NAME
hash_crc16 - 16 bit cyclic redundancy code
SYNOPSIS
int hash_crc16(string str, string extra...)
DESCRIPTION
Compute the 16 bit Cyclic Redundancy Code of the concatenation of all
string arguments, with polynomial:
X^16 + X^12 + X^5 + 1
CRC-16 is considered suitable for strings of up to a total of 4096
characters.