diff options
Diffstat (limited to 'wsutil')
-rw-r--r-- | wsutil/crc16.c | 8 | ||||
-rw-r--r-- | wsutil/crc16.h | 6 |
2 files changed, 14 insertions, 0 deletions
diff --git a/wsutil/crc16.c b/wsutil/crc16.c index 8febfa1c66..2ff576c200 100644 --- a/wsutil/crc16.c +++ b/wsutil/crc16.c @@ -346,6 +346,14 @@ guint16 crc16_ccitt_seed(const guint8 *buf, guint len, guint16 seed) ^ crc16_ccitt_xorout; } +/* ISO14443-3, section 6.2.4: For ISO14443-A, the polynomial 0x1021 is + used, the initial register value shall be 0x6363, the final register + value is not XORed with anything. */ +guint16 crc16_iso14443a(const guint8 *buf, guint len) +{ + return crc16_reflected(buf,len, 0x6363 ,crc16_ccitt_table_reverse); +} + guint16 crc16_0x5935(const guint8 *buf, guint32 len, guint16 seed) { return crc16_unreflected(buf, len, seed, crc16_precompiled_5935); diff --git a/wsutil/crc16.h b/wsutil/crc16.h index 151b3f210d..11616089cc 100644 --- a/wsutil/crc16.h +++ b/wsutil/crc16.h @@ -61,6 +61,12 @@ WS_DLL_PUBLIC guint16 crc16_x25_ccitt_seed(const guint8 *buf, guint len, guint16 @return The CRC16 CCITT checksum (using the given seed). */ WS_DLL_PUBLIC guint16 crc16_ccitt_seed(const guint8 *buf, guint len, guint16 seed); +/** Compute the 16bit CRC_A value of a buffer as defined in ISO14443-3. + @param buf The buffer containing the data. + @param len The number of bytes to include in the computation. + @return the CRC16 checksum for the buffer */ +WS_DLL_PUBLIC guint16 crc16_iso14443a(const guint8 *buf, guint len); + /** Calculates a CRC16 checksum for the given buffer with the polynom * 0x5935 using a precompiled CRC table * @param buf a pointer to a buffer of the given length |