Merge branch 'feature/crc-8-checksum' of https://github.com/MShwed/CyberChef into MShwed-feature/crc-8-checksum

src/core/config/Categories.json

@@ -316,6 +316,7 @@
             "Fletcher-32 Checksum",
             "Fletcher-64 Checksum",
             "Adler-32 Checksum",
+            "CRC-8 Checksum",
             "CRC-16 Checksum",
             "CRC-32 Checksum",
             "TCP/IP Checksum"

src/core/operations/CRC8Checksum.mjs

@@ -0,0 +1,156 @@
+/**
+ * @author mshwed [m@ttshwed.com]
+ * @copyright Crown Copyright 2019
+ * @license Apache-2.0
+ */
+
+import Operation from "../Operation";
+import OperationError from "../errors/OperationError";
+
+import { toHex } from "../lib/Hex";
+
+/**
+ * CRC-8 Checksum operation
+ */
+class CRC8Checksum extends Operation {
+
+    /**
+     * CRC8Checksum constructor
+     */
+    constructor() {
+        super();
+
+        this.name = "CRC-8 Checksum";
+        this.module = "Crypto";
+        this.description = "A cyclic redundancy check (CRC) is an error-detecting code commonly used in digital networks and storage devices to detect accidental changes to raw data.<br><br>The CRC was invented by W. Wesley Peterson in 1961.";
+        this.infoURL = "https://wikipedia.org/wiki/Cyclic_redundancy_check";
+        this.inputType = "ArrayBuffer";
+        this.outputType = "string";
+        this.args = [
+            {
+                "name": "Algorithm",
+                "type": "option",
+                "value": [
+                    "CRC-8",
+                    "CRC-8/CDMA2000",
+                    "CRC-8/DARC",
+                    "CRC-8/DVB-S2",
+                    "CRC-8/EBU",
+                    "CRC-8/I-CODE",
+                    "CRC-8/ITU",
+                    "CRC-8/MAXIM",
+                    "CRC-8/ROHC",
+                    "CRC-8/WCDMA"
+                ]
+            }
+        ];
+    }
+
+    /**
+     * Generates the pre-computed lookup table for byte division
+     *
+     * @param polynomial
+     */
+    calculateCRC8LookupTable(polynomial) {
+        const crc8Table = new Uint8Array(256);
+
+        let currentByte;
+        for (let i = 0; i < 256; i++) {
+            currentByte = i;
+            for (let bit = 0; bit < 8; bit++) {
+                if ((currentByte & 0x80) !== 0) {
+                    currentByte <<= 1;
+                    currentByte ^= polynomial;
+                } else {
+                    currentByte <<= 1;
+                }
+            }
+
+            crc8Table[i] = currentByte;
+        }
+
+        return crc8Table;
+    }
+
+    /**
+     * Calculates the CRC-8 Checksum from an input
+     *
+     * @param {ArrayBuffer} input
+     * @param {number} polynomial
+     * @param {number} initializationValue
+     * @param {boolean} inputReflection
+     * @param {boolean} outputReflection
+     * @param {number} xorOut
+     */
+    calculateCRC8(input, polynomial, initializationValue, inputReflection, outputReflection, xorOut) {
+        const crcSize = 8;
+        const crcTable = this.calculateCRC8LookupTable(polynomial);
+
+        let crc = initializationValue !== 0 ? initializationValue : 0;
+        let currentByte, position;
+
+        input = new Uint8Array(input);
+        for (const inputByte of input) {
+            currentByte = inputReflection ? this.reverseBits(inputByte, crcSize) : inputByte;
+
+            position = (currentByte ^ crc) & 255;
+            crc = crcTable[position];
+        }
+
+        crc = outputReflection ? this.reverseBits(crc, crcSize) : crc;
+
+        if (xorOut !== 0) crc = crc ^ xorOut;
+
+        return toHex(new Uint8Array([crc]));
+    }
+
+    /**
+     * Reverse the bits for a given input byte.
+     *
+     * @param {number} input
+     */
+    reverseBits(input, hashSize) {
+        let reversedByte = 0;
+        for (let i = hashSize - 1; i >= 0; i--) {
+            reversedByte |= ((input & 1) << i);
+            input >>= 1;
+        }
+
+        return reversedByte;
+    }
+
+    /**
+     * @param {ArrayBuffer} input
+     * @param {Object[]} args
+     * @returns {string}
+     */
+    run(input, args) {
+        const algorithm = args[0];
+
+        if (algorithm === "CRC-8") {
+            return this.calculateCRC8(input, 0x7, 0x0, false, false, 0x0);
+        } else if (algorithm === "CRC-8/CDMA2000") {
+            return this.calculateCRC8(input, 0x9B, 0xFF, false, false, 0x0);
+        } else if (algorithm === "CRC-8/DARC") {
+            return this.calculateCRC8(input, 0x39, 0x0, true, true, 0x0);
+        } else if (algorithm === "CRC-8/DVB-S2") {
+            return this.calculateCRC8(input, 0xD5, 0x0, false, false, 0x0);
+        } else if (algorithm === "CRC-8/EBU") {
+            return this.calculateCRC8(input, 0x1D, 0xFF, true, true, 0x0);
+        } else if (algorithm === "CRC-8/I-CODE") {
+            return this.calculateCRC8(input, 0x1D, 0xFD, false, false, 0x0);
+        } else if (algorithm === "CRC-8/ITU") {
+            return this.calculateCRC8(input, 0x7, 0x0, false, false, 0x55);
+        } else if (algorithm === "CRC-8/MAXIM") {
+            return this.calculateCRC8(input, 0x31, 0x0, true, true, 0x0);
+        } else if (algorithm === "CRC-8/ROHC") {
+            return this.calculateCRC8(input, 0x7, 0xFF, true, true, 0x0);
+        } else if (algorithm === "CRC-8/WCDMA") {
+            return this.calculateCRC8(input, 0x9B, 0x0, true, true, 0x0);
+        }
+
+        throw new OperationError("Unknown checksum algorithm");
+    }
+}
+
+export default CRC8Checksum;

tests/operations/tests/Checksum.mjs

@@ -29,6 +29,127 @@ const ALL_BYTES = [
 ].join("");
 
 TestRegister.addTests([
+    {
+        name: "CRC-8: nothing",
+        input: "",
+        expectedOutput: "00",
+        recipeConfig: [
+            {
+                "op": "CRC-8 Checksum",
+                "args": ["CRC-8"]
+            }
+        ]
+    },
+    {
+        name: "CRC-8: default check",
+        input: "123456789",
+        expectedOutput: "f4",
+        recipeConfig: [
+            {
+                "op": "CRC-8 Checksum",
+                "args": ["CRC-8"]
+            }
+        ]
+    },
+    {
+        name: "CRC-8: CDMA2000",
+        input: "123456789",
+        expectedOutput: "da",
+        recipeConfig: [
+            {
+                "op": "CRC-8 Checksum",
+                "args": ["CRC-8/CDMA2000"]
+            }
+        ]
+    },
+    {
+        name: "CRC-8: DARC",
+        input: "123456789",
+        expectedOutput: "15",
+        recipeConfig: [
+            {
+                "op": "CRC-8 Checksum",
+                "args": ["CRC-8/DARC"]
+            }
+        ]
+    },
+    {
+        name: "CRC-8: DVB-S2",
+        input: "123456789",
+        expectedOutput: "bc",
+        recipeConfig: [
+            {
+                "op": "CRC-8 Checksum",
+                "args": ["CRC-8/DVB-S2"]
+            }
+        ]
+    },
+    {
+        name: "CRC-8: EBU",
+        input: "123456789",
+        expectedOutput: "97",
+        recipeConfig: [
+            {
+                "op": "CRC-8 Checksum",
+                "args": ["CRC-8/EBU"]
+            }
+        ]
+    },
+    {
+        name: "CRC-8: I-CODE",
+        input: "123456789",
+        expectedOutput: "7e",
+        recipeConfig: [
+            {
+                "op": "CRC-8 Checksum",
+                "args": ["CRC-8/I-CODE"]
+            }
+        ]
+    },
+    {
+        name: "CRC-8: ITU",
+        input: "123456789",
+        expectedOutput: "a1",
+        recipeConfig: [
+            {
+                "op": "CRC-8 Checksum",
+                "args": ["CRC-8/ITU"]
+            }
+        ]
+    },
+    {
+        name: "CRC-8: MAXIM",
+        input: "123456789",
+        expectedOutput: "a1",
+        recipeConfig: [
+            {
+                "op": "CRC-8 Checksum",
+                "args": ["CRC-8/MAXIM"]
+            }
+        ]
+    },
+    {
+        name: "CRC-8: ROHC",
+        input: "123456789",
+        expectedOutput: "d0",
+        recipeConfig: [
+            {
+                "op": "CRC-8 Checksum",
+                "args": ["CRC-8/ROHC"]
+            }
+        ]
+    },
+    {
+        name: "CRC-8: WCDMA",
+        input: "123456789",
+        expectedOutput: "25",
+        recipeConfig: [
+            {
+                "op": "CRC-8 Checksum",
+                "args": ["CRC-8/WCDMA"]
+            }
+        ]
+    },
     {
         name: "CRC-16: nothing",
         input: "",
@@ -116,5 +237,5 @@ TestRegister.addTests([
                 "args": []
             }
         ]
-    },
+    }
 ]);