Added 'TLS JA3 Fingerprint' operation
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n1474335
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@ -193,6 +193,7 @@
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"Protobuf Decode",
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"VarInt Encode",
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"VarInt Decode",
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"TLS JA3 Fingerprint",
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"Format MAC addresses",
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"Change IP format",
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"Group IP addresses",
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198
src/core/operations/TLSJA3Fingerprint.mjs
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198
src/core/operations/TLSJA3Fingerprint.mjs
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@ -0,0 +1,198 @@
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/**
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* @author n1474335 [n1474335@gmail.com]
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* @copyright Crown Copyright 2021
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* @license Apache-2.0
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*/
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import Operation from "../Operation.mjs";
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import OperationError from "../errors/OperationError.mjs";
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import Utils from "../Utils.mjs";
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import Stream from "../lib/Stream.mjs";
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import {runHash} from "../lib/Hash.mjs";
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/**
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* TLS JA3 Fingerprint operation
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*/
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class TLSJA3Fingerprint extends Operation {
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/**
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* TLSJA3Fingerprint constructor
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*/
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constructor() {
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super();
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this.name = "TLS JA3 Fingerprint";
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this.module = "Crypto";
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this.description = "Generates a JA3 fingerprint to help identify TLS clients based on hashing together values from the Client Hello.<br><br>Input: A hex stream of the TLS Client Hello application layer.";
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this.infoURL = "https://engineering.salesforce.com/tls-fingerprinting-with-ja3-and-ja3s-247362855967";
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this.inputType = "string";
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this.outputType = "string";
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this.args = [
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{
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name: "Input format",
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type: "option",
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value: ["Hex", "Base64", "Raw"]
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},
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{
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name: "Output format",
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type: "option",
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value: ["Hash digest", "JA3 string", "Full details"]
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}
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];
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}
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/**
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* @param {string} input
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* @param {Object[]} args
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* @returns {string}
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*/
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run(input, args) {
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const [inputFormat, outputFormat] = args;
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input = Utils.convertToByteArray(input, inputFormat);
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const s = new Stream(new Uint8Array(input));
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const handshake = s.readInt(1);
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if (handshake !== 0x16)
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throw new OperationError("Not handshake data.");
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// Version
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s.moveForwardsBy(2);
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// Length
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const length = s.readInt(2);
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if (s.length !== length + 5)
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throw new OperationError("Incorrect handshake length.");
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// Handshake type
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const handshakeType = s.readInt(1);
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if (handshakeType !== 1)
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throw new OperationError("Not a Client Hello.");
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// Handshake length
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const handshakeLength = s.readInt(3);
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if (s.length !== handshakeLength + 9)
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throw new OperationError("Not enough data in Client Hello.");
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// Hello version
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const helloVersion = s.readInt(2);
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// Random
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s.moveForwardsBy(32);
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// Session ID
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const sessionIDLength = s.readInt(1);
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s.moveForwardsBy(sessionIDLength);
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// Cipher suites
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const cipherSuitesLength = s.readInt(2);
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const cipherSuites = s.getBytes(cipherSuitesLength);
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const cs = new Stream(cipherSuites);
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const cipherSegment = parseJA3Segment(cs, 2);
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// Compression Methods
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const compressionMethodsLength = s.readInt(1);
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s.moveForwardsBy(compressionMethodsLength);
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// Extensions
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const extensionsLength = s.readInt(2);
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const extensions = s.getBytes(extensionsLength);
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const es = new Stream(extensions);
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let ecsLen, ecs, ellipticCurves = "", ellipticCurvePointFormats = "";
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const exts = [];
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while (es.hasMore()) {
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const type = es.readInt(2);
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const length = es.readInt(2);
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switch (type) {
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case 0x0a: // Elliptic curves
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ecsLen = es.readInt(2);
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ecs = new Stream(es.getBytes(ecsLen));
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ellipticCurves = parseJA3Segment(ecs, 2);
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break;
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case 0x0b: // Elliptic curve point formats
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ecsLen = es.readInt(1);
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ecs = new Stream(es.getBytes(ecsLen));
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ellipticCurvePointFormats = parseJA3Segment(ecs, 1);
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break;
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default:
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es.moveForwardsBy(length);
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}
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if (!GREASE_CIPHERSUITES.includes(type))
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exts.push(type);
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}
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// Output
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const ja3 = [
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helloVersion.toString(),
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cipherSegment,
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exts.join("-"),
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ellipticCurves,
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ellipticCurvePointFormats
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];
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const ja3Str = ja3.join(",");
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const ja3Hash = runHash("md5", Utils.strToArrayBuffer(ja3Str));
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switch (outputFormat) {
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case "JA3 string":
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return ja3Str;
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case "Full details":
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return `Hash digest:
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${ja3Hash}
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Full JA3 string:
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${ja3Str}
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TLS Version:
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${helloVersion.toString()}
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Cipher Suites:
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${cipherSegment}
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Extensions:
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${exts.join("-")}
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Elliptic Curves:
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${ellipticCurves}
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Elliptic Curve Point Formats:
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${ellipticCurvePointFormats}`;
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case "Hash digest":
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default:
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return ja3Hash;
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}
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}
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}
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/**
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* Parses a JA3 segment, returning a "-" separated list
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*
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* @param {Stream} stream
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* @returns {string}
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*/
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function parseJA3Segment(stream, size=2) {
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const segment = [];
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while (stream.hasMore()) {
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const element = stream.readInt(size);
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if (!GREASE_CIPHERSUITES.includes(element))
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segment.push(element);
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}
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return segment.join("-");
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}
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const GREASE_CIPHERSUITES = [
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0x0a0a,
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0x1a1a,
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0x2a2a,
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0x3a3a,
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0x4a4a,
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0x5a5a,
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0x6a6a,
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0x7a7a,
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0x8a8a,
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0x9a9a,
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0xaaaa,
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0xbaba,
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0xcaca,
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0xdada,
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0xeaea,
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0xfafa
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];
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export default TLSJA3Fingerprint;
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@ -104,6 +104,7 @@ import "./tests/Unicode.mjs";
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import "./tests/RSA.mjs";
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import "./tests/CBOREncode.mjs";
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import "./tests/CBORDecode.mjs";
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import "./tests/TLSJA3Fingerprint.mjs";
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// Cannot test operations that use the File type yet
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55
tests/operations/tests/TLSJA3Fingerprint.mjs
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55
tests/operations/tests/TLSJA3Fingerprint.mjs
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@ -0,0 +1,55 @@
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/**
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* TLSJA3Fingerprint tests.
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*
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* @author n1474335 [n1474335@gmail.com]
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* @copyright Crown Copyright 2021
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* @license Apache-2.0
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*/
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import TestRegister from "../../lib/TestRegister.mjs";
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TestRegister.addTests([
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{
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name: "TLS JA3 Fingerprint: TLS 1.0",
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input: "16030100a4010000a00301543dd2dd48f517ca9a93b1e599f019fdece704a23e86c1dcac588427abbaddf200005cc014c00a0039003800880087c00fc00500350084c012c00800160013c00dc003000ac013c00900330032009a009900450044c00ec004002f009600410007c011c007c00cc002000500040015001200090014001100080006000300ff0100001b000b000403000102000a000600040018001700230000000f000101",
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expectedOutput: "503053a0c5b2bd9b9334bf7f3d3b8852",
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recipeConfig: [
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{
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"op": "TLS JA3 Fingerprint",
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"args": ["Hex", "Hash digest"]
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}
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],
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},
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{
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name: "TLS JA3 Fingerprint: TLS 1.1",
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input: "16030100a4010000a00302543dd2ed907e47d0086f34bee2c52dd6ccd8de63ba9387f5e810b09d9d49b38000005cc014c00a0039003800880087c00fc00500350084c012c00800160013c00dc003000ac013c00900330032009a009900450044c00ec004002f009600410007c011c007c00cc002000500040015001200090014001100080006000300ff0100001b000b000403000102000a000600040018001700230000000f000101",
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expectedOutput: "a314eb64cee6cb832aaaa372c8295bab",
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recipeConfig: [
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{
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"op": "TLS JA3 Fingerprint",
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"args": ["Hex", "Hash digest"]
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}
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],
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},
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{
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name: "TLS JA3 Fingerprint: TLS 1.2",
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input: "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",
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expectedOutput: "c1a36e1a870786cc75edddc0009eaf3a",
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recipeConfig: [
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{
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"op": "TLS JA3 Fingerprint",
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"args": ["Hex", "Hash digest"]
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}
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],
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},
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{
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name: "TLS JA3 Fingerprint: TLS 1.3",
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input: "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",
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expectedOutput: "4826a90ec2daf4f7b4b64cc1c8bd343b",
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recipeConfig: [
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{
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"op": "TLS JA3 Fingerprint",
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"args": ["Hex", "Hash digest"]
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}
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],
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},
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]);
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