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Beslan
165
connectivity/lorawan/lorastack/mac/LoRaMacCrypto.h
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165
connectivity/lorawan/lorastack/mac/LoRaMacCrypto.h
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/**
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\code
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/ _____) _ | |
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( (____ _____ ____ _| |_ _____ ____| |__
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\____ \| ___ | (_ _) ___ |/ ___) _ \
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_____) ) ____| | | || |_| ____( (___| | | |
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(______/|_____)_|_|_| \__)_____)\____)_| |_|
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(C)2013 Semtech
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___ _____ _ ___ _ _____ ___ ___ ___ ___
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/ __|_ _/_\ / __| |/ / __/ _ \| _ \/ __| __|
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\__ \ | |/ _ \ (__| ' <| _| (_) | / (__| _|
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|___/ |_/_/ \_\___|_|\_\_| \___/|_|_\\___|___|
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embedded.connectivity.solutions===============
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\endcode
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Description: LoRa MAC Crypto implementation
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License: Revised BSD License, see LICENSE.TXT file include in the project
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Maintainer: Miguel Luis ( Semtech ), Gregory Cristian ( Semtech ) and Daniel Jaeckle ( STACKFORCE )
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Copyright (c) 2017, Arm Limited and affiliates.
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SPDX-License-Identifier: BSD-3-Clause
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*/
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#ifndef MBED_LORAWAN_MAC_LORAMAC_CRYPTO_H__
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#define MBED_LORAWAN_MAC_LORAMAC_CRYPTO_H__
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#include "mbedtls/aes.h"
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#include "mbedtls/cmac.h"
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class LoRaMacCrypto {
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public:
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/**
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* Constructor
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*/
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LoRaMacCrypto();
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/**
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* Destructor
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*/
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~LoRaMacCrypto();
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/**
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* Computes the LoRaMAC frame MIC field
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*
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* @param [in] buffer - Data buffer
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* @param [in] size - Data buffer size
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* @param [in] key - AES key to be used
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* @param [in] key_length - Length of the key (bits)
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* @param [in] address - Frame address
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* @param [in] dir - Frame direction [0: uplink, 1: downlink]
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* @param [in] seq_counter - Frame sequence counter
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* @param [out] mic - Computed MIC field
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*
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* @return 0 if successful, or a cipher specific error code
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*/
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int compute_mic(const uint8_t *buffer, uint16_t size,
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const uint8_t *key, uint32_t key_length,
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uint32_t address, uint8_t dir, uint32_t seq_counter,
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uint32_t *mic);
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/**
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* Performs payload encryption
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*
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* @param [in] buffer - Data buffer
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* @param [in] size - Data buffer size
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* @param [in] key - AES key to be used
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* @param [in] key_length - Length of the key (bits)
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* @param [in] address - Frame address
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* @param [in] dir - Frame direction [0: uplink, 1: downlink]
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* @param [in] seq_counter - Frame sequence counter
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* @param [out] enc_buffer - Encrypted buffer
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*
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* @return 0 if successful, or a cipher specific error code
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*/
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int encrypt_payload(const uint8_t *buffer, uint16_t size,
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const uint8_t *key, uint32_t key_length,
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uint32_t address, uint8_t dir, uint32_t seq_counter,
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uint8_t *enc_buffer);
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/**
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* Performs payload decryption
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*
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* @param [in] buffer - Data buffer
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* @param [in] size - Data buffer size
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* @param [in] key - AES key to be used
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* @param [in] key_length - Length of the key (bits)
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* @param [in] address - Frame address
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* @param [in] dir - Frame direction [0: uplink, 1: downlink]
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* @param [in] seq_counter - Frame sequence counter
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* @param [out] dec_buffer - Decrypted buffer
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*
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* @return 0 if successful, or a cipher specific error code
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*/
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int decrypt_payload(const uint8_t *buffer, uint16_t size,
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const uint8_t *key, uint32_t key_length,
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uint32_t address, uint8_t dir, uint32_t seq_counter,
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uint8_t *dec_buffer);
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/**
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* Computes the LoRaMAC Join Request frame MIC field
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*
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* @param [in] buffer - Data buffer
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* @param [in] size - Data buffer size
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* @param [in] key - AES key to be used
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* @param [in] key_length - Length of the key (bits)
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* @param [out] mic - Computed MIC field
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*
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* @return 0 if successful, or a cipher specific error code
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*
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*/
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int compute_join_frame_mic(const uint8_t *buffer, uint16_t size,
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const uint8_t *key, uint32_t key_length,
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uint32_t *mic);
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/**
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* Computes the LoRaMAC join frame decryption
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*
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* @param [in] buffer - Data buffer
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* @param [in] size - Data buffer size
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* @param [in] key - AES key to be used
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* @param [in] key_length - Length of the key (bits)
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* @param [out] dec_buffer - Decrypted buffer
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*
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* @return 0 if successful, or a cipher specific error code
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*/
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int decrypt_join_frame(const uint8_t *buffer, uint16_t size,
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const uint8_t *key, uint32_t key_length,
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uint8_t *dec_buffer);
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/**
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* Computes the LoRaMAC join frame decryption
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*
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* @param [in] key - AES key to be used
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* @param [in] key_length - Length of the key (bits)
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* @param [in] app_nonce - Application nonce
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* @param [in] dev_nonce - Device nonce
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* @param [out] nwk_skey - Network session key
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* @param [out] app_skey - Application session key
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*
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* @return 0 if successful, or a cipher specific error code
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*/
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int compute_skeys_for_join_frame(const uint8_t *key, uint32_t key_length,
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const uint8_t *app_nonce, uint16_t dev_nonce,
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uint8_t *nwk_skey, uint8_t *app_skey);
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private:
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/**
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* AES computation context variable
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*/
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mbedtls_aes_context aes_ctx;
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/**
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* CMAC computation context variable
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*/
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mbedtls_cipher_context_t aes_cmac_ctx[1];
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};
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#endif // MBED_LORAWAN_MAC_LORAMAC_CRYPTO_H__
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