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Optional decryption of communication using keystream

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This commit is contained in:
Pavel Zhovner 2016-03-09 02:41:20 +03:00
parent 799b2e2e9d
commit a78238349c
1 changed files with 54 additions and 15 deletions
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69
tools/mfkey/mfkey64.c
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@ -6,6 +6,7 @@
// Test-file: test2.c
#include "crapto1.h"
#include <stdio.h>
#include <string.h>
int main (int argc, char *argv[]) {
struct Crypto1State *revstate;
@ -21,32 +22,50 @@ int main (int argc, char *argv[]) {
printf("MIFARE Classic key recovery - based 64 bits of keystream\n");
printf("Recover key from only one complete authentication!\n\n");
if (argc < 6) {
printf(" syntax: %s <uid> <nt> <{nr}> <{ar}> <{at}>\n\n",argv[0]);
if (argc < 6 ) {
printf(" syntax: %s <uid> <nt> <{nr}> <{ar}> <{at}> <[enc]> [enc...]\n\n", argv[0]);
return 1;
}
sscanf(argv[1],"%x",&uid);
sscanf(argv[2],"%x",&nt);
sscanf(argv[3],"%x",&nr_enc);
sscanf(argv[4],"%x",&ar_enc);
sscanf(argv[5],"%x",&at_enc);
int encc = argc - 6;
int enclen[encc];
uint8_t enc[encc][120];
sscanf(argv[1], "%x", &uid);
sscanf(argv[2], "%x", &nt);
sscanf(argv[3], "%x", &nr_enc);
sscanf(argv[4], "%x", &ar_enc);
sscanf(argv[5], "%x", &at_enc);
for (int i = 0; i < encc; i++) {
enclen[i] = strlen(argv[i + 6]) / 2;
for (int i2 = 0; i2 < enclen[i]; i2++) {
sscanf(argv[i+6] + i2*2,"%2x", (uint8_t*)&enc[i][i2]);
}
}
printf("Recovering key for:\n");
printf(" uid: %08x\n",uid);
printf(" nt: %08x\n",nt);
printf(" {nr}: %08x\n",nr_enc);
printf(" {ar}: %08x\n",ar_enc);
printf(" {at}: %08x\n",at_enc);
/*
printf(" uid: %08x\n", uid);
printf(" nt: %08x\n", nt);
printf(" {nr}: %08x\n", nr_enc);
printf(" {ar}: %08x\n", ar_enc);
printf(" {at}: %08x\n", at_enc);
for (int i = 0; i < encc; i++) {
printf("{enc%d}: ", i);
for (int i2 = 0; i2 < enclen[i]; i2++) {
printf("%02x", enc[i][i2]);
}
printf("\n");
}
/*
uint32_t uid = 0x9c599b32;
uint32_t tag_challenge = 0x82a4166c;
uint32_t nr_enc = 0xa1e458ce;
uint32_t reader_response = 0x6eea41e0;
uint32_t tag_response = 0x5cadf439;
*/
// Generate lfsr succesors of the tag challenge
// Generate lfsr succesors of the tag challenge
printf("\nLFSR succesors of the tag challenge:\n");
printf(" nt': %08x\n",prng_successor(nt, 64));
printf(" nt'': %08x\n",prng_successor(nt, 96));
@ -59,6 +78,26 @@ int main (int argc, char *argv[]) {
printf(" ks3: %08x\n",ks3);
revstate = lfsr_recovery64(ks2, ks3);
// Decrypting communication using keystream if presented
if (argc > 6 ) {
printf("\nDecrypted communication:\n");
uint8_t ks4;
int rollb = 0;
for (int i = 0; i < encc; i++) {
printf("{dec%d}: ", i);
for (int i2 = 0; i2 < enclen[i]; i2++) {
ks4 = crypto1_byte(revstate, 0, 0);
printf("%02x", ks4 ^ enc[i][i2]);
rollb += 1;
}
printf("\n");
}
for (int i = 0; i < rollb; i++) {
lfsr_rollback_byte(revstate, 0, 0);
}
}
lfsr_rollback_word(revstate, 0, 0);
lfsr_rollback_word(revstate, 0, 0);
lfsr_rollback_word(revstate, nr_enc, 1);
@ -68,4 +107,4 @@ int main (int argc, char *argv[]) {
crypto1_destroy(revstate);
return 0;
}
}