--- /dev/null
+/*****************************************************************************
+ * This file is part of iClassCipher. It is a reconstructon of the cipher engine
+ * used in iClass, and RFID techology.
+ *
+ * The implementation is based on the work performed by
+ * Flavio D. Garcia, Gerhard de Koning Gans, Roel Verdult and
+ * Milosch Meriac in the paper "Dismantling IClass".
+ *
+ * This is a reference implementation of iclass key diversification. I'm sure it can be
+ * optimized heavily. It is written for ease of understanding and correctness, please take it
+ * and tweak it and make a super fast version instead, using this for testing and verification.
+
+ * Copyright (C) 2014 Martin Holst Swende
+ *
+ * This is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ *
+ * This file is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with IClassCipher. If not, see <http://www.gnu.org/licenses/>.
+ ****************************************************************************/
+/**
+
+
+From "Dismantling iclass":
+ This section describes in detail the built-in key diversification algorithm of iClass.
+ Besides the obvious purpose of deriving a card key from a master key, this
+ algorithm intends to circumvent weaknesses in the cipher by preventing the
+ usage of certain ‘weak’ keys. In order to compute a diversified key, the iClass
+ reader first encrypts the card identity id with the master key K, using single
+ DES. The resulting ciphertext is then input to a function called hash0 which
+ outputs the diversified key k.
+
+ k = hash0(DES enc (id, K))
+
+ Here the DES encryption of id with master key K outputs a cryptogram c
+ of 64 bits. These 64 bits are divided as c = x, y, z [0] , . . . , z [7] ∈ F 82 × F 82 × (F 62 ) 8
+ which is used as input to the hash0 function. This function introduces some
+ obfuscation by performing a number of permutations, complement and modulo
+ operations, see Figure 2.5. Besides that, it checks for and removes patterns like
+ similar key bytes, which could produce a strong bias in the cipher. Finally, the
+ output of hash0 is the diversified card key k = k [0] , . . . , k [7] ∈ (F 82 ) 8 .
+
+
+**/
+
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <string.h>
+#include <stdio.h>
+#include <inttypes.h>
+#include "fileutils.h"
+#include "cipherutils.h"
+#include "des.h"
+
+uint8_t pi[35] = {0x0F,0x17,0x1B,0x1D,0x1E,0x27,0x2B,0x2D,0x2E,0x33,0x35,0x39,0x36,0x3A,0x3C,0x47,0x4B,0x4D,0x4E,0x53,0x55,0x56,0x59,0x5A,0x5C,0x63,0x65,0x66,0x69,0x6A,0x6C,0x71,0x72,0x74,0x78};
+
+static des_context ctx_enc = {DES_ENCRYPT,{0}};
+static des_context ctx_dec = {DES_DECRYPT,{0}};
+
+static int debug_print = 0;
+
+/**
+ * @brief The key diversification algorithm uses 6-bit bytes.
+ * This implementation uses 64 bit uint to pack seven of them into one
+ * variable. When they are there, they are placed as follows:
+ * XXXX XXXX N0 .... N7, occupying the lsat 48 bits.
+ *
+ * This function picks out one from such a collection
+ * @param all
+ * @param n bitnumber
+ * @return
+ */
+uint8_t getSixBitByte(uint64_t c, int n)
+{
+ return (c >> (42-6*n)) & 0x3F;
+}
+
+/**
+ * @brief Puts back a six-bit 'byte' into a uint64_t.
+ * @param c buffer
+ * @param z the value to place there
+ * @param n bitnumber.
+ */
+void pushbackSixBitByte(uint64_t *c, uint8_t z, int n)
+{
+ //0x XXXX YYYY ZZZZ ZZZZ ZZZZ
+ // ^z0 ^z7
+ //z0: 1111 1100 0000 0000
+
+ uint64_t masked = z & 0x3F;
+ uint64_t eraser = 0x3F;
+ masked <<= 42-6*n;
+ eraser <<= 42-6*n;
+
+ //masked <<= 6*n;
+ //eraser <<= 6*n;
+
+ eraser = ~eraser;
+ (*c) &= eraser;
+ (*c) |= masked;
+
+}
+/**
+ * @brief Swaps the z-values.
+ * If the input value has format XYZ0Z1...Z7, the output will have the format
+ * XYZ7Z6...Z0 instead
+ * @param c
+ * @return
+ */
+uint64_t swapZvalues(uint64_t c)
+{
+ uint64_t newz = 0;
+ pushbackSixBitByte(&newz, getSixBitByte(c,0),7);
+ pushbackSixBitByte(&newz, getSixBitByte(c,1),6);
+ pushbackSixBitByte(&newz, getSixBitByte(c,2),5);
+ pushbackSixBitByte(&newz, getSixBitByte(c,3),4);
+ pushbackSixBitByte(&newz, getSixBitByte(c,4),3);
+ pushbackSixBitByte(&newz, getSixBitByte(c,5),2);
+ pushbackSixBitByte(&newz, getSixBitByte(c,6),1);
+ pushbackSixBitByte(&newz, getSixBitByte(c,7),0);
+ newz |= (c & 0xFFFF000000000000);
+ return newz;
+}
+
+/**
+* @return 4 six-bit bytes chunked into a uint64_t,as 00..00a0a1a2a3
+*/
+uint64_t ck(int i, int j, uint64_t z)
+{
+
+ if(i == 1 && j == -1)
+ {
+ // ck(1, −1, z [0] . . . z [3] ) = z [0] . . . z [3]
+ return z;
+
+ }else if( j == -1)
+ {
+ // ck(i, −1, z [0] . . . z [3] ) = ck(i − 1, i − 2, z [0] . . . z [3] )
+ return ck(i-1,i-2, z);
+ }
+
+ if(getSixBitByte(z,i) == getSixBitByte(z,j))
+ {
+
+ //ck(i, j − 1, z [0] . . . z [i] ← j . . . z [3] )
+ uint64_t newz = 0;
+ int c;
+ for(c = 0; c < 4 ;c++)
+ {
+ uint8_t val = getSixBitByte(z,c);
+ if(c == i)
+ {
+ pushbackSixBitByte(&newz, j, c);
+ }else
+ {
+ pushbackSixBitByte(&newz, val, c);
+ }
+ }
+ return ck(i,j-1,newz);
+ }else
+ {
+ return ck(i,j-1,z);
+ }
+}
+/**
+
+ Definition 8.
+ Let the function check : (F 62 ) 8 → (F 62 ) 8 be defined as
+ check(z [0] . . . z [7] ) = ck(3, 2, z [0] . . . z [3] ) · ck(3, 2, z [4] . . . z [7] )
+
+ where ck : N × N × (F 62 ) 4 → (F 62 ) 4 is defined as
+
+ ck(1, −1, z [0] . . . z [3] ) = z [0] . . . z [3]
+ ck(i, −1, z [0] . . . z [3] ) = ck(i − 1, i − 2, z [0] . . . z [3] )
+ ck(i, j, z [0] . . . z [3] ) =
+ ck(i, j − 1, z [0] . . . z [i] ← j . . . z [3] ), if z [i] = z [j] ;
+ ck(i, j − 1, z [0] . . . z [3] ), otherwise
+
+ otherwise.
+**/
+
+uint64_t check(uint64_t z)
+{
+ //These 64 bits are divided as c = x, y, z [0] , . . . , z [7]
+
+ // ck(3, 2, z [0] . . . z [3] )
+ uint64_t ck1 = ck(3,2, z );
+
+ // ck(3, 2, z [4] . . . z [7] )
+ uint64_t ck2 = ck(3,2, z << 24);
+
+ //The ck function will place the values
+ // in the middle of z.
+ ck1 &= 0x00000000FFFFFF000000;
+ ck2 &= 0x00000000FFFFFF000000;
+
+ return ck1 | ck2 >> 24;
+
+}
+
+void permute(BitstreamIn *p_in, uint64_t z,int l,int r, BitstreamOut* out)
+{
+ if(bitsLeft(p_in) == 0)
+ {
+ return;
+ }
+ bool pn = tailBit(p_in);
+ if( pn ) // pn = 1
+ {
+ uint8_t zl = getSixBitByte(z,l);
+
+ push6bits(out, zl+1);
+ permute(p_in, z, l+1,r, out);
+ }else // otherwise
+ {
+ uint8_t zr = getSixBitByte(z,r);
+
+ push6bits(out, zr);
+ permute(p_in,z,l,r+1,out);
+ }
+}
+void printbegin()
+{
+ if(debug_print <2)
+ return ;
+
+ prnlog(" | x| y|z0|z1|z2|z3|z4|z5|z6|z7|");
+}
+
+void printState(char* desc, uint64_t c)
+{
+ if(debug_print < 2)
+ return ;
+
+ printf("%s : ", desc);
+ uint8_t x = (c & 0xFF00000000000000 ) >> 56;
+ uint8_t y = (c & 0x00FF000000000000 ) >> 48;
+ printf(" %02x %02x", x,y);
+ int i ;
+ for(i =0 ; i < 8 ; i++)
+ {
+ printf(" %02x", getSixBitByte(c,i));
+ }
+ printf("\n");
+}
+
+/**
+ * @brief
+ *Definition 11. Let the function hash0 : F 82 × F 82 × (F 62 ) 8 → (F 82 ) 8 be defined as
+ * hash0(x, y, z [0] . . . z [7] ) = k [0] . . . k [7] where
+ * z'[i] = (z[i] mod (63-i)) + i i = 0...3
+ * z'[i+4] = (z[i+4] mod (64-i)) + i i = 0...3
+ * ẑ = check(z');
+ * @param c
+ * @param k this is where the diversified key is put (should be 8 bytes)
+ * @return
+ */
+void hash0(uint64_t c, uint8_t k[8])
+{
+ c = swapZvalues(c);
+
+ printbegin();
+ printState("origin",c);
+ //These 64 bits are divided as c = x, y, z [0] , . . . , z [7]
+ // x = 8 bits
+ // y = 8 bits
+ // z0-z7 6 bits each : 48 bits
+ uint8_t x = (c & 0xFF00000000000000 ) >> 56;
+ uint8_t y = (c & 0x00FF000000000000 ) >> 48;
+ int n;
+ uint8_t zn, zn4, _zn, _zn4;
+ uint64_t zP = 0;
+
+ for(n = 0; n < 4 ; n++)
+ {
+ zn = getSixBitByte(c,n);
+
+ zn4 = getSixBitByte(c,n+4);
+
+ _zn = (zn % (63-n)) + n;
+ _zn4 = (zn4 % (64-n)) + n;
+
+
+ pushbackSixBitByte(&zP, _zn,n);
+ pushbackSixBitByte(&zP, _zn4,n+4);
+
+ }
+ printState("0|0|z'",zP);
+
+ uint64_t zCaret = check(zP);
+ printState("0|0|z^",zP);
+
+
+ uint8_t p = pi[x % 35];
+
+ if(x & 1) //Check if x7 is 1
+ {
+ p = ~p;
+ }
+
+ if(debug_print >= 2) prnlog("p:%02x", p);
+
+ BitstreamIn p_in = { &p, 8,0 };
+ uint8_t outbuffer[] = {0,0,0,0,0,0,0,0};
+ BitstreamOut out = {outbuffer,0,0};
+ permute(&p_in,zCaret,0,4,&out);//returns 48 bits? or 6 8-bytes
+
+ //Out is now a buffer containing six-bit bytes, should be 48 bits
+ // if all went well
+ //Shift z-values down onto the lower segment
+
+ uint64_t zTilde = x_bytes_to_num(outbuffer,8);
+
+ zTilde >>= 16;
+
+ printState("0|0|z~", zTilde);
+
+ int i;
+ int zerocounter =0 ;
+ for(i =0 ; i < 8 ; i++)
+ {
+
+ // the key on index i is first a bit from y
+ // then six bits from z,
+ // then a bit from p
+
+ // Init with zeroes
+ k[i] = 0;
+ // First, place yi leftmost in k
+ //k[i] |= (y << i) & 0x80 ;
+
+ // First, place y(7-i) leftmost in k
+ k[i] |= (y << (7-i)) & 0x80 ;
+
+
+
+ uint8_t zTilde_i = getSixBitByte(zTilde, i);
+ // zTildeI is now on the form 00XXXXXX
+ // with one leftshift, it'll be
+ // 0XXXXXX0
+ // So after leftshift, we can OR it into k
+ // However, when doing complement, we need to
+ // again MASK 0XXXXXX0 (0x7E)
+ zTilde_i <<= 1;
+
+ //Finally, add bit from p or p-mod
+ //Shift bit i into rightmost location (mask only after complement)
+ uint8_t p_i = p >> i & 0x1;
+
+ if( k[i] )// yi = 1
+ {
+ //printf("k[%d] +1\n", i);
+ k[i] |= ~zTilde_i & 0x7E;
+ k[i] |= p_i & 1;
+ k[i] += 1;
+
+ }else // otherwise
+ {
+ k[i] |= zTilde_i & 0x7E;
+ k[i] |= (~p_i) & 1;
+ }
+ if((k[i] & 1 )== 0)
+ {
+ zerocounter ++;
+ }
+ }
+}
+/**
+ * @brief Performs Elite-class key diversification
+ * @param csn
+ * @param key
+ * @param div_key
+ */
+void diversifyKey(uint8_t csn[8], uint8_t key[8], uint8_t div_key[8])
+{
+
+ // Prepare the DES key
+ des_setkey_enc( &ctx_enc, key);
+
+ uint8_t crypted_csn[8] = {0};
+
+ // Calculate DES(CSN, KEY)
+ des_crypt_ecb(&ctx_enc,csn, crypted_csn);
+
+ //Calculate HASH0(DES))
+ uint64_t crypt_csn = x_bytes_to_num(crypted_csn, 8);
+ //uint64_t crypted_csn_swapped = swapZvalues(crypt_csn);
+
+ hash0(crypt_csn,div_key);
+}
+
+
+
+
+
+void testPermute()
+{
+
+ uint64_t x = 0;
+ pushbackSixBitByte(&x,0x00,0);
+ pushbackSixBitByte(&x,0x01,1);
+ pushbackSixBitByte(&x,0x02,2);
+ pushbackSixBitByte(&x,0x03,3);
+ pushbackSixBitByte(&x,0x04,4);
+ pushbackSixBitByte(&x,0x05,5);
+ pushbackSixBitByte(&x,0x06,6);
+ pushbackSixBitByte(&x,0x07,7);
+
+ uint8_t mres[8] = { getSixBitByte(x, 0),
+ getSixBitByte(x, 1),
+ getSixBitByte(x, 2),
+ getSixBitByte(x, 3),
+ getSixBitByte(x, 4),
+ getSixBitByte(x, 5),
+ getSixBitByte(x, 6),
+ getSixBitByte(x, 7)};
+ printarr("input_perm", mres,8);
+
+ uint8_t p = ~pi[0];
+ BitstreamIn p_in = { &p, 8,0 };
+ uint8_t outbuffer[] = {0,0,0,0,0,0,0,0};
+ BitstreamOut out = {outbuffer,0,0};
+
+ permute(&p_in, x,0,4, &out);
+
+ uint64_t permuted = x_bytes_to_num(outbuffer,8);
+ //printf("zTilde 0x%"PRIX64"\n", zTilde);
+ permuted >>= 16;
+
+ uint8_t res[8] = { getSixBitByte(permuted, 0),
+ getSixBitByte(permuted, 1),
+ getSixBitByte(permuted, 2),
+ getSixBitByte(permuted, 3),
+ getSixBitByte(permuted, 4),
+ getSixBitByte(permuted, 5),
+ getSixBitByte(permuted, 6),
+ getSixBitByte(permuted, 7)};
+ printarr("permuted", res, 8);
+}
+
+//These testcases are
+//{ UID , TEMP_KEY, DIV_KEY} using the specific key
+typedef struct
+{
+ uint8_t uid[8];
+ uint8_t t_key[8];
+ uint8_t div_key[8];
+} Testcase;
+
+
+int testDES(Testcase testcase, des_context ctx_enc, des_context ctx_dec)
+{
+ uint8_t des_encrypted_csn[8] = {0};
+ uint8_t decrypted[8] = {0};
+ uint8_t div_key[8] = {0};
+ int retval = des_crypt_ecb(&ctx_enc,testcase.uid,des_encrypted_csn);
+ retval |= des_crypt_ecb(&ctx_dec,des_encrypted_csn,decrypted);
+
+ if(memcmp(testcase.uid,decrypted,8) != 0)
+ {
+ //Decryption fail
+ prnlog("Encryption <-> Decryption FAIL");
+ printarr("Input", testcase.uid, 8);
+ printarr("Decrypted", decrypted, 8);
+ retval = 1;
+ }
+
+ if(memcmp(des_encrypted_csn,testcase.t_key,8) != 0)
+ {
+ //Encryption fail
+ prnlog("Encryption != Expected result");
+ printarr("Output", des_encrypted_csn, 8);
+ printarr("Expected", testcase.t_key, 8);
+ retval = 1;
+ }
+ uint64_t crypted_csn = x_bytes_to_num(des_encrypted_csn,8);
+ hash0(crypted_csn, div_key);
+
+ if(memcmp(div_key, testcase.div_key ,8) != 0)
+ {
+ //Key diversification fail
+ prnlog("Div key != expected result");
+ printarr(" csn ", testcase.uid,8);
+ printarr("{csn} ", des_encrypted_csn,8);
+ printarr("hash0 ", div_key, 8);
+ printarr("Expected", testcase.div_key, 8);
+ retval = 1;
+
+ }
+ return retval;
+}
+bool des_getParityBitFromKey(uint8_t key)
+{//The top 7 bits is used
+ bool parity = ((key & 0x80) >> 7)
+ ^ ((key & 0x40) >> 6) ^ ((key & 0x20) >> 5)
+ ^ ((key & 0x10) >> 4) ^ ((key & 0x08) >> 3)
+ ^ ((key & 0x04) >> 2) ^ ((key & 0x02) >> 1);
+ return !parity;
+}
+
+
+void des_checkParity(uint8_t* key)
+{
+ int i;
+ int fails =0;
+ for(i =0 ; i < 8 ; i++)
+ {
+ bool parity = des_getParityBitFromKey(key[i]);
+ if(parity != (key[i] & 0x1))
+ {
+ fails++;
+ prnlog("[+] parity1 fail, byte %d [%02x] was %d, should be %d",i,key[i],(key[i] & 0x1),parity);
+ }
+ }
+ if(fails)
+ {
+ prnlog("[+] parity fails: %d", fails);
+ }else
+ {
+ prnlog("[+] Key syntax is with parity bits inside each byte");
+ }
+}
+
+Testcase testcases[] ={
+
+ {{0x8B,0xAC,0x60,0x1F,0x53,0xB8,0xED,0x11},{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00},{0x02,0x04,0x06,0x08,0x01,0x03,0x05,0x07}},
+ {{0xAE,0x51,0xE5,0x62,0xE7,0x9A,0x99,0x39},{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01},{0x04,0x02,0x06,0x08,0x01,0x03,0x05,0x07}},
+ {{0x9B,0x21,0xE4,0x31,0x6A,0x00,0x29,0x62},{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x02},{0x06,0x04,0x02,0x08,0x01,0x03,0x05,0x07}},
+ {{0x65,0x24,0x0C,0x41,0x4F,0xC2,0x21,0x93},{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x04},{0x0A,0x04,0x06,0x08,0x01,0x03,0x05,0x07}},
+ {{0x7F,0xEB,0xAE,0x93,0xE5,0x30,0x08,0xBD},{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x08},{0x12,0x04,0x06,0x08,0x01,0x03,0x05,0x07}},
+ {{0x49,0x7B,0x70,0x74,0x9B,0x35,0x1B,0x83},{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x10},{0x22,0x04,0x06,0x08,0x01,0x03,0x05,0x07}},
+ {{0x02,0x3C,0x15,0x6B,0xED,0xA5,0x64,0x6C},{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x20},{0x42,0x04,0x06,0x08,0x01,0x03,0x05,0x07}},
+ {{0xE8,0x37,0xE0,0xE2,0xC6,0x45,0x24,0xF3},{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x40},{0x02,0x06,0x04,0x08,0x01,0x03,0x05,0x07}},
+ {{0xAB,0xBD,0x30,0x05,0x29,0xC8,0xF7,0x12},{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x80},{0x02,0x08,0x06,0x04,0x01,0x03,0x05,0x07}},
+ {{0x17,0xE8,0x97,0xF0,0x99,0xB6,0x79,0x31},{0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x00},{0x02,0x0C,0x06,0x08,0x01,0x03,0x05,0x07}},
+ {{0x49,0xA4,0xF0,0x8F,0x5F,0x96,0x83,0x16},{0x00,0x00,0x00,0x00,0x00,0x00,0x02,0x00},{0x02,0x14,0x06,0x08,0x01,0x03,0x05,0x07}},
+ {{0x60,0xF5,0x7E,0x54,0xAA,0x41,0x83,0xD4},{0x00,0x00,0x00,0x00,0x00,0x00,0x04,0x00},{0x02,0x24,0x06,0x08,0x01,0x03,0x05,0x07}},
+ {{0x1D,0xF6,0x3B,0x6B,0x85,0x55,0xF0,0x4B},{0x00,0x00,0x00,0x00,0x00,0x00,0x08,0x00},{0x02,0x44,0x06,0x08,0x01,0x03,0x05,0x07}},
+ {{0x1F,0xDC,0x95,0x1A,0xEA,0x6B,0x4B,0xB4},{0x00,0x00,0x00,0x00,0x00,0x00,0x10,0x00},{0x02,0x04,0x08,0x06,0x01,0x03,0x05,0x07}},
+ {{0xEC,0x93,0x72,0xF0,0x3B,0xA9,0xF5,0x0B},{0x00,0x00,0x00,0x00,0x00,0x00,0x20,0x00},{0x02,0x04,0x0A,0x08,0x01,0x03,0x05,0x07}},
+ {{0xDE,0x57,0x5C,0xBE,0x2D,0x55,0x03,0x12},{0x00,0x00,0x00,0x00,0x00,0x00,0x40,0x00},{0x02,0x04,0x0E,0x08,0x01,0x03,0x05,0x07}},
+ {{0x1E,0xD2,0xB5,0xCE,0x90,0xC9,0xC1,0xCC},{0x00,0x00,0x00,0x00,0x00,0x00,0x80,0x00},{0x02,0x04,0x16,0x08,0x01,0x03,0x05,0x07}},
+ {{0xD8,0x65,0x96,0x4E,0xE7,0x74,0x99,0xB8},{0x00,0x00,0x00,0x00,0x00,0x01,0x00,0x00},{0x02,0x04,0x26,0x08,0x01,0x03,0x05,0x07}},
+ {{0xE3,0x7A,0x29,0x83,0x31,0xD5,0x3A,0x54},{0x00,0x00,0x00,0x00,0x00,0x02,0x00,0x00},{0x02,0x04,0x46,0x08,0x01,0x03,0x05,0x07}},
+ {{0x3A,0xB5,0x1A,0x34,0x34,0x25,0x12,0xF0},{0x00,0x00,0x00,0x00,0x00,0x04,0x00,0x00},{0x02,0x04,0x06,0x0A,0x01,0x03,0x05,0x07}},
+ {{0xF2,0x88,0xEE,0x6F,0x70,0x6F,0xC2,0x52},{0x00,0x00,0x00,0x00,0x00,0x08,0x00,0x00},{0x02,0x04,0x06,0x0C,0x01,0x03,0x05,0x07}},
+ {{0x76,0xEF,0xEB,0x80,0x52,0x43,0x83,0x57},{0x00,0x00,0x00,0x00,0x00,0x10,0x00,0x00},{0x02,0x04,0x06,0x10,0x01,0x03,0x05,0x07}},
+ {{0x1C,0x09,0x8E,0x3B,0x23,0x23,0x52,0xB5},{0x00,0x00,0x00,0x00,0x00,0x20,0x00,0x00},{0x02,0x04,0x06,0x18,0x01,0x03,0x05,0x07}},
+ {{0xA9,0x13,0xA2,0xBE,0xCF,0x1A,0xC4,0x9A},{0x00,0x00,0x00,0x00,0x00,0x40,0x00,0x00},{0x02,0x04,0x06,0x28,0x01,0x03,0x05,0x07}},
+ {{0x25,0x56,0x4B,0xB0,0xC8,0x2A,0xD4,0x27},{0x00,0x00,0x00,0x00,0x00,0x80,0x00,0x00},{0x02,0x04,0x06,0x48,0x01,0x03,0x05,0x07}},
+ {{0xB1,0x04,0x57,0x3F,0xA7,0x16,0x62,0xD4},{0x00,0x00,0x00,0x00,0x01,0x00,0x00,0x00},{0x02,0x04,0x06,0x08,0x03,0x01,0x05,0x07}},
+ {{0x45,0x46,0xED,0xCC,0xE7,0xD3,0x8E,0xA3},{0x00,0x00,0x00,0x00,0x02,0x00,0x00,0x00},{0x02,0x04,0x06,0x08,0x05,0x03,0x01,0x07}},
+ {{0x22,0x6D,0xB5,0x35,0xE0,0x5A,0xE0,0x90},{0x00,0x00,0x00,0x00,0x04,0x00,0x00,0x00},{0x02,0x04,0x06,0x08,0x09,0x03,0x05,0x07}},
+ {{0xB8,0xF5,0xE5,0x44,0xC5,0x98,0x4A,0xBD},{0x00,0x00,0x00,0x00,0x08,0x00,0x00,0x00},{0x02,0x04,0x06,0x08,0x11,0x03,0x05,0x07}},
+ {{0xAC,0x78,0x0A,0x23,0x9E,0xF6,0xBC,0xA0},{0x00,0x00,0x00,0x00,0x10,0x00,0x00,0x00},{0x02,0x04,0x06,0x08,0x21,0x03,0x05,0x07}},
+ {{0x46,0x6B,0x2D,0x70,0x41,0x17,0xBF,0x3D},{0x00,0x00,0x00,0x00,0x20,0x00,0x00,0x00},{0x02,0x04,0x06,0x08,0x41,0x03,0x05,0x07}},
+ {{0x64,0x44,0x24,0x71,0xA2,0x56,0xDF,0xB5},{0x00,0x00,0x00,0x00,0x40,0x00,0x00,0x00},{0x02,0x04,0x06,0x08,0x01,0x05,0x03,0x07}},
+ {{0xC4,0x00,0x52,0x24,0xA2,0xD6,0x16,0x7A},{0x00,0x00,0x00,0x00,0x80,0x00,0x00,0x00},{0x02,0x04,0x06,0x08,0x01,0x07,0x05,0x03}},
+ {{0xD8,0x4A,0x80,0x1E,0x95,0x5B,0x70,0xC4},{0x00,0x00,0x00,0x01,0x00,0x00,0x00,0x00},{0x02,0x04,0x06,0x08,0x01,0x0B,0x05,0x07}},
+ {{0x08,0x56,0x6E,0xB5,0x64,0xD6,0x47,0x4E},{0x00,0x00,0x00,0x02,0x00,0x00,0x00,0x00},{0x02,0x04,0x06,0x08,0x01,0x13,0x05,0x07}},
+ {{0x41,0x6F,0xBA,0xA4,0xEB,0xAE,0xA0,0x55},{0x00,0x00,0x00,0x04,0x00,0x00,0x00,0x00},{0x02,0x04,0x06,0x08,0x01,0x23,0x05,0x07}},
+ {{0x62,0x9D,0xDE,0x72,0x84,0x4A,0x53,0xD5},{0x00,0x00,0x00,0x08,0x00,0x00,0x00,0x00},{0x02,0x04,0x06,0x08,0x01,0x43,0x05,0x07}},
+ {{0x39,0xD3,0x2B,0x66,0xB8,0x08,0x40,0x2E},{0x00,0x00,0x00,0x10,0x00,0x00,0x00,0x00},{0x02,0x04,0x06,0x08,0x01,0x03,0x07,0x05}},
+ {{0xAF,0x67,0xA9,0x18,0x57,0x21,0xAF,0x8D},{0x00,0x00,0x00,0x20,0x00,0x00,0x00,0x00},{0x02,0x04,0x06,0x08,0x01,0x03,0x09,0x07}},
+ {{0x34,0xBC,0x9D,0xBC,0xC4,0xC2,0x3B,0xC8},{0x00,0x00,0x00,0x40,0x00,0x00,0x00,0x00},{0x02,0x04,0x06,0x08,0x01,0x03,0x0D,0x07}},
+ {{0xB6,0x50,0xF9,0x81,0xF6,0xBF,0x90,0x3C},{0x00,0x00,0x00,0x80,0x00,0x00,0x00,0x00},{0x02,0x04,0x06,0x08,0x01,0x03,0x15,0x07}},
+ {{0x71,0x41,0x93,0xA1,0x59,0x81,0xA5,0x52},{0x00,0x00,0x01,0x00,0x00,0x00,0x00,0x00},{0x02,0x04,0x06,0x08,0x01,0x03,0x25,0x07}},
+ {{0x6B,0x00,0xBD,0x74,0x1C,0x3C,0xE0,0x1A},{0x00,0x00,0x02,0x00,0x00,0x00,0x00,0x00},{0x02,0x04,0x06,0x08,0x01,0x03,0x45,0x07}},
+ {{0x76,0xFD,0x0B,0xD0,0x41,0xD2,0x82,0x5D},{0x00,0x00,0x04,0x00,0x00,0x00,0x00,0x00},{0x02,0x04,0x06,0x08,0x01,0x03,0x05,0x09}},
+ {{0xC6,0x3A,0x1C,0x25,0x63,0x5A,0x2F,0x0E},{0x00,0x00,0x08,0x00,0x00,0x00,0x00,0x00},{0x02,0x04,0x06,0x08,0x01,0x03,0x05,0x0B}},
+ {{0xD9,0x0E,0xD7,0x30,0xE2,0xAD,0xA9,0x87},{0x00,0x00,0x10,0x00,0x00,0x00,0x00,0x00},{0x02,0x04,0x06,0x08,0x01,0x03,0x05,0x0F}},
+ {{0x6B,0x81,0xC6,0xD1,0x05,0x09,0x87,0x1E},{0x00,0x00,0x20,0x00,0x00,0x00,0x00,0x00},{0x02,0x04,0x06,0x08,0x01,0x03,0x05,0x17}},
+ {{0xB4,0xA7,0x1E,0x02,0x54,0x37,0x43,0x35},{0x00,0x00,0x40,0x00,0x00,0x00,0x00,0x00},{0x02,0x04,0x06,0x08,0x01,0x03,0x05,0x27}},
+ {{0x45,0x14,0x7C,0x7F,0xE0,0xDE,0x09,0x65},{0x00,0x00,0x80,0x00,0x00,0x00,0x00,0x00},{0x02,0x04,0x06,0x08,0x01,0x03,0x05,0x47}},
+ {{0x78,0xB0,0xF5,0x20,0x8B,0x7D,0xF3,0xDD},{0x00,0x01,0x00,0x00,0x00,0x00,0x00,0x00},{0xFE,0x04,0x06,0x08,0x01,0x03,0x05,0x07}},
+ {{0x88,0xB3,0x3C,0xE1,0xF7,0x87,0x42,0xA1},{0x00,0x02,0x00,0x00,0x00,0x00,0x00,0x00},{0x02,0xFC,0x06,0x08,0x01,0x03,0x05,0x07}},
+ {{0x11,0x2F,0xB2,0xF7,0xE2,0xB2,0x4F,0x6E},{0x00,0x04,0x00,0x00,0x00,0x00,0x00,0x00},{0x02,0x04,0xFA,0x08,0x01,0x03,0x05,0x07}},
+ {{0x25,0x56,0x4E,0xC6,0xEB,0x2D,0x74,0x5B},{0x00,0x08,0x00,0x00,0x00,0x00,0x00,0x00},{0x02,0x04,0x06,0xF8,0x01,0x03,0x05,0x07}},
+ {{0x7E,0x98,0x37,0xF9,0x80,0x8F,0x09,0x82},{0x00,0x10,0x00,0x00,0x00,0x00,0x00,0x00},{0x02,0x04,0x06,0x08,0xFF,0x03,0x05,0x07}},
+ {{0xF9,0xB5,0x62,0x3B,0xD8,0x7B,0x3C,0x3F},{0x00,0x20,0x00,0x00,0x00,0x00,0x00,0x00},{0x02,0x04,0x06,0x08,0x01,0xFD,0x05,0x07}},
+ {{0x29,0xC5,0x2B,0xFA,0xD1,0xFC,0x5C,0xC7},{0x00,0x40,0x00,0x00,0x00,0x00,0x00,0x00},{0x02,0x04,0x06,0x08,0x01,0x03,0xFB,0x07}},
+ {{0xC1,0xA3,0x09,0x71,0xBD,0x8E,0xAF,0x2F},{0x00,0x80,0x00,0x00,0x00,0x00,0x00,0x00},{0x02,0x04,0x06,0x08,0x01,0x03,0x05,0xF9}},
+ {{0xB6,0xDD,0xD1,0xAD,0xAA,0x15,0x6F,0x29},{0x01,0x00,0x00,0x00,0x00,0x00,0x00,0x00},{0x01,0x03,0x05,0x02,0x07,0x04,0x06,0x08}},
+ {{0x65,0x34,0x03,0x19,0x17,0xB3,0xA3,0x96},{0x02,0x00,0x00,0x00,0x00,0x00,0x00,0x00},{0x02,0x04,0x01,0x06,0x08,0x03,0x05,0x07}},
+ {{0xF9,0x38,0x43,0x56,0x52,0xE5,0xB1,0xA9},{0x04,0x00,0x00,0x00,0x00,0x00,0x00,0x00},{0x01,0x02,0x04,0x06,0x08,0x03,0x05,0x07}},
+
+ {{0xA4,0xA0,0xAF,0xDA,0x48,0xB0,0xA1,0x10},{0x08,0x00,0x00,0x00,0x00,0x00,0x00,0x00},{0x01,0x02,0x04,0x06,0x03,0x08,0x05,0x07}},
+ {{0x55,0x15,0x8A,0x0D,0x48,0x29,0x01,0xD8},{0x10,0x00,0x00,0x00,0x00,0x00,0x00,0x00},{0x02,0x04,0x01,0x06,0x03,0x05,0x08,0x07}},
+ {{0xC4,0x81,0x96,0x7D,0xA3,0xB7,0x73,0x50},{0x20,0x00,0x00,0x00,0x00,0x00,0x00,0x00},{0x01,0x02,0x03,0x05,0x04,0x06,0x08,0x07}},
+ {{0x36,0x73,0xDF,0xC1,0x1B,0x98,0xA8,0x1D},{0x40,0x00,0x00,0x00,0x00,0x00,0x00,0x00},{0x01,0x02,0x03,0x04,0x05,0x06,0x08,0x07}},
+ {{0xCE,0xE0,0xB3,0x1B,0x41,0xEB,0x15,0x12},{0x80,0x00,0x00,0x00,0x00,0x00,0x00,0x00},{0x01,0x02,0x03,0x04,0x06,0x05,0x08,0x07}},
+ {{0},{0},{0}}
+};
+
+
+int testKeyDiversificationWithMasterkeyTestcases()
+{
+
+ int error = 0;
+ int i;
+
+ uint8_t empty[8]={0};
+ prnlog("[+} Testing encryption/decryption");
+
+ for (i = 0; memcmp(testcases+i,empty,8) ; i++) {
+ error += testDES(testcases[i],ctx_enc, ctx_dec);
+ }
+ if(error)
+ {
+ prnlog("[+] %d errors occurred (%d testcases)", error, i);
+ }else
+ {
+ prnlog("[+] Hashing seems to work (%d testcases)", i);
+ }
+ return error;
+}
+
+
+void print64bits(char*name, uint64_t val)
+{
+ printf("%s%08x%08x\n",name,(uint32_t) (val >> 32) ,(uint32_t) (val & 0xFFFFFFFF));
+}
+
+uint64_t testCryptedCSN(uint64_t crypted_csn, uint64_t expected)
+{
+ int retval = 0;
+ uint8_t result[8] = {0};
+ if(debug_print) prnlog("debug_print %d", debug_print);
+ if(debug_print) print64bits(" {csn} ", crypted_csn );
+
+ uint64_t crypted_csn_swapped = swapZvalues(crypted_csn);
+
+ if(debug_print) print64bits(" {csn-revz} ", crypted_csn_swapped);
+
+ hash0(crypted_csn, result);
+ uint64_t resultbyte = x_bytes_to_num(result,8 );
+ if(debug_print) print64bits(" hash0 " , resultbyte );
+
+ if(resultbyte != expected )
+ {
+
+ if(debug_print) {
+ prnlog("\n[+] FAIL!");
+ print64bits(" expected " , expected );
+ }
+ retval = 1;
+
+ }else
+ {
+ if(debug_print) prnlog(" [OK]");
+ }
+ return retval;
+}
+
+int testDES2(uint64_t csn, uint64_t expected)
+{
+ uint8_t result[8] = {0};
+ uint8_t input[8] = {0};
+
+ print64bits(" csn ", csn);
+ x_num_to_bytes(csn, 8,input);
+
+ des_crypt_ecb(&ctx_enc,input, result);
+
+ uint64_t crypt_csn = x_bytes_to_num(result, 8);
+ print64bits(" {csn} ", crypt_csn );
+ print64bits(" expected ", expected );
+
+ if( expected == crypt_csn )
+ {
+ prnlog("[+] OK");
+ return 0;
+ }else
+ {
+ return 1;
+ }
+}
+
+/**
+ * These testcases come from http://www.proxmark.org/forum/viewtopic.php?pid=10977#p10977
+ * @brief doTestsWithKnownInputs
+ * @return
+ */
+int doTestsWithKnownInputs()
+{
+
+ // KSel from http://www.proxmark.org/forum/viewtopic.php?pid=10977#p10977
+ int errors = 0;
+ prnlog("[+] Testing DES encryption");
+// uint8_t key[8] = {0x6c,0x8d,0x44,0xf9,0x2a,0x2d,0x01,0xbf};
+ prnlog("[+] Testing foo");
+ uint8_t key[8] = {0x6c,0x8d,0x44,0xf9,0x2a,0x2d,0x01,0xbf};
+
+ des_setkey_enc( &ctx_enc, key);
+ testDES2(0xbbbbaaaabbbbeeee,0xd6ad3ca619659e6b);
+
+ prnlog("[+] Testing hashing algorithm");
+
+ errors += testCryptedCSN(0x0102030405060708,0x0bdd6512073c460a);
+ errors += testCryptedCSN(0x1020304050607080,0x0208211405f3381f);
+ errors += testCryptedCSN(0x1122334455667788,0x2bee256d40ac1f3a);
+ errors += testCryptedCSN(0xabcdabcdabcdabcd,0xa91c9ec66f7da592);
+ errors += testCryptedCSN(0xbcdabcdabcdabcda,0x79ca5796a474e19b);
+ errors += testCryptedCSN(0xcdabcdabcdabcdab,0xa8901b9f7ec76da4);
+ errors += testCryptedCSN(0xdabcdabcdabcdabc,0x357aa8e0979a5b8d);
+ errors += testCryptedCSN(0x21ba6565071f9299,0x34e80f88d5cf39ea);
+ errors += testCryptedCSN(0x14e2adfc5bb7e134,0x6ac90c6508bd9ea3);
+
+ if(errors)
+ {
+ prnlog("[+] %d errors occurred (9 testcases)", errors);
+ }else
+ {
+ prnlog("[+] Hashing seems to work (9 testcases)" );
+ }
+ return errors;
+}
+
+int readKeyFile(uint8_t key[8])
+{
+
+ FILE *f;
+
+ f = fopen("iclass_key.bin", "rb");
+ if (f)
+ {
+ if(fread(key, sizeof(key), 1, f) == 1) return 0;
+ }
+ return 1;
+
+}
+
+
+int doKeyTests(uint8_t debuglevel)
+{
+ debug_print = debuglevel;
+
+ prnlog("[+] Checking if the master key is present (iclass_key.bin)...");
+ uint8_t key[8] = {0};
+ if(readKeyFile(key))
+ {
+ prnlog("[+] Master key not present, will not be able to do all testcases");
+ }else
+ {
+
+ //Test if it's the right key...
+ uint8_t i;
+ uint8_t j = 0;
+ for(i =0 ; i < sizeof(key) ; i++)
+ j += key[i];
+
+ if(j != 185)
+ {
+ prnlog("[+] A key was loaded, but it does not seem to be the correct one. Aborting these tests");
+ }else
+ {
+ prnlog("[+] Key present");
+
+ prnlog("[+] Checking key parity...");
+ des_checkParity(key);
+ des_setkey_enc( &ctx_enc, key);
+ des_setkey_dec( &ctx_dec, key);
+ // Test hashing functions
+ prnlog("[+] The following tests require the correct 8-byte master key");
+ testKeyDiversificationWithMasterkeyTestcases();
+ }
+ }
+ prnlog("[+] Testing key diversification with non-sensitive keys...");
+ doTestsWithKnownInputs();
+ return 0;
+}
+
+/**
+
+void checkParity2(uint8_t* key)
+{
+
+ uint8_t stored_parity = key[7];
+ printf("Parity byte: 0x%02x\n", stored_parity);
+ int i;
+ int byte;
+ int fails =0;
+ BitstreamIn bits = {key, 56, 0};
+
+ bool parity = 0;
+
+ for(i =0 ; i < 56; i++)
+ {
+
+ if ( i > 0 && i % 7 == 0)
+ {
+ parity = !parity;
+ bool pbit = stored_parity & (0x80 >> (byte));
+ if(parity != pbit)
+ {
+ printf("parity2 fail byte %d, should be %d, was %d\n", (i / 7), parity, pbit);
+ fails++;
+ }
+ parity =0 ;
+ byte = i / 7;
+ }
+ parity = parity ^ headBit(&bits);
+ }
+ if(fails)
+ {
+ printf("parity2 fails: %d\n", fails);
+ }else
+ {
+ printf("Key syntax is with parity bits grouped in the last byte!\n");
+ }
+}
+void modifyKey_put_parity_last(uint8_t * key, uint8_t* output)
+{
+ uint8_t paritybits = 0;
+ bool parity =0;
+ BitstreamOut out = { output, 0,0};
+ unsigned int bbyte, bbit;
+ for(bbyte=0; bbyte <8 ; bbyte++ )
+ {
+ for(bbit =0 ; bbit< 7 ; bbit++)
+ {
+ bool bit = *(key+bbyte) & (1 << (7-bbit));
+ pushBit(&out,bit);
+ parity ^= bit;
+ }
+ bool paritybit = *(key+bbyte) & 1;
+ paritybits |= paritybit << (7-bbyte);
+ parity = 0;
+
+ }
+ output[7] = paritybits;
+ printf("Parity byte: %02x\n", paritybits);
+}
+
+ * @brief Modifies a key with parity bits last, so that it is formed with parity
+ * bits inside each byte
+ * @param key
+ * @param output
+
+void modifyKey_put_parity_allover(uint8_t * key, uint8_t* output)
+{
+ bool parity =0;
+ BitstreamOut out = { output, 0,0};
+ BitstreamIn in = {key, 0,0};
+ unsigned int bbyte, bbit;
+ for(bbit =0 ; bbit < 56 ; bbit++)
+ {
+
+ if( bbit > 0 && bbit % 7 == 0)
+ {
+ pushBit(&out,!parity);
+ parity = 0;
+ }
+ bool bit = headBit(&in);
+ pushBit(&out,bit );
+ parity ^= bit;
+
+ }
+ pushBit(&out, !parity);
+
+
+ if( des_key_check_key_parity(output))
+ {
+ printf("modifyKey_put_parity_allover fail, DES key invalid parity!");
+ }
+
+}
+
+*/
+
+
projects / proxmark3-svn / blobdiff