MultiTech
fota lib for mdot
Diff: mdot/Lora/Crypto.h
- Revision:
- 3:63d10f2375ea
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/mdot/Lora/Crypto.h Fri Sep 14 15:39:09 2018 -0500
@@ -0,0 +1,153 @@
+/* ______ _
+ / _____) _ | |
+ ( (____ _____ ____ _| |_ _____ ____| |__
+ \____ \| ___ | (_ _) ___ |/ ___) _ \
+ _____) ) ____| | | || |_| ____( (___| | | |
+ (______/|_____)_|_|_| \__)_____)\____)_| |_|
+ (C)2013 Semtech
+
+ Description: LoRa MAC layer implementation
+
+ License: Revised BSD License, see LICENSE.TXT file include in the project
+
+ Maintainer: Miguel Luis and Gregory Cristian
+ */
+#ifndef __LORA_CRYPTO_H__
+#define __LORA_CRYPTO_H__
+
+#include "casado/aes.h"
+#include "gladman/cmac.h"
+#include <cstring>
+#include <inttypes.h>
+
+namespace lora {
+
+ class Crypto
+ {
+ public:
+ Crypto(void);
+
+ /*!
+ * Computes the LoRaMAC frame MIC field
+ *
+ * \param [IN] buffer Data buffer
+ * \param [IN] size Data buffer size
+ * \param [IN] key AES key to be used
+ * \param [IN] address Frame address
+ * \param [IN] dir Frame direction [0: uplink, 1: downlink, 2:peer]
+ * \param [IN] sequenceCounter Frame sequence counter
+ * \param [OUT] mic Computed MIC field
+ */
+ void ComputeMic(uint8_t *buffer, uint16_t size, uint8_t *key, uint32_t address, uint8_t dir, uint32_t sequenceCounter, uint32_t *mic);
+
+ /*!
+ * Computes the LoRaMAC payload encryption
+ *
+ * \param [IN] buffer Data buffer
+ * \param [IN] size Data buffer size
+ * \param [IN] key AES key to be used
+ * \param [IN] address Frame address
+ * \param [IN] dir Frame direction [0: uplink, 1: downlink, 2:peer]
+ * \param [IN] sequenceCounter Frame sequence counter
+ * \param [OUT] encBuffer Encrypted buffer
+ */
+ void PayloadEncrypt(const uint8_t *buffer, uint16_t size, uint8_t *key, uint32_t address, uint8_t dir, uint32_t sequenceCounter, uint8_t *encBuffer);
+
+ /*!
+ * Computes the LoRaMAC payload decryption
+ *
+ * \param [IN] buffer Data buffer
+ * \param [IN] size Data buffer size
+ * \param [IN] key AES key to be used
+ * \param [IN] address Frame address
+ * \param [IN] dir Frame direction [0: uplink, 1: downlink, 2:peer]
+ * \param [IN] sequenceCounter Frame sequence counter
+ * \param [OUT] decBuffer Decrypted buffer
+ */
+ void PayloadDecrypt(uint8_t *buffer, uint16_t size, uint8_t *key, uint32_t address, uint8_t dir, uint32_t sequenceCounter, uint8_t *decBuffer);
+
+ /*!
+ * Computes the LoRaMAC Join Request frame MIC field
+ *
+ * \param [IN] buffer Data buffer
+ * \param [IN] size Data buffer size
+ * \param [IN] key AES key to be used
+ * \param [OUT] mic Computed MIC field
+ */
+ void JoinComputeMic(const uint8_t *buffer, uint16_t size, const uint8_t *key, uint32_t *mic);
+
+ /*!
+ * Computes the LoRaMAC join frame decryption
+ *
+ * \param [IN] buffer Data buffer
+ * \param [IN] size Data buffer size
+ * \param [IN] key AES key to be used
+ * \param [OUT] decBuffer Decrypted buffer
+ */
+ void JoinDecrypt(uint8_t *buffer, uint16_t size, uint8_t *key, uint8_t *decBuffer);
+
+ /*!
+ * Computes the LoRaMAC join frame decryption
+ *
+ * \param [IN] key AES key to be used
+ * \param [IN] appNonce Application nonce
+ * \param [IN] devNonce Device nonce
+ * \param [OUT] nwkSKey Network session key
+ * \param [OUT] appSKey Application session key
+ */
+ void DeriveSessionKeys(uint8_t *key, uint8_t *appNonce, uint8_t *netID, uint16_t devNonce, uint8_t *nwkSKey, uint8_t *appSKey);
+
+ /*!
+ * Compute ping slot for current beacon frame
+ * \param [IN] beaconTime Time of current beacon
+ * \param [IN] devAddr Device Address
+ * \param [IN] period Period of downlink
+ * \return current pinslot
+ */
+ uint32_t ComputePingSlot(uint32_t beaconTime, uint32_t devAddr, uint32_t period);
+
+ /*!
+ * Helper to copy mic bytes onto buffer
+ * \param [IN] mic integer mic value
+ * \param [IN] buff location to copy to
+ */
+ void CopyMicToArray(uint32_t mic, uint8_t* buff);
+
+ void DeriveMcKEKey(uint8_t *mcKEKey, uint8_t *appKey, uint8_t *EUI);
+
+ void DeriveMcKey(uint8_t *mcKey, uint8_t *mcKeyEncrypt, uint8_t *mcKEKey);
+
+ void DeriveMcSessionKeys(uint8_t *mcAppKey, uint8_t *mcNetKey, uint8_t *mcKey, uint8_t *mcAddr);
+
+ private:
+ /*!
+ * MIC field computation initial data
+ */
+ uint8_t MicBlockB0[16];
+
+ /*!
+ * Contains the computed MIC field.
+ *
+ * \remark Only the 4 first bytes are used
+ */
+ uint8_t Mic[16];
+
+ /*!
+ * Encryption aBlock and sBlock
+ */
+ uint8_t aBlock[16];
+ uint8_t sBlock[16];
+
+ /*!
+ * AES computation context variable
+ */
+ aes_context AesContext;
+
+ /*!
+ * CMAC computation context variable
+ */
+ AES_CMAC_CTX AesCmacCtx[1];
+ };
+
+}
+#endif // __LORAMAC_CRYPTO_H__
