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DMR: Hytera Over the Air Encryption (Signalling Encryption) Support; #373

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DMR: Fix Hytera PDU Decryption to operate at Block Level; (Fixes confirmed data); #372

DMR: Hytera Enhanced RC4 allows variable len output for OTA, PDU or Voice;

DMR: Fix Segfault in RS12,9 encoder function where freeing static memory caused a crash;

Misc Code tweaks to accomodate new features;
This commit is contained in:
lwvmobile
2026-11-06 21:22:38 -05:00
parent 587181f4de
commit bfa4891965
15 changed files with 1825 additions and 261 deletions
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36
include/dsd.h
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@@ -935,6 +935,20 @@ typedef struct
int ras_permutation_order[104];
uint8_t dmr_is_ras; //indicate a partial or complete RAS enabled system
//Hytera OTA Key Variables
// #define DEBUG_HOTA
uint8_t hota_enc_check;
uint8_t hota_key_loaded;
uint8_t dmr_is_hota;
int hota_bit_shift;
int hota_byte_shifts[12];
uint8_t hota_rc4_key[16];
uint8_t hota_rc4_ks[80];
uint8_t hota_lc_ctx[2][4];
uint8_t hota_ctx_ok[2];
int hota_sbrc_idx1[2];
int hota_sbrc_idx2[2];
//Bitmap Filtering Options
int audio_smoothing;
@@ -1378,6 +1392,7 @@ void BPTCDeInterleaveDMRData(uint8_t * Input, uint8_t * Output);
uint32_t BPTC_196x96_Extract_Data(uint8_t InputDeInteleavedData[196], uint8_t DMRDataExtracted[96], uint8_t R[3], uint8_t * is_ras);
uint32_t BPTC_128x77_Extract_Data(uint8_t InputDataMatrix[8][16], uint8_t DMRDataExtracted[77]);
uint32_t BPTC_16x2_Extract_Data(uint8_t InputInterleavedData[32], uint8_t DMRDataExtracted[32], uint32_t ParityCheckTypeOdd);
uint32_t BPTC_128x77_Check_Errors(uint8_t InputDataMatrix[8][16]);
//Reed Solomon DMR functions
void rs_16_13_encode(uint8_t * input);
@@ -1516,6 +1531,11 @@ void LFSRP(dsd_state * state);
void LFSRN (char * BufferIn, char * BufferOut, dsd_state * state);
void LFSR64(dsd_state * state);
//IV Reversals using LFSR tap +1 arrangements
uint64_t reverse_lfsr_32a_to_len(uint8_t * iv, int16_t len);
uint64_t reverse_lfsr_32d_to_len(uint8_t * iv, int16_t len);
uint64_t reverse_lfsr_64_to_len(dsd_opts * opts, uint8_t * iv, int16_t len);
void Hamming_7_4_init();
void Hamming_7_4_encode(unsigned char *origBits, unsigned char *encodedBits);
bool Hamming_7_4_decode(unsigned char *rxBits);
@@ -1680,7 +1700,7 @@ uint32_t kirisun_lfsr(unsigned long long int mi);
void kirisun_keystream_creation(dsd_state * state);
//Hytera Enhanced
void hytera_enhanced_rc4_setup(dsd_opts * opts, dsd_state * state, unsigned long long int key_value, unsigned long long int mi_value);
void hytera_enhanced_rc4_setup(dsd_opts * opts, dsd_state * state, unsigned long long int key_value, unsigned long long int mi_value, int len);
unsigned long long int hytera_lfsr(uint8_t * mi, uint8_t * taps, uint8_t len);
void hytera_enhanced_alg_refresh(dsd_state * state);
@@ -1689,6 +1709,20 @@ uint32_t ras_mac_calculator(dsd_state * state, uint8_t * input, int input_len, i
void ras_effective_key_creation(dsd_state * state, char * input);
void ras_permute_order(uint32_t seed, int * order);
//Hytera OTA Encryption
void hytera_ota_keystream_setup(dsd_state * state, char * input);
void hytera_ota_decrypt_bptc_96(dsd_state * state, uint8_t * input, uint8_t type);
void hytera_ota_decrypt_emb_lc(dsd_state * state, uint8_t input[8][16]);
void hytera_ota_search_emb_lc(dsd_state * state, uint8_t input[8][16]);
void hytera_ota_decrypt_sb_rc(dsd_state * state, uint8_t * input);
void hytera_ota_search_sb_rc(dsd_state * state, uint8_t * input, int ptype);
void hytera_create_lc_ctx(dsd_state * state, uint8_t * input);
void hytera_ota_unit_testing(dsd_state * state);
//Hytera Decryption for Data Blocks
uint8_t hytera_bp_data_decrypt(dsd_state * state, uint8_t * input, int len);
uint8_t hytera_ep_data_decrypt(dsd_opts * opts, dsd_state * state, uint8_t * input, int len);
//LFSR to expand either a DMR 32-bit or P25/NXDN 64-bit MI into a 128-bit IV for AES
void lfsr_32_to_128(uint8_t * iv);
void lfsr_64_to_128(uint8_t * iv);