mirror of
https://github.com/RfidResearchGroup/proxmark3.git
synced 2025-08-14 18:48:13 -07:00
added "lf hitag crack2" to support the second attack vector against Hitag2, based on all work from @kevsecurity Kev Sheldrake in the RFIDler repo. This is WIP, not working at the moment
This commit is contained in:
iceman1001
parent
f71c9a5e59
commit
dee84b5b6f
5 changed files with 332 additions and 39 deletions
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@ -28,6 +28,7 @@
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#include "string.h"
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#include "BigBuf.h"
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#include "cmd.h"
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#include "lfadc.h"
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const static uint8_t ERROR_RESPONSE[] = { 0xF4, 0x02, 0x88, 0x9C };
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@ -48,20 +49,18 @@ static void hitag2crack_xor(uint8_t *target, const uint8_t *source, const uint8_
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// nrar is the 64 bit binarray of the nR aR pair;
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// cmd is the binarray of the encrypted command to send;
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// len is the length of the encrypted command.
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static bool hitag2crack_send_e_cmd(uint8_t *resp, uint8_t *nrar, uint8_t *cmd, int len) {
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static bool hitag2crack_send_e_cmd(uint8_t *resp, uint8_t *nrar, uint8_t *cmd, size_t len) {
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memset(resp, 0, 4);
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// Get UID
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uint8_t uid[4];
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if (ht2_read_uid(uid, false, false, true) != PM3_SUCCESS) {
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if (ht2_read_uid(NULL, true, false, true) != PM3_SUCCESS) {
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return false;
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}
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// send nrar and receive (useless) encrypted page 3 value
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uint8_t e_page3[4];
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size_t n = 0;
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if (ht2_tx_rx(nrar, 64, e_page3, &n, true, true) != PM3_SUCCESS) {
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if (ht2_tx_rx(nrar, 64, NULL, &n, true, true) != PM3_SUCCESS) {
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return false;
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}
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@ -146,12 +145,12 @@ static bool hitag2crack_read_page(uint8_t *resp, uint8_t pagenum, uint8_t *nrar,
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// e_uid is the binarray of the encrypted version of the UID.
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static bool hitag2crack_test_e_p0cmd(uint8_t *keybits, uint8_t *nrar, uint8_t *e_cmd, uint8_t *uid, uint8_t *e_uid) {
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uint8_t cipherbits[42];
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uint8_t cipherbits[42] = {0};
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memcpy(cipherbits, e_cmd, 10); // copy encrypted cmd to cipherbits
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memcpy(cipherbits + 10, e_uid, 32); // copy encrypted uid to cipherbits
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uint8_t plainbits[42];
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uint8_t plainbits[42] = {0};
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memcpy(plainbits, read_p0_cmd, sizeof(read_p0_cmd)); // copy cmd to plainbits
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memcpy(plainbits + 10, uid, 32); // copy uid to plainbits
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@ -159,23 +158,23 @@ static bool hitag2crack_test_e_p0cmd(uint8_t *keybits, uint8_t *nrar, uint8_t *e
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hitag2crack_xor(keybits, plainbits, cipherbits, 42);
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// create extended cmd -> 4 * READP0CMD = 40 bits
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uint8_t ext_cmd[40];
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memcpy(ext_cmd, read_p0_cmd, sizeof(read_p0_cmd));
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memcpy(ext_cmd + 10, read_p0_cmd, sizeof(read_p0_cmd));
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memcpy(ext_cmd + 20, read_p0_cmd, sizeof(read_p0_cmd));
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memcpy(ext_cmd + 30, read_p0_cmd, sizeof(read_p0_cmd));
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// xor extended cmd with keybits
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uint8_t e_ext_cmd[40];
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hitag2crack_xor(e_ext_cmd, ext_cmd, keybits, 40);
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uint8_t e_ext_cmd[40] = {0};
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hitag2crack_xor(e_ext_cmd, read_p0_cmd, keybits, 10);
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hitag2crack_xor(e_ext_cmd + 10, read_p0_cmd, keybits + 10, 10);
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hitag2crack_xor(e_ext_cmd + 20, read_p0_cmd, keybits + 20, 10);
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hitag2crack_xor(e_ext_cmd + 30, read_p0_cmd, keybits + 30, 10);
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// send extended encrypted cmd
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uint8_t resp[4];
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uint8_t resp[4] = {0};
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if (hitag2crack_send_e_cmd(resp, nrar, e_ext_cmd, 40)) {
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// test if it was valid
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if (memcmp(resp, ERROR_RESPONSE, 4)) {
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return true;
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} else {
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DbpString("test enc-page0 cmd. got error-response");
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Dbhexdump(4, resp, false);
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}
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}
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return false;
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@ -230,6 +229,7 @@ static bool hitag2crack_find_e_page0_cmd(uint8_t *keybits, uint8_t *e_firstcmd,
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if (memcmp(resp, ERROR_RESPONSE, 4)) {
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// convert response to binarray
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// response should been encrypted UID
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uint8_t e_uid[32];
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hex2binarray((char *)e_uid, (char *)resp);
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@ -296,11 +296,115 @@ static bool hitag2crack_find_valid_e_cmd(uint8_t *e_cmd, uint8_t *nrar) {
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return false;
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}
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typedef struct {
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uint8_t keybits[2080];
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uint8_t uid[32];
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uint8_t nrar[64];
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uint8_t e_ext_cmd[2080];
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uint8_t ext_cmd[2080];
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} PACKED lf_hitag_crack2_t;
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// hitag2crack_consume_keystream sends an extended command (up to 510 bits in
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// length) to consume keystream.
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// keybits is the binarray of keystream bits;
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// kslen is the length of keystream;
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// ksoffset is a pointer to the current keystream offset (updated by this fn);
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// nrar is the 64 bit binarray of the nR aR pair.
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//static bool ht2crack_consume_keystream(uint8_t *keybits, int kslen, int *ksoffset) {
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static bool ht2crack_consume_keystream(lf_hitag_crack2_t *c2, int kslen, int *ksoffset) {
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// calculate the length of keybits to consume with the extended command.
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// 42 = 32 bit response + 10 bit command reserved for next command. conlen
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// cannot be longer than 510 bits to fit into the small RWD buffer.
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int conlen = kslen - *ksoffset - 42;
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if (conlen < 10) {
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DbpString("ht2crack_consume_keystream: conlen < 10");
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return false;
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}
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// calculate how many repeated commands to send in this extended command.
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int numcmds = conlen / 10;
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// xor extended cmd with keybits
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hitag2crack_xor(c2->e_ext_cmd, c2->ext_cmd, c2->keybits + *ksoffset, (numcmds * 10));
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// send encrypted command
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size_t n = 0;
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uint8_t resp[4];
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if (ht2_tx_rx(c2->e_ext_cmd, numcmds * 10, resp, &n, true, true) != PM3_SUCCESS) {
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Dbprintf("ht2crack_consume_keystream: tx/rx cmd failed, got %zu", n);
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return false;
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}
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// test response
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if (memcmp(resp, ERROR_RESPONSE, 4) == 0) {
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DbpString("ht2crack_consume_keystream: got error response from card");
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return false;
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}
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// dont bother decrypting the response - we already know the keybits
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// update ksoffset with command length and response
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*ksoffset += (numcmds * 10) + 32;
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return true;
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}
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// hitag2crack_extend_keystream sends an extended command to retrieve more keybits.
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// keybits is the binarray of the keystream bits;
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// kslen is a pointer to the current keybits length;
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// ksoffset is the offset into the keybits array;
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// nrar is the 64 bit binarray of the nR aR pair;
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// uid is the 32 bit binarray of the UID.
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//static bool ht2crack_extend_keystream(uint8_t *keybits, int *kslen, int ksoffset, uint8_t *nrar, uint8_t *uid) {
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static bool ht2crack_extend_keystream(lf_hitag_crack2_t *c2, int *kslen, int ksoffset) {
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// calc number of command iterations to send
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int cmdlen = *kslen - ksoffset;
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if (cmdlen < 10) {
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DbpString("extend_keystream: cmdlen < 10");
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return false;
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}
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int numcmds = cmdlen / 10;
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// xor extended cmd with keybits
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hitag2crack_xor(c2->e_ext_cmd, c2->ext_cmd, c2->keybits + ksoffset, numcmds * 10);
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// send extended encrypted cmd
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size_t n = 0;
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uint8_t resp[4];
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if (ht2_tx_rx(c2->e_ext_cmd, numcmds * 10, resp, &n, true, true) != PM3_SUCCESS) {
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DbpString("extend_keystream: tx/rx cmd failed");
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Dbhexdump(numcmds * 10, c2->e_ext_cmd, false);
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return false;
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}
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// test response
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if (memcmp(resp, ERROR_RESPONSE, 4) == 0) {
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return false;
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}
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// convert response to binarray
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uint8_t e_response[32];
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hex2binarray((char*)e_response, (char*)resp);
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// recover keystream from encrypted response
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hitag2crack_xor(c2->keybits + ksoffset + (numcmds * 10), e_response, c2->uid, 32);
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// update kslen
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*kslen = ksoffset + (numcmds * 10) + 32;
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return true;
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}
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// hitag2_crack implements the first crack algorithm described in the paper,
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// Gone In 360 Seconds by Verdult, Garcia and Balasch.
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// response is a multi-line text response containing the 8 pages of the cracked tag
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// nrarhex is a string containing hex representations of the 32 bit nR and aR values
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void ht2_crack(uint8_t *nrar_hex) {
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void ht2_crack1(uint8_t *nrar_hex) {
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clear_trace();
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@ -340,7 +444,6 @@ void ht2_crack(uint8_t *nrar_hex) {
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res = PM3_EFAILED;
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goto out;
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}
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// read all pages using key stream
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for (uint8_t i = 1; i < 8; i++) {
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hitag2crack_read_page(packet.data + (i * 4), i, nrar, keybits);
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@ -354,3 +457,121 @@ void ht2_crack(uint8_t *nrar_hex) {
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out:
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reply_ng(CMD_LF_HITAG2_CRACK, res, (uint8_t *)&packet, sizeof(lf_hitag_crack_response_t));
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}
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// hitag2_keystream uses the first crack algorithm described in the paper,
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// Gone In 360 Seconds by Verdult, Garcia and Balasch, to retrieve 2048 bits of keystream.
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// response is a multi-line text response containing the hex of the keystream;
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// nrar_hex is the 32 bit nR and aR in hex
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void ht2_crack2(uint8_t *nrar_hex) {
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lf_hitag_crack2_t *c2 = (lf_hitag_crack2_t*)BigBuf_calloc(sizeof(lf_hitag_crack2_t));
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lf_hitag_crack_response_t *packet = (lf_hitag_crack_response_t*)BigBuf_calloc(sizeof(lf_hitag_crack_response_t));
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g_logging = false;
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LEDsoff();
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set_tracing(false);
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clear_trace();
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int res = PM3_SUCCESS;
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// find the 'read page 0' command and recover key stream
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// get uid as hexstring
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uint8_t uid_hex[4];
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if (ht2_read_uid(uid_hex, false, false, false) != PM3_SUCCESS) {
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res = PM3_EFAILED;
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goto out;
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}
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hex2binarray_n((char *)c2->uid, (char *)uid_hex, 4);
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hex2binarray_n((char *)c2->nrar, (char *)nrar_hex, 8);
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// find a valid encrypted command
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uint8_t e_firstcmd[10];
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if (hitag2crack_find_valid_e_cmd(e_firstcmd, c2->nrar) == false) {
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res = PM3_EFAILED;
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goto out;
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}
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if (hitag2crack_find_e_page0_cmd(c2->keybits, e_firstcmd, c2->nrar, c2->uid) == false) {
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res = PM3_EFAILED;
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goto out;
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}
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// Now we got 40 bits of keystream in c2->keybits.
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// using the 40 bits of keystream in keybits, sending commands with ever
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// increasing lengths to acquire 2048 bits of key stream.
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int kslen = 40;
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// build extended command
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for (int i = 0; i < 208 ; i++) {
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memcpy(c2->ext_cmd + (i * 10), read_p0_cmd, 10);
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}
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while (kslen < 2048) {
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int ksoffset = 0;
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// Get UID
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if (ht2_read_uid(NULL, true, false, true) != PM3_SUCCESS) {
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res = PM3_EFAILED;
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goto out;
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}
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// send nrar and receive (useless) encrypted page 3 value
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size_t n = 0;
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if (ht2_tx_rx(c2->nrar, 64, NULL, &n, true, true) != PM3_SUCCESS) {
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res = PM3_EFAILED;
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goto out;
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}
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// while we have at least 52 bits of keystream, consume it with
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// extended read page 0 commands.
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// 52 = 10 (min command len) + 32 (response) + 10 (min command len we'll send)
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while ((kslen - ksoffset) >= 52) {
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// consume the keystream, updating ksoffset as we go
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//if (ht2crack_consume_keystream(c2->keybits, kslen, &ksoffset, c2->nrar) == false) {
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if (ht2crack_consume_keystream(c2, kslen, &ksoffset) == false) {
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DbpString("ht2crack_consume_keystream failed");
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res = PM3_EFAILED;
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goto out;
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}
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}
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// send an extended command to retrieve more keystream,
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// updating kslen as we go
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if (ht2crack_extend_keystream(c2, &kslen, ksoffset) == false) {
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DbpString("ht2crack_extend_keystream failed");
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res = PM3_EFAILED;
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goto out;
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}
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Dbprintf("Recovered " _YELLOW_("%i") " bits of keystream", kslen);
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}
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uint8_t *keybitshex = BigBuf_calloc(64);
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for (int i = 0; i < 2048; i += 256) {
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binarray2hex(c2->keybits + i, 256, keybitshex);
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Dbhexdump(256, keybitshex, false);
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}
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BigBuf_free();
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// copy UID since we already have it...
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memcpy(packet->data, uid_hex, 4);
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packet->status = 1;
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out:
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/*
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DbpString("keybits:");
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Dbhexdump(2080, c2->keybits, false);
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DbpString("uid:");
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Dbhexdump(32, c2->uid, false);
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DbpString("nrar:");
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Dbhexdump(64, c2->nrar, false);
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*/
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reply_ng(CMD_LF_HITAG2_CRACK_2, res, (uint8_t *)packet, sizeof(lf_hitag_crack_response_t));
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}
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