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<h1 class="page-title">Source: operations/Checksum.js</h1>
<section>
<article>
<pre
class="sunlight-highlight-javascript linenums">/**
* Checksum operations.
*
* @author n1474335 [n1474335@gmail.com]
* @copyright Crown Copyright 2016
* @license Apache-2.0
*
* @namespace
*/
var Checksum = {
/**
* Fletcher-16 Checksum operation.
*
* @param {byte_array} input
* @param {Object[]} args
* @returns {string}
*/
run_fletcher16: function(input, args) {
var a = 0,
b = 0;
for (var i = 0; i &lt; input.length; i++) {
a = (a + input[i]) % 0xff;
b = (b + a) % 0xff;
}
return Utils.hex(((b &lt;&lt; 8) | a) >>> 0, 4);
},
/**
* Adler-32 Checksum operation.
*
* @param {byte_array} input
* @param {Object[]} args
* @returns {string}
*/
run_adler32: function(input, args) {
var MOD_ADLER = 65521,
a = 1,
b = 0;
for (var i = 0; i &lt; input.length; i++) {
a += input[i];
b += a;
}
a %= MOD_ADLER;
b %= MOD_ADLER;
return Utils.hex(((b &lt;&lt; 16) | a) >>> 0, 8);
},
/**
* CRC-32 Checksum operation.
*
* @param {byte_array} input
* @param {Object[]} args
* @returns {string}
*/
run_crc32: function(input, args) {
var crc_table = window.crc_table || (window.crc_table = Checksum._gen_crc_table()),
crc = 0 ^ (-1);
for (var i = 0; i &lt; input.length; i++) {
crc = (crc >>> 8) ^ crc_table[(crc ^ input[i]) &amp; 0xff];
}
return Utils.hex((crc ^ (-1)) >>> 0);
},
/**
* TCP/IP Checksum operation.
*
* @author GCHQ Contributor [1]
* @param {byte_array} input
* @param {Object[]} args
* @returns {string}
*
* @example
* // returns '3f2c'
* Checksum.run_tcp_ip([0x45,0x00,0x00,0x87,0xa3,0x1b,0x40,0x00,0x40,0x06,
* 0x00,0x00,0xac,0x11,0x00,0x04,0xac,0x11,0x00,0x03])
*
* // returns 'a249'
* Checksum.run_tcp_ip([0x45,0x00,0x01,0x11,0x3f,0x74,0x40,0x00,0x40,0x06,
* 0x00,0x00,0xac,0x11,0x00,0x03,0xac,0x11,0x00,0x04])
*/
run_tcp_ip: function(input, args) {
var csum = 0;
for (var i = 0; i &lt; input.length; i++) {
if(i % 2 === 0) {
csum += (input[i] &lt;&lt; 8);
} else {
csum += input[i];
}
}
csum = (csum >> 16) + (csum &amp; 0xffff);
return Utils.hex(0xffff - csum);
},
/**
* Generates a CRC table for use with CRC checksums.
*
* @private
* @returns {array}
*/
_gen_crc_table: function() {
var c,
crc_table = [];
for (var n = 0; n &lt; 256; n++) {
c = n;
for (var k = 0; k &lt; 8; k++) {
c = ((c &amp; 1) ? (0xEDB88320 ^ (c >>> 1)) : (c >>> 1));
}
crc_table[n] = c;
}
return crc_table;
},
};
</pre>
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