Code improved for less memory

[proxmark3-svn] / client / loclass / ikeys.c

diff --git a/client/loclass/ikeys.c b/client/loclass/ikeys.c
index f7115b1976280c3d204f388ff84a20198c9d975f..a40d563a5b2e6201877c8607c092085a929654c9 100644 (file)
--- a/client/loclass/ikeys.c
+++ b/client/loclass/ikeys.c
@@ -1,20 +1,28 @@
 /*****************************************************************************
- * This file is part of iClassCipher. It is a reconstructon of the cipher engine
+ * 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".
  *
- * 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.
+ * by the Free Software Foundation, or, at your option, any later version. 
  *
  * This file is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -22,8 +30,11 @@
  * 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/>.
+ * along with loclass.  If not, see <http://www.gnu.org/licenses/>.
+ * 
+ * 
  ****************************************************************************/
+
 /**
 
 
@@ -57,12 +68,12 @@ From "Dismantling iclass":
 #include <inttypes.h>
 #include "fileutils.h"
 #include "cipherutils.h"
-#include "des.h"
+#include "mbedtls/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 mbedtls_des_context ctx_enc = { {0} };
+static mbedtls_des_context ctx_dec = { {0} };
 
 static int debug_print = 0;
 
@@ -382,12 +393,12 @@ 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);
+       mbedtls_des_setkey_enc( &ctx_enc, key);
 
        uint8_t crypted_csn[8] = {0};
 
        // Calculate DES(CSN, KEY)
-       des_crypt_ecb(&ctx_enc,csn, crypted_csn);
+       mbedtls_des_crypt_ecb(&ctx_enc,csn, crypted_csn);
 
        //Calculate HASH0(DES))
     uint64_t crypt_csn = x_bytes_to_num(crypted_csn, 8);
@@ -455,13 +466,13 @@ typedef struct
 } Testcase;
 
 
-int testDES(Testcase testcase, des_context ctx_enc, des_context ctx_dec)
+int testDES(Testcase testcase, mbedtls_des_context ctx_enc, mbedtls_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);
+       int retval = mbedtls_des_crypt_ecb(&ctx_enc,testcase.uid,des_encrypted_csn);
+       retval |= mbedtls_des_crypt_ecb(&ctx_dec,des_encrypted_csn,decrypted);
 
        if(memcmp(testcase.uid,decrypted,8) != 0)
        {
@@ -667,7 +678,7 @@ int testDES2(uint64_t csn, uint64_t expected)
        print64bits("   csn ", csn);
     x_num_to_bytes(csn, 8,input);
 
-       des_crypt_ecb(&ctx_enc,input, result);
+       mbedtls_des_crypt_ecb(&ctx_enc,input, result);
 
     uint64_t crypt_csn = x_bytes_to_num(result, 8);
        print64bits("   {csn}    ", crypt_csn );
@@ -698,7 +709,7 @@ int doTestsWithKnownInputs()
        prnlog("[+] Testing foo");
        uint8_t key[8] = {0x6c,0x8d,0x44,0xf9,0x2a,0x2d,0x01,0xbf};
 
-       des_setkey_enc( &ctx_enc, key);
+       mbedtls_des_setkey_enc( &ctx_enc, key);
        testDES2(0xbbbbaaaabbbbeeee,0xd6ad3ca619659e6b);
 
        prnlog("[+] Testing hashing algorithm");
@@ -728,18 +739,16 @@ int readKeyFile(uint8_t key[8])
        FILE *f;
        int retval = 1;
        f = fopen("iclass_key.bin", "rb");
-       if (f)
-       {
-               if(fread(key, sizeof(uint8_t), 8, f) == 1) 
-               {
-                       retval = 0;     
-               }
-               fclose(f);
+       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;
@@ -767,8 +776,8 @@ int doKeyTests(uint8_t debuglevel)
 
                        prnlog("[+] Checking key parity...");
                        des_checkParity(key);
-                       des_setkey_enc( &ctx_enc, key);
-                       des_setkey_dec( &ctx_dec, 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();