mirror of
https://github.com/Proxmark/proxmark3.git
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890 lines
28 KiB
C
890 lines
28 KiB
C
/*****************************************************************************
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* WARNING
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*
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* THIS CODE IS CREATED FOR EXPERIMENTATION AND EDUCATIONAL USE ONLY.
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*
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* USAGE OF THIS CODE IN OTHER WAYS MAY INFRINGE UPON THE INTELLECTUAL
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* PROPERTY OF OTHER PARTIES, SUCH AS INSIDE SECURE AND HID GLOBAL,
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* AND MAY EXPOSE YOU TO AN INFRINGEMENT ACTION FROM THOSE PARTIES.
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*
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* THIS CODE SHOULD NEVER BE USED TO INFRINGE PATENTS OR INTELLECTUAL PROPERTY RIGHTS.
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*
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*****************************************************************************
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*
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* This file is part of loclass. It is a reconstructon of the cipher engine
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* used in iClass, and RFID techology.
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*
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* The implementation is based on the work performed by
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* Flavio D. Garcia, Gerhard de Koning Gans, Roel Verdult and
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* Milosch Meriac in the paper "Dismantling IClass".
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*
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* Copyright (C) 2014 Martin Holst Swende
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*
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* This is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation, or, at your option, any later version.
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*
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* This file is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with loclass. If not, see <http://www.gnu.org/licenses/>.
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*
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*
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****************************************************************************/
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/**
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From "Dismantling iclass":
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This section describes in detail the built-in key diversification algorithm of iClass.
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Besides the obvious purpose of deriving a card key from a master key, this
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algorithm intends to circumvent weaknesses in the cipher by preventing the
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usage of certain ‘weak’ keys. In order to compute a diversified key, the iClass
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reader first encrypts the card identity id with the master key K, using single
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DES. The resulting ciphertext is then input to a function called hash0 which
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outputs the diversified key k.
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k = hash0(DES enc (id, K))
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Here the DES encryption of id with master key K outputs a cryptogram c
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of 64 bits. These 64 bits are divided as c = x, y, z [0] , . . . , z [7] ∈ F 82 × F 82 × (F 62 ) 8
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which is used as input to the hash0 function. This function introduces some
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obfuscation by performing a number of permutations, complement and modulo
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operations, see Figure 2.5. Besides that, it checks for and removes patterns like
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similar key bytes, which could produce a strong bias in the cipher. Finally, the
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output of hash0 is the diversified card key k = k [0] , . . . , k [7] ∈ (F 82 ) 8 .
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**/
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#include <stdint.h>
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#include <stdbool.h>
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#include <string.h>
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#include <stdio.h>
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#include <inttypes.h>
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#include "fileutils.h"
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#include "cipherutils.h"
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#include "mbedtls/des.h"
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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};
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static mbedtls_des_context ctx_enc = { {0} };
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static mbedtls_des_context ctx_dec = { {0} };
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static int debug_print = 0;
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/**
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* @brief The key diversification algorithm uses 6-bit bytes.
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* This implementation uses 64 bit uint to pack seven of them into one
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* variable. When they are there, they are placed as follows:
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* XXXX XXXX N0 .... N7, occupying the lsat 48 bits.
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*
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* This function picks out one from such a collection
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* @param all
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* @param n bitnumber
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* @return
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*/
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uint8_t getSixBitByte(uint64_t c, int n)
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{
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return (c >> (42-6*n)) & 0x3F;
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}
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/**
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* @brief Puts back a six-bit 'byte' into a uint64_t.
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* @param c buffer
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* @param z the value to place there
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* @param n bitnumber.
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*/
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void pushbackSixBitByte(uint64_t *c, uint8_t z, int n)
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{
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//0x XXXX YYYY ZZZZ ZZZZ ZZZZ
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// ^z0 ^z7
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//z0: 1111 1100 0000 0000
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uint64_t masked = z & 0x3F;
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uint64_t eraser = 0x3F;
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masked <<= 42-6*n;
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eraser <<= 42-6*n;
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//masked <<= 6*n;
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//eraser <<= 6*n;
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eraser = ~eraser;
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(*c) &= eraser;
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(*c) |= masked;
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}
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/**
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* @brief Swaps the z-values.
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* If the input value has format XYZ0Z1...Z7, the output will have the format
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* XYZ7Z6...Z0 instead
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* @param c
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* @return
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*/
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uint64_t swapZvalues(uint64_t c)
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{
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uint64_t newz = 0;
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pushbackSixBitByte(&newz, getSixBitByte(c,0),7);
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pushbackSixBitByte(&newz, getSixBitByte(c,1),6);
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pushbackSixBitByte(&newz, getSixBitByte(c,2),5);
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pushbackSixBitByte(&newz, getSixBitByte(c,3),4);
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pushbackSixBitByte(&newz, getSixBitByte(c,4),3);
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pushbackSixBitByte(&newz, getSixBitByte(c,5),2);
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pushbackSixBitByte(&newz, getSixBitByte(c,6),1);
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pushbackSixBitByte(&newz, getSixBitByte(c,7),0);
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newz |= (c & 0xFFFF000000000000);
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return newz;
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}
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/**
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* @return 4 six-bit bytes chunked into a uint64_t,as 00..00a0a1a2a3
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*/
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uint64_t ck(int i, int j, uint64_t z)
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{
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if(i == 1 && j == -1)
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{
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// ck(1, −1, z [0] . . . z [3] ) = z [0] . . . z [3]
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return z;
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}else if( j == -1)
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{
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// ck(i, −1, z [0] . . . z [3] ) = ck(i − 1, i − 2, z [0] . . . z [3] )
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return ck(i-1,i-2, z);
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}
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if(getSixBitByte(z,i) == getSixBitByte(z,j))
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{
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//ck(i, j − 1, z [0] . . . z [i] ← j . . . z [3] )
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uint64_t newz = 0;
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int c;
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for(c = 0; c < 4 ;c++)
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{
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uint8_t val = getSixBitByte(z,c);
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if(c == i)
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{
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pushbackSixBitByte(&newz, j, c);
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}else
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{
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pushbackSixBitByte(&newz, val, c);
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}
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}
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return ck(i,j-1,newz);
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}else
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{
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return ck(i,j-1,z);
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}
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}
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/**
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Definition 8.
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Let the function check : (F 62 ) 8 → (F 62 ) 8 be defined as
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check(z [0] . . . z [7] ) = ck(3, 2, z [0] . . . z [3] ) · ck(3, 2, z [4] . . . z [7] )
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where ck : N × N × (F 62 ) 4 → (F 62 ) 4 is defined as
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ck(1, −1, z [0] . . . z [3] ) = z [0] . . . z [3]
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ck(i, −1, z [0] . . . z [3] ) = ck(i − 1, i − 2, z [0] . . . z [3] )
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ck(i, j, z [0] . . . z [3] ) =
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ck(i, j − 1, z [0] . . . z [i] ← j . . . z [3] ), if z [i] = z [j] ;
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ck(i, j − 1, z [0] . . . z [3] ), otherwise
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otherwise.
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**/
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uint64_t check(uint64_t z)
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{
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//These 64 bits are divided as c = x, y, z [0] , . . . , z [7]
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// ck(3, 2, z [0] . . . z [3] )
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uint64_t ck1 = ck(3,2, z );
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// ck(3, 2, z [4] . . . z [7] )
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uint64_t ck2 = ck(3,2, z << 24);
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//The ck function will place the values
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// in the middle of z.
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ck1 &= 0x00000000FFFFFF000000;
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ck2 &= 0x00000000FFFFFF000000;
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return ck1 | ck2 >> 24;
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}
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void permute(BitstreamIn *p_in, uint64_t z,int l,int r, BitstreamOut* out)
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{
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if(bitsLeft(p_in) == 0)
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{
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return;
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}
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bool pn = tailBit(p_in);
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if( pn ) // pn = 1
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{
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uint8_t zl = getSixBitByte(z,l);
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push6bits(out, zl+1);
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permute(p_in, z, l+1,r, out);
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}else // otherwise
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{
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uint8_t zr = getSixBitByte(z,r);
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push6bits(out, zr);
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permute(p_in,z,l,r+1,out);
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}
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}
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void printbegin()
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{
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if(debug_print <2)
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return ;
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prnlog(" | x| y|z0|z1|z2|z3|z4|z5|z6|z7|");
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}
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void printState(char* desc, uint64_t c)
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{
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if(debug_print < 2)
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return ;
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printf("%s : ", desc);
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uint8_t x = (c & 0xFF00000000000000 ) >> 56;
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uint8_t y = (c & 0x00FF000000000000 ) >> 48;
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printf(" %02x %02x", x,y);
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int i ;
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for(i =0 ; i < 8 ; i++)
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{
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printf(" %02x", getSixBitByte(c,i));
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}
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printf("\n");
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}
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/**
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* @brief
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*Definition 11. Let the function hash0 : F 82 × F 82 × (F 62 ) 8 → (F 82 ) 8 be defined as
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* hash0(x, y, z [0] . . . z [7] ) = k [0] . . . k [7] where
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* z'[i] = (z[i] mod (63-i)) + i i = 0...3
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* z'[i+4] = (z[i+4] mod (64-i)) + i i = 0...3
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* ẑ = check(z');
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* @param c
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* @param k this is where the diversified key is put (should be 8 bytes)
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* @return
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*/
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void hash0(uint64_t c, uint8_t k[8])
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{
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c = swapZvalues(c);
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printbegin();
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printState("origin",c);
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//These 64 bits are divided as c = x, y, z [0] , . . . , z [7]
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// x = 8 bits
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// y = 8 bits
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// z0-z7 6 bits each : 48 bits
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uint8_t x = (c & 0xFF00000000000000 ) >> 56;
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uint8_t y = (c & 0x00FF000000000000 ) >> 48;
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int n;
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uint8_t zn, zn4, _zn, _zn4;
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uint64_t zP = 0;
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for(n = 0; n < 4 ; n++)
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{
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zn = getSixBitByte(c,n);
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zn4 = getSixBitByte(c,n+4);
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_zn = (zn % (63-n)) + n;
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_zn4 = (zn4 % (64-n)) + n;
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pushbackSixBitByte(&zP, _zn,n);
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pushbackSixBitByte(&zP, _zn4,n+4);
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}
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printState("0|0|z'",zP);
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uint64_t zCaret = check(zP);
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printState("0|0|z^",zP);
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uint8_t p = pi[x % 35];
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if(x & 1) //Check if x7 is 1
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{
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p = ~p;
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}
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if(debug_print >= 2) prnlog("p:%02x", p);
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BitstreamIn p_in = { &p, 8,0 };
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uint8_t outbuffer[] = {0,0,0,0,0,0,0,0};
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BitstreamOut out = {outbuffer,0,0};
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permute(&p_in,zCaret,0,4,&out);//returns 48 bits? or 6 8-bytes
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//Out is now a buffer containing six-bit bytes, should be 48 bits
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// if all went well
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//Shift z-values down onto the lower segment
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uint64_t zTilde = x_bytes_to_num(outbuffer,8);
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zTilde >>= 16;
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printState("0|0|z~", zTilde);
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int i;
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int zerocounter =0 ;
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for(i =0 ; i < 8 ; i++)
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{
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// the key on index i is first a bit from y
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// then six bits from z,
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// then a bit from p
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// Init with zeroes
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k[i] = 0;
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// First, place yi leftmost in k
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//k[i] |= (y << i) & 0x80 ;
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// First, place y(7-i) leftmost in k
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k[i] |= (y << (7-i)) & 0x80 ;
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uint8_t zTilde_i = getSixBitByte(zTilde, i);
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// zTildeI is now on the form 00XXXXXX
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// with one leftshift, it'll be
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// 0XXXXXX0
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// So after leftshift, we can OR it into k
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// However, when doing complement, we need to
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// again MASK 0XXXXXX0 (0x7E)
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zTilde_i <<= 1;
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//Finally, add bit from p or p-mod
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//Shift bit i into rightmost location (mask only after complement)
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uint8_t p_i = p >> i & 0x1;
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if( k[i] )// yi = 1
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{
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//printf("k[%d] +1\n", i);
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k[i] |= ~zTilde_i & 0x7E;
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k[i] |= p_i & 1;
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k[i] += 1;
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}else // otherwise
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{
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k[i] |= zTilde_i & 0x7E;
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k[i] |= (~p_i) & 1;
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}
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if((k[i] & 1 )== 0)
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{
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zerocounter ++;
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}
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}
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}
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/**
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* @brief Performs Elite-class key diversification
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* @param csn
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* @param key
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* @param div_key
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*/
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void diversifyKey(uint8_t csn[8], uint8_t key[8], uint8_t div_key[8])
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{
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// Prepare the DES key
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mbedtls_des_setkey_enc( &ctx_enc, key);
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uint8_t crypted_csn[8] = {0};
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// Calculate DES(CSN, KEY)
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mbedtls_des_crypt_ecb(&ctx_enc,csn, crypted_csn);
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//Calculate HASH0(DES))
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uint64_t crypt_csn = x_bytes_to_num(crypted_csn, 8);
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//uint64_t crypted_csn_swapped = swapZvalues(crypt_csn);
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hash0(crypt_csn,div_key);
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}
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void testPermute()
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{
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uint64_t x = 0;
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pushbackSixBitByte(&x,0x00,0);
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pushbackSixBitByte(&x,0x01,1);
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pushbackSixBitByte(&x,0x02,2);
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pushbackSixBitByte(&x,0x03,3);
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pushbackSixBitByte(&x,0x04,4);
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pushbackSixBitByte(&x,0x05,5);
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pushbackSixBitByte(&x,0x06,6);
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pushbackSixBitByte(&x,0x07,7);
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uint8_t mres[8] = { getSixBitByte(x, 0),
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getSixBitByte(x, 1),
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getSixBitByte(x, 2),
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getSixBitByte(x, 3),
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getSixBitByte(x, 4),
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getSixBitByte(x, 5),
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getSixBitByte(x, 6),
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getSixBitByte(x, 7)};
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printarr("input_perm", mres,8);
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uint8_t p = ~pi[0];
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BitstreamIn p_in = { &p, 8,0 };
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uint8_t outbuffer[] = {0,0,0,0,0,0,0,0};
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BitstreamOut out = {outbuffer,0,0};
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permute(&p_in, x,0,4, &out);
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uint64_t permuted = x_bytes_to_num(outbuffer,8);
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//printf("zTilde 0x%"PRIX64"\n", zTilde);
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permuted >>= 16;
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uint8_t res[8] = { getSixBitByte(permuted, 0),
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getSixBitByte(permuted, 1),
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getSixBitByte(permuted, 2),
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getSixBitByte(permuted, 3),
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getSixBitByte(permuted, 4),
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getSixBitByte(permuted, 5),
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getSixBitByte(permuted, 6),
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getSixBitByte(permuted, 7)};
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printarr("permuted", res, 8);
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}
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|
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//These testcases are
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//{ UID , TEMP_KEY, DIV_KEY} using the specific key
|
||
typedef struct
|
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{
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uint8_t uid[8];
|
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uint8_t t_key[8];
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uint8_t div_key[8];
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} Testcase;
|
||
|
||
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int testDES(Testcase testcase, mbedtls_des_context ctx_enc, mbedtls_des_context ctx_dec)
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||
{
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uint8_t des_encrypted_csn[8] = {0};
|
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uint8_t decrypted[8] = {0};
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uint8_t div_key[8] = {0};
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int retval = mbedtls_des_crypt_ecb(&ctx_enc,testcase.uid,des_encrypted_csn);
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retval |= mbedtls_des_crypt_ecb(&ctx_dec,des_encrypted_csn,decrypted);
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|
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if(memcmp(testcase.uid,decrypted,8) != 0)
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{
|
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//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);
|
||
|
||
mbedtls_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};
|
||
|
||
mbedtls_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;
|
||
int retval = 1;
|
||
f = fopen("iclass_key.bin", "rb");
|
||
if (!f)
|
||
return retval;
|
||
|
||
if (fread(key, sizeof(uint8_t), 8, f) == 8) {
|
||
retval = 0;
|
||
}
|
||
fclose(f);
|
||
return retval;
|
||
}
|
||
|
||
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);
|
||
mbedtls_des_setkey_enc( &ctx_enc, key);
|
||
mbedtls_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!");
|
||
}
|
||
|
||
}
|
||
|
||
*/
|
||
|
||
|