Module agora.crypto.Crc16
Package crc16 is implementation according to CCITT standards.
Note by @antirez: this is actually the XMODEM CRC 16 algorithm, using the following parameters:
Name : "XMODEM", also known as "ZMODEM", "CRC-16/ACORN" Width : 16 bit Poly : 1021 (That is actually x^16 + x^12 + x^5 + 1) Initialization : 0000 Reflect Input byte : False Reflect Output CRC : False Xor constant to output CRC : 0000 Output for "123456789" : 31C3
ported from the Go code in the stellar/go codebase (https://github.com/stellar/go/).
Original file
https://github.com/stellar/go/blob/680340b409a03a6061ae445067453f582411deaf/crc16/main.go
The code is licensed as:
Copyright 2001-2010 Georges Menie (www.menie.org) Copyright 2010-2012 Salvatore Sanfilippo (adapted to Redis coding style) Copyright 2015 Stellar Development Foundation (ported to go) All rights reserved.
Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. * Neither the name of the University of California, Berkeley nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS AS IS'' AND ANY
EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE REGENTS AND CONTRIBUTORS BE LIABLE FOR ANY
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Functions
| Name | Description |
|---|---|
checksum(data)
|
Checksum returns the 2-byte checksum for the provided data Data returned is in little endian |
validate(data, expected)
|
Validate returns an error if the provided checksum does not match the calculated checksum of the provided data |