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src/core/operations/CompareCTPHHashes.mjs
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/**
* @author n1474335 [n1474335@gmail.com]
* @copyright Crown Copyright 2016
* @license Apache-2.0
*/
import Operation from "../Operation.mjs";
import Utils from "../Utils.mjs";
import {HASH_DELIM_OPTIONS} from "../lib/Delim.mjs";
import ctphjs from "ctph.js";
import OperationError from "../errors/OperationError.mjs";
/**
* Compare CTPH hashes operation
*/
class CompareCTPHHashes extends Operation {
/**
* CompareCTPHHashes constructor
*/
constructor() {
super();
this.name = "Compare CTPH hashes";
this.module = "Crypto";
this.description = "Compares two Context Triggered Piecewise Hashing (CTPH) fuzzy hashes to determine the similarity between them on a scale of 0 to 100.";
this.infoURL = "https://forensicswiki.org/wiki/Context_Triggered_Piecewise_Hashing";
this.inputType = "string";
this.outputType = "Number";
this.args = [
{
"name": "Delimiter",
"type": "option",
"value": HASH_DELIM_OPTIONS
}
];
}
/**
* @param {string} input
* @param {Object[]} args
* @returns {Number}
*/
run(input, args) {
const samples = input.split(Utils.charRep(args[0]));
if (samples.length !== 2) throw new OperationError("Incorrect number of samples.");
return ctphjs.similarity(samples[0], samples[1]);
}
}
export default CompareCTPHHashes;