+//-----------------------------------------------------------------------------
+// This code is licensed to you under the terms of the GNU GPL, version 2 or,
+// at your option, any later version. See the LICENSE.txt file for the text of
+// the license.
+//-----------------------------------------------------------------------------
+// ISO14443 CRC calculation code.
+//-----------------------------------------------------------------------------
+
#include "iso14443crc.h"
static unsigned short UpdateCrc14443(unsigned char ch, unsigned short *lpwCrc)
}
void ComputeCrc14443(int CrcType,
- unsigned char *Data, int Length,
+ const unsigned char *Data, int Length,
unsigned char *TransmitFirst,
unsigned char *TransmitSecond)
{
*TransmitSecond = (unsigned char) ((wCrc >> 8) & 0xFF);
return;
}
+
+int CheckCrc14443(int CrcType, const unsigned char *Data, int Length) {
+ unsigned char b1;
+ unsigned char b2;
+ if (Length < 3) return 0;
+ ComputeCrc14443(CrcType, Data, Length - 2, &b1, &b2);
+ if ((b1 == Data[Length - 2]) && (b2 == Data[Length - 1])) return 1;
+ return 0;
+}