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DMR TYT BP (16-bit) Encryption Mode; #302

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Above Commit is by Anonymous Submission;
This commit is contained in:
lwvmobile
2025-08-16 10:18:10 -04:00
parent 41865f3af7
commit c7b25c60af
4 changed files with 107 additions and 107 deletions
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3
include/dsd.h
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@@ -1162,6 +1162,7 @@ void keyring(dsd_opts * opts, dsd_state * state);
void read_sdrtrunk_json_format (dsd_opts * opts, dsd_state * state);
void ambe2_codeword_print_f (dsd_opts * opts, char ambe_fr[4][24]);
void ambe2_codeword_print_b (dsd_opts * opts, char ambe_fr[4][24]);
void ambe2_codeword_print_i (dsd_opts * opts, char ambe_fr[4][24]);
void openMbeInFile (dsd_opts * opts, dsd_state * state);
void closeMbeOutFile (dsd_opts * opts, dsd_state * state);
void closeMbeOutFileR (dsd_opts * opts, dsd_state * state); //tdma slot 2
@@ -1613,7 +1614,7 @@ void aes_ctr_bytewise_payload_crypt (uint8_t * iv, uint8_t * key, uint8_t * payl
void aes_ctr_bitwise_payload_crypt (uint8_t * iv, uint8_t * key, uint8_t * payload, int type);
//Tytera Encryption Modes
int tyt16_ambe2_codeword_keystream(dsd_state * state, char ambe_fr[4][24], int idx, int fnum);
void tyt16_ambe2_codeword_keystream(dsd_state * state, char ambe_fr[4][24], int fnum);
//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);

147
src/crypt-tyt.c
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@@ -1,4 +1,41 @@
#include "dsd.h"
#include "dmr_const.h"
//interleaved code words for AMBE+2
void ambe2_codeword_print_i (dsd_opts * opts, char ambe_fr[4][24])
{
uint8_t interleaved[72];
memset (interleaved, 0, sizeof(interleaved));
//reinterleave the frame
const int *w, *x, *y, *z;
w = rW; x = rX; y = rY; z = rZ;
for (int8_t i = 0; i < 36; i++)
{
interleaved[(i*2)+0] = (uint8_t)ambe_fr[*w][*x];
interleaved[(i*2)+1] = (uint8_t)ambe_fr[*y][*z];
w++;
x++;
y++;
z++;
}
uint8_t bytes[9]; memset(bytes, 0, sizeof(bytes));
//pack
pack_bit_array_into_byte_array(interleaved, bytes, 9);
if (opts->payload == 1)
{
fprintf (stderr, " AMBE HEX(72) INT: ");
for (int8_t i = 0; i < 9; i++)
fprintf (stderr, "%02X", bytes[i]);
fprintf (stderr, "\n");
}
}
//de-interleaved code words for AMBE+2
void ambe2_codeword_print_b (dsd_opts * opts, char ambe_fr[4][24])
@@ -57,86 +94,64 @@ void ambe2_codeword_print_f (dsd_opts * opts, char ambe_fr[4][24])
}
//test application of keystream to codewords instead of ambe_d (tytera / retevis, etc)
int tyt16_ambe2_codeword_keystream(dsd_state * state, char ambe_fr[4][24], int idx, int fnum)
//tested working perfectly fine on some Tytera BP samples, but not on others
//is there two or more different Tytera (or CCR) BP modes depending on FW?
void tyt16_ambe2_codeword_keystream(dsd_state * state, char ambe_fr[4][24], int fnum)
{
uint8_t ks_bytes[28]; memset(ks_bytes, 0, sizeof(ks_bytes));
uint8_t ks[224]; memset(ks, 0, sizeof(ks));
UNUSED(fnum);
char interleaved[72];
memset (interleaved, 0, sizeof(interleaved));
//interleave the frame
const int *w, *x, *y, *z;
w = rW; x = rX; y = rY; z = rZ;
for (int8_t i = 0; i < 36; i++)
{
interleaved[(i*2)+0] = ambe_fr[*w][*x];
interleaved[(i*2)+1] = ambe_fr[*y][*z];
w++;
x++;
y++;
z++;
}
uint8_t ks_bytes[10]; memset(ks_bytes, 0, sizeof(ks_bytes));
uint8_t ks[80]; memset(ks, 0, sizeof(ks));
ks_bytes[0] = (state->H >> 8) & 0xFF;
ks_bytes[1] = (state->H >> 0) & 0xFF;
//copy same bytes into rest of byte array
for (int16_t i = 2; i < 28; i++)
for (int16_t i = 2; i < 10; i++)
ks_bytes[i] = ks_bytes[i%2];
//debug ks_bytes
// fprintf (stderr, " KB: ");
// for (int16_t i = 0; i < 28; i++)
// fprintf (stderr, "%02X ", ks_bytes[i]);
// fprintf (stderr, "\n");
//convert byte array into a bit array
unpack_byte_array_into_bit_array(ks_bytes, ks, 28);
//debug ks
// fprintf (stderr, " KS: ");
// for (int16_t i = 0; i < 28; i++)
// fprintf (stderr, "%02X ", (uint8_t)convert_bits_into_output(ks+(i*8), 8));
// fprintf (stderr, "\n");
//debug to test application to ambe_fr result
// memset(ambe_fr, 0, 4*24*sizeof(char));
unpack_byte_array_into_bit_array(ks_bytes, ks, 10);
//set ks idx position (-1)
int idx = 0;
if (fnum == 0)
idx = 0;
else idx = 8;
idx = 79;
else idx = 71;
//straight?
for (int16_t i = 0; i < 24; i++)
ambe_fr[0][i] ^= ks[((idx++)%216)] ^ 1; //%216
//apply keystream to interleave
for (int8_t i = 0; i < 72; i++)
interleaved[i] ^= ks[idx--];
for (int16_t i = 0; i < 23; i++)
ambe_fr[1][i] ^= ks[((idx++)%216)] ^ 1; //%216
for (int16_t i = 0; i < 11; i++)
ambe_fr[2][i] ^= ks[((idx++)%216)] ^ 1; //%216
for (int16_t i = 0; i < 14; i++)
ambe_fr[3][i] ^= ks[((idx++)%216)] ^ 1; //%216
//backwards?
// for (int16_t i = 13; i >= 0; i--)
// ambe_fr[3][i] ^= ks[((idx++)%216)] ^ 1; //%216
// for (int16_t i = 10; i >= 0; i--)
// ambe_fr[2][i] ^= ks[((idx++)%216)] ^ 1; //%216
// for (int16_t i = 22; i >= 0; i--)
// ambe_fr[1][i] ^= ks[((idx++)%216)] ^ 1; //%216
// for (int16_t i = 23; i >= 0; i--)
// ambe_fr[0][i] ^= ks[((idx++)%216)] ^ 1; //%216
//forwards?
// for (int16_t i = 23; i >= 0; i--)
// ambe_fr[0][i] ^= ks[((idx++)%216)] ^ 1; //%216
// for (int16_t i = 22; i >= 0; i--)
// ambe_fr[1][i] ^= ks[((idx++)%216)] ^ 1; //%216
// for (int16_t i = 10; i >= 0; i--)
// ambe_fr[2][i] ^= ks[((idx++)%216)] ^ 1; //%216
// for (int16_t i = 13; i >= 0; i--)
// ambe_fr[3][i] ^= ks[((idx++)%216)] ^ 1; //%216
//debug idx value
fprintf (stderr, " KS IDX: %04d; \n", idx);
return idx;
//deinterleave back into ambe_fr frame
w = rW; x = rX; y = rY; z = rZ;
int k = 0;
for (int8_t i = 0; i < 36; i++)
{
ambe_fr[*w][*x] = interleaved[k++];
ambe_fr[*y][*z] = interleaved[k++];
w++;
x++;
y++;
z++;
}
}

34
src/dmr_bs.c
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@@ -22,10 +22,6 @@ void dmrBS (dsd_opts * opts, dsd_state * state)
char ambe_fr2[4][24];
char ambe_fr3[4][24];
int ks_idx[2];
ks_idx[0] = 0;
ks_idx[1] = 0;
//redundancy check (carrier signal loss event)
char redundancyA[36];
char redundancyB[36];
@@ -501,16 +497,15 @@ void dmrBS (dsd_opts * opts, dsd_state * state)
if (state->tyt_bp == 1)
{
ks_idx[internalslot] = tyt16_ambe2_codeword_keystream(state, ambe_fr, ks_idx[internalslot], 0);
ks_idx[internalslot] = tyt16_ambe2_codeword_keystream(state, ambe_fr2, ks_idx[internalslot], 1);
ks_idx[internalslot] = tyt16_ambe2_codeword_keystream(state, ambe_fr3, ks_idx[internalslot], 0);
// ks_idx[internalslot] = 0; //move, or needed elsewhere?
tyt16_ambe2_codeword_keystream(state, ambe_fr, 0);
tyt16_ambe2_codeword_keystream(state, ambe_fr2, 1);
tyt16_ambe2_codeword_keystream(state, ambe_fr3, 0);
}
#ifdef PRINT_AMBE72
ambe2_codeword_print_b(opts, ambe_fr);
ambe2_codeword_print_b(opts, ambe_fr2);
ambe2_codeword_print_b(opts, ambe_fr3);
ambe2_codeword_print_i(opts, ambe_fr);
ambe2_codeword_print_i(opts, ambe_fr2);
ambe2_codeword_print_i(opts, ambe_fr3);
#endif
processMbeFrame (opts, state, NULL, ambe_fr, NULL);
@@ -736,10 +731,6 @@ void dmrBSBootstrap (dsd_opts * opts, dsd_state * state)
char ambe_fr2[4][24];
char ambe_fr3[4][24];
int ks_idx[2];
ks_idx[0] = 0;
ks_idx[1] = 0;
memset (ambe_fr, 0, sizeof(ambe_fr));
memset (ambe_fr2, 0, sizeof(ambe_fr2));
memset (ambe_fr3, 0, sizeof(ambe_fr3));
@@ -948,16 +939,15 @@ void dmrBSBootstrap (dsd_opts * opts, dsd_state * state)
if (state->tyt_bp == 1)
{
ks_idx[internalslot] = tyt16_ambe2_codeword_keystream(state, ambe_fr, ks_idx[internalslot], 0);
ks_idx[internalslot] = tyt16_ambe2_codeword_keystream(state, ambe_fr2, ks_idx[internalslot], 1);
ks_idx[internalslot] = tyt16_ambe2_codeword_keystream(state, ambe_fr3, ks_idx[internalslot], 0);
ks_idx[internalslot] = 0; //doesn't matter in this location
tyt16_ambe2_codeword_keystream(state, ambe_fr, 0);
tyt16_ambe2_codeword_keystream(state, ambe_fr2, 1);
tyt16_ambe2_codeword_keystream(state, ambe_fr3, 0);
}
#ifdef PRINT_AMBE72
ambe2_codeword_print_b(opts, ambe_fr);
ambe2_codeword_print_b(opts, ambe_fr2);
ambe2_codeword_print_b(opts, ambe_fr3);
ambe2_codeword_print_i(opts, ambe_fr);
ambe2_codeword_print_i(opts, ambe_fr2);
ambe2_codeword_print_i(opts, ambe_fr3);
#endif
if (opts->payload == 1) fprintf (stderr, "\n"); //extra line break necessary here

30
src/dmr_ms.c
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@@ -23,8 +23,6 @@ void dmrMS (dsd_opts * opts, dsd_state * state)
char ambe_fr3[4][24];
char ambe_fr4[4][24];
int ks_idx = 0;
//memcpy of ambe_fr for late entry
uint8_t m1[4][24];
uint8_t m2[4][24];
@@ -250,16 +248,15 @@ void dmrMS (dsd_opts * opts, dsd_state * state)
if (state->tyt_bp == 1)
{
ks_idx = tyt16_ambe2_codeword_keystream(state, ambe_fr, ks_idx, 0);
ks_idx = tyt16_ambe2_codeword_keystream(state, ambe_fr2, ks_idx, 1);
ks_idx = tyt16_ambe2_codeword_keystream(state, ambe_fr3, ks_idx, 0);
// ks_idx = 0; //needed?
tyt16_ambe2_codeword_keystream(state, ambe_fr, 0);
tyt16_ambe2_codeword_keystream(state, ambe_fr2, 1);
tyt16_ambe2_codeword_keystream(state, ambe_fr3, 0);
}
#ifdef PRINT_AMBE72
ambe2_codeword_print_b(opts, ambe_fr);
ambe2_codeword_print_b(opts, ambe_fr2);
ambe2_codeword_print_b(opts, ambe_fr3);
ambe2_codeword_print_i(opts, ambe_fr);
ambe2_codeword_print_i(opts, ambe_fr2);
ambe2_codeword_print_i(opts, ambe_fr3);
#endif
processMbeFrame (opts, state, NULL, ambe_fr, NULL);
@@ -384,8 +381,6 @@ void dmrMSBootstrap (dsd_opts * opts, dsd_state * state)
memset (ambe_fr2, 0, sizeof(ambe_fr2));
memset (ambe_fr3, 0, sizeof(ambe_fr3));
int ks_idx = 0;
//memcpy of ambe_fr for late entry
uint8_t m1[4][24];
uint8_t m2[4][24];
@@ -558,16 +553,15 @@ void dmrMSBootstrap (dsd_opts * opts, dsd_state * state)
if (state->tyt_bp == 1)
{
ks_idx = tyt16_ambe2_codeword_keystream(state, ambe_fr, ks_idx, 0);
ks_idx = tyt16_ambe2_codeword_keystream(state, ambe_fr2, ks_idx, 1);
ks_idx = tyt16_ambe2_codeword_keystream(state, ambe_fr3, ks_idx, 0);
// ks_idx = 0; //needed?
tyt16_ambe2_codeword_keystream(state, ambe_fr, 0);
tyt16_ambe2_codeword_keystream(state, ambe_fr2, 1);
tyt16_ambe2_codeword_keystream(state, ambe_fr3, 0);
}
#ifdef PRINT_AMBE72
ambe2_codeword_print_b(opts, ambe_fr);
ambe2_codeword_print_b(opts, ambe_fr2);
ambe2_codeword_print_b(opts, ambe_fr3);
ambe2_codeword_print_i(opts, ambe_fr);
ambe2_codeword_print_i(opts, ambe_fr2);
ambe2_codeword_print_i(opts, ambe_fr3);
#endif
processMbeFrame (opts, state, NULL, ambe_fr, NULL);