mifare client update
[proxmark3-svn] / common / crc16.c
1 unsigned short update_crc16( unsigned short crc, unsigned char c ) {
2 unsigned short i, v, tcrc = 0;
3
4 v = (crc ^ c) & 0xff;
5 for (i = 0; i < 8; i++) {
6 tcrc = ( (tcrc ^ v) & 1 ) ? ( tcrc >> 1 ) ^ 0x8408 : tcrc >> 1;
7 v >>= 1;
8 }
9
10 return ((crc >> 8) ^ tcrc)&0xffff;
11 }
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