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DMR TYT EP (AES128) Encryption Mode; #302

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Above Commit is by Anonymous Submission;
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lwvmobile
2025-08-15 20:29:34 -04:00
parent 8f092e293f
commit 41865f3af7
2 changed files with 49 additions and 19 deletions
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49
src/dsd_main.c
View File

@@ -1580,13 +1580,14 @@
printf (" \n");
printf (" -2 <hex> Manually Enter TYT and Enforce 16-bit BP Key Value (DMR) (Hex Value) \n");
printf (" \n");
printf (" -! <hex> Manually Enter TYT and Enforce Advanced Privacy AP Hex Key (see example below)\n");
printf (" -! <hex> Manually Enter TYT and Enforce Advanced Privacy (PC4) AP Hex Key (see example below)\n");
printf (" Encapulate in Single Quotation Marks; Space every 16 chars.\n");
printf (" -! '736B9A9C5645288B 243AD5CB8701EF8A' \n");
printf (" \n");
printf (" -5 <hex> Manually Enter TYT and Enforce Enhanced Privacy EP Hex Key (see example below)\n");
printf (" -5 <hex> Manually Enter TYT and Enforce Enhanced Privacy (AES-128) EP Hex Key (see example below)\n");
printf (" Encapulate in Single Quotation Marks; Space every 16 chars.\n");
printf (" -! '736B9A9C5645288B 243AD5CB8701EF8A' \n");
printf (" -5 '736B9A9C5645288B 243AD5CB8701EF8A' \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");
@@ -1975,21 +1976,57 @@
state.tyt_bp = 1;
sscanf (optarg, "%llX", &state.H);
state.H = state.H & 0xFFFF; //truncate to 16-bits
fprintf (stderr,"DMR TYT 16-bit Key 0x%llX with Forced Application\n", state.H);
fprintf (stderr,"DMR TYT Basic 16-bit Key 0x%llX with Forced Application\n", state.H);
break;
//get user TYT AP Key and Force Its application
case '!':
tyt_ap_init();
state.tyt_ap = 1;
fprintf (stderr,"DMR TYT AP 128-bit Key with Forced Application\n");
fprintf (stderr,"DMR TYT AP (PC4) 128-bit Key with Forced Application\n");
break;
//get user TYT EP Key and Force Its application
case '5':
//TODO: This, or combine with above with -! AP:KEY or EP:KEY (or similar)
strncpy(opts.szNumbers, optarg, 1023);
opts.szNumbers[1023] = '\0';
unsigned long long int K1 = strtoull (opts.szNumbers, &pEnd, 16);
unsigned long long int K2 = strtoull (pEnd, &pEnd, 16);
uint8_t key[32];
memset(key, 0, sizeof(key));
//static key value
key[0]=0x6e; key[1]=0x02; key[2]=0x8d; key[3]=0x8a;
key[4]=0xca; key[5]=0xeb; key[6]=0x9b; key[7]=0xbe;
key[8]=0x42; key[9]=0x72; key[10]=0xfb; key[11]=0x82;
key[12]=0x64; key[13]=0x56; key[14]=0x31; key[15]=0xfa;
//iv or input register is the key value provided by user
uint8_t iv[16];
memset(iv, 0, sizeof(iv));
//Load user key into iv / input register
for (int i = 0; i < 8; i++)
{
iv[i+0] = (K1 >> (56-(i*8))) & 0xFF;
iv[i+8] = (K2 >> (56-(i*8))) & 0xFF;
}
uint8_t ks_bytes[16];
memset(ks_bytes, 0, sizeof(ks_bytes));
//create keystream
aes_ofb_keystream_output(iv, key, ks_bytes, 0, 1);
uint8_t ks_bits[128];
memset(ks_bits, 0, sizeof(ks_bits));
unpack_byte_array_into_bit_array(ks_bytes, ks_bits, 16);
//load static keystream into ctx.bits since that isn't ever zeroed out
for (int i = 0; i < 49; i++)
ctx.bits[i] = ks_bits[i];
fprintf (stderr,"DMR TYT EP (AES-128) Key %016llX %016llX with Forced Application\n", K1, K2);
state.tyt_ep = 1;
fprintf (stderr,"DMR TYT EP Key with Forced Application\n");
break;
case '3':

19
src/dsd_mbe.c
View File

@@ -812,8 +812,8 @@ processMbeFrame (dsd_opts * opts, dsd_state * state, char imbe_fr[8][23], char a
}
//DMR TYT AP, Slot 1
if (state->currentslot == 0 && state->tyt_ap == 1)
//DMR TYT AP, Either Slot (static single key'd enforced KS)
if (state->tyt_ap == 1)
{
short frame1_cipher[49];
@@ -825,19 +825,12 @@ processMbeFrame (dsd_opts * opts, dsd_state * state, char imbe_fr[8][23], char a
}
//DMR TYT AP, Slot 2
if (state->currentslot == 1 && state->tyt_ap == 1)
//DMR TYT EP, Either Slot (static single key'd enforced KS)
if (state->tyt_ep == 1)
{
short frame1_cipher[49];
for (int i = 0; i < 49; i++) frame1_cipher[i] = ambe_d[i];
decrypt_frame_49(frame1_cipher);
memset (ambe_d, 0, 49*sizeof(char));
for (int i = 0; i < 49; i++) ambe_d[i] = ctx.bits[i];
for (int i = 0; i < 49; i++)
ambe_d[i] ^= (uint8_t)(ctx.bits[i] & 1);
}
//P25p2 RC4 Handling, VCH 0
if (state->currentslot == 0 && state->payload_algid == 0xAA && state->R != 0 && ((state->synctype == 35) || (state->synctype == 36)))