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+/**
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+ * @author h345983745
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+ * @copyright Crown Copyright 2019
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+ * @license Apache-2.0
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+ */
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+
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+import Operation from "../Operation";
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+import blakejs from "blakejs";
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+import OperationError from "../errors/OperationError";
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+import Utils from "../Utils";
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+import { toBase64 } from "../lib/Base64";
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+
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+/**
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+ * BLAKE2b operation
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+ */
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+class BLAKE2b extends Operation {
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+
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+ /**
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+ * BLAKE2b constructor
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+ */
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+ constructor() {
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+ super();
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+
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+ this.name = "BLAKE2b";
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+ this.module = "Hashing";
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+ this.description = `Performs BLAKE2b hashing on the input.
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+ <br><br> BLAKE2b is a flavour of the BLAKE cryptographic hash function that is optimized for 64-bit platforms and produces digests of any size between 1 and 64 bytes.
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+ <br><br> Supports the use of an optional key.`;
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+ this.infoURL = "https://wikipedia.org/wiki/BLAKE_(hash_function)#BLAKE2b_algorithm";
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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": "Size",
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+ "type": "option",
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+ "value": ["512", "384", "256", "160", "128"]
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+ }, {
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+ "name": "Output Encoding",
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+ "type": "option",
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+ "value": ["Hex", "Base64", "Raw"]
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+ }, {
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+ "name": "Key",
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+ "type": "toggleString",
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+ "value": "",
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+ "toggleValues": ["UTF8", "Decimal", "Base64", "Hex", "Latin1"]
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+ }
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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} The input having been hashed with BLAKE2b in the encoding format speicifed.
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+ */
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+ run(input, args) {
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+ const [outSize, outFormat] = args;
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+ let key = Utils.convertToByteArray(args[2].string || "", args[2].option);
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+ if (key.length === 0){
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+ key = null;
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+ } else if (key.length > 64){
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+ throw new OperationError(["Key cannot be greater than 64 bytes", "It is currently " + key.length + " bytes."].join("\n"));
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+ }
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+ switch (outFormat) {
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+ case "Hex":
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+ return blakejs.blake2bHex(input, key, outSize / 8);
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+ case "Base64":
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+ return toBase64(blakejs.blake2b(input, key, outSize / 8));
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+ case "Raw":
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+ return Utils.arrayBufferToStr(blakejs.blake2b(input, key, outSize / 8).buffer);
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+ default:
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+ return new OperationError("Unsupported Output Type");
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+ }
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+ }
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+
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+}
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+
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+export default BLAKE2b;
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