+++ /dev/null
-/*****************************************************************************
- * WARNING
- *
- * THIS CODE IS CREATED FOR EXPERIMENTATION AND EDUCATIONAL USE ONLY.
- *
- * USAGE OF THIS CODE IN OTHER WAYS MAY INFRINGE UPON THE INTELLECTUAL
- * PROPERTY OF OTHER PARTIES, SUCH AS INSIDE SECURE AND HID GLOBAL,
- * AND MAY EXPOSE YOU TO AN INFRINGEMENT ACTION FROM THOSE PARTIES.
- *
- * THIS CODE SHOULD NEVER BE USED TO INFRINGE PATENTS OR INTELLECTUAL PROPERTY RIGHTS.
- *
- *****************************************************************************
- *
- * This file is part of loclass. 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".
- *
- * 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 loclass. If not, see <http://www.gnu.org/licenses/>.
- *
- *
- *
- ****************************************************************************/
-
-#include <stdint.h>
-#include <stdio.h>
-#include <string.h>
-#include "cipherutils.h"
-#ifndef ON_DEVICE
-#include "fileutils.h"
-#endif
-/**
- *
- * @brief Return and remove the first bit (x0) in the stream : <x0 x1 x2 x3 ... xn >
- * @param stream
- * @return
- */
-bool headBit( BitstreamIn *stream)
-{
- int bytepos = stream->position >> 3; // divide by 8
- int bitpos = (stream->position++) & 7; // mask out 00000111
- return (*(stream->buffer + bytepos) >> (7-bitpos)) & 1;
-}
-/**
- * @brief Return and remove the last bit (xn) in the stream: <x0 x1 x2 ... xn>
- * @param stream
- * @return
- */
-bool tailBit( BitstreamIn *stream)
-{
- int bitpos = stream->numbits -1 - (stream->position++);
-
- int bytepos= bitpos >> 3;
- bitpos &= 7;
- return (*(stream->buffer + bytepos) >> (7-bitpos)) & 1;
-}
-/**
- * @brief Pushes bit onto the stream
- * @param stream
- * @param bit
- */
-void pushBit( BitstreamOut* stream, bool bit)
-{
- int bytepos = stream->position >> 3; // divide by 8
- int bitpos = stream->position & 7;
- *(stream->buffer+bytepos) |= (bit & 1) << (7 - bitpos);
- stream->position++;
- stream->numbits++;
-}
-
-/**
- * @brief Pushes the lower six bits onto the stream
- * as b0 b1 b2 b3 b4 b5 b6
- * @param stream
- * @param bits
- */
-void push6bits( BitstreamOut* stream, uint8_t bits)
-{
- pushBit(stream, bits & 0x20);
- pushBit(stream, bits & 0x10);
- pushBit(stream, bits & 0x08);
- pushBit(stream, bits & 0x04);
- pushBit(stream, bits & 0x02);
- pushBit(stream, bits & 0x01);
-}
-
-/**
- * @brief bitsLeft
- * @param stream
- * @return number of bits left in stream
- */
-int bitsLeft( BitstreamIn *stream)
-{
- return stream->numbits - stream->position;
-}
-/**
- * @brief numBits
- * @param stream
- * @return Number of bits stored in stream
- */
-int numBits(BitstreamOut *stream)
-{
- return stream->numbits;
-}
-
-void x_num_to_bytes(uint64_t n, size_t len, uint8_t* dest)
-{
- while (len--) {
- dest[len] = (uint8_t) n;
- n >>= 8;
- }
-}
-
-uint64_t x_bytes_to_num(uint8_t* src, size_t len)
-{
- uint64_t num = 0;
- while (len--)
- {
- num = (num << 8) | (*src);
- src++;
- }
- return num;
-}
-uint8_t reversebytes(uint8_t b) {
- b = (b & 0xF0) >> 4 | (b & 0x0F) << 4;
- b = (b & 0xCC) >> 2 | (b & 0x33) << 2;
- b = (b & 0xAA) >> 1 | (b & 0x55) << 1;
- return b;
-}
-void reverse_arraybytes(uint8_t* arr, size_t len)
-{
- uint8_t i;
- for( i =0; i< len ; i++)
- {
- arr[i] = reversebytes(arr[i]);
- }
-}
-void reverse_arraycopy(uint8_t* arr, uint8_t* dest, size_t len)
-{
- uint8_t i;
- for( i =0; i< len ; i++)
- {
- dest[i] = reversebytes(arr[i]);
- }
-}
-#ifndef ON_DEVICE
-void printarr(char * name, uint8_t* arr, int len)
-{
- int cx;
- size_t outsize = 40+strlen(name)+len*5;
- char* output = malloc(outsize);
- memset(output, 0,outsize);
-
- int i ;
- cx = snprintf(output,outsize, "uint8_t %s[] = {", name);
- for(i =0 ; i< len ; i++)
- {
- cx += snprintf(output+cx,outsize-cx,"0x%02x,",*(arr+i));//5 bytes per byte
- }
- cx += snprintf(output+cx,outsize-cx,"};");
- prnlog(output);
-}
-
-void printvar(char * name, uint8_t* arr, int len)
-{
- int cx;
- size_t outsize = 40+strlen(name)+len*2;
- char* output = malloc(outsize);
- memset(output, 0,outsize);
-
- int i ;
- cx = snprintf(output,outsize,"%s = ", name);
- for(i =0 ; i< len ; i++)
- {
- cx += snprintf(output+cx,outsize-cx,"%02x",*(arr+i));//2 bytes per byte
- }
-
- prnlog(output);
-}
-
-void printarr_human_readable(char * title, uint8_t* arr, int len)
-{
- int cx;
- size_t outsize = 100+strlen(title)+len*4;
- char* output = malloc(outsize);
- memset(output, 0,outsize);
-
-
- int i;
- cx = snprintf(output,outsize, "\n\t%s\n", title);
- for(i =0 ; i< len ; i++)
- {
- if(i % 16 == 0)
- cx += snprintf(output+cx,outsize-cx,"\n%02x| ", i );
- cx += snprintf(output+cx,outsize-cx, "%02x ",*(arr+i));
- }
- prnlog(output);
- free(output);
-}
-#endif
-//-----------------------------
-// Code for testing below
-//-----------------------------
-
-#ifndef ON_DEVICE
-int testBitStream()
-{
- uint8_t input [] = {0xDE,0xAD,0xBE,0xEF,0xDE,0xAD,0xBE,0xEF};
- uint8_t output [] = {0,0,0,0,0,0,0,0};
- BitstreamIn in = { input, sizeof(input) * 8,0};
- BitstreamOut out ={ output, 0,0}
- ;
- while(bitsLeft(&in) > 0)
- {
- pushBit(&out, headBit(&in));
- //printf("Bits left: %d\n", bitsLeft(&in));
- //printf("Bits out: %d\n", numBits(&out));
- }
- if(memcmp(input, output, sizeof(input)) == 0)
- {
- prnlog(" Bitstream test 1 ok");
- }else
- {
- prnlog(" Bitstream test 1 failed");
- uint8_t i;
- for(i = 0 ; i < sizeof(input) ; i++)
- {
- prnlog(" IN %02x, OUT %02x", input[i], output[i]);
- }
- return 1;
- }
- return 0;
-}
-
-int testReversedBitstream()
-{
- uint8_t input [] = {0xDE,0xAD,0xBE,0xEF,0xDE,0xAD,0xBE,0xEF};
- uint8_t reverse [] = {0,0,0,0,0,0,0,0};
- uint8_t output [] = {0,0,0,0,0,0,0,0};
- BitstreamIn in = { input, sizeof(input) * 8,0};
- BitstreamOut out ={ output, 0,0};
- BitstreamIn reversed_in ={ reverse, sizeof(input)*8,0};
- BitstreamOut reversed_out ={ reverse,0 ,0};
-
- while(bitsLeft(&in) > 0)
- {
- pushBit(&reversed_out, tailBit(&in));
- }
- while(bitsLeft(&reversed_in) > 0)
- {
- pushBit(&out, tailBit(&reversed_in));
- }
- if(memcmp(input, output, sizeof(input)) == 0)
- {
- prnlog(" Bitstream test 2 ok");
- }else
- {
- prnlog(" Bitstream test 2 failed");
- uint8_t i;
- for(i = 0 ; i < sizeof(input) ; i++)
- {
- prnlog(" IN %02x, MIDDLE: %02x, OUT %02x", input[i],reverse[i], output[i]);
- }
- return 1;
- }
- return 0;
-}
-
-
-int testCipherUtils(void)
-{
- prnlog("[+] Testing some internals...");
- int retval = 0;
- retval |= testBitStream();
- retval |= testReversedBitstream();
- return retval;
-}
-#endif
projects / proxmark3-svn / blobdiff