AES_ctx* ctx, const uint8_t* key);
|
|
#if (defined(CBC) && (CBC == 1)) || (defined(CTR) && (CTR == 1))
|
|
void AES_init_ctx_iv(struct AES_ctx* ctx, const uint8_t* key, const uint8_t* iv);
|
|
void AES_ctx_set_iv(struct AES_ctx* ctx, const uint8_t* iv);
|
|
#endif
|
|
|
|
#if defined(ECB) && (ECB == 1)
|
|
// buffer size is exactly AES_BLOCKLEN bytes;
|
|
// you need only AES_init_ctx as IV is not used in ECB
|
|
// NB: ECB is considered insecure for most uses
|
|
void AES_ECB_encrypt(const struct AES_ctx* ctx, uint8_t* buf);
|
|
void AES_ECB_decrypt(const struct AES_ctx* ctx, uint8_t* buf);
|
|
|
|
#endif // #if defined(ECB) && (ECB == !)
|
|
|
|
|
|
#if defined(CBC) && (CBC == 1)
|
|
// buffer size MUST be mutile of AES_BLOCKLEN;
|
|
// Suggest https://en.wikipedia.org/wiki/Padding_(cryptography)#PKCS7 for padding scheme
|
|
// NOTES: you need to set IV in ctx via AES_init_ctx_iv() or AES_ctx_set_iv()
|
|
// no IV should ever be reused with the same key
|
|
void AES_CBC_encrypt_buffer(struct AES_ctx* ctx, uint8_t* buf, uint32_t length);
|
|
void AES_CBC_decrypt_buffer(struct AES_ctx* ctx, uint8_t* buf, uint32_t length);
|
|
|
|
#endif // #if defined(CBC) && (CBC == 1)
|
|
|
|
|
|
#if defined(CTR) && (CTR == 1)
|
|
|
|
// Same function for encrypting as for decrypting.
|
|
// IV is incremented for every block, and used after encryption as XOR-compliment for output
|
|
// Suggesting https://en.wikipedia.org/wiki/Padding_(cryptography)#PKCS7 for padding scheme
|
|
// NOTES: you need to set IV in ctx with AES_init_ctx_iv() or AES_ctx_set_iv()
|
|
// no IV should ever be reused with the same key
|
|
void AES_CTR_xcrypt_buffer(struct AES_ctx* ctx, uint8_t* buf, uint32_t length);
|
|
|
|
#endif // #if defined(CTR) && (CTR == 1)
|
|
|
|
|
|
#endif //_AES_H_
|