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Add Generic Static AMBE Keystream Support; #303

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Adding a new method to allow a user to enter a generic keystream len and static keystream via a string that is loaded into a bit array to xor against ambe frames;

This method is intended to be used to allow
This commit is contained in:
lwvmobile
2025-08-22 14:02:09 -04:00
parent 24c1dd97df
commit a5151686ec
4 changed files with 101 additions and 8 deletions
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5
include/dsd.h
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@@ -998,6 +998,10 @@ typedef struct
//anytone bp
int any_bp;
//generic ks
int straight_ks;
int straight_mod;
uint8_t static_ks_bits[2][882];
int static_ks_counter[2];
@@ -1632,6 +1636,7 @@ void tyt_ap_pc4_keystream_creation(dsd_state * state, char * input);
//Misc Other Encryption Modes
void ken_dmr_scrambler_keystream_creation(dsd_state * state, char * input);
void anytone_bp_keystream_creation(dsd_state * state, char * input);
void straight_mod_xor_keystream_creation(dsd_state * state, char * input);
//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);

53
src/crypt-etc.c
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@@ -70,4 +70,57 @@ void anytone_bp_keystream_creation(dsd_state * state, char * input)
fprintf (stderr,"DMR Anytone Basic 16-bit Key 0x%04X with Forced Application\n", key);
state->any_bp = 1;
}
void straight_mod_xor_keystream_creation(dsd_state * state, char * input)
{
uint16_t len = 0;
char * curr;
curr = strtok(input, ":"); //should be len (mod) of key (decimal)
if (curr != NULL)
sscanf (curr, "%hd", &len);
else goto END_KS;
//len sanity check, can't be greater than 882
if (len > 882)
len = 882;
curr = strtok(NULL, ":"); //should be key in hex
if (curr != NULL)
{
//continue
}
else goto END_KS;
uint8_t ks_bytes[112];
memset (ks_bytes, 0, sizeof(ks_bytes));
parse_raw_user_string(curr, ks_bytes);
uint8_t ks_bits[896];
memset(ks_bits, 0, sizeof(ks_bits));
uint16_t unpack_len = len / 8;
if (len % 8)
unpack_len++;
unpack_byte_array_into_bit_array(ks_bytes, ks_bits, unpack_len);
for (uint16_t i = 0; i < len; i++)
{
state->static_ks_bits[0][i] = ks_bits[i];
state->static_ks_bits[1][i] = ks_bits[i];
}
fprintf (stderr,"AMBE Straight XOR %d-bit Keystream: ", len);
for (uint16_t i = 0; i < unpack_len; i++)
fprintf (stderr, "%02X", ks_bytes[i]);
fprintf (stderr, " with Forced Application \n");
state->straight_ks = 1;
state->straight_mod = (int)len;
END_KS:
if (curr == NULL)
fprintf (stderr, "Straight KS String Malformed! No KS Created!\n");
}

31
src/dsd_main.c
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@@ -1067,6 +1067,8 @@
state->ken_sc = 0;
state->any_bp = 0;
state->straight_ks = 0;
state->straight_mod = 0;
//ks array storage and counters
memset (state->ks_octetL, 0, sizeof(state->ks_octetL));
@@ -1485,8 +1487,8 @@
printf (" Input Rate Default is 48000; Use Multiples of 8000 up to 48000.\n");
printf (" VOX Enabled on 1; (Default = 0)\n");
printf (" Values not entered into the M17: string are set to default values.\n");
printf (" -S M17 Packet Encoder SMS String: No more than 772 chars, use single quotations (see example above).\n");
printf (" -S M17 Stream Encoder SMS String: No more than 48 chars, activates 1600 voice (best if broken into six 8 char chunks).\n");
// printf (" -S M17 Packet Encoder SMS String: No more than 772 chars, use single quotations (see example above).\n");
// printf (" -S M17 Stream Encoder SMS String: No more than 48 chars, activates 1600 voice (best if broken into six 8 char chunks).\n");
printf ("Decoder options:\n");
printf (" -fa Auto Detection\n");
printf (" -fA Passive Analog Audio Monitor\n");
@@ -1571,6 +1573,14 @@
printf (" \n");
printf (" -A <hex> Manually Enter and Enforce Anytone 16-bit BP Key Value (DMR) (Hex Value) \n");
printf (" \n");
printf (" -S <str> Manually Enter and Enforce Generic Static Keystream -> Length and BYTE PACKED / ALIGNED String for AMBE (up to 882 bits)\n");
printf (" For Example, enter 16-bit Keystream 0909 as:\n");
printf (" -S 16:0909\n");
printf (" For Example, enter 49-bit Keystream as:\n");
printf (" -S 49:123456789ABC80\n");
printf (" For Example, enter 49-bit Keystream (MBP 70) as:\n");
printf (" -S 49:ED0AED4AED4AED4A\n");
printf (" \n");
printf (" -k <file> Import Key List from csv file (Decimal Format) -- Lower Case 'k'.\n");
printf (" Only supports NXDN, DMR Basic Privacy (decimal value). \n");
printf (" (dPMR and Hytera 32/64 char not supported, DMR uses TG value as key id -- EXPERIMENTAL!!). \n");
@@ -1931,12 +1941,12 @@
state.m17dat[49] = '\0';
break;
//Specify M17 encoder SMS Message (truncates at 772)
case 'S':
strncpy(state.m17sms, optarg, 772);
state.m17sms[772] = '\0';
state.m17_str_dt = 3; //flip this so that STR encoder knows to use 1600 voice + data
break;
// //Specify M17 encoder SMS Message (truncates at 772)
// case 'S':
// strncpy(state.m17sms, optarg, 772);
// state.m17sms[772] = '\0';
// state.m17_str_dt = 3; //flip this so that STR encoder knows to use 1600 voice + data
// break;
//specify TG Hold value
case 'I':
@@ -1992,6 +2002,11 @@
case 'A':
anytone_bp_keystream_creation(&state, optarg);
break;
//Straight KS Generation
case 'S':
straight_mod_xor_keystream_creation(&state, optarg);
break;
case '3':
opts.dmr_le = 0;

20
src/dsd_mbe.c
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@@ -892,6 +892,16 @@ processMbeFrame (dsd_opts * opts, dsd_state * state, char imbe_fr[8][23], char a
ambe_d[i] ^= (uint8_t)(state->static_ks_bits[state->currentslot][(state->static_ks_counter[state->currentslot]++)%16] & 1); //Yikes!
}
//Generic Straight Static Keystream
if (state->straight_ks == 1)
{
//disable enc identifiers, if present
state->dmr_so = 0;
state->payload_algid = 0;
for (int i = 0; i < 49; i++)
ambe_d[i] ^= (uint8_t)(state->static_ks_bits[state->currentslot][(state->static_ks_counter[state->currentslot]++)%state->straight_mod] & 1); //Yikes!
}
mbe_processAmbe2450Dataf (state->audio_out_temp_buf, &state->errs, &state->errs2, state->err_str,
ambe_d, state->cur_mp, state->prev_mp, state->prev_mp_enhanced, opts->uvquality);
@@ -1257,6 +1267,16 @@ processMbeFrame (dsd_opts * opts, dsd_state * state, char imbe_fr[8][23], char a
ambe_d[i] ^= (uint8_t)(state->static_ks_bits[state->currentslot][(state->static_ks_counter[state->currentslot]++)%16] & 1); //Yikes!
}
//Generic Straight Static Keystream
if (state->straight_ks == 1)
{
//disable enc identifiers, if present
state->dmr_soR = 0;
state->payload_algidR = 0;
for (int i = 0; i < 49; i++)
ambe_d[i] ^= (uint8_t)(state->static_ks_bits[state->currentslot][(state->static_ks_counter[state->currentslot]++)%state->straight_mod] & 1); //Yikes!
}
mbe_processAmbe2450Dataf (state->audio_out_temp_bufR, &state->errsR, &state->errs2R, state->err_strR,
ambe_d, state->cur_mp2, state->prev_mp2, state->prev_mp_enhanced2, opts->uvquality);