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ADD: "analyse hid" - new function that implements the 'heart of darkn…
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…ess' hid/iclass permute function. Its converted from the php-solution found in the paper to C. Ref: https://github.com/akw0088/HID-Card-Copy/blob/master/key-permutation/permute.php
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@iceman1001
iceman1001 committed Nov 17, 2016
1 parent fa5974b commit 09bb01c
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Showing 2 changed files with 133 additions and 13 deletions.
144 changes: 131 additions & 13 deletions client/cmdanalyse.c
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Original file line number Diff line number Diff line change
Expand Up @@ -26,7 +26,6 @@ int usage_analyse_lcr(void) {
PrintAndLog("expected output: Target (BA) requires final LRC XOR byte value: 5A");
return 0;
}

int usage_analyse_checksum(void) {
PrintAndLog("The bytes will be added with eachother and than limited with the applied mask");
PrintAndLog("Finally compute ones' complement of the least significant bytes");
Expand All @@ -42,7 +41,6 @@ int usage_analyse_checksum(void) {
PrintAndLog("expected output: 0x61");
return 0;
}

int usage_analyse_crc(void){
PrintAndLog("A stub method to test different crc implementations inside the PM3 sourcecode. Just because you figured out the poly, doesn't mean you get the desired output");
PrintAndLog("");
Expand All @@ -55,6 +53,20 @@ int usage_analyse_crc(void){
PrintAndLog(" analyse crc 137AF00A0A0D");
return 0;
}
int usage_analyse_hid(void){
PrintAndLog("Permute function from 'heart of darkness' paper.");
PrintAndLog("");
PrintAndLog("Usage: analyse hid [h] <r|f> <bytes>");
PrintAndLog("Options:");
PrintAndLog(" h This help");
PrintAndLog(" r reverse permuted key");
PrintAndLog(" f permute key");
PrintAndLog(" <bytes> input bytes");
PrintAndLog("");
PrintAndLog("Samples:");
PrintAndLog(" analyse hid r 0123456789abcdef");
return 0;
}

static uint8_t calculateLRC( uint8_t* bytes, uint8_t len) {
uint8_t LRC = 0;
Expand Down Expand Up @@ -309,24 +321,129 @@ int CmdAnalyseTEASelfTest(const char *Cmd){
}

int CmdAnalyseA(const char *Cmd){
/*
piwi
// uid(2e086b1a) nt(230736f6) ks(0b0008000804000e) nr(000000000)
// uid(2e086b1a) nt(230736f6) ks(0e0b0e0b090c0d02) nr(000000001)
// uid(2e086b1a) nt(230736f6) ks(0e05060e01080b08) nr(000000002)
uint64_t d1[] = {0x2e086b1a, 0x230736f6, 0x0000001, 0x0e0b0e0b090c0d02};
uint64_t d2[] = {0x2e086b1a, 0x230736f6, 0x0000002, 0x0e05060e01080b08};
// uid(2e086b1a) nt(230736f6) par(0000000000000000) ks(0b0008000804000e) nr(000000000)
// uid(2e086b1a) nt(230736f6) par(0000000000000000) ks(0e0b0e0b090c0d02) nr(000000001)
// uid(2e086b1a) nt(230736f6) par(0000000000000000) ks(0e05060e01080b08) nr(000000002)
uint32_t uid = 0x2e086b1a, nt = 0x230736f6, nr = 0x000000001;
uint64_t ks_list = 0x0e0b0e0b090c0d02, r_key = 0;
// uid(17758822) nt(c0c69e59) ks(080105020705040e) nr(00000001)
// uid(17758822) nt(c0c69e59) ks(01070a05050c0705) nr(00000002)
uint64_t d1[] = {0x17758822, 0xc0c69e59, 0x0000001, 0x080105020705040e};
uint64_t d2[] = {0x17758822, 0xc0c69e59, 0x0000002, 0x01070a05050c0705};
// uid(6e442129) nt(8f699195) ks(090d0b0305020f02) nr(00000001)
// uid(6e442129) nt(8f699195) ks(03030508030b0c0e) nr(00000002)
// uid(6e442129) nt(8f699195) ks(02010f030c0d050d) nr(00000003)
// uid(6e442129) nt(8f699195) ks(00040f0f0305030e) nr(00000004)
uint64_t d1[] = {0x6e442129, 0x8f699195, 0x0000001, 0x090d0b0305020f02};
uint64_t d2[] = {0x6e442129, 0x8f699195, 0x0000004, 0x00040f0f0305030e};
uid(3e172b29) nt(039b7bd2) ks(0c0e0f0505080800) nr(00000001)
uid(3e172b29) nt(039b7bd2) ks(0e06090d03000b0f) nr(00000002)
*/
uint64_t key = 0;
uint64_t d1[] = {0x3e172b29, 0x039b7bd2, 0x0000001, 0x0c0e0f0505080800};
uint64_t d2[] = {0x3e172b29, 0x039b7bd2, 0x0000002, 0x0e06090d03000b0f};

nonce2key_ex(0, 0 , d1[0], d1[1], d1[2], d1[3], &key);
nonce2key_ex(0, 0 , d2[0], d2[1], d2[2], d2[3], &key);
return 0;
}

nonce2key_ex(0, 0 , uid, nt, nr, ks_list, &r_key);
static void permute(uint8_t *data, uint8_t len, uint8_t *output){
#define KEY_SIZE 8

nr = 0x000000002;
ks_list = 0x0e05060e01080b08;
nonce2key_ex(0, 0 , uid, nt, nr, ks_list, &r_key);
if ( len > KEY_SIZE ) {
for(uint8_t m = 0; m < len; m += KEY_SIZE){
permute(data+m, KEY_SIZE, output+m);
}
return;
}
if ( len != KEY_SIZE ) {
printf("wrong key size\n");
return;
}
uint8_t i,j,p, mask;
for( i=0; i < KEY_SIZE; ++i){
p = 0;
mask = 0x80 >> i;
for( j=0; j < KEY_SIZE; ++j){
p >>= 1;
if (data[j] & mask)
p |= 0x80;
}
output[i] = p;
}
}
static void permute_rev(uint8_t *data, uint8_t len, uint8_t *output){
permute(data, len, output);
permute(output, len, data);
permute(data, len, output);
}
static void simple_crc(uint8_t *data, uint8_t len, uint8_t *output){
uint8_t crc = 0;
for( uint8_t i=0; i < len; ++i){
// seventh byte contains the crc.
if ( (i & 0x7) == 0x7 ) {
output[i] = crc ^ 0xFF;
crc = 0;
} else {
output[i] = data[i];
crc ^= data[i];
}
}
}
// DES doesn't use the MSB.
static void shave(uint8_t *data, uint8_t len){
for (uint8_t i=0; i<len; ++i)
data[i] &= 0xFE;
}
static void generate_rev(uint8_t *data, uint8_t len) {
uint8_t *key = calloc(len,1);
printf("input permuted key | %s \n", sprint_hex(data, len));
permute_rev(data, len, key);
printf(" unpermuted key | %s \n", sprint_hex(key, len));
shave(key, len);
printf(" key | %s \n", sprint_hex(key, len));
free(key);
}
static void generate(uint8_t *data, uint8_t len) {
uint8_t *key = calloc(len,1);
uint8_t *pkey = calloc(len,1);
printf(" input key | %s \n", sprint_hex(data, len));
permute(data, len, pkey);
printf(" permuted key | %s \n", sprint_hex(pkey, len));
simple_crc(pkey, len, key );
printf(" CRC'ed key | %s \n", sprint_hex(key, len));
free(key);
free(pkey);
}
int CmdAnalyseHid(const char *Cmd){

printf("Found valid key: %012"llx" \n", r_key);
uint8_t data[16] = {0};
bool isReverse = FALSE;
int len = 0;
char cmdp = param_getchar(Cmd, 0);
if (strlen(Cmd) == 0|| cmdp == 'h' || cmdp == 'H') return usage_analyse_hid();

if ( cmdp == 'r' || cmdp == 'R' )
isReverse = TRUE;

param_gethex_ex(Cmd, 1, data, &len);
if ( len%2 ) return usage_analyse_hid();

len >>= 1;

if ( isReverse )
generate_rev(data, len);
else
generate(data, len);
return 0;
}


static command_t CommandTable[] = {
{"help", CmdHelp, 1, "This help"},
{"lcr", CmdAnalyseLCR, 1, "Generate final byte for XOR LRC"},
Expand All @@ -336,6 +453,7 @@ static command_t CommandTable[] = {
{"tea", CmdAnalyseTEASelfTest, 1, "Crypto TEA test"},
{"lfsr", CmdAnalyseLfsr, 1, "LFSR tests"},
{"a", CmdAnalyseA, 1, "num bits test"},
{"hid", CmdAnalyseHid, 1, "Permute function from 'heart of darkness' paper"},
{NULL, NULL, 0, NULL}
};

Expand Down
2 changes: 2 additions & 0 deletions client/cmdanalyse.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -25,6 +25,7 @@
int usage_analyse_lcr(void);
int usage_analyse_checksum(void);
int usage_analyse_crc(void);
int usage_analyse_hid(void);

int CmdAnalyse(const char *Cmd);
int CmdAnalyseLCR(const char *Cmd);
Expand All @@ -33,4 +34,5 @@ int CmdAnalyseDates(const char *Cmd);
int CmdAnalyseCRC(const char *Cmd);
int CmdAnalyseTEASelfTest(const char *Cmd);
int CmdAnalyseLfsr(const char *Cmd);
int CmdAnalyseHid(const char *Cmd);
#endif

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