mirror of https://github.com/gchq/CyberChef.git
Fixed linting issues and added CRC-8 tests
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mshwed
parent
bc1bd2427d
commit
44643c151a
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@ -28,28 +28,28 @@ class CRC8Checksum extends Operation {
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this.outputType = "string";
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this.args = [
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{
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"name": "Algorithm",
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"type": "option",
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"value": [
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"CRC-8",
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"CRC-8/CDMA2000",
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"CRC-8/DARC",
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"CRC-8/DVB-S2",
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"CRC-8/EBU",
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"CRC-8/I-CODE",
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"CRC-8/ITU",
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"CRC-8/MAXIM",
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"CRC-8/ROHC",
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"CRC-8/WCDMA"
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]
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"name": "Algorithm",
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"type": "option",
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"value": [
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"CRC-8",
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"CRC-8/CDMA2000",
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"CRC-8/DARC",
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"CRC-8/DVB-S2",
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"CRC-8/EBU",
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"CRC-8/I-CODE",
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"CRC-8/ITU",
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"CRC-8/MAXIM",
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"CRC-8/ROHC",
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"CRC-8/WCDMA"
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]
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}
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]
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];
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}
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/**
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* Generates the pre-computed lookup table for byte division
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*
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* @param polynomial
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* Generates the pre-computed lookup table for byte division
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*
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* @param polynomial
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*/
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calculateCRC8LookupTable(polynomial) {
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const crc8Table = new Uint8Array(256);
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@ -58,7 +58,7 @@ class CRC8Checksum extends Operation {
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for (let i = 0; i < 256; i++) {
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currentByte = i;
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for (let bit = 0; bit < 8; bit++) {
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if ((currentByte & 0x80) != 0) {
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if ((currentByte & 0x80) !== 0) {
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currentByte <<= 1;
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currentByte ^= polynomial;
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} else {
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@ -67,48 +67,47 @@ class CRC8Checksum extends Operation {
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}
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crc8Table[i] = currentByte;
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}
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}
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return crc8Table;
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}
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/**
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* Calculates the CRC-8 Checksum from an input
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*
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*
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* @param {ArrayBuffer} input
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* @param {number} polynomial
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* @param {number} initializationValue
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* @param {boolean} inputReflection
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* @param {boolean} outputReflection
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* @param {number} xorOut
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* @param {number} check
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*/
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calculateCRC8(input, polynomial, initializationValue, inputReflection, outputReflection, xorOut, check) {
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const crcSize = 8;
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calculateCRC8(input, polynomial, initializationValue, inputReflection, outputReflection, xorOut) {
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const crcSize = 8;
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const crcTable = this.calculateCRC8LookupTable(polynomial);
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let crc = initializationValue != 0 ? initializationValue : 0;
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let crc = initializationValue !== 0 ? initializationValue : 0;
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let currentByte, position;
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input = new Uint8Array(input);
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for (let inputByte of input) {
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for (const inputByte of input) {
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currentByte = inputReflection ? this.reverseBits(inputByte, crcSize) : inputByte;
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position = (currentByte ^ crc ) & 255;
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position = (currentByte ^ crc) & 255;
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crc = crcTable[position];
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}
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crc = outputReflection ? this.reverseBits(crc, crcSize) : crc;
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crc = outputReflection ? this.reverseBits(crc, crcSize) : crc;
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if (xorOut != 0) crc = crc ^ xorOut;
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if (xorOut !== 0) crc = crc ^ xorOut;
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return toHex(new Uint8Array([crc]));
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}
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/**
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* Reverse the bits for a given input byte.
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*
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* @param {number} input
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* Reverse the bits for a given input byte.
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*
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* @param {number} input
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*/
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reverseBits(input, hashSize) {
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let reversedByte = 0;
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@ -129,25 +128,25 @@ class CRC8Checksum extends Operation {
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const algorithm = args[0];
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if (algorithm === "CRC-8") {
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return this.calculateCRC8(input, 0x7, 0x0, false, false, 0x0, 0xF4);
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return this.calculateCRC8(input, 0x7, 0x0, false, false, 0x0);
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} else if (algorithm === "CRC-8/CDMA2000") {
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return this.calculateCRC8(input, 0x9B, 0xFF, false, false, 0x0, 0xDA);
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return this.calculateCRC8(input, 0x9B, 0xFF, false, false, 0x0);
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} else if (algorithm === "CRC-8/DARC") {
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return this.calculateCRC8(input, 0x39, 0x0, true, true, 0x0, 0x15);
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return this.calculateCRC8(input, 0x39, 0x0, true, true, 0x0);
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} else if (algorithm === "CRC-8/DVB-S2") {
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return this.calculateCRC8(input, 0xD5, 0x0, false, false, 0x0, 0xBC);
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return this.calculateCRC8(input, 0xD5, 0x0, false, false, 0x0);
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} else if (algorithm === "CRC-8/EBU") {
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return this.calculateCRC8(input, 0x1D, 0xFF, true, true, 0x0, 0x97);
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return this.calculateCRC8(input, 0x1D, 0xFF, true, true, 0x0);
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} else if (algorithm === "CRC-8/I-CODE") {
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return this.calculateCRC8(input, 0x1D, 0xFD, false, false, 0x0, 0x7E);
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return this.calculateCRC8(input, 0x1D, 0xFD, false, false, 0x0);
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} else if (algorithm === "CRC-8/ITU") {
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return this.calculateCRC8(input, 0x7, 0x0, false, false, 0x55, 0xA1);
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return this.calculateCRC8(input, 0x7, 0x0, false, false, 0x55);
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} else if (algorithm === "CRC-8/MAXIM") {
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return this.calculateCRC8(input, 0x31, 0x0, true, true, 0x0, 0xA1);
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return this.calculateCRC8(input, 0x31, 0x0, true, true, 0x0);
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} else if (algorithm === "CRC-8/ROHC") {
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return this.calculateCRC8(input, 0x7, 0xFF, true, true, 0x0, 0xD0);
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return this.calculateCRC8(input, 0x7, 0xFF, true, true, 0x0);
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} else if (algorithm === "CRC-8/WCDMA") {
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return this.calculateCRC8(input, 0x9B, 0x0, true, true, 0x0, 0x25);
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return this.calculateCRC8(input, 0x9B, 0x0, true, true, 0x0);
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}
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throw new OperationError("Unknown checksum algorithm");
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@ -29,6 +29,127 @@ const ALL_BYTES = [
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].join("");
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TestRegister.addTests([
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{
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name: "CRC-8: nothing",
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input: "",
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expectedOutput: "00",
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recipeConfig: [
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{
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"op": "CRC-8 Checksum",
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"args": ["CRC-8"]
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}
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]
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},
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{
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name: "CRC-8: default check",
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input: "123456789",
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expectedOutput: "f4",
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recipeConfig: [
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{
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"op": "CRC-8 Checksum",
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"args": ["CRC-8"]
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}
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]
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},
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{
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name: "CRC-8: CDMA2000",
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input: "123456789",
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expectedOutput: "da",
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recipeConfig: [
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{
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"op": "CRC-8 Checksum",
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"args": ["CRC-8/CDMA2000"]
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}
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]
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},
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{
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name: "CRC-8: DARC",
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input: "123456789",
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expectedOutput: "15",
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recipeConfig: [
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{
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"op": "CRC-8 Checksum",
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"args": ["CRC-8/DARC"]
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}
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]
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},
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{
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name: "CRC-8: DVB-S2",
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input: "123456789",
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expectedOutput: "bc",
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recipeConfig: [
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{
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"op": "CRC-8 Checksum",
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"args": ["CRC-8/DVB-S2"]
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}
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]
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},
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{
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name: "CRC-8: EBU",
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input: "123456789",
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expectedOutput: "97",
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recipeConfig: [
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{
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"op": "CRC-8 Checksum",
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"args": ["CRC-8/EBU"]
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}
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]
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},
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{
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name: "CRC-8: I-CODE",
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input: "123456789",
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expectedOutput: "7e",
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recipeConfig: [
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{
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"op": "CRC-8 Checksum",
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"args": ["CRC-8/I-CODE"]
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}
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]
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},
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{
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name: "CRC-8: ITU",
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input: "123456789",
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expectedOutput: "a1",
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recipeConfig: [
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{
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"op": "CRC-8 Checksum",
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"args": ["CRC-8/ITU"]
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}
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]
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},
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{
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name: "CRC-8: MAXIM",
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input: "123456789",
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expectedOutput: "a1",
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recipeConfig: [
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{
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"op": "CRC-8 Checksum",
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"args": ["CRC-8/MAXIM"]
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}
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]
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},
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{
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name: "CRC-8: ROHC",
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input: "123456789",
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expectedOutput: "d0",
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recipeConfig: [
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{
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"op": "CRC-8 Checksum",
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"args": ["CRC-8/ROHC"]
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}
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]
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},
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{
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name: "CRC-8: WCDMA",
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input: "123456789",
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expectedOutput: "25",
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recipeConfig: [
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{
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"op": "CRC-8 Checksum",
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"args": ["CRC-8/WCDMA"]
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}
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]
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},
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{
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name: "CRC-16: nothing",
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input: "",
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@ -116,5 +237,5 @@ TestRegister.addTests([
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"args": []
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}
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]
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},
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}
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]);
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